JP2005108205A - Numerical control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform checking of a machining program, and actual machining. <P>SOLUTION: In the process background of machining by performing the machining program and by driving each shaft, the checking process of the machining program is performed at high speed. Only when a set corner R and chamfering block insertion conditions is met, the corner R and chamfering block is inserted into the joint of blocks (203, 204). Forward blocks and inserted blocks are executed at maximum feeding speed and at maximum acceleration, and format checking, stroke limit checking and interference checking are performed (205). In case of abnormality, an alarm flag is made to be '1' and after revising the program, it is made to be '0' (207-210). The checking actions are performed after returning to a desired program position (211-213, 201). In the actual foreground machining process, if the alarm flag is '1', a single block stop is implemented and re-execution is initialized by a re-start command. Since the actual machining and program checking are performed in parallel, it would be more efficient. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a numerical control device, and more particularly to a numerical control device that performs a program check.

When machining is actually performed by a machine tool controlled by a numerical control device, the machining program is checked by checking the format of the machining program, checking the stroke limit (checking the approach to the entry prohibited area), checking for interference with tools and machine structures, etc. After confirming whether or not can be executed correctly, and confirming that it can be executed correctly, the machining program is executed to perform actual machining.
Regarding this program check in the numerical control device, other than the above-described program check, no publicly known document describing an invention related to the present invention could be found.

In the method of performing actual machining after performing the program check for format check, stroke limit check, and interference check for the machining program that has been performed conventionally, the actual machining is started until the machining program confirmation is completed. Work efficiency is poor.
Therefore, an object of the present invention is to provide a numerical control apparatus that can efficiently execute program checking and actual machining.

The invention according to claim 1 of the present application is a numerical control device that drives and controls a controlled object according to a program, executes the program, and outputs a foreground program execution unit that outputs a drive command to the controlled object; The program is executed without outputting a drive command to the object to be controlled in parallel with the drive control process, and a background program execution means comprising a program check means for checking a program abnormality, and the background When a program abnormality is detected by the program execution means, a means for storing the abnormality corresponding to the block in which the abnormality is detected, and a block before the program abnormality is stored during the program execution by the foreground program execution means Means for stopping at the end point, and It was to perform at a high speed in the background processing a click.
In the invention according to claim 2, the program execution by the background program execution means is further performed at the maximum feed speed and the maximum adjustment time constant. According to a third aspect of the present invention, the checking performed by the program checking means is a machining program format check, an entry check into an entry prohibited area, and an interference check program abnormality check.

  According to a fourth aspect of the invention, the background program execution means inserts a corner R and a chamfer block between the blocks and executes the program, and the program check means checks the program based on the execution. To do. The invention according to claim 5 also executes the corner R and the chamfer block inserted when executing the program for driving and controlling the control object executed in the foreground process. The invention according to claim 6 is provided with an editing means for enabling editing of the program when a program abnormality is detected by the program checking means, and storing in the storage means when the editing of the program is completed by the editing means. A means for erasing the programmed abnormality is provided. Further, the invention according to claim 7 is provided with a specifying means for specifying an arbitrary block of the program, and after the program is corrected by the editing means, the program is executed by the background program executing means from the block specified by the specifying means. Was executed and the program check was resumed.

  Since the checking and confirmation of the machining program and the actual machining can be performed in parallel, the time required only for checking and confirming the conventional machining program can be shortened and the work efficiency can be improved. Even if an alarm is generated due to a program error, the program can be corrected by the program editing means without affecting the actual machining or even if the actual machining stops, the program can be continued after the modification. Therefore, the work can be easily and efficiently proceeded.

  FIG. 1 is a principal block diagram of a numerical controller 10 according to an embodiment of the present invention. The CPU 11 is a processor that controls the numerical controller 10 as a whole. The CPU 11 reads out a system program stored in the ROM 12 via the bus 19 and controls the entire numerical control device according to the system program. The RAM 13 is input by an operator via a display / manual input means unit 20 comprising temporary calculation data, display data, a display composed of CRT, liquid crystal, etc. and manual input means composed of a keyboard or the like. Various data are stored. The CMOS memory 14 is configured as a non-volatile memory that is backed up by a battery (not shown) and that retains the storage state even when the power of the numerical controller 10 is turned off. In the CMOS memory 14, a machining program read via the interface 15, a machining program input via the display / manual input means unit 20, and the like are stored. The ROM 12 stores in advance various editing programs required for creating and editing a machining program and various system programs for performing foreground processing and background processing described later.

  The interface 15 enables connection between the numerical controller 10 and an external device. The PMC (programmable machine controller) 16 is a sequence program built in the numerical controller 10, and attaches the I / O unit 17 to an auxiliary device of a machine tool to be controlled (for example, an actuator such as a robot hand for tool change). Through which signals are output and controlled. In addition, it receives signals from various switches on the operation panel provided on the machine tool main body, which is a control object controlled by the numerical control device, performs necessary signal processing, and then passes them to the CPU 11. The axis control circuits 30 to 32 for each axis receive the movement command amount for each axis from the CPU 11 and output the command for each axis to the servo amplifiers 40 to 42. In response to this command, the servo amplifiers 40 to 42 drive the servo motors 50 to 52 of each axis of the machine (control target). The servo motors 50 to 52 of each axis have a built-in position / speed detector, and a position / speed feedback signal from the position / speed detector is fed back to the axis control circuits 30 to 32 to perform position / speed feedback control. . In FIG. 1, the position / speed feedback is omitted.

  The spindle control circuit 60 receives a spindle rotation command and outputs a spindle speed signal to the spindle amplifier 61. The spindle amplifier 61 receives the spindle speed signal and rotates the spindle motor 62 at the commanded rotational speed. The position coder 63 feeds back a feedback pulse to the spindle control circuit 60 in synchronization with the rotation of the spindle motor 62 to perform speed control.

  The configuration of the numerical control device described above is the same as the configuration of the conventional numerical control device. The difference is that, as will be described later, a normal machining program is executed in the foreground processing, and each axis control circuit 30 to The movement command is distributed to 32, the servo motors 50 to 52 are driven, and background processing is performed, and the machining program execution process that performs only numerical processing is performed at high speed without outputting the movement command to each axis. Is a point.

  FIG. 2 is a flowchart of processing executed in the foreground, and FIG. 3 is a flowchart of background processing executed simultaneously with the foreground processing. The foreground process shown in FIG. 2 is the same as the normal machining program process. In the background process, the machining program is executed at the maximum feed speed and the maximum acceleration of the machine controlled by the numerical control device 10, and the movement command to each axis obtained by executing the machining program is not output. Only numerical processing is performed and a program check is performed.

  When a machining program execution start command is input to the numerical control device 10, the CPU 11 starts the process shown in FIG. 2 in the foreground, and starts the process shown in FIG. 3 in the background. First, background processing will be described. In addition, the stroke limit of each axis is set in advance according to the machine tool, and for the interference check, for example, an interference region such as a tool or a machine structure is set as a parameter. Further, as described later, the corner R and chamfer block insertion conditions are also set with parameters.

  This background processing is performed at high speed. The first block of the machining program is read and stored in the register Re1 (step 200), and the storage content of the register Re1 is stored in the register Re2 (step 201). The next block is read out and stored in the register Re1 (step 202). Next, it is determined from the contents of the commands stored in the registers Re1 and Re2 whether or not the corner R and chamfer block insertion conditions set in advance are met (step 203). For example, the condition for inserting the corner R and the chamfer block is set as a parameter in the case where the corner R and the chamfer block are inserted between the linear movement command and the block of the linear movement command as is conventionally done. Keep it.

