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EP3597362B1 - Compression spring grinding machine - Google Patents

Compression spring grinding machine Download PDF

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Publication number
EP3597362B1
EP3597362B1 EP18183775.8A EP18183775A EP3597362B1 EP 3597362 B1 EP3597362 B1 EP 3597362B1 EP 18183775 A EP18183775 A EP 18183775A EP 3597362 B1 EP3597362 B1 EP 3597362B1
Authority
EP
European Patent Office
Prior art keywords
grinding
grinding disk
sensor
spring end
grinding machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18183775.8A
Other languages
German (de)
French (fr)
Other versions
EP3597362A1 (en
Inventor
Gabriella Kunz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Officina Meccanica Domaso SpA
Original Assignee
Officina Meccanica Domaso SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Officina Meccanica Domaso SpA filed Critical Officina Meccanica Domaso SpA
Priority to EP23168245.1A priority Critical patent/EP4234162A1/en
Priority to EP18183775.8A priority patent/EP3597362B1/en
Publication of EP3597362A1 publication Critical patent/EP3597362A1/en
Application granted granted Critical
Publication of EP3597362B1 publication Critical patent/EP3597362B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
    • B24B7/167—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings end faces coil springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00—Other grinding machines or devices
    • B24B27/0069—Other grinding machines or devices with means for feeding the work-pieces to the grinding tool, e.g. turntables, transfer means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00—Other grinding machines or devices
    • B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/005—Feeding or manipulating devices specially adapted to grinding machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/006—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/10—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/14—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the temperature during grinding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/16—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings
    • B24B7/17—Single-purpose machines or devices for grinding end-faces, e.g. of gauges, rollers, nuts, piston rings for simultaneously grinding opposite and parallel end faces, e.g. double disc grinders

Definitions

  • the invention relates to a spring-end grinder according to the features of claim 1 and a method for controlling a spring-end grinder according to the features of claim 15.
  • EP 0 722 810 A1 discloses a spring end grinder with two rotatable loading plates and two grinding wheels, the axes of rotation of which are parallel to the axes of rotation of the loading plates. It is also described that the distance between the grinding wheels is changed for successive work steps up to the end of the grinding process.
  • the grinding process for grinding down spring ends requires a high level of know-how, in particular to prevent the springs from getting too hot in the grinding process. Excessive heat generation during the grinding process also damages the grinding wheels and other components of the spring end grinding machine, in particular a sliding plate used to transfer a loading plate.
  • the aforementioned prior art also proposes an improved flow of cooling air in this regard.
  • the present invention proposes a spring end grinder having the features of claim 1, a system for controlling a spring end grinder according to claim 12; and a method for controlling a spring end grinding machine according to the features of claim 15 and a computer-readable storage medium according to claim 17.
  • Advantageous developments are specified in the dependent claims.
  • Providing a sensor that is integrated in the grinding wheel makes it possible to monitor the grinding process even more precisely with regard to certain parameters, such as temperature and/or abrasion of the grinding wheel, and advantageously via the information obtained in this way For example, to have a direct effect on the grinding process itself, to store this information for the documentation of the grinding process or to provide this information for storage in a knowledge database and/or to take it into account in future grinding processes or to use it to improve a conventional spring end grinding machine, in particular a spring end grinding machine or to improvement of a conventional grinding wheel.
  • the sensor integrated in the grinding wheel can in particular be permanently connected to the grinding wheel, for example to the grinding body or the grinding layer.
  • the sensor rotates with the grinding wheel and can also be designed to be partially integrated into the grinding layer.
  • Grinding wheel information can relate to the grinding wheel (grinding wheel parameters), the workpieces (workpiece parameters) and/or the grinding process (grinding process parameters).
  • Stored data containing grinding wheel information may be referred to as grinding wheel data.
  • Stored grinding process data contain, in particular, grinding process parameters
  • stored workpiece data contain, in particular, workpiece parameters.
  • the transmission between the sensor and the processing unit takes place wirelessly and to this extent not wired.
  • at least two preferably electrical lines would be routed via a rotating or sliding contact over the shaft of the grinding wheel.
  • the at least two electrical lines can both take over the power supply and be used modulated for the data exchange.
  • the sensor it is also possible for the sensor to work via a self-sufficient power supply or for the power supply to be provided inductively according to the principle of a generator by the rotation of the grinding wheel.
  • the signal transmission between the sensor and the processing unit preferably takes place wirelessly, so that a one-way or bidirectional wireless communication is created between the sensor and the processing unit.
  • this control command can readjust or feed the grinding wheel or wheels, switch a flow of cooling liquid or a flow of cooling air on or off, increase or reduce the number of revolutions of the grinding wheels, move/move the loading plate (feed grinding), make an adjustment the speed of rotation of the loading plate (continuous grinding); adjustment of the tilting angle of the grinding wheels (through-feed grinding) or any other change in the grinding process.
  • the grinding wheel information includes a characteristic value for the type of grinding wheel.
  • a characteristic value for the type of grinding wheel In particular, an assignment of grinding wheel parameters that are specific to the grinding wheel in question is made possible via the characteristic value.
  • the grinding wheel information can also contain grinding wheel parameters that are specific to the respective grinding wheel.
  • the type of grinding wheel, the date of manufacture, a maximum usage date, a maximum abrasion, dimensions, a material and/or service life of the grinding wheel and/or other specific information or grinding wheel parameters can be contained in the grinding wheel information.
  • These specific grinding wheel parameters can be stored in the processing unit or called up via the processing unit.
  • the grinding wheel can, for example, comprise an RFID transponder, in which the characteristic value for the type of grinding wheel is encoded.
  • a sensor is designed as a thermocouple and/or a sensor is designed as an infrared sensor. More preferably, at least one pair of electrodes of the thermocouple or a light guide can be aligned in the essentially axial direction of the grinding wheel, in particular accommodated in this alignment in the grinding wheel body. Provision can be made for the electrodes to extend as far as the grinding surface and in this respect the electrodes also experience a physical change as a result of abrasion of the grinding layer, so that, for example, the resistance value that can be detected in this respect changes. In the case of a thermocouple, the pair of electrodes are made of different materials.
  • the electrodes of the thermocouple can be connected to an oscillating circuit, in particular due to a detected resonance signal of the oscillating circuit, an abrasion of the Grinding wheel can be determined.
  • the oscillating circuit can be integrated into evaluation electronics of the sensor.
  • the length of the electrodes particularly influences the oscillation behavior or resonance behavior of the oscillating circuit, which means that conclusions can be drawn about the (previous) abrasion of the grinding wheel.
  • the thermal radiation can be transmitted to a detection unit of the sensor by means of a light guide.
  • a sensor can include a piezoelectric element and can be designed in particular as an ultrasonic sensor.
  • a signal correlating with the abrasion can be determined with an ultrasonic sensor.
  • the senor can also be designed as a speed sensor or comprise a speed sensor.
  • the speed sensor can be designed, for example, as an acceleration sensor and/or as a Hall sensor for detecting the number of revolutions of the grinding wheel.
  • the accumulated number of revolutions of the grinding wheel can be regarded as a measure of the probable wear of the grinding wheel.
  • the senor can also detect an imbalance in the grinding wheel and in this respect can be designed as an acceleration sensor, for example.
  • an imbalance sensor can be integrated in the grinding wheel and/or in the spring-end grinding machine. The data recorded or derived from this can be created in the grinding wheel or the spring-end grinding machine or passed on externally, for example to an external server.
  • the grinding wheel can also have an evaluation unit that is designed to process sensor signals generated by the sensor that contain grinding wheel information, the evaluation unit being integrated in particular in a grinding wheel holder, preferably in the grinding wheel flange.
  • the evaluation unit includes, for example, evaluation electronics and can include an integrated circuit and/or a computing unit, preferably a microcontroller. If the signals generated by the sensor or sensors are provided in analog form, the evaluation unit can also have an analog-to-digital converter include. In this respect, the data provided by the sensor or sensors can be processed via the evaluation unit, and this processed data can be transmitted to the processing unit in particular via the transmission device. However, it is also possible to provide a memory unit for storing grinding wheel data in the grinding wheel, in which grinding wheel information is stored. Prepared grinding wheel information is preferably stored in this memory unit, so that this memory unit can also interact with the evaluation unit described above.
  • a data transmission interface can expediently be provided for reading out recorded grinding wheel data, in particular grinding wheel data records which describe the temporal progression of grinding wheel information.
  • grinding wheel data can include, for example, grinding wheel information about the previous operating time, grinding processes (programs) that have been carried out or planned, recorded temperature profiles, abrasion profiles or the like.
  • This memory unit can be integrated in the grinding wheel itself or on the spring-end grinding machine, or it can be provided entirely externally. It is also possible to store grinding wheel data in several storage locations or to carry out the storage selectively, depending on the type of grinding wheel data.
  • grinding wheel data can also include workpiece parameters (material, dimensions), in particular the material and dimensions of the springs, as well as the respective grinding process parameters (contact pressure, limit temperatures, grinding times, chronological progression of these parameters), so that the computing unit can, for example, use historical data for a current Grinding process suitable control commands generated and / or from current Grinding process parameters using the sensor data from the grinding wheel are used to calculate suitable control commands for the spring-end grinding machine, or these data are correlated and stored in the memory unit or units.
  • workpiece parameters material, dimensions
  • the material and dimensions of the springs as well as the respective grinding process parameters (contact pressure, limit temperatures, grinding times, chronological progression of these parameters)
  • the computing unit can, for example, use historical data for a current Grinding process suitable control commands generated and / or from current Grinding process parameters using the sensor data from the grinding wheel are used to calculate suitable control commands for the spring-end grinding machine, or these data are correlated and stored in the memory unit or units.
  • the transmission device comprises a transmitting unit connected to the sensor or sensors or the evaluation unit, in particular arranged in the grinding unit or the grinding wheel, and a receiving unit connected to the processing unit for contactless transmission of grinding wheel information.
  • the processing unit also interacts with a transmission unit that can transmit information to a reception unit that is integrated in the grinding unit or in the grinding wheel.
  • the wireless signal transmission can be based on analog signals.
  • digital signals can also be transmitted, for example according to the WLAN standard, the Bluetooth standard or a mobile radio standard.
  • the transmission device is designed to wirelessly transmit sensor signals detected by the sensor, which contain grinding wheel information, inductively, capacitively or in another suitable way to the processing unit, with the transmitter unit and receiver unit being in particular connected to the axis of rotation of the grinding wheel coaxial induction coils are formed.
  • a system for controlling a spring-end grinding machine having a spring-end grinding machine according to the present invention, a server having a memory unit for storing grinding wheel data containing grinding wheel information, at least one grinding machine communication device for communication between the spring-end grinding machine and the server , in particular via a wireless network connection and/or a server communication device for communication between the server and the spring-end grinding machine, in particular via a wireless network connection.
  • a network connection can be provided here, for example, by a cellular network or a LAN network or a WLAN network.
  • the system for controlling the grinding machine provides that the server communication device receives actual grinding wheel data from the grinding machine communication device or is designed to receive this data, with the server having a computing unit that is designed to do so, based on actual grinding wheel data received and target grinding wheel data stored on the server, in particular stored grinding process parameters and/or workpiece parameters, to calculate a control command for the spring-end grinding machine, with the server communication device being designed to send the control command to the grinding machine communication device.
  • the calculation of a control command includes the comparison of the received actual grinding wheel data with the stored target grinding wheel data.
  • the grinding process parameters can include, for example, the limit temperature for the spring ends and other grinding process parameters.
  • Workpiece parameters can include, for example, dimensions, material, wire gauge, or an identification number of the workpiece to be ground.
  • the system for controlling the grinding machine can also provide for a grinding machine communication device to be arranged in or on the grinding unit, in particular in or on the grinding wheel, and connected to the sensor and/or a grinding machine communication device to be connected to the processing unit.
  • a grinder communication device connected to the processing unit can be integrated into a control module of the spring-end grinder or arranged in a control cabinet of the spring-end grinder, i.e. in particular stationary relative to the (rotating) grinding wheel.
  • a computer-readable storage medium which contains instructions which cause at least one processor to implement a method according to the invention when the instructions are executed by the processor of the server or the spring-end grinding machine.
  • a computer-readable storage medium can be, for example, a mobile data carrier or a hard disk, which can be arranged in the spring-end grinding machine or an (external) server.
  • the spring end grinding machine 1 has two or more loading plates 10 formed on each of which a plurality of workpiece receiving openings 15 are formed in order to be able to hold coil springs 3 therein.
  • the loading plates 10 are eccentrically rotatable about the axis of rotation A on a turntable 17 in such a way that a loading plate 10 can introduce the springs via a sliding plate 16 between two spatially spaced sanding plates 13 .
  • the turntable 17 rotates about the axis of rotation C.
  • the grinding wheels 13 grind the ends of the helical springs plane, in particular plane-parallel, so that the helical springs are each provided with plane-parallel ends.
  • the grinding wheels rotate around the common axis of rotation B (infeed grinding) or around axes of rotation B that are slightly tilted relative to one another (throughfeed grinding).
  • the spring end grinding machine 1 is constructed essentially symmetrically to the axis M of symmetry.
  • At least one of the grinding wheels 13, preferably both grinding wheels, are designed according to the invention with at least one sensor 30 integrated therein.
  • One or more sensors 30 can be installed in the upper grinding wheel 13 (as in 1 and 2 shown) and / or in the lower grinding wheel 13 may be provided.
  • the sensor 30 detects both a temperature of the grinding wheel 13 on its grinding surface 131 facing the helical springs 3 and the respective abrasion of the grinding wheel 13.
  • separate sensors 30 can also be provided, which each provide grinding wheel information, e.g. a temperature or , a measure of wear.
  • the temperature of the grinding wheel 13 can be detected, for example, using a thermocouple.
  • the abrasion can also be detected via a resistance value of a conductor in the region of the sliding surface 131 that is also detected by the abrasion.
  • the measured values of the sensor(s) 30 are then fed to an evaluation unit 31 provided in the grinding wheel 13 and fed to a transmission unit 51 via a data management unit 43 integrated in the grinding wheel 13 .
  • the transmission unit 51 sends the grinding wheel data obtained via a wireless connection 53 to a receiving unit 52 which, in the present embodiment, is arranged on the stationary part of the spring-end grinding machine 1 (ie outside the rotating grinding unit 11).
  • the transmitting unit 51 integrated in the grinding wheel 13 and the receiving unit 52 implemented on the spring-end grinding machine 1 are components of a transmission device 50 which enables wireless communication via a wireless connection 53 between the grinding wheel 13 and Spring end grinding machine 1 allows.
  • the wireless communication can be unidirectional from the grinding wheel 13 to the spring end grinding machine 1 .
  • the communication is preferably bidirectional, so that data can also be transmitted from the spring-end grinding machine 1 to the grinding wheel 13 .
  • a memory unit 14 is preferably also implemented in the grinding wheel 13 .
  • the data recorded by the sensor(s) 30 can be stored in the memory unit 14 but also associated process parameters, which are transmitted back from the spring-end grinding machine 1 to the grinding wheel 13 via the transmission device 50 .
  • data that is or was recorded by the spring-end grinding machine can also be transmitted back to the grinding wheel 13, in particular information about the drive forces, speed values, imbalance values recorded in the spring-end grinding machine, etc.
  • the entire history of various grinding processes can be stored in the grinding wheel 13 , in which the grinding wheel 13 was used, including the coil springs processed in each case, the process parameters, including temperature profiles of grinding speeds, number of revolutions, number of treated springs, etc.
  • the data stored in the grinding wheel 13 enable precise documentation of the Grinding wheel carried out grinding work, from which insights into the further development of grinding wheels and / or spring end grinders can be drawn.
  • the data recorded by the sensor 30 integrated in the grinding wheel 13 can also be used to directly influence control commands for the respective grinding process.
  • the grinding wheel information received at the receiving unit 52 of the spring-end grinding machine 1 is forwarded to a processing unit of the spring-end grinding machine.
  • the processing unit 40 of the spring-end grinding machine 1 is directly integrated into it.
  • the processing unit 40 can also be provided externally.
  • the processing unit 40 includes, on the one hand, a storage unit 41 and, on the other hand, a computing unit 42 in order to calculate control commands for a specific grinding process.
  • the control commands for a specific grinding process also depend on the ones detected via the sensor 30 or the sensors 30 Grinding wheel data, in particular the temperature at the spring ends or on the grinding surface 131 and the current abrasion.
  • a system 100 with one or more spring-end grinding machines 1 and a server 2 spatially separate from a spring-end grinding machine 1 can be provided, on the data of the spring-end grinding machine 1, comprising data from the sensor 30 integrated in the grinding wheel 13 or from the sensor 30 integrated in the grinding wheel 13 Sensors 30 are supplied.
  • the server 2 comprises a server communication device 21 which is in a wireless connection 23 with a grinding machine communication device 12 which is implemented on the spring-end grinding machine.
  • the wireless connection 23 includes a bidirectional data communication, which can take place in particular on the basis of a mobile radio standard or a WLAN standard.
  • the spring-end grinding machine 1 has a wireless connection 23 to a server 2 via a WLAN or mobile network.
  • the communication is bidirectional in such a way that both data transmission from the spring-end grinding machine 1 to the external server 2 and communication from the external server 2 to the spring-end grinding machine 1 is enabled.
  • the server 2 includes a computing unit 22 and a storage unit 20.
  • the data recorded by the sensor 30 or the sensors 30 in the grinding wheel 13 or in the grinding wheels 13 can, if necessary, be correlated with the other data associated process data are stored and used for subsequent control or evaluation routines.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)

