JP2676512B2 - Program restart method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program restart method in a numerical control method. Conventional technology When a tool is damaged during machining and machining is interrupted and then restarted, or when the power is turned off once during machining and then machining is restarted, the program is conventionally programmed from the block specified by the operator using the program restart function. Was restarting. When the NC program is converted into the execution block format, this conventional method of restarting the program sets the first block to 1 and increments the block counter by 1 each time a block to be processed is displayed. The block is stored in the block counter. As a result, when the execution of the program is interrupted, the number of blocks executed up to the interruption is displayed based on the block counter, so that the operator can block this block or a block before this block in the program restart function. When a program restart command is input by specifying a number, as described above, the block counter is incremented by reading from the beginning of the NC program one block at a time, and the block counter is incremented. Until then, the tool was moved to the restart position when the specified block was reached, and processing was restarted from the specified block. On the other hand, in the numerical control device, there is known a reverse function capable of returning the tool from the position currently being machined along the path which has been used so far. This reverse function
When the program is executed and one block is read from the NC program and converted into the execution block format, the converted execution block format data is stored in the memory for the reverse function, and a reverse command signal is input from the outside during machining. Then, based on the data stored in the memory for the reverse function until the reverse command signal disappears, the tool is moved backward along the path that has passed up to now, and when the reverse signal disappears, machining is performed again from that position. Is to be restarted. However, this reverse function could not be used when the program was restarted. Problems to be Solved by the Invention As described above, in the conventional program restart function, the block number to be restarted is specified, and the processing is restarted from the specified block. However, if the NC program included a fixed cycle or processing by the mirror image function, it was difficult to determine how far back the machining position to be restarted was from the currently displayed block number. An object of the present invention is to provide a program resuming method that enables the reverse function to be used even when resuming a program and enables resuming processing from a desired block. Means for Solving the Problems According to the method of the present invention, when a program restart command is input, it is read from the beginning of the NC program for each block and converted into execution form data, and the execution form data is stored in the reverse function memory. In addition, the block counter is incremented by 1 each time it is stored in one block, and when the block counter reaches the designated 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 restarted from the instructed block to start machining. When there is a reverse command, the tool is moved backward based on the data stored in the memory for the reverse function, and when the reverse command is released, the released position The problem was solved by configuring the processing to be restarted. When a work program restart command is input, it is read block by block from the beginning of the NC program, converted into the execution block format, and the converted data is stored in the reverse function memory. Along with that, the number of blocks converted to the execution block format by adding "1" to the block counter,
That is, the number of blocks from the head of the NC program converted to the execution format is stored. Then, when the block number designated as the restart position and the value of the block counter match, the block converted into the execution block format is the block to be restarted at that time, so the tool is moved to the block restart position. At that time, if a reverse command is input by a reverse switch or the like, the tool is based on the execution block format data of the block before the block to be restarted stored in the reverse function memory from the restart position. Reverses along the path specified by the program. If the operator releases the reverse when the tool reaches the desired position, the machining is restarted from the position where the reverse command is released. On the other hand, when the tool is moved to the designated start position of the restart block and the reverse command is not input, the machining is restarted from that position. Second Embodiment FIG. 2 is a block diagram of a main part of a numerical control device for carrying out 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, the CPU 2 and a bus 9. ROM3 that stores the management program etc. connected by
RAM4 used as a memory for the reverse function to temporarily store data and store execution block format data,
Non-volatile memory 5 for storing NC programs and various parameters, manual data input device with CRT display device (CRT
/ MDI) 6, a machine operation panel 7 having a program restart switch, a reverse switch, etc., which will be described later, and a servo interface 8 connected to various servo circuits of machines such as machine tools. FIG. 1 shows a flow chart of the program restart processing in the embodiment, and the operation of this embodiment will be described together with the flow chart. When the tool is damaged, or when the power is once turned off and the program is restarted, first, the program restart switch of the machine operation panel 7 is turned on, and when the reverse function is also used, the reverse switch is also turned on. Then, it is stored in the non-volatile memory 5 as shown in FIG.
If you are processing by NC program, set to memory mode and operate the soft key of CRT / MDI6 to set to read from the beginning of NC program. Set to tape reader, set to tape mode). Next, CRT / MDI6
When the block number of the block to be restarted is set and the program restart command is input by operating the soft key and numeric key of, the CPU2 starts the process of FIG. 1 and first sets the block counter C to "0". Reset (step S1),
One block is read from the NC program and the block is converted into the execution block format (step S2). Next, the converted execution block format data is stored in the reverse function memory location in the RAM 4 (step S3), the value of the counter C is incremented (step S4), and then the value of the block counter C is set. It is determined whether or not the block number of the restarted block is the same (step S5). If the set block number has not been reached, the process from step S2 is repeated again. That is, the program is read block by block until the designated restart block is reached, converted into the execution block format, and stored in the reverse function memory. When the value of the block counter C reaches the set block number,
Move to step S6 and change the screen of program restart to CRT / MDI6
Is displayed on the CRT screen (step S6). Therefore, the operator turns off the program restart switch, and when the tool moves to the machining restart position from the position where the machining is started on the CRT screen and the distance from the current position to the position where the machining is restarted, the work Y Check if it does not hit, and if it hits, manually move the tool to a position where it does not hit and press the cycle start button. On the other hand, the CPU 2 determines whether or not the cycle start signal is input (step S7), and when the cycle start signal is input, determines whether or not the program restart switch is off (step S8). If the program restart switch is not turned off, an alarm message is displayed on the CRT screen to give an alarm (step S9), and the process proceeds to step S7 again. Then, 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 S10), then it is judged whether the reverse switch is on or not. If it is on, the reverse processing is started in the same manner as the conventional reverse function processing, and based on the execution block format data of the block before the machining restart position stored in the reverse function memory,
The tool is moved backward along the machining path (step S13). When the operator observes the position of the tool and turns off the reverse switch when the tool reaches the desired position, machining is started from that position in the direction of the program command according to the program. This reverse processing is the same as the conventional reverse processing. If the reverse switch is not turned on in step S11, the program is restarted from the block designated from the machining restart position and machining is started (step S12). As described above, according to the present invention, the reverse function can be used when the program is restarted. Therefore, after the tool is moved to the machining restart position by the program restart function, the tool is moved to the machining path by the reverse command. It is possible to move backward along the line, stop the reverse command at the desired position, and restart machining from that position.Therefore, the processing of the fixed cycle mirror image function is included in the program, and it is displayed when machining is interrupted. Even if it is difficult to determine the block position where you want to restart machining from the existing block, you can easily detect the desired program restart position by the program restart method using this reverse function, and the tool position. You can restart the processing after confirming. Therefore, the program can be restarted more safely.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart of a program restart process according to an embodiment of the present invention, and FIG. 2 is a block diagram of a main part of a numerical controller for implementing the embodiment. 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.

   ────────────────────────────────────────────────── ─── Continuation of front page    (56) References JP-A-62-77610 (JP, A)                 JP-A-58-186805 (JP, A)

Claims (1)

(57) [Claims] In the program restart method in the numerical control method, the numerical control device converts each block from the beginning of the NC program into the execution format data by the program restart command, stores the execution format data in the memory for the reverse function, and the block counter. Is incremented by 1, and when the value of 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 restarted from the specified block. When the reverse instruction is released, the tool is moved backward based on the data stored in the memory for the reverse function, and when the reverse instruction is released, the machining is resumed from the released position.