DE1114109B - Device for the automatic dressing of two interacting grinding wheels of a spring end grinding machine - Google Patents

Description

Device for the automatic dressing of two interacting grinding wheels a spring end grinding machine Dressing the grinding wheels of spring end grinding machines takes place in the known machines in that the dressing tools by hand the grinding wheels to be dressed are delivered and then the grinding wheels are flat be judged. After straightening the panes, they have to be put back into place set set-up status are brought, d. H. at a distance from each other that corresponds to the nominal grinding dimension of the springs to be ground. This work requires a lot of experience, as both the dressing tools, namely the dressing wheels, as well as the grinding wheels when leveling, for example by choosing one large delivery can easily be damaged to the point of uselessness.

The leveling of the grinding wheels of spring end grinding machines therefore has to date always been carried out by experienced and specially trained skilled workers will. Another disadvantage of the previous way of working is the long set-up times, which requires the dressing tools and the grinding wheels to be delivered. Of the Process is particularly due to the heavy wear of the dressing tools, for example the dressing wheel, and the wear and tear of the grinding wheels themselves complicated.

In a known spring end grinding machine with two in horizontal Flat rotating grinding wheels is a dressing arm with one for each grinding wheel certain dressing tool is arranged so that it can pivot hydraulically, if necessary pivoted into a starting position for dressing between the two grinding wheels can be. With this device, however, after swiveling in the dressing arm the two grinding wheels still by hand using specially designed ones Adjusting wheels are advanced against the dressing tool. A fully automatic one There is no dressing device in these known machines.

Another known device is a mechanical twisting device provided in which two dressing diamonds are arranged displaceably in the axial direction are, however, the shift takes place in each case by means of a handwheel.

In other known dressing devices for grinding wheels from Camshaft grinding machines, a guide stop is provided for the dressing tool, on which the dressing tool comes to rest during dressing. Delivery the grinding wheel is done here by hand using a handwheel through which the threaded spindle is operated. To adjust the dressing tool is also connected to the carrier of a stop pin which rests against a guide, wherein the stop pin is fastened in a carriage which is slidably mounted.

These known devices differ significantly of dressing devices of the present type, since they only have a single grinding wheel is to be trained.

Finally there is a grinder with a grinding wheel become known, in which a fixed measuring base is provided for the grinding wheel. This known device also does not work fully automatically, as it does after dressing the grinding wheel and grinding the workpiece special measures must be taken so that the specified reference base can be determined anew can be. The workpiece is then in this known device by the The grinding wheel is ground down until the grinding dimension has been reached that was previously was determined by setting by hand in relation to the measuring base.

In contrast, the invention is based on the object of a device to create for spring end grinding machines or similar processing machines, by means of which the leveling of grinding wheels takes place automatically. The establishment should in particular be designed so that after flipping a switch that too The dressing tools can be set up as a selector switch for a specific dressing wheel automatically into the correct working position, taking into account their wear and tear be brought to the grinding wheels, with the wear and tear of the grinding wheels automatically taken into account will. In particular, the facility should be designed in such a way that the set-up status is maintained by itself or is readjusted and the dressing of the disks also inevitably after Switching on the selector switch is controlled.

According to the invention, the device is characterized for automatic Dressing of two interacting grinding wheels of a spring end grinding machine or the like, in which at least one grinding wheel is axially adjustable with respect to the other is and the grinding wheels deliverable dressing tools, z. B. dressing wheels assigned are, in that the dressing members are in operative connection with tactile means, the in turn are coupled with end limiters, and that at least one dressing element has another button with an adjusting device for the adjustable Disc communicates. Preferably one is based on the grinding distance of the springs to be ground adjustable measuring. basis, their end delimiter. are in operative connection with the tactile elements for the dressing and grinding tools and limit their displacement.

The measurement base is used to create a fixed and immovable reference base with their manual or remote control fine adjustment of the workpiece feed path permanently assigned. However, a different reference base can also be selected, for example the grinding wheel level or a suitable base on the machine itself.

For automatic adjustment of the dressing tools and / or the Grinding wheels, for example, a hydraulic system is provided, its effectiveness by making contact between the buttons on the dressing tools and the limit stops or vice versa is controlled.

This hydraulic system, which is also through an electrical or mechanical Adjusting device could be replaced, moves after turning on a selector switch the dressing tool automatically towards the wheel selected for leveling and fixes the dressing tool in this position during the dressing process.