Description

Die Erfindung betrifft eine Federendenschleifmaschine, nach den Merkmalen des Anspruchs 1 sowie ein Verfahren zur Steuerung einer Federendenschleifmaschine nach den Merkmalen des Anspruchs 15.The invention relates to a spring-end grinder according to the features of claim 1 and a method for controlling a spring-end grinder according to the features of claim 15.

Federendenschleifmaschinen sind aus dem Stand der Technik hinlänglich bekannt.Spring end grinding machines are well known from the prior art.

Aus EP 0 722 810 A1 ist eine Federendenschleifmaschine mit zwei drehbaren Ladetellern und zwei Schleifscheiben bekannt, deren Drehachsen zu den Drehachsen der Ladeteller parallel sind. Außerdem wird beschrieben, dass der Abstand der Schleifscheiben für aufeinander folgende Arbeitsschritte bis zum Ende des Schleifprozesses verändert wird.Out of EP 0 722 810 A1 discloses a spring end grinder with two rotatable loading plates and two grinding wheels, the axes of rotation of which are parallel to the axes of rotation of the loading plates. It is also described that the distance between the grinding wheels is changed for successive work steps up to the end of the grinding process.

Es wird beispielsweise auf die EP 2 926 949 verwiesen. Der Schleifprozess zum Abschleifen von Federenden erfordert ein hohes Maß an Know-how, um insbesondere zu verhindern, dass die Federn im Schleifprozess zu heiß werden. Eine zu starke Wärmeentwicklung im Schleifprozess schadet darüber hinaus auch den Schleifscheiben sowie weiteren Komponenten der Federendenschleifmaschine, insbesondere einer für die Überführung eines Ladetellers eingesetzten Gleitplatte. Der vorgenannte Stand der Technik schlägt diesbezüglich auch einen verbesserten Kühlluftstrom vor.For example, it will refer to the EP 2 926 949 referred. The grinding process for grinding down spring ends requires a high level of know-how, in particular to prevent the springs from getting too hot in the grinding process. Excessive heat generation during the grinding process also damages the grinding wheels and other components of the spring end grinding machine, in particular a sliding plate used to transfer a loading plate. The aforementioned prior art also proposes an improved flow of cooling air in this regard.

