JPH0836413A - Time management system for cnc - Google Patents

Abstract

PURPOSE:To manage the execution start times of blocks of a working program on the numerical controller (CNC) side by making a required block of the working program include the command of the execution start time and executing the program of this block at the execution start time. CONSTITUTION:The CNC is constituted with a processor as the center, and the processor controls the whole of the CNC in accordance with the system program stored in a ROM. A working program 1 includes the command of the execution start time for each block, and a program read means 2 reads in the working program 1 with a block as the unit. An execution start command means 4 executes the execution start command when the counted value of a timer 3 which counts the time reaches the commanded execution start time, and a program execution means 5 executes the program of the block, whose execution start is commanded, to control the movement of each shaft. The time counted by the timer 3 is, for example, the time elapsed after the operation start of the CNC.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time management system of a CNC for managing the execution start time of a machining program executed by the CNC, and particularly to a C for managing the execution start time of each block.
It relates to a time management system of NC.

[0002]

2. Description of the Related Art Conventionally, a machining program executed by a CNC is read and executed by the CNC for each block. This machining program is started and stopped by a PC (programmable controller) controlling an interface signal incorporated in the CNC.

FIG. 4 is a diagram showing an example of an execution procedure of a conventional machining program. The machining program is written in the memory on the CNC 51 side. This machining program is
For example, at the time t11, the program PRO11 is set to the time t1.
2 is configured to execute the program PRO12. On the PC52 side, first, at time t11, CN
Send a start command to C51. CNC51 which received this,
Start executing the program PRO11. Program PR
When the execution of O11 ends, the CNC 51 sends the M code of the next block (here, M02) to the PC 52.

Upon receipt of this M code, the PC 52 receives the time t.
It waits until 12 and at time t12, sends an M code completion signal to the CNC 51. C receiving this completion signal
The NC 51 executes the program PRO12. In this way, the CNC 51 executes the program according to the management of the PC 52.

[0005]

However, in such a conventional method, the sequence program on the PC 52 side needs to control the interface signal and monitor the time. In addition, since the interface signal is exchanged between the CNC 51 and the PC 52 every time the block of the machining program is executed, there is a problem that the accuracy of the execution timing is deteriorated by the exchange time.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a CNC time management system in which the execution start time of a block of a machining program can be managed only on the CNC side. .

[0007]

In order to solve the above problems, in the present invention, in a CNC time management system for managing the execution start time of a machining program executed by the CNC, a command of the execution start time is sent to a necessary block. A machining program included therein, a program reading means for reading the machining program in block units, a timer for counting time, and an execution start command for issuing an execution start command when the count value of the timer reaches the commanded execution start time. There is provided a time management system of CNC, characterized by comprising: means and a program execution means for executing the program of the block for which the execution start command is issued.

[0008]

In the machining program, necessary blocks include instructions for the execution start time. The program reading means reads this machining program in block units. The execution start command means issues an execution start command when the count value of the timer for counting time reaches the commanded execution start time. The program execution means executes the program of the block for which the execution start instruction has been issued.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the concept of the function of the time management system of the CNC of the present invention. The machining program 1 includes a command for the execution start time for each block. The program reading means 2 reads this machining program in block units. Then, the execution start instruction means 4 issues an execution start instruction when the count value of the timer 3 for counting time reaches the instructed execution start time. Program execution means 5
Executes the program of the block for which the execution start command is issued and controls the movement of each axis.

FIG. 2 is a block diagram showing a schematic configuration of hardware of a numerical controller for implementing the CNC time management system of the present invention. The numerical controller (CNC) is mainly composed of the processor 11. Processor 11 is ROM
The entire numerical controller is controlled according to the system program stored in 12. This ROM12 is EPROM
Alternatively, an EEPROM is used.

An SRAM or the like is used for the RAM 13, and temporary calculation data, display data, input / output signals, etc. are stored therein. The non-volatile memory 14 uses a CMOS backed up by a battery (not shown), and stores parameters, machining programs, tool correction data, pitch error correction data and the like that should be retained even after the power is turned off.

The CRT / MDI unit 20 is arranged on the front surface of the numerical controller or at the same position as the machine operation panel.
Used to display data and graphics, input data, and operate numerical control equipment. The graphic control circuit 21 converts a digital signal such as numerical data and graphic data into a raster signal for display and sends the raster signal to the display device 22, and the display device 22 displays these numerical values and graphics. CR on the display device 22
A T or liquid crystal display device is used.

