JPS6274558A - Multistage fabricating process device in fms - Google Patents

Abstract

PURPOSE:To enhance the fabricating efficiency and production efficiency and to make possible to cope with an interruption process or the like, by providing a pallet stocker, a preparatorily planning station, a conveyer device, an I/O means and a demand instruction preferential order processing means. CONSTITUTION:A CPU 100, a main control device 101 and NC devices 103a through 103d in MC 102a through 102d are linked to an optical data highway 104, and take in required NC data, as necessary, through an NLU. Further, a main control device 101 is connected with a control device 106 and PC devices 108a through 108d. The NLU is connected with a terminal unit 111, and therefore, demand instructions and data are sent to the CPU at a key board. With this arrangement, there way be provided a preferential order processing means for giving a preferential order from a post stage with a demand instruction at the final stage being taken as the most preferential one, and therefore, a workpiece is conveyed and treated preferentially from the output of the FMS fabrication, and therefore, the fabrication may be made in a latency time which is as short as possible, thereby it is possible to enhance the fabricating efficiency and the production efficiency.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to a flexible manufacturing system (hereinafter referred to as FMS) for a machine tool, in which a workpiece is divided into multiple steps and sequentially processed to complete the process. The present invention relates to a multi-step processing device in FMS applied to.

<Conventional technology> Conventionally, FMS in machine tools is operated based on the machining schedule and setup schedule for workpieces or workpiece pallets that have already been determined, so even if it is possible to transport the finished product to the setup stand, for example, Even if post-process processing is completed and transport is possible, the transport vehicle often performs other operations based on the above-mentioned schedule, and transport efficiency is not necessarily taken into account.

Furthermore, when emergency processing such as interrupt processing is required, data is uploaded to an upstream central control unit (host computer) and processing schedules and setup schedules are rearranged.

<Problems to be Solved by the Invention> However, in the prior art described above, there are many operations in which workpieces are temporarily placed on standby in the pallet stocker (in other words, the waiting time increases and processing efficiency is not necessarily improved). In interrupt processing and emergency processing,
It lacked flexibility because it required rearranging processing schedules and setup schedules.

An object of the present invention was proposed in order to solve the problem in view of the above circumstances, and to perform control that can maximize the transport efficiency of a transport vehicle in an FMS, and to
FM that increases the processing efficiency and production efficiency of MS and allows for flexible response to emergency processing such as interrupt processing.
An object of the present invention is to provide a multi-step processing device for S.

Means and Effects for Solving Problems> The present invention provides a request command priority processing means in which the request commands of the final process are given the first priority and priorities are given from the subsequent processes in the FMS machining process. It is at the point that I have set.

In other words, by transporting workpieces with priority from the exit of the FMS, the workpieces that have been processed can be transported immediately.
The aim is to process the next workpiece as quickly as possible with as little waiting time as possible.The specific means for doing so is to use a machine tool that divides the workpiece to be processed in multiple steps into multiple steps and processes them sequentially. a pallet stocker for storing pallets; a setup station disposed in a part of the pallet stocker for mounting workpieces on the pallet; and between the setup station, the pallet stocker, and the machine tool group. a conveyance device that moves the workpiece and transfers and delivers the workpiece;
An input/output means for inputting/outputting requests from the setup station and a transfer operation procedure of the transfer device are given priority to the request commands of the final process with respect to the request commands of the input/output means and the machine, and priority is given from the subsequent process. It is characterized by the provision of priority order processing means for request commands.

Therefore, by adopting the device of the present invention, the workpieces are conveyed and processed by the conveyance device with priority from the exit of the EMS, and the workpieces that have been processed are immediately conveyed and the next workpiece is waited for as long as possible. Processing can be done quickly without time constraints.

<Example> Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

(1,1 First, an outline of the FMS of a machine tool to which the present invention is applicable will be explained.

FIG. 2 is a schematic diagram of an EMS suitable for carrying out the present invention.