Allgemein besteht jedoch der Wunsch, den Prozess des Abschleifens von Federenden innerhalb einer Federendenschleifmaschine noch genauer steuern bzw. überwachen zu können.In general, however, there is a desire to be able to more precisely control or monitor the process of grinding down spring ends within a spring end grinding machine.

Zur Lösung dieser Aufgabe schlägt die vorliegende Erfindung eine Federendenschleifmaschine mit den Merkmalen des Anspruchs 1, ein System zur Steuerung einer Federendenschleifmaschine nach Anspruch 12; sowie ein Verfahren zur Steuerung einer Federendenschleifmaschine nach den Merkmalen des Anspruchs 15 und ein Computer-lesbares Speichermedium gemäß Anspruch 17. vor. Vorteilhafte Weiterbildungen sind in den Unteransprüchen angegeben.To solve this object, the present invention proposes a spring end grinder having the features of claim 1, a system for controlling a spring end grinder according to claim 12; and a method for controlling a spring end grinding machine according to the features of claim 15 and a computer-readable storage medium according to claim 17. Advantageous developments are specified in the dependent claims.

Nach einem Kerngedanken der vorliegenden Erfindung wird eine Federendenschleifmaschine vorgeschlagen, umfassend:

  • mindestens einen um eine Drehachse drehbar gelagerten Ladeteller zur Bestückung mit Werkstücken, insbesondere Schraubenfedern;
  • eine Schleifeinheit mit mindestens einer um eine Drehachse drehbar gelagerten Schleifscheibe,
    wobei die Drehachse der Schleifscheibe im Wesentlichen parallel zur Drehachse des Ladetellers ist;
  • mindestens einen Sensor zur Erfassung von Schleifscheibeninformationen, insbesondere einer Temperatur und/oder eines Abriebmaßes der Schleifscheibe, wobei der Sensor in die Schleifscheibe integriert, insbesondere in der Schleifscheibe aufgenommen, ist;
  • eine Verarbeitungseinheit, die dazu ausgebildet ist, basierend auf an die Verarbeitungseinheit übertragenen Schleifscheibeninformationen einen Steuerbefehl zur Steuerung der Federendenschleifmaschine auszugeben;
  • eine Übertragungseinrichtung zur Übertragung von
    Schleifscheibeninformationen von dem Sensor an die Verarbeitungseinheit, wobei die Übertragungseinrichtung (50) zur drahtlosen bidirektionalen Datenkommunikation zwischen der Schleifscheibe (13) und der Verarbeitungseinheit (40) ausgebildet ist.
According to a core idea of the present invention, a spring end grinding machine is proposed, comprising:
  • at least one loading plate, mounted rotatably about an axis of rotation, for loading with workpieces, in particular coil springs;
  • a grinding unit with at least one grinding wheel mounted so that it can rotate about an axis of rotation,
    wherein the axis of rotation of the grinding wheel is substantially parallel to the axis of rotation of the loading plate;
  • at least one sensor for detecting grinding wheel information, in particular a temperature and/or a degree of abrasion of the grinding wheel, the sensor being integrated into the grinding wheel, in particular accommodated in the grinding wheel;
  • a processing unit configured to output a control command for controlling the spring end grinding machine based on grinding wheel information transmitted to the processing unit;
  • a transmission device for the transmission of
    Grinding wheel information from the sensor to the processing unit, the transmission device (50) being designed for wireless bidirectional data communication between the grinding wheel (13) and the processing unit (40).

Durch das Vorsehen eines Sensors, der in der Schleifscheibe integriert ist, wird es ermöglicht, den Schleifprozess hinsichtlich bestimmter Parameter, wie beispielsweise Temperatur- und/oder Abrieb der Schleifscheibe noch genauer zu überwachen und vorteilhafterweise über die so gewonnenen Informationen beispielsweise auf den Schleifprozess selbst unmittelbar einzuwirken, diese Informationen zur Dokumentation des Schleifprozesses zu speichern bzw. diese Informationen zur Ablage in einer Knowledge-Datenbank bereitzustellen und/oder in künftigen Schleifprozessen zu berücksichtigen bzw. zur Verbesserung einer herkömmlichen Federendenschleifmaschine, insbesondere Federendenschleifmaschine heranzuziehen bzw. zur Verbesserung einer herkömmlichen Schleifscheibe heranzuziehen.Providing a sensor that is integrated in the grinding wheel makes it possible to monitor the grinding process even more precisely with regard to certain parameters, such as temperature and/or abrasion of the grinding wheel, and advantageously via the information obtained in this way For example, to have a direct effect on the grinding process itself, to store this information for the documentation of the grinding process or to provide this information for storage in a knowledge database and/or to take it into account in future grinding processes or to use it to improve a conventional spring end grinding machine, in particular a spring end grinding machine or to improvement of a conventional grinding wheel.

Der in der Schleifscheibe integrierte Sensor kann insbesondere fest mit der Schleifscheibe, beispielsweise mit dem Schleifgrundkörper oder dem Schleifbelag, fest verbunden sein. In jedem Fall rotiert der Sensor mit der Schleifscheibe mit und kann auch insbesondere teilweise, in den Schleifbelag integriert ausgebildet sein.The sensor integrated in the grinding wheel can in particular be permanently connected to the grinding wheel, for example to the grinding body or the grinding layer. In any case, the sensor rotates with the grinding wheel and can also be designed to be partially integrated into the grinding layer.

Schleifscheibeninformationen können die Schleifscheibe (Schleifscheibenparameter), die Werkstücke (Werkstückparameter) und/oder den Schleifprozess (Schleifprozessparameter) betreffen. Gespeicherte Daten, die Schleifscheibeninformationen enthalten, können als Schleifscheibendaten bezeichnet werden. Gespeicherte Schleifprozessdaten enthalten insbesondere Schleifprozessparameter, während gespeicherte Werkstückdaten insbesondere Werkstückparameter enthalten.Grinding wheel information can relate to the grinding wheel (grinding wheel parameters), the workpieces (workpiece parameters) and/or the grinding process (grinding process parameters). Stored data containing grinding wheel information may be referred to as grinding wheel data. Stored grinding process data contain, in particular, grinding process parameters, while stored workpiece data contain, in particular, workpiece parameters.

Die Übertragung zwischen dem Sensor und der Verarbeitungseinheit, die auch als Datenverarbeitungseinheit bezeichnet werden kann, erfolgt drahtlos und insofern nicht leitungsgebunden. Im letztgenannten Fall wären mindestens zwei vorzugsweise elektrische Leitungen über einen Rotations- bzw. Schleifkontakt über die Welle der Schleifscheibe geführt. Die mindestens zwei elektrischen Leitungen können dabei sowohl die Stromversorgung übernehmen als auch aufmoduliert für den Datenaustausch herangezogen werden. Es ist allerdings auch möglich, dass der Sensor über eine autarke Stromversorgung arbeitet bzw. die Stromversorgung induktiv nach dem Prinzip eines Generators durch die Rotation der Schleifscheibe bereitgestellt wird. Bevorzugtermaßen erfolgt die Signalübertragung zwischen Sensor und Verarbeitungseinheit allerdings drahtlos, so dass eine ein- oder bidirektionale drahtlose Kommunikation zwischen Sensor und Verarbeitungseinheit geschaffen ist. Sofern die übertragenen Schleifscheibeninformationen dazu genutzt werden, im laufenden Prozess einen Steuerbefehl zur Steuerung der Federendenschleifmaschine zu erzeugen bzw. zu beeinflussen, so kann dieser Steuerbefehl ein Nachjustieren oder Zustellen der Schleifscheibe bzw. der Schleifscheiben, ein Ein- oder Ausschalten eines Kühlflüssigkeitsstroms oder eines Kühlluftstroms, eine Erhöhung oder Reduktion der Umdrehungszahl der Schleifscheiben, eine Bewegung/ein Verfahren des Ladetellers (Zustellschleifen), eine Anpassung der Drehgeschwindigkeit des Ladetellers (Durchlaufschleifen); ein Einstellen des Kippwinkels der Schleifscheiben (Durchlaufschleifen) oder eine andere Veränderung des Schleifprozesses bewirken.The transmission between the sensor and the processing unit, which can also be referred to as a data processing unit, takes place wirelessly and to this extent not wired. In the latter case, at least two preferably electrical lines would be routed via a rotating or sliding contact over the shaft of the grinding wheel. The at least two electrical lines can both take over the power supply and be used modulated for the data exchange. However, it is also possible for the sensor to work via a self-sufficient power supply or for the power supply to be provided inductively according to the principle of a generator by the rotation of the grinding wheel. However, the signal transmission between the sensor and the processing unit preferably takes place wirelessly, so that a one-way or bidirectional wireless communication is created between the sensor and the processing unit. If the transmitted grinding wheel information is used to generate or to generate a control command for controlling the spring end grinding machine during the ongoing process influence, this control command can readjust or feed the grinding wheel or wheels, switch a flow of cooling liquid or a flow of cooling air on or off, increase or reduce the number of revolutions of the grinding wheels, move/move the loading plate (feed grinding), make an adjustment the speed of rotation of the loading plate (continuous grinding); adjustment of the tilting angle of the grinding wheels (through-feed grinding) or any other change in the grinding process.

