JPH04123106A - Controller for nc machine tool - Google Patents

Abstract

PURPOSE:To shorten the cycle time for working by providing a storage means for storing a working program transferred from a host computer, and a commanding means for executing a working operation command, based on the working program stored in the storage means at the time of repeat working. CONSTITUTION:An NC program transferred from a host computer is stored in a RAM 33 of a punch press machine side control part. Subsequently, at the time to executing repeatedly the same working, the working operation is executed, based on the NC program stored in this RAM 33. Accordingly, it becomes unnecessary to transfer repeatedly the same NC program to a punch press machine from the host computer as conventional. In such a way, the cycle time for working can be shortened.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a control device, and particularly to a control device for an NC machine tool that performs machining by processing machining programs that are sequentially transferred block by block from a host computer. .

[Conventional technology]

Recently, with the spread of FMS (Flexible Manufacturing Systems), DNC-controlled machining lines have been adopted in which multiple NC machine tools and their peripheral devices are operated by commands from a host computer. For example, a DNC-controlled plate processing line that processes plate materials includes a plate processing machine such as a punch press machine, and a plate conveyance device that transports the plate material to the punch press machine. The punch press machine and the plate material conveying device are controlled by instructions from the host computer.

In such a plate processing line, the processing program (
If the NC program (NC program) is long, the NC program is sequentially transferred block by block from the host computer to the punch press machine, and the punch press machine performs a processing operation for each block of the transferred NC program.

[Problem to be solved by the invention]

When a machining operation is repeatedly performed in the plate processing line, an NC program is repeatedly transferred from the host computer to the punch press machine each time the machining operation is performed. Therefore, when performing the same machining operation repeatedly, it becomes necessary to repeatedly transfer the same NC program, resulting in a problem that the machining cycle time is increased by the program transfer time.

The purpose of the present invention is to reduce the cycle time of machining.
C. The purpose of the present invention is to provide a control device for a machine tool.

[Means to solve the problem]

A control device according to the present invention is a control device for an NC machine tool that performs machining by processing a machining program sequentially transferred block by block from a host computer, and includes a storage means and a command means. The storage means is a means for storing the machining program transferred from the host computer.

The command means is a means for issuing a machining operation command based on a machining program stored in the storage means during repeated machining.

[Effect]

In the control device according to the present invention, machining programs transferred block by block from a host computer are sequentially processed. In this case, the storage means stores the machining program transferred from the host computer. and,
The command means issues a machining operation command based on a machining program stored in the storage means during repeated machining.

This eliminates the need to wait for a machining program to be transferred from a host computer when the same machining is performed repeatedly, and the machining cycle time can be shortened.

〔Example〕

5A and 5B show a plate processing line in which an embodiment of the present invention is adopted.

This plate material processing line includes a punch press machine 1 located in the center, a material traverser 2 that supplies raw material W to the punch press machine 1, and a processed plate material processed by the punch press machine 1 to be carried out. It is equipped with a product stand 3 with a lifter.

The punch press machine 1 is a machine tool that performs processing such as drilling holes in a material plate W, and includes a work table 11 on which the material plate W is placed, and a workpiece for gripping the material plate W on the work table 11. It has a holder 12 and the like. Furthermore, a rail 4 is installed horizontally above the plate processing line. A loader 6 and an unloader 8 are provided on the rail 4. The loader 6 and the unloader 8 are each provided movably on the rail 4. Further, the loader 6 has a vacuum pad 5 at its lower part for sucking and holding the material plate W.

The unloader 8 has a gripper 7 at its lower part for gripping one end of the processed plate material. Product stand with lifter 3
A moving roller device 9 is provided above the machine for placing the processed plate material and for dropping the processed plate material onto the product stand 3 below. Note that the rail 4 is connected to the support post 1.
Supported by 0. Further, auxiliary tables 13 and 14 are arranged on both sides of the punch press machine l.

This plate processing line is controlled by a host computer. FIG. 3 shows the control section of this host computer. In FIG. 3, this control section 20
It consists of LI, ROM, RAM, etc. Control part 2
0 has a keyboard 21, a tape reader 22 . and another input section to which an external storage medium such as a floppy disk is connected. The control unit 20 also includes a punch press machine l.

