JPH0635528A - Cnc axis control distribution system - Google Patents

Abstract

PURPOSE:To control the operations of motors, etc., in a CNC axis control distribution system by sorting plural axis control commands defined by a machining program into the commands of a control axis and a virtual axis respectively. CONSTITUTION:An analyzer 10a of a main CNC 10 analyzes the axis control commands of a machining program and sorts these commands into the commands of a control axis and a virtual axis respectively. Based on the command of the control axis, an axis controller 10c controls the operation of a servo motor 17a. Meanwhile a communication means 10b sends the data to another CNC with a command of the virtual axis. Meanwhile a communication means 20b of at least a single follower CNC 20 receives the data from the CNC 10 with a command of the virtual axis. Then an axis controller 20c controls the operation of a servo motor 27a based on a command of the virtual axis received by the means 20b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CNC axis control distribution system for a single axis CNC (numerical controller), and more particularly to a plurality of axis control distribution systems.
The present invention relates to a CNC axis control distribution system for operating the axis CNC in synchronization.

[0002]

2. Description of the Related Art Numerical control devices for one-axis control are being widely used to control individual stations of a transfer line. One numerical control device is installed in each station to control the operation of each station. Such a numerical control device is called a "1-axis CNC", which controls the operation of the station by itself and
The operation control is also performed by cooperative operation between the axis CNCs. An example of such a uniaxial CNC is Japanese Patent Application No. 1-4150 filed by the present applicant.

By the way, in the case of controlling operations by cooperative operation between the 1-axis CNCs, a PMC (programmable machine controller) in the 1-axis CNCs is used to realize mutual waiting control by a sequence program. ing.

For example, there is a case in which after performing drilling at the first station, tapping is performed at the second station. In this case, tapping is performed in the second station after the drilling is completed in the first station and the work is transferred to the second station by the waiting control by the sequence program.

[0005]

[Problems to be Solved by the Invention]
In the queuing control by the program, you have to create a sequence program with a considerable number of steps,
Moreover, there is a problem that it takes a lot of time to create a program because it is complicated.

Further, since it is necessary to create a sequence program for each individual one-axis CNC, there is a problem that labor for program creation is required. The present invention has been made in view of such a point, and distributes an axis control command of two or more axes defined in a machining program to a control axis and a virtual axis without creating a sequence program, and operates. It is an object of the present invention to provide a CNC axis control distribution system for controlling.

[0007]

According to the present invention, in order to solve the above-mentioned problems, in a CNC axis control distribution system for operating a plurality of 1-axis CNCs (numerical control devices) in synchronization, the axes of a machining program are An analysis unit that analyzes the control command and distributes the command to the command of the control axis and the command of the virtual axis,
Main CNC comprising first axis control means for controlling the operation of the first motor based on the command of the control axis, and first communication means for transmitting the command of the virtual axis to another CNC.
And second communication means for receiving the virtual axis command transmitted from the main CNC, and controlling the operation of the second motor based on the virtual axis command received by the second communication means. An axis control distribution system for a CNC is provided, comprising: at least one slave CNC having a second axis control means.

[0008]

In the main CNC, the analyzing means analyzes the axis control command of the machining program and distributes the command to the command of the control axis and the command of the virtual axis. The first axis control means controls the operation of the first motor based on the control axis command. Also, the first
Communication means transmits the command of the virtual axis to another CNC.

On the other hand, in at least one slave CNC, the second communication means receives a virtual axis command transmitted by data from the master CNC. The second axis control means controls the operation of the second motor based on the virtual axis command received by the second communication means.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating the principle of the present invention. The axis control distribution system of the CNC of the present invention comprises a uniaxial CNC such as a master CNC 10 and at least one slave CNC 20.
Further, the main CNC 10 includes an analysis unit 10a and a communication unit 10
b and axis control means 10c. Further, at least one slave CNC 20 or the like includes a communication unit 20b or the like and an axis control unit 20c or the like. The main CNC1
0 and at least one slave CNC 20 are communication lines 1
Are bound together by 00.