In einer bevorzugten Weiterbildung ist vorgesehen, dass die Schleifscheibeninformationen einen Kennwert für den Typ der Schleifscheibe umfassen. Insbesondere wird über den Kennwert eine Zuordnung von Schleifscheibenparametern, die für die betreffende Schleifscheibe spezifisch sind, ermöglicht. Die Schleifscheibeninformationen können alternativ oder zusätzlich auch Schleifscheibenparameter enthalten, die spezifisch für die jeweilige Schleifscheibe sind. Beispielsweise kann der Typ der Schleifscheibe, das Fabrikationsdatum, ein maximales Verwendungsdatum, ein maximaler Abrieb, Abmessungen, ein Material und/oder Standzeiten der Schleifscheibe und/oder andere spezifische Informationen bzw. Schleifscheibenparameter in den Schleifscheibeninformationen enthalten sein. Diese spezifischen Schleifscheibenparameter können in der Verarbeitungseinheit hinterlegt sein bzw. über die Verarbeitungseinheit abgerufen werden. Die Schleifscheibe kann insofern beispielsweise einen RFID-Transponder umfassen, in dem der Kennwert für den Typ der Schleifscheibe kodiert ist.In a preferred development, it is provided that the grinding wheel information includes a characteristic value for the type of grinding wheel. In particular, an assignment of grinding wheel parameters that are specific to the grinding wheel in question is made possible via the characteristic value. Alternatively or additionally, the grinding wheel information can also contain grinding wheel parameters that are specific to the respective grinding wheel. For example, the type of grinding wheel, the date of manufacture, a maximum usage date, a maximum abrasion, dimensions, a material and/or service life of the grinding wheel and/or other specific information or grinding wheel parameters can be contained in the grinding wheel information. These specific grinding wheel parameters can be stored in the processing unit or called up via the processing unit. In this respect, the grinding wheel can, for example, comprise an RFID transponder, in which the characteristic value for the type of grinding wheel is encoded.

In einer bevorzugten Ausgestaltung ist ein Sensor als Thermoelement und/oder ein Sensor als Infrarotsensor ausgebildet. Weiter vorzugsweise kann mindestens ein Elektrodenpaar des Thermoelements bzw. ein Lichtleiter in im Wesentlichen axialer Richtung der Schleifscheibe ausgerichtet, insbesondere in dieser Ausrichtung in den Schleifscheibenkörper aufgenommen sein. Es kann vorgesehen sein, dass sich die Elektroden bis zur Schleiffläche erstrecken und insofern über einen Abrieb des Schleifbelages auch die Elektroden eine physische Veränderung erfahren, so dass sich beispielsweise der Widerstandswert, der insofern erfasst werden kann, verändert. Im Fall eines Thermoelements ist das Elektrodenpaar aus unterschiedlichen Materialien gebildet. Die Elektroden des Thermoelements können an einen Schwingkreis angeschlossen sein, wobei insbesondere aufgrund eines erfassten Resonanzsignals des Schwingkreises ein Abriebmaß der Schleifscheibe ermittelbar ist. Insbesondere kann der Schwingkreis in eine Auswerteelektronik des Sensors integriert sein. Die Länge der (sich über die Schleifdauer abschleifenden) Elektroden beeinflusst insbesondere das Schwingungsverhalten bzw. Resonanzverhalten des Schwingkreises, wodurch auf den (bisherigen) Abrieb der Schleifscheibe rückgeschlossen werden kann. Mittels eines Lichtleiters lässt sich insbesondere die Wärmestrahlung an eine Erfassungseinheit des Sensors übertragen.In a preferred embodiment, a sensor is designed as a thermocouple and/or a sensor is designed as an infrared sensor. More preferably, at least one pair of electrodes of the thermocouple or a light guide can be aligned in the essentially axial direction of the grinding wheel, in particular accommodated in this alignment in the grinding wheel body. Provision can be made for the electrodes to extend as far as the grinding surface and in this respect the electrodes also experience a physical change as a result of abrasion of the grinding layer, so that, for example, the resistance value that can be detected in this respect changes. In the case of a thermocouple, the pair of electrodes are made of different materials. The electrodes of the thermocouple can be connected to an oscillating circuit, in particular due to a detected resonance signal of the oscillating circuit, an abrasion of the Grinding wheel can be determined. In particular, the oscillating circuit can be integrated into evaluation electronics of the sensor. The length of the electrodes (which wear down over the grinding period) particularly influences the oscillation behavior or resonance behavior of the oscillating circuit, which means that conclusions can be drawn about the (previous) abrasion of the grinding wheel. In particular, the thermal radiation can be transmitted to a detection unit of the sensor by means of a light guide.

In einer möglichen Ausgestaltung kann ein Sensor ein piezoelektrisches Element umfassen und insbesondere als ein Ultraschallsensor ausgebildet sein. Mit einem Ultraschallsensor lässt sich ein mit dem Abrieb korrelierendes Signal ermitteln.In one possible configuration, a sensor can include a piezoelectric element and can be designed in particular as an ultrasonic sensor. A signal correlating with the abrasion can be determined with an ultrasonic sensor.

Ferner kann der Sensor auch als Drehzahlsensor ausgebildet sein bzw. einen Drehzahlsensor umfassen. In diesem Fall kann der Drehzahlsensor beispielsweise als Beschleunigungssensor und/oder als Hall-Sensor zur Erfassung der Umdrehungszahl der Schleifscheibe ausgebildet sein. Insbesondere kann die akkumulierte Umdrehungszahl der Schleifscheibe als ein Maß für den mutmaßlichen Verschleiß der Schleifscheibe angesehen werden.Furthermore, the sensor can also be designed as a speed sensor or comprise a speed sensor. In this case, the speed sensor can be designed, for example, as an acceleration sensor and/or as a Hall sensor for detecting the number of revolutions of the grinding wheel. In particular, the accumulated number of revolutions of the grinding wheel can be regarded as a measure of the probable wear of the grinding wheel.

Ferner kann der Sensor auch eine Unwucht der Schleifscheibe erfassen und insofern beispielsweise als Beschleunigungssensor ausgebildet sein. Ein derartiger Umwuchtsensor kann in der Schleifscheibe und/oder in der Federendenschleifmaschine integriert ausgebildet sein. Die erfassten oder hieraus abgeleiteten Daten können in der Schleifscheibe oder der Federendenschleifmaschine angelegt oder nach extern, beispielsweise an einen externen Server, weitergegeben werden.Furthermore, the sensor can also detect an imbalance in the grinding wheel and in this respect can be designed as an acceleration sensor, for example. Such an imbalance sensor can be integrated in the grinding wheel and/or in the spring-end grinding machine. The data recorded or derived from this can be created in the grinding wheel or the spring-end grinding machine or passed on externally, for example to an external server.

In einer bevorzugten Weiterbildung kann die Schleifscheibe auch eine Auswerteeinheit aufweisen, die dazu ausgebildet ist, vom Sensor erzeugte Sensorsignale, die Schleifscheibeninformationen enthalten, zu verarbeiten, wobei die Auswerteeinheit insbesondere in einer Schleifscheibenhalterung, vorzugsweise in den Schleifscheibenflansch integriert ist.In a preferred development, the grinding wheel can also have an evaluation unit that is designed to process sensor signals generated by the sensor that contain grinding wheel information, the evaluation unit being integrated in particular in a grinding wheel holder, preferably in the grinding wheel flange.

Die Auswerteeinheit umfasst beispielsweise eine Auswerteelektronik und kann einen integrierten Schaltkreis und/oder eine Recheneinheit, vorzugsweise einen Mikrocontroller umfassen. Werden die von dem oder den Sensoren erzeugten Signale analog bereitgestellt, kann die Auswerteeinheit auch einen Analog-DigitalWandler umfassen. Insofern kann über die Auswerteeinheit eine Aufbereitung von dem oder den Sensoren bereitgestellten Daten vorgenommen werden, und diese aufbereiteten Daten können insbesondere über die Übertragungseinrichtung an die Verarbeitungseinheit übertragen werden. Es ist aber auch möglich, in der Schleifscheibe eine Speichereinheit zur Speicherung von Schleifscheibendaten vorzusehen, in die Schleifscheibeninformationen abgelegt werden. Bevorzugtermaßen werden in dieser Speichereinheit aufbereitete Schleifscheibeninformationen abgelegt, so dass diese Speichereinheit auch mit der vorbeschriebenen Auswerteeinheit zusammenwirken kann.The evaluation unit includes, for example, evaluation electronics and can include an integrated circuit and/or a computing unit, preferably a microcontroller. If the signals generated by the sensor or sensors are provided in analog form, the evaluation unit can also have an analog-to-digital converter include. In this respect, the data provided by the sensor or sensors can be processed via the evaluation unit, and this processed data can be transmitted to the processing unit in particular via the transmission device. However, it is also possible to provide a memory unit for storing grinding wheel data in the grinding wheel, in which grinding wheel information is stored. Prepared grinding wheel information is preferably stored in this memory unit, so that this memory unit can also interact with the evaluation unit described above.

Ferner kann zweckmäßigerweise eine Datenübertragungsschnittstelle vorgesehen sein, zum Auslesen von aufgezeichneten Schleifscheibendaten, insbesondere von Schleifscheibendatensätzen, die zeitliche Verläufe von Schleifscheibeninformationen beschreiben. Derartige Schleifscheibendaten können beispielsweise Schleifscheibeninformationen über die bisherige Betriebszeit, durchgeführte oder geplante Schleifabläufe (-programme), aufgezeichnete Temperaturverläufe, Abriebverläufe o.ä. umfassen.Furthermore, a data transmission interface can expediently be provided for reading out recorded grinding wheel data, in particular grinding wheel data records which describe the temporal progression of grinding wheel information. Such grinding wheel data can include, for example, grinding wheel information about the previous operating time, grinding processes (programs) that have been carried out or planned, recorded temperature profiles, abrasion profiles or the like.

Es kann weiterhin vorgesehen sein, dass die Verarbeitungseinheit mit einer Speichereinheit zur Speicherung von Schleifscheibendaten, die Schleifscheibeninformationen enthalten, zusammenwirkt und ferner auch mit einer Recheneinheit zusammenwirkt, die dazu ausgebildet ist, basierend auf Ist-Schleifscheibendaten und in der Speichereinheit gespeicherten Soll-Schleifscheibendaten, insbesondere gespeicherten Schleifprozessparametern und/oder Werkstückparametern, einen Steuerbefehl für die Federendenschleifmaschine zu berechnen. Diese Speichereinheit kann in der Schleifscheibe selbst oder an der Federendenschleifmaschine integriert oder gänzlich extern vorgesehen sein. Es ist auch möglich, Schleifscheibendaten an mehreren Speicherorten abzuspeichern bzw. die Abspeicherung selektiv, je nach Art der Schleifscheibendaten vorzunehmen.Provision can also be made for the processing unit to interact with a storage unit for storing grinding wheel data containing grinding wheel information, and also with a computing unit which is designed to work based on actual grinding wheel data and target grinding wheel data stored in the storage unit, in particular stored grinding process parameters and/or workpiece parameters to calculate a control command for the spring end grinding machine. This memory unit can be integrated in the grinding wheel itself or on the spring-end grinding machine, or it can be provided entirely externally. It is also possible to store grinding wheel data in several storage locations or to carry out the storage selectively, depending on the type of grinding wheel data.

