JPH02250104A - Reverse operation control system - Google Patents

Abstract

PURPOSE:To execute the reverse operation without generating an interference between heads by storing moving data and waiting command data in a reverse use memory at the time of a progressive motion, and executing the waiting and the retrograde motion, while reading out each stored data in the reverse sequence by a reverse command. CONSTITUTION:A processor 11 reads out a system program stored in a ROM 12 through a bus 21, and in accordance with this system program, the whole operation of a numerical controller 10 is controlled. A part of a RAM 13 corresponds to a reverse use memory, and moving data and waiting command data are stored. In this state, by the reverse command, the moving data and the waiting command data stored in the reverse use memory are read out in the reverse sequence, and while executing the waiting in accordance with the waiting command data, a tool is brought to retrograde along a path shown by the moving data. In such a way, the reverse operation which can prevent an interference between heads can be executed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a reverse operation control method for a numerical control unit (CNC) that operates a multi-head machine tool in reverse, and in particular a reverse operation control system that can prevent interference between heads. Concerning operation control methods.

[Conventional technology]

In multi-head machine tools such as four-axis lathes, it is necessary to prevent mutual interference between the heads. For this reason, for example, N
A waiting command using an M code is inserted into the C program to synchronize the operation timing of each head.

On the other hand, the numerical control unit (CNC) has a reverse function that allows the tool to follow the same path it has passed so far and go backwards.

[Problem to be solved by the invention]

However, because conventional numerical control devices do not execute the waiting command during reverse operation, interference between heads may occur when a multi-head machine tool is operated in reverse.

The present invention has been made in view of these points, and it is an object of the present invention to provide a reverse operation control system that can prevent interference between heads.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a reverse operation control method for a numerical control device (CNC) that operates a multi-head machine tool in reverse.
The tool is moved forward while reading the necessary data for each block from the program and converting it into movement data.The movement data and the waiting command data between the heads are stored in the reverse memory, and the reverse command causes the tool to move forward. The reverse operation is characterized in that the movement data and meeting command data stored in the storage device are read out in the reverse order, and the tool is moved backward along a path indicated by the movement data while meeting according to the meeting command data. A control scheme is provided.

[Effect]

During forward movement, movement data and meeting command data are stored in the reverse memory. When a reverse command is input, each data stored in the reverse memory is read out in the reverse order while waiting and reversing is executed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figure 3 shows a numerical control device (CNC) for implementing the present invention.
) is a block diagram of the hardware.

In the figure, the processor 11 is connected to a ROM via a lotus 21.
The system program stored in 12 is read out, and the numerical control device (CNC) 1 is operated according to this system program.
Controls the entire operation of 0.

A DRAM is used as the RAM 1.3, and temporal calculation data, display data, etc. are stored therein. Also, 17AM13
A part of the memory corresponds to a reverse memory, and movement data and meeting command data are stored therein.

The CMO 314 is a nonvolatile memory backed up by a battery (not shown), and stores tool correction amounts, pitch error correction amounts, NC programs, parameters, and the like.

The interface 15 is an interface for external equipment, and is connected to external equipment 31 such as a paper tape league, a paper tape puncher, and a paper tape league puncher. The Kani program is read from the Gi tape league, and the NC program edited in the numerical control device 10 can be output to the Gi tape puncher.

PMC (7” programmable machine controller) 1
6 is built into the numerical control device 10, and controls the machine side using a sequence program created in a ladder format. That is, the M function, S function, and T commanded by the NC program.
The sequence program is converted into necessary signals on the machine side according to the I10 unit 17 and output to the machine side. This output signal drives a magnet, etc. on the machine side, and operates a hydraulic valve, a pneumatic valve, an electric actuator, etc. It also receives signals from limit switches on the machine side, switches on the machine operation panel, etc., performs necessary processing, and passes them to the processor 11.

The graphic control circuit 18 converts digital data such as the current position of each axis, alarms, parameters, and image data into image signals and outputs the image signals. This image signal is CRT/MD
The data is sent to the display devices 26 of I units 1 to 25 and displayed. The interface 19 receives data from the keyboard 27 in the CRT/MDI unit 25 and sends the data to the processor 1.
Pass it to 1.

Ink face 20 is connected to and receives pulses from manual pulse generator 32 . A manual pulse generator 32 is mounted on the machine operation panel and is used to manually move the machine moving parts precisely.