In FIG. 2, the system is roughly configured with a management department and a work department, and the management department is equipped with a central control unit 100, and controls the flow of each machining process while the system is online, NC data as machining information, tool data, preparation, etc. Information such as schedule data and setup schedule data is comprehensively understood and managed.

Is there a central system in the work department? The NC data sent from the 111 device 100 every moment is sequentially transmitted to each machining center 102a,
NC device 103a of 102b, 102c and 102d
, 103b, 103c and 103d receive. If a workpiece is to be completed in two processing steps, for example, the first step is processed in machining center 102a or 102b among the machining centers 102a to 102d, and the second step is processed in machining center IQ2C or 102d. There is. In this embodiment, up to four processes are possible, but of course it is possible to add more processes, and the process is not limited to this. Along with the central control device 100, the main control device 101 and the NC devices 103a, 103b, 103
c and 103d are linked to the optical data highway 104, and are adapted to take in necessary NC data as needed via an NLU (Network Linkage Unit).

Further, the main control device 101 is connected to a transport control device 106 that directly controls a transport vehicle 110 that transports the pallet P on which the work W has been rotated. Furthermore, the main controller ff 101 controls each machining center 102a, 102.
b, 102c and IO2d PC devices (referred to as programmable controllers) 108a, l08b, 10
8c and 108d, and controls the transmission and reception of request signals from the machine side, command signals from the central control device 100, and the like.

A plurality of pallets P for stocking raw materials or processed products are placed on the pallet stocker 107. There are setup tables 10 at several locations on the pallet stocker 107.
9 is provided, and an operator performs setup work for attaching workpieces to be processed onto the pallet P on a setup stand 109 serving as a setup station.

The pallet with workpieces P set up on the set-up table 109 is carried in and out of various locations by a transport vehicle 110 controlled by the transport control device 10G, which moves along the transport line 105.

On the other hand, a field terminal 111 is connected to the NLU, and by tapping the keyboard of the field terminal 111, a worker transmits request commands, management data, etc. to the central control device 100.

The present invention provides an FMS as shown in FIG.
Machining centers 102a and 102b which are C machine tools
is the first process, and the machining centers 102C and 102d are the second process.
11 (for example, a request for setup by a worker) and a multi-step machining processing device that has improved the service processing method of a transport vehicle 110 that transports work pallets in response to request commands output from each machining center 102a to 102d, etc. In the FMS machining process, a request command priority processing means is provided in which the request command for the final process is given first priority and priority is given from the subsequent process. In other words, by transporting workpieces with priority from the exit of the FMS machining process, the workpieces that have been processed can be transported immediately, and the next workpiece can be processed as quickly as possible with as little waiting time as possible. It is a process processing equipment.

(2) The basic concept of priority processing of request commands, which is a feature of the present invention, is explained, in which the request commands of the final process are given first priority and priorities are given from the subsequent processes.

FIG. 3 is an explanatory diagram illustrating the priority order of pallet transport requests, and shows the pallet stocker 107, the setup table 109, and the machining centers 102a to 102 for the first process and the second process.
d is a model diagram showing the pallet P conveyance order of the conveyance vehicle 110 in relation to FIG.

Moreover, FIG. 3 shows a series of flows of work pallets subjected to multi-step processing in the FMS. The required pallet P is transferred from the pallet stocker 107 to the setup table 10.
When the setup is requested to 9, the pallet P is transferred to the transport cart 110.
If there is a completed workpiece, the workpiece is removed, and a material workpiece to be processed next is attached by hand to the setup table 109. Subsequently, the pallet P is transported from the setup table 109 to the machining center M-1 for the first process or via the pallet stocker 107 to the machining center M-1. Next, the machining center M for the first process
-1 to the machining center M-2 of the second process or via the pallet stocker 107 to the machining center M-2.
Pallet P is conveyed to No. 2. The machining center M-2 of the second process is transferred to the setup table 109 or via the pallet stocker 107 to the setup table 109 (reference position) P, and the completed workpiece is removed.

When the normal material work is attached, it is transported to a predetermined pallet stocker 107.