Schleifscheibendaten können - wie bereits erwähnt -auch Werkstückparameter (Material, Abmessungen), insbesondere Material und Abmessungen der Federn sowie jeweilige Schleifprozessparameter (Anpressdruck, Grenztemperaturen, Schleifdauern, zeitliche Verläufe dieser Parameter) mit umfassen, so dass die Recheneinheit beispielsweise aus historischen Daten für einen aktuellen Schleifprozess geeignete Steuerbefehle erzeugt und/oder aus aktuellen Schleifprozessparametern unter Nutzung der Sensordaten aus der Schleifscheibe geeignete Steuerbefehle für die Federendenschleifmaschine berechnet bzw. diese Daten entsprechend korreliert in der oder den Speichereinheiten abgelegt werden..As already mentioned, grinding wheel data can also include workpiece parameters (material, dimensions), in particular the material and dimensions of the springs, as well as the respective grinding process parameters (contact pressure, limit temperatures, grinding times, chronological progression of these parameters), so that the computing unit can, for example, use historical data for a current Grinding process suitable control commands generated and / or from current Grinding process parameters using the sensor data from the grinding wheel are used to calculate suitable control commands for the spring-end grinding machine, or these data are correlated and stored in the memory unit or units.

In einer bevorzugten Ausgestaltung umfasst die Übertragungseinrichtung eine mit dem oder den Sensoren bzw. der Auswerteeinheit verbundene, insbesondere in der Schleifeinheit bzw. der Schleifscheibe angeordnete Sendeeinheit und eine mit der Verarbeitungseinheit verbundene Empfangseinheit zur berührungslosen Übertragung von Schleifscheibeninformationen.In a preferred embodiment, the transmission device comprises a transmitting unit connected to the sensor or sensors or the evaluation unit, in particular arranged in the grinding unit or the grinding wheel, and a receiving unit connected to the processing unit for contactless transmission of grinding wheel information.

Um die Datenübertragung auch bidirektional zu ermöglichen, ist bevorzugtermaßen vorgesehen, dass auch die Verarbeitungseinheit mit einer Sendeeinheit zusammenwirkt, die Informationen an eine in der Schleifeinheit bzw. in der Schleifscheibe integrierte Empfangseinheit übermitteln kann. Die drahtlose Signalübertragung kann dabei auf analogen Signalen basieren. Es können aber auch digitale Signale beispielsweise nach dem WLAN-Standard, dem Bluetooth-Standard oder einem Mobilfunk-Standard übertragen werden.In order to enable bidirectional data transmission as well, it is preferably provided that the processing unit also interacts with a transmission unit that can transmit information to a reception unit that is integrated in the grinding unit or in the grinding wheel. The wireless signal transmission can be based on analog signals. However, digital signals can also be transmitted, for example according to the WLAN standard, the Bluetooth standard or a mobile radio standard.

In einer konkreten Ausgestaltung kann vorgesehen sein, dass die Übertragungseinrichtung dazu ausgebildet ist, vom Sensor erfasste Sensorsignale, die Schleifscheibeninformationen enthalten, induktiv, kapazitativ oder auf andere geeignete Weise drahtlos an die Verarbeitungseinheit zu übertragen, wobei Sendeeinheit und Empfangseinheit insbesondere als mit der Drehachse der Schleifscheibe koaxiale Induktionsspulen ausgebildet sind.In a specific embodiment, it can be provided that the transmission device is designed to wirelessly transmit sensor signals detected by the sensor, which contain grinding wheel information, inductively, capacitively or in another suitable way to the processing unit, with the transmitter unit and receiver unit being in particular connected to the axis of rotation of the grinding wheel coaxial induction coils are formed.

Es wird schließlich noch ein System zur Steuerung einer Federendenschleifmaschine beansprucht, wobei das System eine Federendenschleifmaschine nach der vorliegenden Erfindung, einen Server, der eine Speichereinheit zur Speicherung von Schleifscheibendaten aufweist, die Schleifscheibeninformationen enthalten, mindestens eine Schleifmaschinen-Kommunikationseinrichtung zur Kommunikation der Federendenschleifmaschine mit dem Server, insbesondere über eine drahtlose Netzwerkverbindung und/oder eine Server-Kommunikationseinrichtung zur Kommunikation des Servers mit der Federendenschleifmaschine, insbesondere über eine drahtlose Netzverbindung umfasst. Eine Netzverbindung kann hier beispielsweise durch ein Mobilfunknetz oder ein LAN-Netz bzw. ein WLAN-Netz bereitgestellt werden.Finally, a system for controlling a spring-end grinding machine is also claimed, the system having a spring-end grinding machine according to the present invention, a server having a memory unit for storing grinding wheel data containing grinding wheel information, at least one grinding machine communication device for communication between the spring-end grinding machine and the server , in particular via a wireless network connection and/or a server communication device for communication between the server and the spring-end grinding machine, in particular via a wireless network connection. A network connection can be provided here, for example, by a cellular network or a LAN network or a WLAN network.

In einer bevorzugten Ausgestaltung sieht das System zur Schleifmaschinensteuerung vor, dass die Server-Kommunikationseinrichtung Ist-Schleifscheibendaten von der Schleifmaschinen-Kommunikationseinrichtung empfängt bzw. dazu ausgebildet ist, diese Daten zu empfangen, wobei der Server eine Recheneinheit aufweist, die dazu ausgebildet ist, basierend auf empfangenen Ist-Schleifscheibendaten und auf dem Server gespeicherten Soll-Schleifscheibendaten, insbesondere gespeicherten Schleifprozessparametern und/oder Werkstückparametern, einen Steuerbefehl für die Federendenschleifmaschine zu berechnen, wobei die Server-Kommunikationseinrichtung dazu ausgebildet ist, den Steuerbefehl an die Schleifmaschinen-Kommunikationseinrichtung zu senden. Das Berechnen eines Steuerbefehls umfasst insofern den Vergleich der empfangenen Ist-Schleifscheibendaten mit den gespeicherten Soll-Schleifscheibendaten. Die Schleifprozessparameter können beispielsweise die Grenztemperatur für die Federenden und andere Schleifprozessparameter umfassen. Werkstückparameter können beispielsweise Abmessungen, Material, Drahtstärke, oder eine Kennnummer der zu schleifenden Werkstück enthalten.In a preferred embodiment, the system for controlling the grinding machine provides that the server communication device receives actual grinding wheel data from the grinding machine communication device or is designed to receive this data, with the server having a computing unit that is designed to do so, based on actual grinding wheel data received and target grinding wheel data stored on the server, in particular stored grinding process parameters and/or workpiece parameters, to calculate a control command for the spring-end grinding machine, with the server communication device being designed to send the control command to the grinding machine communication device. In this respect, the calculation of a control command includes the comparison of the received actual grinding wheel data with the stored target grinding wheel data. The grinding process parameters can include, for example, the limit temperature for the spring ends and other grinding process parameters. Workpiece parameters can include, for example, dimensions, material, wire gauge, or an identification number of the workpiece to be ground.

Das System zur Schleifmaschinensteuerung kann in einer bevorzugten Ausgestaltung weiterhin vorsehen, dass eine Schleifmaschinen-Kommunikationseinrichtung in bzw. an der Schleifeinheit, insbesondere in bzw. an der Schleifscheibe angeordnet und mit dem Sensor verbunden und/oder eine Schleifmaschinen-Kommunikationseinrichtung mit der Verarbeitungseinheit verbunden ist. Eine mit der Verarbeitungseinheit (leitungsgebunden) verbundene Schleifmaschinen-Kommunikationseinrichtung kann in ein Steuermodul der Federendenschleifmaschine integriert bzw. in einem Steuerschrank der der Federendenschleifmaschine angeordnet sein, d.h. insbesondere relativ zur (rotierenden) Schleifscheibe feststehendend.In a preferred embodiment, the system for controlling the grinding machine can also provide for a grinding machine communication device to be arranged in or on the grinding unit, in particular in or on the grinding wheel, and connected to the sensor and/or a grinding machine communication device to be connected to the processing unit. A grinder communication device connected to the processing unit (wired) can be integrated into a control module of the spring-end grinder or arranged in a control cabinet of the spring-end grinder, i.e. in particular stationary relative to the (rotating) grinding wheel.

Das erfindungsgemäße Verfahren zur Steuerung einer Federendenschleifmaschine umfasst die folgenden Schritte:

  • Erfassen von Schleifscheibeninformationen durch mindestens einen Sensor, wobei der Sensor in die Schleifscheibe integriert, insbesondere in der Schleifscheibe aufgenommen, ist;
  • Übertragen von Schleifscheibeninformationen von dem Sensor an eine Verarbeitungseinheit der Federendenschleifmaschine durch eine Übertragungseinrichtung;
  • Ausgeben eines Steuerbefehls zur Steuerung der Federendenschleifmaschine durch die Verarbeitungseinheit, basierend auf an die Verarbeitungseinheit übertragenen Schleifscheibeninformationen,
wobei die Schleifscheibeninformationen mindestens eine der folgenden Schleifscheibeninformationen enthalten:
  • eine Temperatur der Schleifscheibe,
  • ein Abriebmaß der Schleifscheibe,
  • eine Unwuchtinformation, aus der sich Aufschlüsse über das Ausmaß einer Unwucht der Schleifscheibe ergeben,
  • eine Kennung des Typs der Schleifscheibe,
  • eine Drehzahl der Schleifscheibe, insbesondere bisherige Umdrehungen der Schleifscheibe im Betrieb,
  • eine Betriebszeit oder Lebensdauer, insbesondere verbleibende Lebensdauer, der Schleifscheibe,
  • eine Schleifkraft, insbesondere Anpresskraft, der Schleifscheibe.
The method according to the invention for controlling a spring end grinding machine comprises the following steps:
  • Detection of grinding wheel information by at least one sensor, the sensor being integrated into the grinding wheel, in particular accommodated in the grinding wheel;
  • transmitting grinding wheel information from the sensor to a processing unit of the spring end grinding machine through a transmission device;
  • the processing unit issuing a control command for controlling the spring-end grinding machine, based on grinding wheel information transmitted to the processing unit,
wherein the grinding wheel information includes at least one of the following grinding wheel information:
  • a temperature of the grinding wheel,
  • an abrasion measure of the grinding wheel,
  • an imbalance information that provides information about the extent of an imbalance in the grinding wheel,
  • an identifier of the type of grinding wheel,
  • a speed of the grinding wheel, in particular previous revolutions of the grinding wheel in operation,
  • an operating time or service life, in particular remaining service life, of the grinding wheel,
  • a grinding force, in particular contact pressure, of the grinding wheel.