The keyboard 23 is composed of numerical keys, symbolic keys, character keys and function keys, and is used for creating and editing a machining program and operating the numerical control device. The software key 24 is provided below the display device 22, and its function is displayed on the display device 22. If the screen of the display device 22 changes, corresponding to the displayed function,
The function of the software key 24 also changes.

The axis control circuit 15 receives the axis movement command from the processor 11, and outputs the axis movement command to the servo amplifier 16
Output to. The servo amplifier 16 amplifies this movement command and drives a servo motor coupled to the machine tool 30,
It controls the relative motion of the tool and the work of the machine tool 30. The axis control circuits 15 and the servo amplifiers 16 are provided by the number corresponding to the number of axes of the servo motor.

The timer 17 divides a clock (not shown) to count the time. This time is, for example, C
This is the elapsed time from the start of operation of the NC. Processor 11
Periodically reads the count value of the timer 17 via the bus 19.

A PMC (programmable machine controller) 18, which is a type of PC, receives M (auxiliary) function signals, S (spindle speed control) function signals, T (tool selection) function signals, etc. from the processor 11 via the bus 19. To receive. Then, these signals are processed by a sequence program and output signals are output to control pneumatic equipment, hydraulic equipment, electromagnetic actuators and the like in the machine tool 30. Further, it receives a signal of a button, a switch signal, a limit switch, etc. of the machine operation panel in the machine tool 30, performs a sequence process, and transfers a necessary input signal to the processor 11 via the bus 19.

In FIG. 2, the spindle motor control circuit, the spindle motor amplifier, etc. are omitted. In the above example, the number of processors 11 is one, but
It is also possible to use multiple processors in a multiprocessor configuration.

Next, a specific procedure of the time management system in the numerical controller having such a configuration will be described. FIG. 3 is a diagram showing an example of the machining program. Processing program 4
An instruction statement TIME designating the execution start time of the program is added to the program of each block of 0. For example, in program number N0001, TIME
A command to start execution of the program PRO1 is issued at t1, that is, at time t1. Similarly, program number N
In 0002, a command to start executing the program PRO2 at TIME t2, that is, time t2 is issued. In addition, the contents of each program are shown here as PRO1, PRO.
Although shown as 2, the actual program is composed of G codes, coordinate commands, speed commands, and the like.

When executing such a machining program 40, the program number N00 which is the first block
Regarding the start of execution of 01, when the start command signal is sent from the PMC 18, the processor 11 causes the time command TIME.
Read t1 and program PRO1. Then, when the count value of the timer 17 reaches the time t1, the processor 11 starts executing the program PRO1 having the program number N0001 at that timing.

When the execution of the program PRO1 is completed,
The processor 11 reads the command TIMEt2 and the program PRO2 at the time of the program number N0002. Then, when the count value of the timer 17 reaches the time t2, the execution of the program PRO2 is started. After that, the program of each block is executed in the same procedure.

As described above, in this embodiment, the execution start time of the machining program is added to the program of the block, and the start time is monitored on the side of the numerical controller, so that the PMC 18 side is burdened. Therefore, the processing time can be accurately controlled.

[0022]

As described above, according to the present invention, the necessary block of the machining program includes the instruction of the execution start time, and when the instructed execution start time is reached, the program of the block is executed. The processing time can be accurately managed without imposing a burden on the side.

[Brief description of drawings]

FIG. 1 is a diagram showing a concept of a function of a CNC time management system of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of hardware of a numerical control device that implements a CNC time management system of the present invention.

FIG. 3 is a diagram showing an example of a machining program.

FIG. 4 is a diagram showing an example of an execution procedure of a conventional machining program.

[Explanation of symbols]

 1 Machining Program 2 Program Reading Means 3 Timer 4 Execution Start Command Means 5 Program Executing Means 11 Processor 12 ROM 13 RAM 17 Timer 18 PMC 40 Machining Program

Claims (2)

[Claims] 1. A CNC time management method for managing the execution start time of a machining program executed by a CNC, a machining program in which a necessary block includes an instruction of an execution start time, and a program for reading the machining program in block units. A reading unit, a timer for counting time, an execution start command unit for issuing an execution start command when the count value of the timer reaches the commanded execution start time, and a program for the block for which the execution start command is issued. A time management system for a CNC, comprising: 2. The time management system for a CNC according to claim 1, wherein the timer is configured to count an elapsed time from the start of operation of the CNC.