In the flow of such a bullet a transport, the present invention adds a loading/unloading priority to the n-th process among the total number of processing processes N. Carrying out; (N-n)X2+2.1 people;
It is defined as (N-n)X2+3.

Regarding the setup table, the above equation is used for n = 0° at the time of unloading, and rank 1 at the time of loading.

Based on this definition, in this example, the total number of processing steps N = 2
In the second process (n=2), the order of unloading and loading is 2.3 respectively.
In addition, the order of carry-out and carry-in in the first step (n=1) is 4.5. The loading order of the setup table is i, *out is 6
and prioritized.

That is, in FIG. 3, the order in which the pallet P is carried from the machining center M-2 or from the pallet stocker 107 to the setup table 109 is 1, and from the machining center M-2 in the second process to the setup table 109 or the pallet stocker 107. The order of being carried out is 2. The order in which the baren) P is carried into the machining center M-2 for the second process is 3. Further, the order in which the pallets P are transported from the first process machining center M-1 to the second process M-2 or to the pallet stocker 107 is 4. Valen)P/)<The order of delivery to machining center M-1 in the first process is 5
The order of being carried out from the setup table 109 to the first process machining center M-1 or to the pallet stocker 107 is 6. In this way, the request command for the final process is
It is set as a priority, and priority is given from the subsequent process.

In other words, the workpiece that has been processed is immediately transported out,
The aim is to promote continuous workpiece machining and improve system operation.

(3) Next, the specific structure of the present invention will be explained.

FIG. 1 is a control block diagram illustrating the present invention in detail.

In FIG. 1, a central control unit (hereinafter referred to as CPU) 1
The entire FMS line explained in FIG. 2 is connected to 00. Therefore, details of the FMS line will be omitted. In this embodiment, four machining centers, which are machine tools, are used: machining center 102a (MCI-1),
102b (MCI-2) in the first process, machining center 102C (M102C(, 102d (MC2-2)
) is used as the second step.

A keyboard with a screen 111 (referred to as a field terminal in FIG. 2) is connected to the CPU 100 via an input/output device 111a, and an operator uses this keyboard with a screen 111 to carry out pallets on the setup table 109. An input request command is input.

When the order to bring in the gold film stand is issued, Antogame) 4.
5. 6. 7 and 8, and a bit signal is set at AND gate 9. The AND gate 9 is opened by the bit signal, and the ranking data P=1 stored in the ranking data register 1 passes through the AND gate 9 and is output to the OR gate 1.
Further, the ranking data P=1 is sent from the OR gate 9 to the transport vehicle operation program memory 22 via the ranking data selection circuit 22a.

Next, when the second process export request command is issued, AND gate 4
, 5, 6, 7, and 8, respectively. Second
Process import request command is AND gate 5.6.7 and 8
A bit signal is set respectively at , the first process carry-out request command is sent to AND gates 6, 7 and 8, the first process carry-in request command is sent to AND gates 7 and 8, and the setup table carry-out request command is sent to AND gate 8. A bit signal is set at each.

In the AND gate 4, even if the second process carry-out request command is issued while the setup table carry-in request command is issued, the AND gate is not executed.
Gate 4 remains closed and the bit signal cannot pass through. That is, when a setup platform carrier request command is issued, the command is executed with priority. Therefore, when there is a setup table carry-in request command, the order data P is sent from the above-mentioned AND gate 9.
=1 is sent. If there is no setup platform import request command,
When the second process carry-out command is issued as execution of the second priority, the AND gate 4 opens, the focus signal is turned on, and the second process data n=2 is sent from the AND gate 10. The AND gate 5 cannot pass through even if there is a second process carry-in request command while the setup table carry-in request command and the second process carry-out request command are issued. In other words, when there is no upper request command, the second process import request command is
It passes through gate 5 and is put into action as the third dominant ranking.

AND gate 6 is a setup table loading request command.