Es wird auch ein Verfahren vorgeschlagen zur Auswertung von Prozessinformationen eines Schleifprozesses in einer Federendenschleifmaschine, wobei das Verfahren insbesondere die folgenden Schritte umfasst:

  • Erfassen von Schleifscheibeninformationen durch mindestens einen Sensor, wobei der Sensor in die Schleifscheibe integriert, insbesondere in der Schleifscheibe aufgenommen ist;
  • Übertragen von Schleifscheibeninformationen von dem mindestens einen Sensor an eine Verarbeitungseinheit der Federendenschleifmaschine durch eine Übertragungseinrichtung,
  • Ablegen der Schleifscheibeninformationen in einer Speichereinheit Zurverfügungstellung für nachfolgende Auswertungen,
wobei die Schleifscheibeninformationen mindestens eine der folgenden Schleifscheibeninformationen enthalten:
  • eine Temperatur der Schleifscheibe,
  • ein Abriebmaß der Schleifscheibe,
  • eine Unwuchtinformation, aus der sich Aufschlüsse über das Ausmaß einer Unwucht der Schleifscheibe ergeben,
  • eine Kennung des Typs der Schleifscheibe,
  • eine Drehzahl der Schleifscheibe, insbesondere bisherige Umdrehungen der Schleifscheibe im Betrieb,
  • eine Betriebszeit oder Lebensdauer, insbesondere verbleibende Lebensdauer, der Schleifscheibe,
  • eine Schleifkraft, insbesondere Anpresskraft, der Schleifscheibe.
A method is also proposed for evaluating process information from a grinding process in a spring-end grinding machine, the method comprising the following steps in particular:
  • Detection of grinding wheel information by at least one sensor, the sensor being integrated into the grinding wheel, in particular being accommodated in the grinding wheel;
  • transmitting grinding wheel information from the at least one sensor to a processing unit of the spring-end grinding machine by a transmission device,
  • Storing the grinding wheel information in a storage unit making it available for subsequent evaluations,
wherein the grinding wheel information includes at least one of the following grinding wheel information:
  • a temperature of the grinding wheel,
  • an abrasion measure of the grinding wheel,
  • an imbalance information that provides information about the extent of an imbalance in the grinding wheel,
  • an identifier of the type of grinding wheel,
  • a speed of the grinding wheel, in particular previous revolutions of the grinding wheel in operation,
  • an operating time or service life, in particular remaining service life, of the grinding wheel,
  • a grinding force, in particular contact pressure, of the grinding wheel.

Außerdem wird die Aufgabe insbesondere gelöst durch ein Computer-lesbares Speichermedium, welches Instruktionen enthält, die mindestens einen Prozessor dazu veranlassen ein erfindungsgemäßes Verfahren zu implementieren, wenn die Instruktionen durch den Prozessor des Servers oder der Federendenschleifmaschine ausgeführt werden. Ein Computer-lesbares Speichermedium kann zum Beispiel ein mobiler Datenträger oder eine Festplatte sein, die in der Federendenschleifmaschine oder einen (externen) Server angeordnet sein kann.In addition, the object is achieved in particular by a computer-readable storage medium which contains instructions which cause at least one processor to implement a method according to the invention when the instructions are executed by the processor of the server or the spring-end grinding machine. A computer-readable storage medium can be, for example, a mobile data carrier or a hard disk, which can be arranged in the spring-end grinding machine or an (external) server.

Die Erfindung wird nachstehend auch hinsichtlich weiterer Merkmale und Vorteile anhand der Beschreibung von Ausführungsbeispielen und unter Bezugnahme auf die beiliegenden Zeichnungen näher erläutert. Hierbei zeigen:

Fig. 1
ein schematisches Schaubild zur Erläuterung der Wirkzusammenhänge bei einer erfindungsgemäßen Federendenschleifmaschine;
Fig. 2
die Federendenschleifmaschine nach Fig. 1 in schematischer Ansicht in Draufsicht.
The invention is explained in more detail below, also with regard to further features and advantages, on the basis of the description of exemplary embodiments and with reference to the accompanying drawings. Here show:
1
a schematic diagram to explain the functional relationships in a spring end grinding machine according to the invention;
2
the spring end grinding machine 1 in schematic view in top view.

Nachstehend wird die Implementierung der vorliegenden Erfindung in einem konkreten Ausführungsbeispiel, nämlich in einer konkreten Federendenschleifmaschine veranschaulicht. Die Federendenschleifmaschine 1 ist, wie aus dem Stand der Technik an sich bekannt, mit zwei oder mehr Ladetellern 10 ausgebildet, auf denen jeweils eine Vielzahl von Werkstückaufnahmeöffnungen 15 ausgebildet sind, um darin Schraubenfedern 3 haltern zu können. Die Ladeteller 10 sind exzentrisch um die Drehachse A drehbar auf einem Drehteller 17 derart angeordnet, dass ein Ladeteller 10 die Federn über eine Gleitplatte 16 zwischen zwei räumlich beabstandete Schleifplatten 13 einbringen kann. Der Drehteller 17 dreht sich um die Drehachse C. Die Schleifscheiben 13 schleifen, wie aus dem Stand der Technik hinlänglich bekannt, die Enden der Schraubenfedern plan, insbesondere planparallel, so dass die Schraubenfedern jeweils mit planparallelen Enden versehen sind. Die Schleifscheiben rotieren im Betrieb um die gemeinsame Drehachse B (Zustellschleifen) oder geringfügig zueinander verkippte Drehachsen B (Durchlaufschleifen). Die Federendenschleifmaschine 1 ist im Wesentlichen symmetrisch zur Symmetrieachse M aufgebaut.The implementation of the present invention is illustrated below in a specific exemplary embodiment, namely in a specific spring-end grinding machine. As is known per se from the prior art, the spring end grinding machine 1 has two or more loading plates 10 formed on each of which a plurality of workpiece receiving openings 15 are formed in order to be able to hold coil springs 3 therein. The loading plates 10 are eccentrically rotatable about the axis of rotation A on a turntable 17 in such a way that a loading plate 10 can introduce the springs via a sliding plate 16 between two spatially spaced sanding plates 13 . The turntable 17 rotates about the axis of rotation C. As is well known from the prior art, the grinding wheels 13 grind the ends of the helical springs plane, in particular plane-parallel, so that the helical springs are each provided with plane-parallel ends. During operation, the grinding wheels rotate around the common axis of rotation B (infeed grinding) or around axes of rotation B that are slightly tilted relative to one another (throughfeed grinding). The spring end grinding machine 1 is constructed essentially symmetrically to the axis M of symmetry.

Mindestens eine der Schleifscheiben 13, vorzugsweise beide Schleifscheiben sind erfindungsgemäß mit mindestens einem darin integrierten Sensor 30 ausgebildet. Ein oder mehrere Sensoren 30 können in der oberen Schleifscheibe 13 (wie in Fig. 1 und 2 dargestellt) und/oder in der der unteren Schleifscheibe 13 vorgesehen sein. In der vorliegenden Ausführungsform erfasst der Sensor 30 sowohl eine Temperatur der Schleifscheibe 13 an ihrer den Schraubenfedern 3 zugewandten Schleiffläche 131 als auch den jeweiligen Abrieb der Schleifscheibe 13. Es können aber auch separate Sensoren 30 vorgesehen sein, die jeweils eine Schleifscheibeninformation, z.B. eine Temperatur bzw. ein Abriebmaß, erfassen. Die Temperatur der Schleifscheibe 13 lässt sich beispielsweise über ein Thermoelement erfassen. Der Abrieb kann über einen Widerstandswert eines vom Abrieb mit erfassten Leiters im Bereich der Schleiffläche 131 mit erfasst werden. Die Messwerte des bzw. der Sensoren 30 werden dann einer in der Schleifscheibe 13 vorgesehenen Auswerteeinheit 31 zugeführt und über eine in der Schleifscheibe 13 integrierte Datenmanagement-Einheit 43 einer Sendeeinheit 51 zugeführt. Mittels der Sendeeinheit 51 werden die gewonnenen Schleifscheibendaten über eine Drahtlosverbindung 53 einer Empfangseinheit 52, die bei der vorliegenden Ausführungsform an dem feststehenden Teil der Federendenschleifmaschine 1 (d.h. außerhalb der rotierenden Schleifeinheit 11) angeordnet ist, zugeführt. Die in der Schleifscheibe 13 integrierte Sendeeinheit 51 und die an der Federendenschleifmaschine 1 implementierte Empfangseinheit 52 sind Bestandteile einer Übertragungseinrichtung 50, die eine drahtlose Kommunikation über eine Drahtlosverbindung 53 zwischen Schleifscheibe 13 und Federendenschleifmaschine 1 ermöglicht. Die drahtlose Kommunikation kann unidirektional von der Schleifscheibe 13 an die Federendenschleifmaschine 1 erfolgen. Bevorzugtermaßen ist die Kommunikation aber bidirektional, so dass auch Daten von der Federendenschleifmaschine 1 an die Schleifscheibe 13 übermittelt werden können.At least one of the grinding wheels 13, preferably both grinding wheels, are designed according to the invention with at least one sensor 30 integrated therein. One or more sensors 30 can be installed in the upper grinding wheel 13 (as in 1 and 2 shown) and / or in the lower grinding wheel 13 may be provided. In the present embodiment, the sensor 30 detects both a temperature of the grinding wheel 13 on its grinding surface 131 facing the helical springs 3 and the respective abrasion of the grinding wheel 13. However, separate sensors 30 can also be provided, which each provide grinding wheel information, e.g. a temperature or , a measure of wear. The temperature of the grinding wheel 13 can be detected, for example, using a thermocouple. The abrasion can also be detected via a resistance value of a conductor in the region of the sliding surface 131 that is also detected by the abrasion. The measured values of the sensor(s) 30 are then fed to an evaluation unit 31 provided in the grinding wheel 13 and fed to a transmission unit 51 via a data management unit 43 integrated in the grinding wheel 13 . The transmission unit 51 sends the grinding wheel data obtained via a wireless connection 53 to a receiving unit 52 which, in the present embodiment, is arranged on the stationary part of the spring-end grinding machine 1 (ie outside the rotating grinding unit 11). The transmitting unit 51 integrated in the grinding wheel 13 and the receiving unit 52 implemented on the spring-end grinding machine 1 are components of a transmission device 50 which enables wireless communication via a wireless connection 53 between the grinding wheel 13 and Spring end grinding machine 1 allows. The wireless communication can be unidirectional from the grinding wheel 13 to the spring end grinding machine 1 . However, the communication is preferably bidirectional, so that data can also be transmitted from the spring-end grinding machine 1 to the grinding wheel 13 .