The analysis means 10a analyzes the axis control command of the machining program and distributes the command to the command of the control axis and the command of the virtual axis. The communication means 10b, 20b, etc. are other C
Performs data transmission control for mutual communication with the NC. The axis control means 10c, 20c and the like control the operation of the servomotors 17a, 27a based on the axis control command.

Next, the operation of the CNC axis control distribution system of the present invention will be described. Hereinafter, in order to simplify the explanation, the main CNC 10 controls the control axis (hereinafter, referred to as “X axis”).
And the slave CNC 20 controls the servo motor 27a of the virtual axis (hereinafter referred to as "Y-axis").

First, in the main CNC 10, the analyzing means 10a
Analyzes the axis control command such as the G function code for each block of the machining program. By this analysis, the machining program is sorted into X-axis commands and Y-axis commands.
The X-axis command thus distributed is the axis control means 10c.
The Y-axis command is sent to the communication means 10b.

The axis control means 10c prepares for controlling the operation of the servomotor 17a based on the X-axis command. The communication means 10b also transmits the Y-axis command to the slave CNC 20 as data. Specifically, the communication means 10b is Y
After converting the axis command into a PMC axis control format signal, data is transmitted to the communication means 20b. The PMC axis control format signal is, for example, a 4-bit predetermined format signal corresponding to a signal for controlling the axis by the PMC, and includes a fast-forward command signal, a movement amount command signal, a waiting command signal and an axis control start signal. Be done.

Here, the fast-forward command signal is a signal for instructing fast-forward on the Y-axis. The movement amount command signal is a signal for moving the Y axis by a predetermined amount while processing. The waiting command signal is a signal for waiting for execution of the fast-forwarding command signal, the movement command signal, and the like. The axis control start signal is a signal for starting execution of the fast-forward command signal, the movement command signal, and the like.

On the other hand, in the slave CNC 20, the communication means 20b
Receives the Y-axis command transmitted from the main CNC 10. Based on the Y-axis command received by the communication unit 20b, the axis control unit 20c prepares to control the operation of the servo motor 27a. Specifically, the communication means 20b receives the PMC axis control format signal, converts it into an actual operation signal by a sequence program, and the axis control means 20c receives this operation signal and controls the operation of the servomotor 27a. Get ready. When the communication means 20b receives the waiting command signal, the operation of the servo motor 27a is temporarily stopped until it receives the axis control start signal. Then, after receiving the axis control start signal, the communication means 20b transmits a waiting completion signal indicating that the waiting is completed to the communication means 10b.

After that, the main CNC 10 controls the operation of the X axis (servo motor 17a), and the slave CNC 20 controls the operation of the Y axis (servo motor 27a). Thus, the main C
A cooperative operation between the NC 10 and the slave CNC 20 can be realized.

Next, a uniaxial CN for realizing the above operation
The configuration of C will be described. Since the main CNC 10 and the slave CNC 20 have the same configuration, the main CNC 10 will be described.

FIG. 2 is a block diagram showing the overall structure of the uniaxial CNC. In the figure, the main CNC (numerical controller)
10 is a CPU (processor) 11, a ROM 12, and an RA
An M13, a PMC (programmable machine controller) 14, an I / O (Input / Output) unit 15, an axis control circuit 16, a servo amplifier 17, a buffer 18a and a connector 18b.

The CPU 11 controls the entire main CNC 10 according to the system program stored in the ROM 12. In addition to the above system programs, the ROM 12 stores programs such as an analysis program, a communication program, and an axis control program. The analysis means 10a shown in FIG. 1 is a function that is installed only in the main CNC 10 and is realized by the CPU 11 executing the analysis program. Similarly, the communication unit 10b and the axis control unit 10c are functions that are mounted on all the 1-axis CNCs and are realized by the CPU 11 executing the communication program and the axis control program.

