JPS6381509A - Numerical controller provided with parallel operation function - Google Patents

Abstract

PURPOSE:To facilitate the design of NC data for parallel processing by varying the priority of the processing depending on the NC data in executing the processing based on plural NC data in parallel. CONSTITUTION:A priority storage means storing a priority data deciding the priority of processing of plural NC data, a priority change means changing the priority data stored in the priority storage means, and a sequence control means controlling the order of execution of the NC data based on the priority data stored in the priority storage means are provided. Thus, the priority of the NC data in the parallel processing is changed freely. For example, the presence or absence of processing request is decided in order from the unit having higher priority set by a task switch 323 and when a processing request exists, the processing to the unit is executed thereby allowing a main CPU 31 to place the priority for the unit having higher priority at all times.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a numerical control device that can perform different tasks in parallel, such as tool modification processing and workpiece machining processing.

[Prior art]

Conventionally, a numerically controlled grinding machine is known that numerically controls the control axis of a tool correction device and processes the numerical control and the numerical one-series control of the control axis related to machining in parallel in real time. 58-186561). This grinding machine has an independent pulse distribution circuit that distributes pulses to the control axis of the tool correction device and a pulse distribution circuit that distributes pulses to the feed axis of tools, tables, etc., and has one cP.
U controls the two pulse distribution circuits in parallel in real time. In this grinding machine, correction NC data is used to control tool correction, and processing NC data is used to control processing of a workpiece. In this machining NC data, for example, after the grinding process is finished, starting data for starting the execution of the correction NC data is programmed before a data block that instructs the tool to move rapidly back. Then, the machining NC data are sequentially executed to progress the machining process of the workpiece, and when the activation data is executed after a certain machining process is completed, the correction NC data is activated. When the CPU outputs the positioning data to the above-mentioned pulse distribution circuit, it enters a waiting state until the pulse distribution is completed.
Using the waiting state, NC data for processing and NC for correction
Processing with data is performed in parallel.

[Problems to be solved by the invention]

The above parallel processing is to execute other NC data using the waiting time when one NC data is being executed. For this reason, the priority of execution is determined in advance for NC data, and if a waiting time occurs in a certain processing process of certain NC data, other NC data with the next highest fR priority is executed. When the waiting state in the original processing process of the original NC data is eliminated, the processing of other NC data is immediately interrupted and the original processing process is resumed. For example, between the processing NC data and the correction NC data described above, the processing is considered more important, so the former is set to have a higher priority than the latter. Therefore, when, for example, pulse distribution for tool feed is completed during tool correction, processing based on the original machining NC data is immediately resumed and the tool correction processing is interrupted. Further, if a waiting time occurs in the processing using the machining NC data, the tool correction process is restarted, so that the tool correction process becomes an interrupted process. Therefore, there is a problem that the repair surface of the tool is not formed smoothly. Conventional numerically controlled grinding machines do not have a function to freely change the above-mentioned priorities using NC data, so it is not possible to solve the drawbacks of parallel processing caused by the above-mentioned fixed priorities. There wasn't. The present invention has been made in order to solve the above problems, and its purpose is to reduce N in parallel processing.
The purpose is to freely change the priority of C data.

[Means to solve the problem]

The structure of the invention for solving the above problem is that in a numerical control device that performs processing based on a plurality of NC data in parallel using one processing device that decodes the NC data and performs processing according to the processing, the plurality of priority storage means for storing priority data that determines the priority of processing the NC data;
priority changing means for changing the priority data stored in the priority storage means based on the NC data; and a priority change means for changing the priority data stored in the priority storage means based on the priority data stored in the priority storage means; This is because a sequence control means for controlling the sequence is provided.

【Example】

The present invention will be described below based on specific examples. FIG. 1 is a configuration diagram showing a numerically controlled grinding machine. 10 is a bed of a numerically controlled grinding machine, and on this bed 10, a table 11 driven by a servo motor 16 via a screw feed mechanism is arranged so as to be slidable in the direction of the Z-axis, which is parallel to the spindle axis. ing. A headstock 12 having a main spindle 13 mounted thereon is disposed on the table 11, and the main spindle 13 is rotated by a servo motor 14. Further, a tailstock 15 is placed on the right end of the table 11, and the center 19 of the tailstock 15 and the center 1 of the main spindle 13 are
A workpiece K consisting of a camshaft is held between the two. A positioning pin 18 protruding from the main shaft 13 is fitted into the workpiece, and the rotational phase of the workpiece matches the rotational phase of the main shaft 13. A tool stand 20 that can move forward and backward toward the workpiece is guided behind the bed 10, and a grinding wheel G that is rotationally driven by a motor 21 is supported on the tool stand 20. This tool stand 20 is connected to a servo motor 23 via a feed screw of the circuit.
The servo motor 23 is connected to and moved forward and backward by forward and reverse rotation of the servo motor 23. On the other hand, a tool correction device 60 having a correction tool 61 and capable of changing the relative positional relationship between the tool and the grinding wheel G is mounted at the rear of the tool stand 20. Correction tool 61
is the cutting into the grinding wheel G by the servo motor 63, that is, U
The feed in the axial direction is controlled, and the feed parallel to the grinding surface of the grinding wheel G, that is, in the W-axis direction, is controlled by the servo motor 64. Drive units 50, 51, 52 are numerical control devices 30
command pulses are input from the respective servo motors 23
．． This is a circuit that drives 14.16. Further, drive units 53 and 54 are circuits that drive servo motors 63 and 64. The numerical control device 30 is a device that primarily numerically controls the rotation of a control shaft to control grinding of a workpiece and correction of the grinding wheel G. Connected to the numerical control device 30 are a tape reader 42 for inputting NC data for machining, NC data for correction, etc., and a control panel 43 for supplying control signals such as commands to start machining processing. As shown in FIG. 2, the numerical control device 30 is mainly composed of a main CPU 31 for controlling the grinding machine, a ROM 33 that stores a control program, a RAM 32 that stores input data, etc., and an input/output interface 34. . On the RAM 32, a processing NC data area 321 for storing processing NC data, a correction NC data area 322 for storing correction NC data, and a task switch 323 for setting a priority unit are formed. Numerical control device 3
0 is a unit 8 consisting of a drive CPU I 36, a RAM 35, and a pulse distribution circuit 37 as a drive system for the servo motors 23, 14, and 16, and a servo motor 63.6.
As a drive system of 4, a unit B is provided which is separated from the RAM 38, the drive CPUn 39, and the pulse distribution circuit 40. The RAM 35 is a storage device into which positioning data for the grinding wheel G, table 11, and spindle 13 is input from the main CPLI 31. Further, the RAM 38 is a storage device into which positioning data for the correction tool 61 is input from the main CPU 31. The drive CPU 36 is a device that performs calculations such as slow-up, slow-down, and interpolation of target points regarding the feed of control axes related to machining, and outputs positioning data of interpolation points at regular intervals. This is a circuit that outputs a movement command pulse to each drive unit 50, 51, and 52. On the other hand, drive CPLIII39
is a device that performs the same action as above on the control axis related to tool modification. Next, the effect will be explained. The main CPU 31 performs processing according to the flowchart shown in FIG. This program is activated at regular intervals by timer interval interrupts. A series of processes from step 100 to step 108 achieves the function of the sequence control means, which is one of the constituent elements of the invention. Below, NC for processing
The data goes to NC data 8, and the correction NC data goes to NC.
Reference as data B. In the initial state, the task switch 323 is set to 0, and processing for unit) A is given priority over processing for unit) B. First, in step 100, the contents of the task switch 323 are checked to determine whether or not unit I-B is in the priority state. If unit I-B is in the priority state, the process moves to step 102, where it is determined whether there is a processing request from unit B. If there is a processing request, step 120
Processing related to NC data B is executed. If it is determined in step 102 that there is no processing request from unit B, the process proceeds to step 104, where it is determined whether or not there is a processing request from unit Δ. If there is a processing request, the process moves to step 110 and processing regarding NC data A is executed. Also, if there is no processing request from unit A, this program ends. On the other hand, in the determination at step 100, if the processing for unit l-B is not in the priority state, that is, the processing for unit l-A is in the priority state, the process moves to step 106 and whether there is a processing request from unit 8 or not. If it is determined that there is a processing request, the process moves to step 110 and processing regarding NC data A is executed. If there is no processing request from unit A, the process moves to step 108, where it is determined whether or not there is a processing request from unit B. If there is a processing request, the process moves to step 120, and processing regarding NC data B is executed, and if there is no processing request, the program ends. After all, through the above determination process, the presence or absence of a processing request is determined in order from the unit with the highest priority set in the task switch 323, and if there is a processing request, the processing for that unit is executed. Main CP
Regarding the processing for each unit of U31, the one with higher priority is always given priority. If the task switch 323 is set to 0, unit A has a higher priority. In this state, if a processing request is output from unit A first, steps 110 and subsequent steps are executed. First, one block of data is read from the NC data Δ (110). Next, the block data is decoded (112), and it is determined whether it is the data end (114). If it is the data end, the program ends, but if it is not the data end, step 1
16, calculations are performed on the number of distributed pulses, speed, etc. for positioning the control axis at the target position according to the read data (116). Positioning data that is the result of this calculation is output to unit A (118), and the program ends. unit)
The next data of NC data A is not decoded until A completes the pulse distribution process and the positioning to the target position is completed. When the pulse distribution is completed and a processing request is output from unit A, steps 110 to 11 described above are performed.
8 is executed. Until a processing request is output from unit A, if there is a processing request from unit B, the processing for unit B will be executed. When there is a processing request from unit) B, the determination in step 108 is Y[! S, step 1
20 or less are executed. First, the data of NC data B is read out (120) and decoded (122). If the data end is determined in step 124, the execution of the program is terminated, but if it is not the data end, step 126 and step 13 are performed.
It is determined whether there is a code that controls switching of the priority unit of 0. If not, steps 134 and subsequent steps are executed, positioning data for the commanded target position is calculated in the same way as step 116 (134), the data is output to unit B (136), and this program ends. . Through such processing, processing for unit A can be prioritized, and pulse distribution between unit A and the other units can be executed in parallel. By the way, if the processing for unit A is prioritized as described above, depending on the timing of the processing request from unit) A, the acceptance of the processing request from unit) B may be delayed. Therefore, for blocks that need to be processed consecutively in the data block of NC data B, such as a correction command block for the cylindrical grinding surface of a grinding wheel and a correction command block for its shoulder with radius, the processing is Priority units need to be switched to avoid interruptions. For this,
Among the NG data B (instruction code rG72J is inserted before a series of data blocks that need to be processed with priority, and instruction code rG73J is inserted after that series of data blocks. The rG72J code is a unit) B is given as a priority unit. Then, the "rG73" code cancels the priority of unit B and makes unit A the priority unit. It is determined in step 126 whether or not the rG72J code is present. If the code is present, 1 is set in the task switch 323 in step 128, and the priority unit is set to unit level. Further, it is determined in step 130 whether or not the rG73J code is present. If the code is present, 0 is set in the task switch 323 in step 132, and the priority unit is set to unit A in the initial state. If unit B is set as the priority unit in step 128, step 1 of the next control cycle of this program
00 becomes YES, it is determined first whether or not there is a processing request for unit B, and if there is a processing request, it will be processed before the processing for unit 8. Therefore, the processing of the data block sandwiched between the "rG72" code and the rG73J code is executed without interruption. Note that the number of NC data to be processed in parallel is not limited to two. Furthermore, the plurality of NC data is not limited to processing NC data and correction NC data.

【Effect of the invention】

In the case where processing based on a plurality of NC data is executed in parallel, the present invention determines the priority of the processing. Since the priority can be changed depending on the NC data, the priority can be programmed for each data block, making it easier to design NC data for parallel processing.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a numerically controlled grinding machine using a numerical control device according to an embodiment of the present invention. Figure 2 is a block diagram showing the electrical configuration of the numerically controlled bag. FIG. 3 is a flowchart showing the processing procedure of the CPU. 10゛Bed 11゛Table 13゛°Spindle 1
4.16.23.63.64...-Servo motor 15
Tailstock 20゛・°Tool stand 30...Numerical control device 6
0-Tool correction device 61-Correction tool G.-Grinding wheel
K - Workpiece

Claims (2)

[Claims] (1) Decode NC data and process accordingly 1
In a numerical control device that performs processing based on a plurality of NC data in parallel using one processing device, a priority storage means for storing priority data for determining processing priority of the plurality of NC data; priority changing means for changing the priority data stored in the priority storage means based on the priority data; and order control for controlling the order of execution of the NC data based on the priority data stored in the priority storage means. 1. A device control device with a parallel processing function, characterized by comprising: means. (2) The plurality of NC data are processing NC data that numerically controls the control axis for processing the workpiece, and correction NC data that numerically controls the control axis of the correction device that corrects the tool. A numerical control device having a parallel processing function according to claim 1.