If the second process carry-out request command and the second process carry-in request command have not been issued, the first process carry-in request command is passed. The AND gate 7 allows the first process carry-in request command to pass if the setup table carry-in request command, the second process carry-out request command, the second process carry-in request command, and the first process carry-out request command have not been issued.

If none of the setup table carry-in request command, second process carry-out request command, second process carry-in request command, first process carry-out request command, and first process carry-in request command is issued, the AND gate 8 executes the setup table carry-out request command. Pass the request directive.

The second process data n=2 is taken into the AND gate 10°11, and the -first process data n=1 is taken into the AND gate 1.
2.13, and further setup table export data n=
o is taken into the AND gate 14 from the setup table carry-out data register 2.

The AND gate 10 opens in response to the second process export request command sent when the above conditions are met, and the second process data n=2 is passed through and taken into the OR gate 15.

The AND gate 11 is opened by a second process carry-in request command, and the second process data n=2 is passed through and taken into the OR gate 16.

The AND gate 12 is opened by the first process export request command, and the first process data n=1 is passed through and taken into the OR gate 15. The AND gate 13 opens in response to the first process import request command, allows the first process data n=1 to pass, and
It is taken into the gate 16. The AND gate 14 is opened in response to a setup table carry-out request command, and the setup table carry-out data n=o is passed through and taken into the off gate 15.

Second process data taken into OR gate 15 n=2
．． First process data n=1 and setup table carry-out data n=
0 is respectively taken into the arithmetic circuit 17. or gate 1
The second process data n = 2 and the first process data n = 1 that were taken into 6 are taken into the arithmetic circuit 18 . Further, the total number of processes N=2 stored in the total process number register 3 is taken into the arithmetic circuit 17 and the arithmetic circuit 18, respectively.

In the arithmetic circuit 17, priority data P=2(N-n)+2
．． n=0.1 and 2 are taken and rank P is 2.
4 and 6 are processed.

In the arithmetic circuit 1B, P=2 (N-n)+3 and N-2, n
=1 and 2 are taken in, and 3 and 5 are processed as the rank P.

One of the ranks P=2, 3, 4, 5 and 6 passes through the OR gate 19 and is transmitted to the carrier operation program memory 22 via the rank data selection circuit 22a, respectively.

In addition, a pallet stocker selection program memory 20 is connected to the CPUI OO, and a pallet stocker selection program memory 20 is connected to the CPUI OO, and the pallet stocker selection program memory 20 is
10 selects a pallet P from the pallet stocker 107 and moves it to the setup table 109 or machining center 102a-
102d. Furthermore, a system operating status file 21 is connected to the CPU 100, and the system operating status file 21 contains the status of the device and the status of the pallet.

Information is filed and managed one by one for each element such as the barrel 1ll&t, work status MCl-1, transport vehicle, etc.

A machining schedule file 23 is also connected to the CPU 100, and the machining schedule file 23 includes machining order,
Data is filed and managed for each pallet magnet 2 part name, 1st process NC data, and 2nd process NC data.

(4) The operation of pallet conveyance processing according to the apparatus of the present invention will be explained based on the flowchart shown in FIG.

In FIG. 4, the apparatus of the present invention is started at the 0th stage, and it is determined at the 0th stage whether or not there is a request for carrying into the setup table.

When the operator inputs a setup request using the screen keyboard 111 at the 0th stage, a request for transport to the setup platform is notified, and at the 0th stage, the setup at the rank l in the transport vehicle operation program memory 22 is performed. The carriage loading operation program is activated and the carriage 110 is moved to the machining centers 102c and 102d.
The pallet is selected from either of the following or the pallet stocker 107, and the pallet is carried to the setup table 109.

If there is no request to enter the setup table 109a at the 0th stage, the 0th stage
The process advances to step 1, and the total number of steps N is set in the counter n (2 in this embodiment).