Since the RAM 13 is an SRAM or the like and is backed up by a battery (not shown), the stored data is retained as it is even if the power of the main CNC 10 is cut off. The RAM 13 stores temporary data such as machining programs and signals for data transmission to other CNCs.

The PMC 14 is a sequence program created in a ladder format and controls the machine tool via an I / O unit 15 described later. That is, according to each command function such as the M function, S function, and T function commanded by the machining program, the sequence program converts the signal into a signal necessary for operating the machine tool and outputs the signal. The signal output at this time drives a magnet or the like of the machine tool to operate a hydraulic valve, an electric actuator or the like. Further, it receives a signal from a limit switch of a machine tool, a switch of a machine operation panel, or the like to perform a predetermined process.

The PMC 14 also includes an I / O unit 15
The virtual axis command is data-transmitted to another slave CNC 20 or the like via. In this data transmission, PMC axis control format signal,
That is, the PMC 14 is a signal corresponding to a signal for controlling the axis, and the fast-forward command signal, the movement command signal, the waiting command signal, the axis control start signal, and the like are data-transmitted. The I / O unit 15 and the I / O units of other slave CNCs 20
The communication line 100 with the / O unit is coupled to each other by a parallel line.

The axis control circuit 16 receives a movement command of the control axis (X axis) from the CPU 11 and drives the servo motor 17a via the servo amplifier 17. The buffer 18a is connected to the connector 18b, and the data packet including the command is sent from the connector 18b to the serial signal line. In order to perform packet communication, each CN
It is necessary to match the data transmission rate between Cs and to match the protocols.

Next, the analyzing means 10a of the main CNC 10 is described.
The distribution of the axis control command executed in step 1 will be described.
FIG. 3 is a diagram showing distribution of axis control commands executed by the analysis means 10a of the main CNC 10. Note that FIG.
Similarly, the main CNC 10 controls the servo motor 17a of the control axis (hereinafter referred to as "X axis"), and the slave CNC 20 controls the servo motor 27 of the virtual axis (hereinafter referred to as "Y axis").
a shall be controlled.

The machining program 200 is a program including an X-axis command and a Y-axis command. The analysis unit 10a distributes the X-axis command and the Y-axis command included in the machining program 201 to a control axis program 202 including only the X-axis command and a virtual axis program 203 including only the Y-axis command. create.

The control axis program 20 created in this way
2 is a servomotor 17 by the axis control means 10c of FIG.
The operation of a is controlled. Also, the virtual axis program 203
Is converted into a PMC axis control format, and then the axis control means 20c is transmitted via the communication means 10b and the communication means 20b of FIG.
Data is transmitted to control the operation of the servo motor 27a.

FIG. 4 is a flow chart showing the processing procedure of the present invention executed by the main CNC 10, and is a flow chart for allocating to the two axes of the X axis and the Y axis. In the figure, the number following S indicates a step number. Note that, as in FIG. 1, the master CNC 10 controls the servo motor 17a of the control axis (hereinafter, referred to as “X axis”), and the slave CNC 20.
Is a virtual axis (hereinafter, referred to as “Y axis”) servo motor 2
7a shall be controlled. [S1] It is determined for each block whether or not the machining program includes a Y-axis command. If the Y-axis command is included (YES), the process proceeds to step S2 and Y
If the axis command is not included (NO), step S5
Proceed to. [S2] Pre-processing for distributing the X-axis command and the Y-axis command is performed. For example, the machining program 201 including the X-axis command and the Y-axis command as shown in FIG.
A control axis program 202 including only axis commands, and Y
In the virtual axis program 203 that includes only axis commands,
Distribute every block. [S3] The virtual axis program 203 distributed in step S2 is converted into a PMC axis control format signal. Specifically, it is a PMC axis control format signal based on the virtual axis program 203, that is, a signal corresponding to a signal for controlling the axis by the PMC 14, and includes a fast-forward command signal, a movement amount command signal, a queuing command signal, and an axis control. It is converted into a start signal or the like. [S4] The PMC axis control format signal converted in step S3 is output to the slave CNC 20 via the communication means 10b in FIG. After this PMC axis control format signal is output, the operation of the X axis (servo motor 17a) is controlled, and this processing ends.
When performing a cooperative operation between the master CNC 10 and the slave CNC 20, first, a waiting command signal is output to the slave CNC 20, and after the waiting completion signal is received from the slave CNC 20, the operation of the X axis (servo motor 17a) is controlled. . [S5] After the preprocessing for pulse distribution on the X axis, the operation of the X axis (servo motor 17a) is controlled.

Therefore, the analyzing means 10 of the main CNC 10
a analyzes the axis control command of the machining program and distributes it to the command of the control axis and the command of the virtual axis, and the axis control means 20c of the slave CNC 20 controls the operation of the servo motor 27a. A program can control the movement of multiple axes. Further, since it is not necessary to individually create a sequence program, the labor of program creation can be greatly reduced. Furthermore, the main CN
Since the C10 and at least one slave CNC 20 and the like are coupled to each other by the parallel line communication line 100, there is no delay in data transmission, and each axis can be operated almost simultaneously.

In the above description, the master CNC 10 analyzes the axis control command of the machining program and distributes the command to the control axis and the command to the virtual axis to control each servo motor. However, two or more slave CNCs communicate with each other. By connecting to the line 100, each servo motor can be controlled by being distributed to two or more virtual axes.

Although the servomotors 17a and 27a are applied as control targets, other motors whose operation can be controlled may be applied as control targets. Furthermore, the communication means 10
In addition to the PMC axis control format signal which is mutually data-transmitted between b, 20b, etc., a synchronization signal for synchronizing the operations of the main CNC 10 and the slave CNC 20, for example, the main CNC, is used.
10 receives the waiting completion signal and then transmits data to the subordinate CNC 20, etc., so that the main CNC 10 and the subordinate CN 10
It is also possible to perform an operation equivalent to the synchronous operation of C20 and the like.

[0032]

As described above, in the present invention, the main CN
The C analysis means analyzes the axis control command of the machining program and distributes it to the control axis command and the virtual axis command, and the second axis control means of at least one slave CNC controls the operation of the second motor. Since it is configured to do so, a single machining program can control a plurality of axes. Therefore, only the machining program on the main CNC side needs to be created, and the program creation time is greatly shortened.

Further, since it is not necessary to individually create the sequence program, the labor for creating the program can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram showing an overall configuration of a uniaxial CNC.

FIG. 3 is a diagram showing distribution of axis control commands by analysis means.

FIG. 4 is a flowchart showing a processing procedure of a 1-axis CNC.

[Explanation of symbols]

 10 main CNC 10a analysis means 10b communication means 10c axis control means 17a servo motor 20,30 slave CNC 20b, 30b communication means 20c, 30c axis control means 27a, 37a servo motor

Claims (4)

[Claims] 1. A CNC axis control distribution method for synchronously operating a plurality of 1-axis CNCs (numerical control devices), wherein an axis control command of a machining program is analyzed and a command of a control axis and a command of a virtual axis are analyzed. A first axis control means for controlling the operation of the first motor based on the command of the control axis, and a first axis for data transmission of the virtual axis command to another CNC. Based on a command of the virtual axis received by the second communication means, and a second communication means for receiving the command of the virtual axis transmitted from the main CNC. At least one slave C having a second axis control means for controlling the operation of the second motor
An axis control distribution system for a CNC, which comprises: 2. The axis control distribution system of CNC according to claim 1, wherein a communication line between the first communication means and the second communication means is a parallel line. 3. The axis of the CNC according to claim 1, wherein the command of the virtual axis for data transmission from the master CNC to the slave CNC includes at least a fast-forward command and a movement amount command. Control distribution method. 4. The command of the virtual axis for transmitting data from the master CNC to the slave CNC includes a waiting command.
4. The axis control distribution system of a CNC according to claim 3, wherein the slave CNC is configured to transmit a queuing completion command to the main CNC in response to the queuing command to perform cooperative operation.