Loader 6, unloader 8. and other output sections are connected.

On the other hand, the punch press machine 1 has a control section 30 as shown in FIG. The control unit 30 controls the CPLI 31. R.O.
It is equipped with a microcomputer consisting of M32, RAM33, etc. A drive unit 35 and other input/output units are connected to the r7o boat 34 of the control unit 30.

The above-mentioned plate material processing line is controlled by control units 20 and 30. Hereinafter, control operations by the control units 30 and 20 will be explained using FIG. 1 and FIG. 2, respectively.

Note that the control of the loader 6 and unloader 8 is the same as the conventional one, so the explanation will be omitted here. FIG. 1 shows the control flow of the punch press machine side control section 30, and FIG. 2 shows the control flow of the host computer side control section 20.

On the host computer side, first, in step Sl, initial settings such as setting the loader 6 and unloader 8 to initial positions are performed. On the other hand, in the punch press machine side control section, initial settings such as setting the work holder 12 to the initial position are performed in step PI.

Next, in step S2, the host computer waits for a work start command. If a work start command is input from the keyboard 21, the process moves to step S3. In step S3, the NC program is read from an external storage medium such as the tape reader 22 or a floppy disk.
In step 4, a succession of command steps is performed. In step S5, it is determined whether the read command step is a board material carry-in command. Otherwise, proceed to step S6,
It is determined whether the read instruction step is a plate processing instruction. Similarly, in step S7, it is determined whether or not the read command step is a board material unloading command, and in step S8, it is determined whether or not the read command step is a command to perform other processing. to decide. Then, in step S9, it is determined whether all command steps of the NC program have been processed. If there are still command steps remaining, the process returns to step S4 and the next command step is read.

If the command step read in step S4 is determined to be a board material carry-in command, the program moves from step S5 to step 310. Step SIO
Now, a loading process is performed in which the loader 6 is driven to load the 3Fdt plate material W onto the work table 11 of the punch press machine 1.

If the command step read in step S4 is a plate processing command, the program moves from step S6 to step S6A. In step S6A, it is determined whether the machining program is the same as the previous one. Since this is the first processing, the process moves to step Sll. In step Sll, one block of the NC program is transferred to the punch press machine.

On the other hand, on the punch press machine side, in step P2,
Waiting for NC program transfer from host computer. Once the block of the NC program is transferred from the host computer, the process moves to step P3. In step P3, one block of the NC program is stored in the RAM 33.
Next, in step P4, the word is read from the stored block. In step P5, the processing operation according to the read word is performed, for example, the work holder 12 performs processing on the plate material. Next, in step P6, a determination is made as to whether or not the block includes a word instructing an end of program. If there is no word commanding end of program, the process moves to step P7. In step P7, it is determined whether the read word is an end-op block. If it is not an end of block, the process returns to step P4 and the next word is read. If it is determined in step P7 that it is an end of block, the process moves to step P8. In step P8, the host computer
After processing in step P8, which requests transfer of the next block of the program, the process returns to step P2 and waits for program transfer from the host computer.

On the other hand, the host computer waits for a signal from the punch press machine in steps S12 and S13 after processing in step S11.

As mentioned above, if there is a block transfer request from the punch press machine side, the process returns from step S13 to step S11.
Transfer the next block of the NC program to the punch press machine.

Also, on the punch press machine side, in step P2, N
It is waiting for the next block transfer of the C program, and when the transfer is received, it moves to step P3.

Thereafter, the processes of steps P4 to P7 are repeatedly executed in the same manner as described above.

In the punch press machine, when an end of program is detected, the program moves from step P6 to step P20. In step P20, a signal indicating that the end of program has been detected is sent to the host computer, and the process moves to step P9. The host computer side receives the signal sent from the punch press machine side in step P20, and the program moves from step S12 to step S7.

Next, if the command step read in step S4 is again a plate machining command, the program moves from step S6 to step S6A. Then, in the same way as the previous time, it is determined in step S6A whether or not it is the same machining program as the previous time.

If it is determined that the machining program is not the same as the previous one, the process moves to step Sll, and the NC is set on the punch press machine side.
Transfer one block of the program. Furthermore, the punch press machine waits for the transfer of the NC program from the host computer in step P9, and upon receiving this transfer, proceeds to step P3. Thereafter, the processes of steps P3 to P8 are executed in the same manner as last time.

On the other hand, if it is determined in step S6A that the machining program is the same as the previous machining program, the process moves to step S6B. In step 36B, the punch press machine side is notified that the machining program is the same as the previous one. Next, step S
6C waits for an end of program signal from the punch press machine.

Furthermore, the punch press machine side is waiting for a notification from the host computer side in step PIO that the process is the same as the previous one. If there is a notification that the processing is the same as the previous one, the process moves to step P12. In step PL2, the first block of the NC program stored in the RAM 33 during the previous machining is read out. Next, in step P13, words are read from the read bronch. Next, in step P14,
9. Next, in step P15, it is determined whether or not the word includes an end of program.

If it is determined that it is not included, the process moves to step P16. In step P16, it is determined whether or not it is an end-of-blotter. If it is not an end-of-block, the process returns to step P13 and the processes from step PL3 to step P15 are repeated. If it is determined that it is an end-of-block in step P16, the process returns to step P12 again and the process in the RAM 33 is repeated. The next one block of the NC program stored in is read out.

Thereafter, the processes from step P13 to step PI6 are repeated in the same manner.

In step P15, if an end of program is detected, the process moves to step P15A. In step P15A, a signal indicating that the end of program has been detected is sent to the host computer. After processing, the program returns to step P9 again.

On the other hand, in step S60, the host computer waits for an end-op program signal from the punch press machine. When the signal from the punch press machine side is received, the program moves to step S7.

Further, if it is determined that the step read in step S4 is a board material unloading command, step S7
The process then moves to step S14. In step S14,
Carry out the process of transporting board materials. In this case, the unloader 8 is driven to transport the processed plate material on the punch press machine 1 onto the moving roller device 9. The processed plate material placed on the moving port device 9 is dropped onto the product stand 3 below.

Next, if the instruction step read in step S4 is a step for instructing other processing, the process moves from step S8 to step S15. Step S
At step 15, processing according to the command is performed. When reading of all steps is completed, the determination in step S9 becomes Yes, and this program ends.

In this embodiment, the NC program transferred from the host computer is stored in the RAM 33 of the control section of the punch press machine. When the same machining is repeated, the machining operation is performed based on the NC program stored in the RAM 33. therefore,
It is no longer necessary to repeatedly transfer the same NC program from the host computer to the punch press machine as in the past, thereby shortening the processing cycle time.

[Other Examples]

In the embodiments described above, a case where the present invention is applied to a punch press machine has been described, but the present invention can be similarly applied to other sheet processing machines such as a shearing machine. Furthermore, the application of the present invention is not limited to plate processing machines, but may be applied to other machine tools.

〔Effect of the invention〕

A control device for an NC machine tool according to the present invention includes a storage means and a command means as described above. Therefore, according to the present invention, the processing cycle time can be shortened.

[Brief explanation of drawings]

FIG. 1 is a control flowchart of a punch press machine in which an embodiment of the present invention is adopted, FIG. 2 is a control flowchart of a plate processing line in which the punch press machine is adopted, and FIG.
4 is a schematic block diagram of the control section of the punch press machine, FIG. 5A is a schematic plan view of the plate processing line, and FIG. 5B is a schematic block diagram of the control section of the host computer that controls the plate processing line. The figure is a schematic front view thereof. 1... Punch press machine, 20... Host computer control section, 30... Punch press machine control section, 3I...
・CPU, 32...ROM, 33...RAM.

Claims (1)

[Claims] (1) A control device for an NC machine tool that performs machining by processing machining programs sequentially transferred in blocks from a host computer, comprising: a storage means for storing the machining programs transferred from the host computer; and a repeating step. A control device for an NC machine tool, comprising: command means for issuing a machining operation command based on a machining program stored in the storage means during machining.