In the illustrated embodiment, it is preferably parallel A slidable support is provided for the axis of the grinding wheels on the quills are arranged as a carrier of the dressing tools. These dressing tools are for example mechanically or electrically or photoelectrically acting tactile organs assigned to the join in their shifting movement, i.e. the movement of the support. With the organ of touch For the dressing tools, the end limiters of the measuring base are effectively connected, so that the buttons give their measuring position to this end limiter. At the moment, where the buttons on the dressing tools make contact with the end limiter is preferred The infeed movement of the support is interrupted and through via another contact all-round closure of the hydraulic system of the support fixed in its position. The automatic infeed of the grinding wheels to the limit set by the limiters Position of the dressing tools. cause measuring or tactile organs, which are also expedient the dressing tools are assigned as measuring elements, the measured value of these buttons as adjustment via intermediate members on a preferably hydraulic working cylinder is given, which then puts the grinding wheel on the specified working plane of the dressing tools shifts.

In the drawing, an embodiment of the invention is in. Schematic Illustration shown.

On a support 1, one or more quills - in the exemplary embodiment the quills 2, 2a - are arranged, on which the dressing wheels 3, 3a are mounted. The support as the carrier of the dressing tools 3, 3 a lies in the exemplary embodiment parallel to the axis of the grinding wheels 4, 4 a and is displaced in this direction by the piston 5 of the actuating cylinder 6. This actuating cylinder 6 is connected to a liquid pump, preferably an oil pressure pump 10, via lines 7, 8 with the interposition of the switch designed as a selector switch 9. Depending on the position of the selector switch 9, oil is either passed into the chamber 6 a or 6 b of the cylinder 6, so that the support 1 with the sleeves 2, 2a is moved either up or down. Here, the dressing tools move towards one or the other grinding wheel. The arrangement can also be made so that each. The dressing tool is driven independently of each other after switching on the dressing process and fed to the associated grinding wheel. The dressing wheels 3, 3a are thus brought into a working distance corresponding to their target grinding dimension. The pressure medium escaping from the other chamber of the actuating cylinder 6 during the advance of the piston 5 flows via the associated line via the switch 9 into the intermediate line 12 connected to the return line 11 and from there via the valve 13 into the return line 11. According to the invention, the valve 13 is in operative connection with a device which indicates or determines the nominal setting of the dressing wheels, preferably a measuring base which is limited by the adjustable end limiters. In the exemplary embodiment, these end limiters 14, 15 are mounted on a switching rod 16 which is resiliently mounted so that it can move back and forth in both directions of displacement.

For this purpose, two are opposite at one end of the shift rod 16 acting compression springs 17,18 provided. A shifting movement of the shift rod 16 is on the valve via the hook switch 19 hinged to the switching rod 16 13 transmitted, whereby this goes into the closed position and the hydraulic system, consisting of actuating cylinder 6, lines 7, 8, 12, 11, absolutely fixed, see above that a further movement of the actuating piston 5 after completion of the preferably designed as a cone valve valve 13 is impossible.

The end limiters 14, 15 arranged on the shift rod 16 are advantageously equipped with adjustable fine adjusters. Furthermore, the end limiters 14, 15 arranged on the shift rod 16 and the valve 13 are expediently permanently assigned to an immovable reference plane. In the exemplary embodiment, the workpiece feed path 21 is provided as a fixed reference plane, in which the measuring base 14, 15 and with it the parts 16, 17, 18, 19, 13 are firmly connected via connecting rods 22, 23. The measuring base makes all changes in position of the workpiece feed path with it.

The sensing elements 24, 24 a provided according to the invention for the dressing wheels 3, 3 a are in active connection with the end limiters 14, 15 of the switching rod 16. These sensing elements can be designed as mechanical, hydraulic or photoelectric sensors, which the dressing wheel. are assigned in such a way that they constantly measure their diameter and so any change in diameter of the wheels that occurs as a result of wear when straightening the disks. In the illustrated embodiment, the sensing elements 24 and 24a for the dressing wheels 3, 3a are designed as spring-loaded scanning levers 26 and 26a, one lever arm of which rests against the dressing wheels, while the other, free lever arm extends into the stop area of the end limiter or their Fine adjuster is guided. When the dressing wheels 3, 3 a are worn, the levers 26, 26 a of the feeler elements 24, 24 a move at an angle and thus move further away from the end limiters 14, 15, which are fixedly arranged on the switching rod 16. The support 1 with the dressing pins 2 , 2 a is accordingly moved further to the grinding wheel 4 or 4 a to be dressed by this amount.