Bevorzugtermaßen ist in der Schleifscheibe 13 auch eine Speichereinheit 14 implementiert. In der Speichereinheit 14 können nicht nur die von dem bzw. den Sensoren 30 erfassten Daten sondern auch zugehörige Prozessparameter, die von der Federendenschleifmaschine 1 über die Übertragungseinrichtung 50 an die Schleifscheibe 13 rückübertragen werden, abgelegt werden. Insofern können auch Daten, die von der Federendenschleifmaschine erfasst werden bzw. erfasst wurden, an die Schleifscheibe 13 rückübertragen werden, insbesondere Informationen über die Antriebskräfte, Drehzahlwerte, in der Federendenschleifmaschine erfasste Unwuchtwerte, etc. Insofern kann in der Schleifscheibe 13 die gesamte Historie verschiedener Schleifprozesse, bei denen die Schleifscheibe 13 zum Einsatz gelangt ist, abgelegt werden, einschließlich der jeweils bearbeiteten Schraubenfedern, der Prozessparameter, einschließlich Temperaturverläufen von Schleifgeschwindigkeiten, Umdrehungszahlen, Anzahl behandelter Federn, etc. Die in der Schleifscheibe 13 abgelegten Daten ermöglichen eine genaue Dokumentation der von der Schleifscheibe durchgeführten Schleifarbeiten, wobei hieraus auch Erkenntnisse zur Weiterentwicklung von Schleifscheiben und/oder Federendschleifmaschinen gezogen werden können.A memory unit 14 is preferably also implemented in the grinding wheel 13 . Not only the data recorded by the sensor(s) 30 can be stored in the memory unit 14 but also associated process parameters, which are transmitted back from the spring-end grinding machine 1 to the grinding wheel 13 via the transmission device 50 . In this respect, data that is or was recorded by the spring-end grinding machine can also be transmitted back to the grinding wheel 13, in particular information about the drive forces, speed values, imbalance values recorded in the spring-end grinding machine, etc. In this respect, the entire history of various grinding processes can be stored in the grinding wheel 13 , in which the grinding wheel 13 was used, including the coil springs processed in each case, the process parameters, including temperature profiles of grinding speeds, number of revolutions, number of treated springs, etc. The data stored in the grinding wheel 13 enable precise documentation of the Grinding wheel carried out grinding work, from which insights into the further development of grinding wheels and / or spring end grinders can be drawn.

Die vom in der Schleifscheibe 13 integrierten Sensor 30 erfassten Daten können aber auch dazu verwendet werden, unmittelbar Einfluss auf Steuerbefehle für den jeweiligen Schleifprozess zu nehmen. Zu diesem Zwecke werden die an der Empfangseinheit 52 der Federendenschleifmaschine 1 erhaltenen Schleifscheibeninformationen an eine Verarbeitungseinheit der Federendenschleifmaschine weitergeleitet. Bei der vorliegenden Ausführungsform ist die Verarbeitungseinheit 40 der Federendenschleifmaschine 1 unmittelbar in dieser integriert. Die Verarbeitungseinheit 40 kann aber auch extern vorgesehen sein. Die Verarbeitungseinheit 40 umfasst einerseits eine Speichereinheit 41 sowie andererseits eine Recheneinheit 42, um Steuerbefehle für einen konkreten Schleifprozess zu errechnen. Die Steuerbefehle für einen konkreten Schleifprozess hängen dabei auch von den über den Sensor 30 bzw. die Sensoren 30 erfassten Schleifscheibendaten, insbesondere der Temperatur an den Federenden bzw. an der Schleiffläche 131 sowie dem momentanen Abrieb ab.However, the data recorded by the sensor 30 integrated in the grinding wheel 13 can also be used to directly influence control commands for the respective grinding process. For this purpose, the grinding wheel information received at the receiving unit 52 of the spring-end grinding machine 1 is forwarded to a processing unit of the spring-end grinding machine. In the present embodiment, the processing unit 40 of the spring-end grinding machine 1 is directly integrated into it. However, the processing unit 40 can also be provided externally. The processing unit 40 includes, on the one hand, a storage unit 41 and, on the other hand, a computing unit 42 in order to calculate control commands for a specific grinding process. The control commands for a specific grinding process also depend on the ones detected via the sensor 30 or the sensors 30 Grinding wheel data, in particular the temperature at the spring ends or on the grinding surface 131 and the current abrasion.

Schließlich kann noch ein System 100 mit einer oder mehreren Federendenschleifmaschinen 1 und einem von einer Federendenschleifmaschine 1 räumlich getrennten Server 2 vorgesehen sein, an den Daten der Federendenschleifmaschine 1, umfassend Daten des in der Schleifscheibe 13 integrierten Sensors 30 bzw. der in der Schleifscheibe 13 integrierten Sensoren 30 geliefert werden. Zu diesem Zwecke umfasst der Server 2 eine Server-Kommunikationseinrichtung 21, die mit einer Schleifmaschinen-Kommunikationseinrichtung 12, die an der Federendenschleifmaschine implementiert ist, in einer Drahtlosverbindung 23 steht. Die Drahtlosverbindung 23 umfasst eine bidirektionale Datenkommunikation, die insbesondere auf Basis eines Mobilfunkstandards oder eines WLAN-Standards erfolgen kann. Vorliegend steht die Federendenschleifmaschine 1 über ein WLAN- oder ein Mobilfunknetzwerk mit einem Server 2 in Drahtlosverbindung 23. Dabei ist die Kommunikation bidirektional derart, dass sowohl eine Übertragung von Daten der Federendenschleifmaschine 1 zum externen Server 2 als auch eine Kommunikation vom externen Server 2 zur Federendenschleifmaschine 1 ermöglicht ist. Der Server 2 umfasst neben der Server-Kommunikationseinrichtung 21 eine Recheneinheit 22 sowie eine Speichereinheit 20. In der Speichereinheit 20 können die vom Sensor 30 bzw. den Sensoren 30 in der Schleifscheibe 13 bzw. in den Schleifscheiben 13 erfassten Daten ggf. korreliert mit den weiteren zugeordneten Prozessdaten abgelegt werden und für nachfolgende Steuer- oder Auswerteroutinen herangezogen werden.Finally, a system 100 with one or more spring-end grinding machines 1 and a server 2 spatially separate from a spring-end grinding machine 1 can be provided, on the data of the spring-end grinding machine 1, comprising data from the sensor 30 integrated in the grinding wheel 13 or from the sensor 30 integrated in the grinding wheel 13 Sensors 30 are supplied. For this purpose, the server 2 comprises a server communication device 21 which is in a wireless connection 23 with a grinding machine communication device 12 which is implemented on the spring-end grinding machine. The wireless connection 23 includes a bidirectional data communication, which can take place in particular on the basis of a mobile radio standard or a WLAN standard. In the present case, the spring-end grinding machine 1 has a wireless connection 23 to a server 2 via a WLAN or mobile network. The communication is bidirectional in such a way that both data transmission from the spring-end grinding machine 1 to the external server 2 and communication from the external server 2 to the spring-end grinding machine 1 is enabled. In addition to the server communication device 21, the server 2 includes a computing unit 22 and a storage unit 20. In the storage unit 20, the data recorded by the sensor 30 or the sensors 30 in the grinding wheel 13 or in the grinding wheels 13 can, if necessary, be correlated with the other data associated process data are stored and used for subsequent control or evaluation routines.

