JPH0922310A - Numerical controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the programming efficiency by executing a multiple- systematic operation, which has been executed conventionally by a ladder program, with an NC program. SOLUTION: A read control part 2 reads the command of an NC commander 1 and transmits shaft moving commands corresponding to respective shafts to preprocessing arithmetic means 21, 31 and 41. Buffers 23, 33 and 43 store the shaft moving commands to which preprocessing arithmetic is performed. A transfer-wait flag is prepared for informing whether there is empty spaces in these buffers or not. Then, interpolation arithmetic means 22, 32 and 42 reads the commands stored in the buffers 23, 33 and 43 and distribute pulses to servo amplifiers 51-54 corresponding to the respective shafts. Afterwards, servo motors 61-64 are driven. Besides, an operating state setting command is provided for switching an ordinary operation and the multiple system operation. Thus, the multiple system operation can be performed with a simple NC program.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control device, and more particularly to a numerical control device for multi-system operation.

[0002]

2. Description of the Related Art When a machining operation is performed using a numerical control system, it is sometimes desired to have a machine perform a plurality of operations simultaneously. For example, you may want to attach the next tool to be used while machining a workpiece. If you want to perform other auxiliary work during such machining work, systematically classify the axes used in each work and control each group of classified axes independently and in parallel. The multi-system operation is performed.

In order to perform such multi-system operation, conventionally, a ladder program has been created in consideration of the movement amount of each axis, the positional relationship with other axes, the time timing, and the like. This ladder program is processed by a PMC (Programmable Machine Controller) built in the numerical control device, and its command is transmitted to the numerical control unit. And the multi-system operation was performed by the numerical control unit according to these commands.

[0004]

However, since the ladder program is originally thought to control the input / output signals on the machine tool side, it is generally not easy to create a ladder program for axis control, let alone In the case of complex axis control such as multi-system operation, even more ladder steps are required. In addition, when there is a change in the axis control operation, not only the ladder program at the corresponding place must be changed, but also the peripheral sequence must be changed significantly. As described above, creating and changing a ladder program generally requires a lot of man-hours and is not efficient.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a numerical controller capable of easily performing multisystem operation with a simple program.

[0006]

In order to solve the above-mentioned problems, the present invention provides an operation state setting command for selecting two of a normal operation state and a multi-system operation state in a numerical controller for performing a multi-system operation. A first pre-processing operation means that operates in the normal operation state, and a first interpolation operation means that interpolates an axis movement command from the first pre-processing operation means and outputs a distributed pulse for each axis. , A second preprocessing operation means that operates during the multi-system operation state, a buffer that stores an axis movement command from the second preprocessing operation means, and each axis by interpolating an axis movement command from the buffer And a second interpolation calculation means for outputting the distributed pulse of the above.

[0007]

The reading controller reads the NC command and sends the axis movement command corresponding to each axis to the respective preprocessing operation means. The buffer stores the axis movement command that has been preprocessed. In addition, a transfer wait flag is provided to inform the preprocessing operation means whether or not there is a free space in the buffer.
Then, the interpolation calculation means reads the command stored in the buffer and distributes the pulse to the servo amplifier corresponding to each axis. The buffer reads and stores the next block while the pulse distribution is being performed.

Further, switching between the normal operating state and the multi-system operating state is performed by an operating state setting command.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of the present invention, showing a configuration example capable of operating three systems with four control axes, as multi-system operation. Further, this is merely a hypothetical specific example of the present invention and does not limit the technical scope of the present invention.

In the figure, the four-axis control unit 10 is used for normal operation in which one machining operation is performed using four axes, and the X / Y-axis control unit 20 and the Z-axis control unit 3 are used for three-system operation.
0, U-axis control unit 40 is used.

First, the operation of the four-axis control section 10 will be described.
The read control unit 2 reads the command from the NC command 1,
The axis movement command is transmitted to the preprocessing calculation means 11. The pre-processing calculation means 11 performs pre-processing calculation based on a command specified by the read control unit 2. The interpolation calculation means 12 interpolates the axis movement command from the preprocessing calculation means 11 and distributes the pulse corresponding to each axis to the servo amplifiers 51 to 54. Then, the servo motors 61 to 64 are driven.

Next, the operation of multisystem operation will be described. The axis corresponding to each system is the X / Y axis for the first system and the Z for the second system.
The third axis is the U axis. The read control unit 2 reads the command from the NC command 1 and outputs the axis movement command corresponding to each axis in the X / Y-axis control unit 20, the Z-axis control unit 30, and the U-axis control unit 40 as preprocessing arithmetic means. 21, 31, 4
Send to 1. Buffers 23, 33, 43 are 3 each
It has one storage area and stores the pre-processed axis movement commands one after another. At this time, each buffer is provided with a transfer wait flag for notifying the preprocessing operation means 21, 31, 41 of the state of whether or not the buffer has an empty space. If the buffer is empty, the transfer wait flag is set to O.
It becomes N, and when there is no space, it becomes OFF. By confirming the state of the transfer waiting flag, the preprocessing operation means 21, 31,
41 is a buffer 23,33,
Sent to 43. With such a configuration, the data for 3 blocks is always read in advance. That is, the buffers 23, 33 and 43 read out and store the next block while the interpolation calculation means 22, 32 and 42 perform the pulse distribution operation to each axis to the servo amplifiers 51 to 54. Therefore, when the pulse distribution is completed, it is possible to immediately shift to the pulse distribution for the blocks already stored in the buffer. Then, after the pulses are distributed to each axis, the servo motors 61 to 64 are driven. Therefore, the movement of the machine can be controlled independently and in parallel for each system.