Since the grinding wheels 4, 4a after the dressing process again the previously set up position that corresponds to the target grinding dimension should take, are according to the invention still means for infeed of the grinding wheels on the the target grinding plane provided dressing wheels. In the exemplary embodiment, in which such a fully automatic infeed only for the upper grinding wheel 4a is provided; is according to the invention because the dressing wheel 3 a weight and or or spring-loaded additional button 27 assigned, which is also on the dressing sleeve sits down and constantly lays down against the dressing wheel.

A switching linkage 28 mounted at 29 is aligned with this button 27, that occurs when there is a height shift between the grinding wheel working surface and the corresponding edge of the dressing wheels is inclined and via a contact or a valve, a preferably hydraulic system for the delivery of the grinding wheel 4a switches on, so that when this circuit is switched on, which in the exemplary embodiment from a double switch 30 with oil pump 31, return 32 and actuating cylinder 33 with supply lines 34, 35, the pressure medium in the corresponding chamber of the Actuating cylinder 33 passed and so on piston 36 on the grinding wheel 4a the working plane of the dressing wheels 3 a determined by the button 27 is set. It is easily possible instead of the mechanical one provided in the exemplary embodiment Button 27 to use an electrical, optical or the like button. Likewise can instead of a hydraulic adjustment system for the grinding wheel, mechanical, electrical or magnet-electric adjustment means can be provided.

The mode of operation of the device according to the invention is as follows: The operator switches the dressing process for the upper or lower disk 4 a or 4 a. In the example shown, this should Dressing tool 3 a upwards from the motor 37 with the interposition of suitable coupling members be fed to the grinding wheel 4a. By turning on the selector switch 9 oil pressure is given via the line 8 into the chamber 6 a of the actuating cylinder 6. The working piston 5 moves under the influx of the pressure medium in the cylinder 6 upwards and thus takes the support connected to it with the dressing quills 2, 2a, the dressing wheels 3, 3a and the buttons 24, 24a with.

Since the buttons 24, 24 a are assigned to the fixed measuring base by means of rods 26, 26 a , the infeed movement of the support 1 with quills 2, 2 a is limited by this assignment. In the exemplary embodiment, this takes place during an adjustment movement of the support 1 directed towards the upper grinding wheel 4 a by stopping the pushbutton lever 26 a on the fine adjuster 20 of the end limiter 15.

If the dressing wheels wear out, the linkage 26a has changed accordingly inclined, so that it is about the amount of inclination, so the amount by which the diameter of the dressing wheels has become smaller, later to the end stop 20, 15 arrives, whereby the support 1 and the dressing spindle 2 a to a corresponding A little further upwards to be delivered closer to the grinding wheel 4 a.

As soon as the free end of the button lever 26a (or vice versa Direction when selecting the lower grinding wheel 4 by means of the selector switch 9 of the button lever 26) has touched the end limiter 20 or 15, a slightly upward force applied to the end limiter 15.

According to the invention, this force is used to fix the actuating piston 5 used in the position in which the contact was made. That by means of the counter springs 17, 18 movably mounted shift linkage 16 is reduced when contact is made Measure taken upwards; while the spring 18 is compressed, and over the Hook switch 19, which goes up with the linkage, the valve 13 is closed. The return of the pressure medium from the line 7 is completely blocked, so that also no further oil can flow through the line 8 into the chamber 6 a. The hydraulic The system for the delivery of the dressing tools is absolutely fixed so that the tools can no longer move.

In this fixed position, the dressing wheels 3 a are in the correct position Position with reference to the plane defined by the end stop 15, which corresponds exactly to the target grinding plane. If now the working surface of the grinding wheel 4 a is not yet in this nominal loop level, the button 27 has accordingly set obliquely and its position transferred to the double switch 30, the now in turn the hydraulic system for actuating the feed piston 36 the grinding wheel 4 a switches such that the pump 31 of this hydraulic System pressure fluid is passed into the corresponding chamber of the cylinder 33 will.