Further, in the 0th stage, it is determined whether there is a request for carrying out from the NC machine in the n-th process, that is, a request for carrying out from the NC machine in the second process. If there is an unloading request from the second process NC machine at the 0th stage, the transport cart 11 is transferred from the second process machine, that is, the machining center 102C or 102d, at the 0th stage.
0, the pallet P is carried out. If there is no request for unloading from the NC machine in the second process at the 0th stage, the process proceeds to the 0th stage.
In step 1, it is determined whether there is a request to carry the material into the NC machine for the second process. If there is a carry-in request from the second process NC machine at the 0th stage, which is the third order, the pallet P is carried by the transport cart 110 to the second process machine, that is, the machining center 1O2C or 102d at the 0th stage.

If there is no request for transport to the NC machine for the nth process, that is, the second process, at the 0th stage, the process proceeds to the 0th stage, and at the 0th stage, the process number counter n
If it is not equal to l, subtraction processing of n=N-1 is performed in the [phase] stage, and feedbanking is performed to the 0th stage, and the carrying-out and carrying-in operations of the first process are the same as the carrying-out and carrying-out operations of the second process. It will be held in That is, the fourth and fifth ranks are processed.

When the process number counter n=l at the 0th stage, it is determined whether there is a request for unloading from the setup table 109, which is the 6th priority at the 0th stage. If there is a request for carrying out from the setup table 109 at the 0th stage, the pallet P is carried out by the transport cart 110 from the setup table 109 at the 0th stage. If the process ends at the 0th stage without any request for carrying out from the setup table (0th stage), the process ends.

<Effects> In the FMS of a machine tool, the present invention divides a workpiece into multiple processes and processes them sequentially, giving first priority to the request command of the final process for loading and unloading of pallets, and processes the subsequent processes with priority. Because of this, the workpiece that has been machined can be carried out immediately and the next workpiece can be machined as quickly as possible with as little waiting time as possible. Therefore, the processing efficiency and production efficiency of the system are improved by several orders of magnitude compared to conventional FMS processing.

According to the present invention, the operating procedure of the transport vehicle is changed in accordance with the improvement in processing efficiency, which leads to an improvement in the operating efficiency of the transport vehicle.

In addition, by adopting the processing device of the present invention, each N
Since the C machine tool has a characteristic of always having a receiving posture in which it is ready to process the next workpiece, the actual operating rate increases.

Further, according to the present invention, since the operator requests setup or indicates completion depending on the progress status, it is possible to flexibly respond to emergency processing such as interrupt processing.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an iTB explaining the present invention in detail. FIG. 2 is a schematic diagram of an FNS suitable for implementing the present invention. FIG. 3 is an explanatory diagram illustrating the priority order of pallet transport requests, and is a model diagram showing the pallet transport order of the transport vehicle in relation to the pallet stacker, the setup table, and the machining centers of the first process and the second process. FIG. 4 is a flowchart for explaining the present invention in detail. Process...Order data register 2...Setup table unloading data register 3...Total process number register 4.5, 6, 7.8...And gate 9.10, 1
2, 13.14...and gate 15.16.19
...OR gate 17.18...Arithmetic circuit 22...Transportation vehicle operation program memory 100...
・CPU 101... Main control device 102a-1
02d... machining center 103 a ~ 103
d-...NC device 106...Transportation vehicle control panel 107...Bundt stocker 108 a ~ 108 d-PC device 109a...Setup table 110...Transportation vehicle 1
11... Field terminal 9-screen keyboard P... Palette patent applicant Hitachi Seiki Co., Ltd. (i::, 1 - (1, P Figure 3, Figure 4)

Claims (1)

[Claims] In an FMS that has a central control unit, there are a group of machine tools that are arranged to sequentially process workpieces by dividing them into multiple steps, a pallet stocker that stores pallets, and a setup station that installs workpieces on pallets. ,
a conveying device that moves between the setup station, the pallet stocker, and the machine tool group to transfer and deliver pallets; an input/output device that inputs and outputs requests from the setup station; the input/output device and the machine tool; A request command priority processing means is provided for giving priority order processing means for request commands such that the operation procedure of the conveying device is given first priority to the request command for the final process and the pallets are sequentially conveyed in order of priority from subsequent processes. A multi-step processing device for FMS characterized by: