JPS63265305A - Program restarting system - Google Patents

Abstract

PURPOSE:To restart the working from a desired block by moving back a tool based on the data stored in a reverse function memory by a reverse command and restarting the working at a position which is released by the release of the reverse command. CONSTITUTION:When a program restart command is received, a CPU 2 reads an NC program stored in a nonvolatile memory 5 from the head of the program for each block and converts the program into an executing block form to store it into a reverse memory RAM 4. At the same time, the CPU 2 stores the specific order of the block that is converted into an executing form. Then a tool is moved to the block restarting position when the coincidence is obtained between the block number designated as a restart point and the count value of a block counter. In this case, the tool is moved back from the restart position along a route designated by a program based on the executing block form data on the block preceding the one stored in the RAM 4 and to be restarted as long as a reverse command is supplied via a reverse switch of a control board 7. When the tool reaches a desired position, the reverse state is released and the working is restarted at said position.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a program restart method in a numerical control system.

Conventional technology When a tool breaks during machining and machining is interrupted and then restarted, or when the power is turned off midway through machining and then restart machining, conventionally, the program restart function is used to restart the program from the block specified by the operator. was being restarted.

This conventional program restart method, when converting an NC program into an execution block format, sets the first block to 1 and increments the block counter by 1 each time a block to be processed appears. The blocks are stored in a block counter.

As a result, when program execution is interrupted, the number of blocks executed until the interruption is displayed based on the block counter, and the operator can use the program restart function to block this block or the block before this block. When you specify a number and enter a program restart command, as mentioned above, each block is read from the beginning of the NC program and the block counter is incremented, so the value of the block counter becomes the value of the specified number. Until then, no machining was performed, and when the specified block was reached, the tool was moved to the restart position, and machining was resumed from the specified block.

On the other hand, in numerical control devices, a reverse function is known that allows the tool to be returned along the path it has passed from the position currently being processed. This reverse function stores data in the converted execution block format in the reverse function memory when one block is read from the NC program and converts it into an execution block format during program execution. When the command signal is input, the tool is caused to move backward along the path it has passed based on the data stored in the reverse function memory until the reverse command signal disappears, and when the reverse command signal disappears, Machining is restarted from that position. However, this reverse function was not available when the program was restarted.

Problems to be Solved by the Invention As mentioned above, in another aspect of the conventional program restart, a block number to be restarted is designated and machining is restarted from the designated block. However, if the NC program includes a fixed cycle or processing using the mirror image function, it is difficult to judge how far before the currently displayed block number the machining position to restart is. SUMMARY OF THE INVENTION An object of the present invention is to provide a program restart method that allows a reverse function to be used even when a program is restarted, and allows machining to be restarted from a desired block.

Means for Solving the Problems According to the method of the present invention, when a program restart command is input,
Read each block from the beginning of the NC program, convert it into executable format data, store the converted data in the reverse function memory, and increment the block counter by 1 every time one block is stored, and write the program to which the block counter is specified. When the restart block number is reached, the tool position is moved to the program restart coordinate position, and if there is no reverse command, the program is restarted from the specified block,
When a reverse command is issued, the tool is moved backward based on the data stored in the reverse function memory, and when the reverse command is released, machining is restarted from the released position, thereby solving the above problem. Settled.

When a working program restart command is input, each block is read from the beginning of the NC program, converted into an execution block format, and the converted data is stored in the reverse function memory. At the same time, "1" is added to the block counter, and the number of blocks converted to execution block format,
That is, it stores the number of blocks from the beginning of the NC program that have been converted into an executable format. When the block number specified as the restart position matches the value of the block counter, the block converted into the execution block format is the block to be restarted, and the tool is moved to the block restart position.

At that time, if a reverse command has been inputted using a reverse switch or the like, the tool starts from the restart position based on the execution block format data of the block that is stored in the reverse function memory and is earlier than the block to be restarted. to move backwards according to the path specified by the program. When the operator releases the reverse when the tool reaches the desired position, machining will resume from the position where the reverse command was released.

On the other hand, when the tool is moved to the start position of the specified restart block, if no reverse command is input, machining is restarted from that position.

Embodiment FIG. 2 is a block diagram of main parts of a numerical control device implementing an embodiment of the present invention. As in the conventional case, the numerical control device 1 includes a microcomputer (hereinafter referred to as CPU) 2 and the CPU.
2 and R for storing management programs, etc. connected by bus 9.
OM3, RAM4 used as temporary data storage and reverse function memory for storing execution block format data, non-volatile memory 5 for storing NC programs and various parameters, manual data input device with CRT display (hereinafter referred to as , C, RT/MDI) 6, a machine operation panel 7 having a program restart switch, a reverse switch, etc. to be described later, and a servo interface 8 connected to various servo circuits of machines such as machine tools.

FIG. 1 shows a flowchart of program restart processing in this embodiment, and the operation of this embodiment will be explained with reference to this flowchart.

When the tool is damaged, or when the power is once turned off and the program is restarted, first turn on the program restart switch on the machine operation panel 7, and if the reverse function is also used, turn on the reverse switch as well. and,
NC stored in the non-volatile memory 5 as shown in FIG.
If machining is performed by a program, set it to memory mode and operate the CRT/MD I 6 soft key to read from the beginning of the NC program. into the tape reader and set it to tape mode). Next, by operating the soft keys and numeric keypad of the CRT/MD I 6, set the block number of the block to be restarted and input a program restart command.The CPU 2 starts the process shown in FIG.・Set counter C to “0”
1) from the NC program.
Read the block and convert the block to execution block format (step 82). Next, the data in the converted execution block format is stored in the reverse function memory location in the RAM 4 (step S3), and it is determined whether the value of the block counter C matches the block number of the restart block set. In step S5), if the set block number has not been reached, the processes from step 82 onwards are repeated again.

That is, the program is read one block at a time until the specified restart block is reached, and converted into an execution block format.
Riverne l! Store it in the I function memory. Then, when the value of block counter C reaches the set block number,
Move to step S6 and display the program restart screen on the CRT.
/Display on the CR1 screen of MD I 6 (step 86
). Therefore, the operator turns off the program restart switch and selects the position to start machining displayed on the CRT screen.
When the tool moves to the machining restart position from the distance from the current position to the machining restart position, check to see if it will collide with anything other than the workpiece Y. If it collides, manually move the tool to a position where it will not collide. , press the cycle start button.

On the other hand, the CPU 2 determines whether a cycle start signal has been input (step S7), and when the cycle start signal is input, it determines whether the program restart switch is turned off (step S8). If the program resume switch is not turned off, the CRT
A warning message is displayed on the screen and an alarm is issued (step 89), and the process returns to step S7. When the cycle start signal is input and the program restart switch is off, the tool is moved to the machining restart position by dry run (step 510), and then it is determined whether the reverse switch is on. If it is on, reverse processing is started in the same way as conventional reverse function processing, and the tool is moved to the machining path based on the execution block format data of the block before the machining restart position stored in the reverse function memory. along the same line (step 513).

Then, when the operator observes the position of the tool and turns off the reverse switch when the tool reaches the desired position, machining starts from that position in the direction specified by the program command. This reverse processing is no different from conventional reverse processing. If the reverse switch is not turned on in step 811, the program is restarted from the block designated from the machining restart position, and machining is started (step 512).

Effects of the Invention As described above, in the present invention, the reverse function can also be used when restarting the program, so after the tool has moved to the machining restart position by the program restart function, the tool can be moved to the machining path by the reverse command. Since the reverse command is stopped at the desired position and machining is restarted from that position, when the program is restarted, machining can be restarted from the desired position and after confirming the tool position. Therefore, the program can be restarted more safely.

[Brief explanation of the drawing]

FIG. 1 is a flowchart of program restart processing according to an embodiment of the present invention, and FIG. 2 is a block diagram of main parts of a numerical control device implementing the same embodiment. DESCRIPTION OF SYMBOLS 1... Numerical control device, 2... Microcomputer, 3... ROM, 4... RAM, 5... Non-volatile memory, 6... Manual data input device with CRT display device, 7... ... Machine operation panel, 8... Servo interface, 9... Bus. Figure 2

Claims (1)

[Claims] In the program restart method of the numerical control method, in response to the program restart command, the numerical control device reads each block from the beginning of the NC program and converts it into executable format data, stores the converted data in the reverse function memory, and sets the block counter to 1. Each time a block is stored, it is incremented by 1, and when the block counter reaches the specified program restart block number, the tool position is moved to the program restart coordinate position, and if there is no reverse command, the program is started from the specified block. A program restart method in which when a reverse command is issued, the tool is moved backward based on the data stored in the reverse function memory, and when the reverse command is released, machining is restarted from the released position.