Axis control circuits 41-44 receive movement commands for each axis from processor 11, convert them into speed command signals, and output them to servo amplifiers 51-54. Servo amplifier 51-54
amplifies the speed command signal to drive the servo motors 61 to 6 of each axis.
Drive 4. The servo motors 61 to 64 have a built-in pulse coder for position detection, and a position signal is feedhacked from the pulse coder as a pulse train. In some cases, a linear scale is used as a position detector. Also, this pulse train is F/V (frequency/velocity)
By converting, a speed signal can be generated. Additionally, a tacho generator may be used for speed detection. In the figure, the feedback path and velocity feedback path for these position signals are omitted. Here, the servo motors 61 and 62 control the tool rest A, and the servo motors 3 and 64 control the tool rest B.

The spindle control circuits 71 and 72 receive spindle rotation commands, spindle orientation commands, etc.
A spindle speed signal is output to spindle amplifiers 81 and 82. The spindle amplifiers 81, 82 receive this spindle speed signal and rotate the spindle motors 91, 92 at the commanded rotational speed. A spindle motor 91 and a spindle motor 92 are connected to a main shaft A and a main shaft B by gears or healds, respectively, and drive heads A and B, which are not shown.

Position coders 101, 102 are coupled to the spindle motors 91, 92 by gears or belts. Therefore, the position coders 101 and 102 rotate in synchronization with the spindles A and B and output feedback pulses, which are read by the processor 11 via the interface 110. This feedback pulse is the turret A
Alternatively, the turret B can be connected to the spindle motor 91 or 92.
It is used to perform processes such as thread cutting by moving in synchronization with the

Next, processing related to reverse operation of the numerical control device described above will be explained with reference to FIGS. 1(a) and 1(b).

FIG. 1(a) is a flowchart during the forward run, and shows the procedure for storing data in the reverse memory. In the figure, the number following S indicates the step number.

(Sll) Read the NG program of head A.

1:s12:l Preprocessing is performed to generate movement data.

(S13) Store the movement data including the meeting command in the reverse memory.

(S14) If a meeting is instructed, the meeting is executed accordingly, and if the meeting is not instructed or the meeting is completed, the process goes to S15.

(S15) Execute pulse distribution based on the movement data and proceed forward.

Note that S21 to S25 indicate processing related to head B,
This process is similar to the processes Sll to S15 regarding head A described above, and the explanation thereof will be omitted.

FIG. 1(b) is a flowchart of processing when a reverse command is issued.

(SIOI:l Read data regarding head A from reverse memory.

1:5102) Determine whether there is meeting command data. If there is meeting command data, the meeting will be carried out at a predetermined location according to the data, and if there is no meeting command data, then 5
Go to 103.

(S103) The read movement data is pulse-distributed in the opposite direction to move backward.

Note that 5201 to 5205 indicate processes related to head B, which are similar to the processes 5L01 to 5105 related to head A described above, and the explanation thereof will be omitted.

〔Effect of the invention〕

As explained above, in the present invention, movement data and meeting command data are stored in the reverse memory during forward movement,
Since each data stored in the reverse memory is read in the reverse order according to the reverse command, waiting and reversing are executed, multi-head machine tools such as 4-axis lathes can be operated in reverse without causing interference between heads. This improves operability.

[Brief explanation of drawings]

FIG. 1(a) is a flowchart of the process in the forward direction according to an embodiment of the present invention, FIG. 1(b) is a flowchart of the process in the backward direction according to the embodiment of the present invention, and FIG. It is a block diagram of the hardware of the numerical control device which is not implemented. 41-44 51-54 61-64 71, 72 81, 82 91, 92 Numerical controller Brossezza OM AM MOS Axis control circuit Servo amplifier Servo motor Spindle control dish circuit Spindle amplifier Spindle amplifier

Claims (1)

[Claims] (1) In the reverse operation control method of a numerical control unit (CNC) that operates a multi-head machine tool in reverse, the operation start command reads the required data for each block from the NC program and sequentially moves the tool while converting it to movement data. and storing the movement data and meeting command data between the heads in a reverse memory, and reading out the movement data and meeting command data stored in the reverse memory in reverse order according to the reverse command; A reverse operation control method characterized in that the tool is moved backward along a path indicated by the movement data while making a meeting according to the meeting command data.