Bezugszeichenliste:Reference list:

11
Federendenschleifmaschinespring end grinding machine
22
Serverserver
33
Schraubenfedercoil spring
44
Schleifzonegrinding zone
1010
Ladetellerloading plate
1111
Schleifeinheitgrinding unit
1212
Schleifmaschinen-KommunikationseinrichtungGrinder communication facility
1313
Schleifscheibegrinding wheel
131131
Schleifflächegrinding surface
1414
Speichereinheitstorage unit
1515
Werkstückaufnahmeöffnungworkpiece receiving opening
1616
Gleitplattesliding plate
1717
Drehtellerturntable
2020
Speichereinheitstorage unit
2121
Server-Kommunikationseinrichtungserver communications facility
2222
Recheneinheitunit of account
2323
Drahtlosverbindungwireless connection
3030
Sensorsensor
3131
Auswerteeinheitevaluation unit
4040
Verarbeitungseinheitprocessing unit
4141
Speichereinheitstorage unit
4242
Recheneinheitunit of account
4343
Datenmanagement-Einheitdata management unit
5050
Übertragungseinrichtungtransmission facility
5151
Sendeeinheittransmitter unit
5252
Empfangseinheitreceiving unit
5353
Drahtlosverbindungwireless connection
100100
Systemsystem
AA
Drehachse des LadetellersAxis of rotation of the loading plate
BB
Drehachse der SchleifscheibeAxis of rotation of the grinding wheel
CC
Drehachse des DrehtischesAxis of rotation of the turntable
MM
Symmetrieachseaxis of symmetry

Claims (17)

  1. Spring end grinding machine (1), comprising:
    - at least one loading plate (10), mounted such as to be rotatable about an axis of rotation (A), for loading with workpieces (3), in particular coil springs (3);
    - a grinding unit (11) with at least one grinding disk (13) mounted such as to be rotatable about an axis of rotation (B), wherein the axis of rotation (B) of the grinding disk (13) is substantially parallel to the axis of rotation (A) of the loading plate (10);
    characterized by
    - at least one sensor (30) for detecting grinding disk information, in particular a temperature and/or a degree of wear of the grinding disk (13),
    wherein the sensor (30) is integrated in the grinding disk (13), in particular is accommodated in the grinding disk (13);
    - a processing unit (40) which is designed to output a control command for controlling the spring end grinding machine (1) on the basis of grinding disk information transmitted to the processing unit (40) and/or to store the grinding disk information in a memory unit (41);
    - a transfer device (50) for transferring grinding disk information from the sensor (30) to the processing unit (40), wherein the transfer device (50) is designed for wireless bidirectional data communication between the grinding disk (13) and the processing unit (40).
  2. Spring end grinding machine (1) according to claim 1,
    characterized in that
    the grinding disk information includes a characteristic value for the type of grinding disk (13), wherein grinding disk parameters which in particular are specific to a type of grinding disk are stored in the processing unit (40).
  3. Spring end grinding machine (1) according to claim 1 or 2,
    characterized in that
    a sensor (30) is designed as a thermocouple and/or a sensor (30) is designed as an infrared sensor, wherein at least one pair of electrodes of the thermocouple and/or a light guide, respectively, is oriented in a substantially axial direction of the grinding disk, in particular is accommodated in a grinding disk body.
  4. Spring end grinding machine (1) according to claim 3,
    characterized in that
    a pair of electrodes of the thermocouple is connected to a resonant circuit, in particular of an evaluation unit (31) of the sensor (30), in order to determine a degree of wear of the grinding disk (13), in particular on the basis of a detected resonant signal of the resonant circuit.
  5. Spring end grinding machine (1) according to any one of the preceding claims,
    characterized in that
    a sensor (30) comprises a piezoelectric element and in particular is designed as an ultrasonic sensor.
  6. Spring end grinding machine (1) according to any one of the preceding claims,
    characterized in that
    a sensor (30) is a rotational speed sensor, in particular an acceleration sensor, for detecting the number of revolutions of the grinding disk (13).
  7. Spring end grinding machine (1) according to any one of the preceding claims,
    characterized in that
    the grinding disk (13) has an evaluation unit (31) which is designed to process sensor signals generated by the sensor (30) and containing grinding disk information, wherein the evaluation unit (31) is in particular integrated in a grinding disk mount, preferably in the grinding disk flange.
  8. Spring end grinding machine (1) according to any one of the preceding claims,
    characterized in that
    the grinding disk (13) has
    - a memory unit (14) for storing grinding disk data containing grinding disk information, and
    - a data transfer interface for reading out recorded grinding disk data, in particular grinding disk data sets, which describe grinding disk information trends over time.
  9. Spring end grinding machine (1) according to any one of the preceding claims,
    characterized in that
    the processing unit (40) has
    - a memory unit (41) for storing grinding disk data containing grinding disk information, and
    - a computing unit (42) which is designed to calculate a control command for the spring end grinding machine (1) on the basis of actual grinding disk data and target grinding disk data stored in the memory unit (41), in particular stored grinding process parameters and/or workpiece parameters.
  10. Spring end grinding machine (1) according to any one of the preceding claims,
    characterized in that
    the transfer device (50) comprises a transmitting unit (51), which is connected to the sensor (30) and in particular is arranged in the grinding unit (11), and a receiving unit (52), which is connected to the processing unit (40), for the contactless transfer of grinding disk information.
  11. Spring end grinding machine (1) according to any one of the preceding claims, in particular according to claim 10,
    characterized in that
    the transfer device (50) is designed to transfer sensor signals, which are detected by the sensor (30) and contain grinding disk information, to the processing unit (40) in an inductive, capacitive or other suitable manner, in particular wirelessly, wherein the transmitting unit (51) and the receiving unit (52) are embodied in particular as induction coils which are coaxial with the axis of rotation (B) of the grinding disk.
  12. System (100) for controlling a spring end grinding machine, characterized by
    - a spring end grinding machine according to any one of claims 1 to 11;
    - a server (2) having a memory unit (20) for storing grinding disk data containing grinding disk information;
    - at least one grinding machine communication device (12) for communication between the spring end grinding machine (1) and the server (2) via a wireless network connection; and/or
    - a server communication device (21) for communication between the server (2) and the spring end grinding machine (1) via a wireless network connection.
  13. Grinding machine control system according to claim 12,
    characterized in that
    the server communication device (21) is designed to receive actual grinding disk data from the grinding machine communication device (12),
    wherein the server (2) has a computing unit (22) which is designed to calculate a control command for the spring end grinding machine (1) on the basis of received actual grinding disk data and target grinding disk data stored on the server (2), in particular stored grinding process parameters and/or workpiece parameters,
    wherein the server communication device (21) is designed to transmit the control command to the grinding machine communication device (12).
  14. Grinding machine control system according to claim 12 or 13,
    characterized in that
    a grinding machine communication device (12) is arranged in or on the grinding unit (11), in particular in or on the grinding disk (13), and is connected to the sensor (30), and/or a grinding machine communication device (12) is connected to the processing unit (40) .
  15. Method for controlling a spring end grinding machine (1) according to any one of claims 1 to 11,
    wherein the method for controlling the spring end grinding machine (1) comprises the following steps:
    - the at least one sensor (30) detects grinding disk information;
    - the transfer device (50) transfers grinding disk information from the sensor (30) to the processing unit (40) of the spring end grinding machine (1),
    - at least one grinding machine communication device (12) transmits grinding disk information from the spring end grinding machine (1) to a server communication device (21) of a server (2), in particular via a wireless network connection; and/or
    - grinding disk data containing grinding disk information are stored on the server (2), in particular in a memory unit (20) of the server (2); and/or
    - the grinding machine communication device (12) of the spring end grinding machine (1) receives grinding disk data, in particular target grinding disk data, and/or a control command for the spring end grinding machine (1) from the server communication device (21) of the server (2), in particular via a wireless network connection,
    - the processing unit (40) outputs a control command for controlling the spring end grinding machine (1) on the basis of grinding disk information transferred to the processing unit (40) ;
    wherein the grinding disk information includes at least one of the following grinding disk information:
    - a temperature of the grinding disk (13),
    - a degree of wear of the grinding disk (13),
    - an imbalance information indicating the extent of an imbalance of the grinding disk (13),
    - an identifier of the type of grinding disk (13),
    - a rotational speed of the grinding disk (13), in particular revolutions of the grinding disk (13) thus far during operation,
    - an operating time or life span, in particular a remaining life span, of the grinding disk (13),
    - a grinding force, in particular a contact pressure, of the grinding disk (13).
  16. Method for controlling a spring end grinding machine according to any one of claims 1 to 11, comprising the following steps:
    - at least one sensor (30) detects grinding disk information, wherein the sensor (30) is integrated in the grinding disk (13), in particular is accommodated in the grinding disk (13);
    - a transfer device (50) wirelessly transfers grinding disk information from the at least one sensor (30) to a processing unit (40) of the spring end grinding machine,
    - the grinding disk information is stored in a memory unit (14, 41) in order to be made available for subsequent evaluations,
    wherein the grinding disk information includes at least one of the following grinding disk information:
    - a temperature of the grinding disk,
    - a degree of wear of the grinding disk,
    - an imbalance information indicating the extent of an imbalance of the grinding disk (13),
    - an identifier of the type of grinding disk,
    - a rotational speed of the grinding disk, in particular revolutions of the grinding disk thus far during operation,
    - an operating time or life span, in particular a remaining life span, of the grinding disk,
    - a grinding force, in particular a contact pressure, of the grinding disk.
  17. Computer-readable storage medium, containing instructions which cause at least one processor to implement a method according to any one of claims 15 or 16 when the instructions are executed by the processor of the server (2) or of the spring end grinding machine (1) according to any one of claims 1 to 11.
EP18183775.8A 2018-07-16 2018-07-16 Compression spring grinding machine Active EP3597362B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1273433B (en) * 1995-01-19 1997-07-08 O M D Officina Meccanica Domas COMPRESSION SPRING GRINDING MACHINE, WITH HIGH VERSATILITY OF USE
US6602109B1 (en) * 1998-12-16 2003-08-05 University Of Massachusetts Grinding wheel system
CN101080304B (en) * 2004-12-17 2013-03-06 密尔沃基电动工具公司 Smart accessories for power tools
DE102006037490B4 (en) * 2006-08-10 2011-04-07 Peter Wolters Gmbh Double-sided processing machine
DE102007011880A1 (en) * 2007-03-13 2008-09-18 Peter Wolters Gmbh Processing machine with means for detecting processing parameters
EP2926948B9 (en) 2014-04-01 2024-07-10 OFFICINA MECCANICA DOMASO S.p.A. Air-cooling grinding wheels and loading plate of spring end grinding machine
SG10201600301SA (en) * 2016-01-14 2017-08-30 3M Innovative Properties Co CMP Pad Conditioner, Pad Conditioning System And Method
DE102016116012A1 (en) * 2016-08-29 2018-03-01 Lapmaster Wolters Gmbh Method for measuring the thickness of flat workpieces

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