Then, it is determined whether or not the condition set by this parameter is met. If the condition is met, a corner R and a chamfer block are inserted between the blocks stored in the registers Re1 and Re2 (step 204). In addition to executing the block command stored in the register Re2, the inserted corner R and chamfer block are also executed, and the machining program format check, stroke limit check, and interference check are performed (step 205). If it is determined in step 203 whether or not the condition set by the parameter is met, the process proceeds to step 205 without inserting the corner R and the chamfer block, and the block command stored in the register Re2 is designated. Execute and check program. In executing the program in step 205, the machining program is executed at the maximum feed speed and the maximum acceleration ignoring the commanded feed speed. This execution determines whether the machining program format is different and is not a program error, or whether an alarm has occurred whether each axis movement position obtained by the program execution exceeds the stroke limit (step 206), and there is no format error. If each axis movement position does not exceed the stroke limit, no alarm is generated and the process proceeds to step 214. If an alarm has occurred, the alarm flag is set to “1” in the memory corresponding to the block (the block stored in the register Re2), and the program abnormality is stored (step 207). Then, the program can be edited by the operator (step 208). When the operator corrects the program abnormality via the display / manual input means unit 20 and a program correction completion command is input (step 209), the stored alarm flag is reset to "0" (step 210). ). When the operator returns to the desired machining program check position and inputs a program check restart command (steps 211 and 212), the CPU 11 stores the first block of the returned program check position in the register Re1 ( In step 213), it is determined whether the program is finished (step 214). If not finished, the process returns to step 201, and the processing from step 201 onward is executed.
As described above, in the background processing, the machining program has the maximum feed speed and maximum acceleration, and is not distributed to the movement commands for each axis. For example, the alarm flag is set to “1”, and when the program correction is completed, the alarm flag is reset to “0”.

On the other hand, in the foreground, as shown in FIG. Read the block (step 100), determine whether the alarm flag is set to "1" for the block (step 101), and if not set to "1", execute the block and execute each axis The movement command is distributed to the control circuits 30 to 32, and the servo motors 50 to 52 of each axis are driven (step 102). Then, it is determined whether or not the program is finished (step 103). When it is detected in step 101 that the alarm flag is “1”, single block stop is performed without executing the block read in step 100 (step 104). Hereinafter, this stop state is maintained until a restart command is input.
Note that the corner R and the chamfering block inserted in the background processing are also implemented as processing program blocks in this foreground. In this case, deceleration between the blocks can be reduced, and the actual machining time can be shortened.

  As described above, when the alarm flag is set to “1”, the block is not executed and the single block is stopped. Therefore, the actual processing is not performed for the block having the program abnormality. When the operator corrects the program, the alarm flag is reset to “0” (steps 208 to 210). When the operator corrects the program and inputs a restart instruction, the foreground process stops. The processing after step 100 is started from the program position. In addition, since background processing is performed at a high speed, an alarm is generated, and the correction of the program is often completed before the actual machining is stopped by the alarm. Since the process is reset to "", the process is continued without stopping the machining.

It is a principal part block diagram of one Embodiment of this invention. It is a flowchart of the process in the foreground in the embodiment. It is a flowchart of the process in the background in the embodiment.

Explanation of symbols

10 Numerical control device 50, 51, 52 Servo motor 62 Spindle motor 63 Position coder

Claims (7)

In a numerical control device that drives and controls a controlled object according to a program,
Foreground program execution means for executing the program and outputting a drive command to the control object;
The program is executed without outputting a drive command to the control object in parallel with the drive control processing of the control object, and a background program execution means including a program check means for checking a program abnormality,
When a program abnormality is detected by the background program execution means, means for storing the abnormality corresponding to the block in which the abnormality is detected;
Means for stopping at the end point of the block before the program abnormality was stored during the program execution by the foreground program execution means;
A numerical control device comprising:   2. The numerical control apparatus according to claim 1, wherein the background program execution means executes the program at a maximum feed speed and a maximum adjustment time constant.   The numerical control apparatus according to claim 1, wherein the program check unit performs a program abnormality check of a machining program format check, an entry check into an entry prohibited area, and an interference check.   The background program execution means inserts a corner R and a chamfer block between the blocks and executes the program, and the program check means checks the program based on the execution. 4. The numerical control device according to any one of 3.   The numerical control device according to claim 4, wherein the inserted corner R and the chamfer block are also executed when the program for driving and controlling the control object executed in the foreground process is executed.   Editing means for enabling editing of the program when a program abnormality is detected by the program checking means, and means for erasing the program abnormality stored in the storage means when correction of the program is completed by the editing means; The numerical control apparatus according to claim 1, further comprising: A specifying means for specifying an arbitrary block of the program is provided, and after the program is corrected by the editing means, the program is executed by the background program executing means from the block specified by the specifying means, and the program check is resumed. The numerical control apparatus according to claim 6.

Images