The switching between the two normal operating states and the multi-system operating state is performed by a motion command which is an operating state setting command. This motion command will be described later.

FIG. 2 is a flow chart showing the operation procedure of the buffer portion of the present invention, and it is assumed that the operating state of N system is set. [S1] If the transfer wait flag for the Nth system is ON, that is, if the buffer for the Nth system is free, go to step 3; otherwise, go to step 2. [S2] Pre-processing of one block of the Nth line is performed. [S3] Data is transferred to the Nth system buffer. [S4] The value obtained by incrementing N by 1 is set as N. [S5] If N is greater than or equal to MAX, which is the maximum number of systems, go to step 6, and if less than MAX, go to step 1. [S6] N is set to 1.

Therefore, the block transfer to the buffer is performed by such an operation procedure. Next, a motion command that is an operation state setting command will be described. FIG. 3 is an example of an NC program for switching between a normal operation state and a multi-system operation state by issuing a motion command using a G code, and shows a modal case and a one-shot case.

The command "G140P1" of the sequence number N100 in the program number O0001 is a command that means the motion command is ON, and this command can switch from the normal operating state to the multi-system operating state. When this modal G code is instructed, the motion command mode is entered after the preprocessing of the NC program and the distribution of pulses to each axis are completed. Next, each sequence number will be described. Sequence number N110
Positions the X, Y, Z, and U axes. Sequence number N120 is X100, Y20 as an axis movement command.
A linear interpolation of 0 and F3000 as the feed speed is performed. In the sequence number N130, the machine coordinate of the Y axis is the variable # 500.
Wait until it gets bigger. The sequence number N140 performs linear interpolation of Z290 and U300 as the axis movement command and F2500 as the feed rate. Sequence number N1
50 is a macro call command, 500 [msec]
Call the macro that starts the timer. Here, the macro number is 9101. After the same block continues thereafter, the motion command mode is turned off at the sequence number N200. If this "G140 P0" is instructed, it waits until the end of the function instructed by the motion command until then, and X120, which is the movement command of the sequence number N210 which is the process of the original NC sentence operation,
Linear interpolation of Y230 and feed speed F1500 is performed.

Next, the command "G" of the sequence number N220
141 P1 ”is a one-shot motion command ON
Is a command that means. This command is executed only for the movement of this block without waiting for the end of the previous block. Here, the Z of the block of the sequence number N210 is not waited for until the axis movement designated by the sequence number N210 is completed.
The movement of 120 is started. At the same time as this move, PMC
Write data to the address specified in D300. In addition, the next normal block is the sequence number N
230 also starts moving regardless of the end of the block of the motion command. Here, the U200 is moved. Sequence number N240 command “G142 P
1 ”is the G waiting for the end of the one-shot motion command.
It is a code and waits for the end of the block of the specified motion command to execute the next block. Here, it waits for the end of the motion command of sequence number N220 to move to X200.

[0018]

As described above, according to the present invention, in addition to the usual pre-processing operation means and interpolation operation means for performing multi-system operation, the pre-processing operation means, buffer and interpolation for multi-system operation are provided. It is possible to switch the operating state by providing a computing means and operating state setting command. Therefore, multi-system operation can be executed with a simple NC program.

[Brief description of drawings]

FIG. 1 is a principle block diagram of a numerical controller according to the present invention.

FIG. 2 is a flowchart showing a processing procedure of a buffer portion of the present invention.

FIG. 3 is a diagram showing an example of an NC program for switching between a normal operation state and a multi-system operation state.

[Description of Reference Signs] 1 NC command 2 Read control unit 10 4 axis control unit 20 X / Y axis control unit 30 Z axis control unit 40 U axis control unit 11, 21, 31, 41 Pre-processing calculation means 12, 22, 32 , 42 Interpolation calculation means 23, 33, 43 Buffers 51-54 Servo amplifiers 61-64 Servo motors

Claims (3)

[Claims] 1. A numerical controller for performing a multi-system operation, an operation state setting command for selecting two of a normal operation state and a multi-system operation state, and a first pre-processing operation which operates in the normal operation state. Means, first interpolating operation means for interpolating an axis movement command from the first preprocessing operation means and outputting a distribution pulse of each axis, and second preprocessing for operating in the multisystem operation state. Computing means; a buffer for storing the axis movement command from the second preprocessing computing means; and a second interpolation computing means for interpolating the axis movement command from the buffer and outputting a distributed pulse for each axis. A numerical controller characterized by having. 2. The numerical controller according to claim 1, wherein the second preprocessing operation means confirms an empty signal of the buffer and sends an axis movement command to the buffer. 3. The multi-system operation state next one-shot motion command does not wait for the completion of the block processing of the second interpolation calculation means, and the next block processing of the second interpolation calculation means is completed. The numerical control device according to claim 1, wherein the numerical control device executes.