The button 27 thus measures the correction of the grinding wheel 4 a and causes it to be fed into the correct grinding position. When this target grinding position is reached the linkage lever 28 is moved back into its neutral position via a bearing 29 and turns off the oil supply to the actuating cylinder 33, whereby the grinding wheel is stopped. The upper grinding wheel 4 a is now on the upper target grinding plane set. The infeed for the lower grinding wheel can be performed in a corresponding manner 4 must be set up.

In the exemplary embodiment, the lower grinding level is set semi-automatic, in the way that when choosing the grinding wheel 4 the dressing wheels to the target grinding dimension automatically by means of the hydraulic System for the dressing wheels. The grinding wheel 4 itself is firmly connected to the drive motor 37. Instead of an automatic adjustment of this For heavy parts, an adjustment of the workpiece feed path 21 appears via a Adjusting element 38 simpler, wherein, as already stated, the measuring base 14, 15 with Linkage 22, 23 and the part 13, 19, 18, 17, 16, 14, 15 to the same extent the adjustment movement join the workpiece feed track.

It is conceivable to complete the facility in such a way that that, for example, the time of dressing is automatically controlled by one of the workpieces, So the springs scanning or measuring device is determined such that the individual delivery and. Trigger dressing processes.

Claims (10)

PATENT CLAIMS: 1. Device for the automatic dressing of two interacting grinding wheels of a spring end grinding machine, in which at least one grinding wheel is axially adjustable with respect to the other and dressing tools that can be delivered to the grinding wheels, e.g. B. dressing wheels, are assigned, characterized in that the dressing elements (3, 3 a) with sensing means (24, 24 a) are in operative connection, which in turn are coupled to end limiters (14, 15), and that at least one dressing element (3 a ) has a further button (27) which is connected to an adjusting device (29, 30, 33) for the adjustable disc (4). 2. Establishment according to claim 1, characterized in that one on the grinding distance of the sliding springs adjustable measuring base is provided, the end limiter (14, 15) with the feeler elements (26, 26a) for the dressing and grinding tools (3, 3 a) are in operative connection and limit their displacement. 3. Device according to claim 1 or 2, characterized in that the measuring base of the workpiece feed path (21) is permanently assigned and that the end limiters (14, 15) are provided with fine adjustment means are. 4. Device according to claim 1 to 3, characterized by the dressing tools (3, 3 a) preferably parallel to the grinding wheel axis shifting hydraulic System whose effectiveness is achieved by making contact between the dressing button (3, 3 a) and the limit stop (14, 15) is switchable. 5. Device according to claim 1 to 4, characterized by one preferably parallel to the grinding wheel axis by means of a hydraulic one Actuating cylinder (6) displaceable support (1) as a carrier for the dressing tools (3, 3 a) and these permanently assigned, following the displacement movement of the support (1) mechanical sensing elements (24, 24a), the measuring position of which is on the limit stops (14, 15) the fixed measuring base, and that preferably hydraulic means for automatic infeed of the grinding wheels to the limiters (14, 15) fixed position of the dressing tools (3, 3 a) are provided. 6. Establishment according to claim 1 to 5, characterized in that the grinding wheels (4, 4 a) corresponding to the measured value of a measuring element (27) assigned to the dressing tool be moved. 7. Device according to claim 5, characterized in that as Adjusting means for the grinding wheel (4 a) a connected to a hydraulic system, hydraulically acting working cylinder (32) is provided, the fluid supply of which controlling valve (33) actuated by the button which is assigned to the dressing tool will. B. Device according to Claims 1 to 6, characterized in that the Support (1) with the dressing quills (2, 2a) controlling hydraulic working cylinders (6) with on / off switch and on / off switch and one associated with the end limiter (14, 15) Closing valve (13) forms a closed hydraulic system. 9. Establishment according to claim 8, characterized in that the end limiters (14, 15) have fine stone adjusters (20) are resiliently mounted in such a way that the of the buttons (26, 26a) on the end limiter (14, 15) given stop pulse the closing movement of the cone valve (13) for the hydraulic system causes at least one dressing tool in the target working position is immovably stored. 10. Device according to one of claims 1 to 9, characterized due to the adjustable arrangement of the workpiece feed path (21) relative to the fixed arranged grinding wheel (4) and by assigning the end limit stops to this workpiece feed path that it controls the displacement movements of the workpiece feed path Execute (21) with. Publications considered: German Patent Specifications No. 733 738, 738 048; French Patent No. 669,887; French additional patent specification No. 43,664; British Patent Nos. 474 542, 758 789; U.S. Patents No. 2,285,717, 2,393,937.