JPS62221007A - Numerical controller capable of changing distribution cycle - Google Patents

Abstract

PURPOSE:To change the distribution cycle in response to the working accuracy of a work and a to improve the working accuracy with a numerical controller, by applying a distribution cycle interruption to a processor from a distribution cycle interruption starting means by a distribution cycle changing instruction contained in a block of a part program. CONSTITUTION:The distribution cycle changing action is monitored by a control program stored in a ROM 2. A processor 1 checks whether a distribution cycle changing command is contained or not in a block of a part program stored in a RAM 3 based on an interpreting routine that decodes the programs of a block. If said command is contained in the block, the interpreting routine is branched into a distribution cycle processing routine. If not, the interpreting routine is branched into a normal routine, for example. In the distribution cycle processing routine, the operation is kept waiting until no acceleration/ deceleration delay is produced any more for the block under execution and then the distribution cycle change request signal REQ is produced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a numerical control device, and particularly to a numerical control device capable of changing the distribution period.

(Prior Art) Conventionally, when machining a workpiece with a machine tool controlled by a single numerical control device, a part program as machining command data is first read into the numerical control device, decoded, and stored in an appropriate location in the internal storage device. Next, this part program is read out one block at a time, and based on the read one block data, a predetermined calculation is performed in the numerical control device, and the result is sent to the servo controller via the interface circuit. It is sent to the unit and rotates the servo motor. At this time, on/off control signals for auxiliary functions and the like are also sent to the high-power circuit via the interface circuit, and predetermined operations are performed. In such a numerical control operation, the command speed of the tool, etc. is f (mm/m1n), and the distribution cycle is ?
(ssec), and the length of one distribution is 1i (IIIll), then M (ma+) = f (mm/m1n) * 1/
(80a 1000) a τ (msec)・
・・・・・・・・・(1) And the conventional numerical control device operates based on the command data of the command movement amount and command speed in this way,
The time required for one distribution length, that is, the distribution period τ, is always constant and cannot be changed.

(Problems to be Solved by the Invention) As can be seen from equation (1) above, in the conventional numerical control device, the length of the distribution cycle is determined by the number of times the numerical control device This affects the processing speed, and also affects the processing accuracy when the command speed f is given. Therefore, with conventional numerical control devices that cannot change the distribution cycle τ, the command speed must be reduced, for example, when the amount of distributed reaction per time is small, that is, when high-precision machining is required. It has its drawbacks.

The present invention aims to eliminate the above-mentioned conventional drawbacks, and its purpose is to improve the machining efficiency using a numerical control device by changing the distribution cycle according to the machining accuracy of the workpiece. The purpose is to provide a numerical control device.

(Means for Solving the Problems) In the present invention, in a computer-configured numerical control device that gives operation commands to controlled equipment according to commands from a part program, means for decoding a distribution cycle change command included in the part program is provided. , distribution cycle interrupt activating means that issues a distribution cycle interrupt to a processor in the time numerical control device when the means decodes the distribution cycle change command;
A numerical control device capable of changing the distribution cycle, characterized in that it has means for executing the distribution operation at the distribution cycle instructed by the command from the distribution cycle interrupt starting means,
This solves the conventional drawbacks as described above.

(Operation) In other words, in the numerical control device of the present invention, the distribution cycle interrupt starting means issues a distribution cycle interrupt to the processor in accordance with the distribution cycle change command included in one block of the part program, so that the processing accuracy can be adjusted according to the machining accuracy of the workpiece. The distribution cycle can be changed.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a system configuration diagram of a numerical control device capable of changing the distribution period of the present invention, and FIG. 2 is a flowchart for explaining the distribution period changing operation of the numerical control device.

In FIG. 1, a processor 1 is controlled by a control program stored in a read-only memory (ROM) 2. As shown in FIG. The tape reader 4 reads the part program stored in the paper tape by punching it. The read data is decoded by processor 1 and stored in random access memory (
RAM) 3 at an appropriate location. The CRT5 can display input data when creating a part program using a numerical control device, display 1 block of read data during NC machining, or display the current position of the tool. do. The keyboard 6 is used for inputting various data. 7 is a non-volatile memory consisting of, for example, a bubble memory cassette or a CMOS cassette, in which part programs are stored in the same way as paper tape;
This part program is read out and decoded by the processor 1, and stored in an appropriate location in the RAM 3.

The position control unit 8 controls the position of the motor, and the speed control unit 9 controls the rotational speed of the motor 10.The position control unit 8 and the speed control unit 9 control the speed based on command data stored in RAMa. The motor 10 is driven by the processor 1 to control the motor 10 to a predetermined position and speed. Motor 1
The rotational speed and position of 0 are respectively determined by the tacho generator 11.
The information detected by the tachometer generator 11 and the position detector 12 is fed back to the speed control section 9 and the position control section 8, respectively. This is a switch for performing the JOG/5TEP transmission reswitch 1 line transmission switch 14 operation, and is configured to send a jig transmission signal to the processor 1 via the DI/Do control section 13. The manual pulse generator 15 is used to manually generate pulses and finely adjust the feed, and is configured to manually send the pulses to the processor l.

The distribution cycle interrupt activation circuit 16 is driven by a distribution cycle change request signal REQ, which will be described later, and receives a 0 distribution cycle change request signal R for interrupting the processor l.
The EQ is used to read one block of data to be executed next from the RAM 5, and when this data includes a distribution cycle change command, the processor 1 decodes and outputs this.

When the processor l accepts the interrupt, it stores the desired distribution cycle τ in a command register (not shown) provided in the position control unit 8 or the speed control unit 9, and controls the motor 1.
0 moves the commanded movement amount under this distribution period τ at a predetermined speed determined by the distribution period.

Next, the operation of changing the distribution period will be explained using FIG.

The distribution cycle changing operation is monitored by a control program stored in the ROMZ. Processor 1 uses an interpretation routine that decodes one block of programs to be executed next among the part programs stored in RAM 3 to determine whether or not a distribution cycle change command is included therein. Make a judgment (Step 1). If it includes a distribution cycle change command,
Branches to the distribution cycle processing routine, and if the program for one block does not include a distribution cycle change command, branches to the normal routine, for example (step 2). Wait until there is no delay in acceleration/deceleration of the block (step 3), then generate a distribution cycle change request signal REQ (step 4)
. As a result, the distribution cycle interrupt activation circuit 16 issues an interrupt to the processor 1, which accepts the interrupt and drives the motor 10 at a variable predetermined distribution cycle.

(Effects of the Invention) As described in detail above, according to the present invention, the parts where high precision machining is required in the program can be machined with high precision without reducing the processing speed by shortening the distribution cycle τ. In other parts, the load on the processor can be reduced by lengthening the distribution cycle.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of a numerical control device capable of changing the distribution period of the present invention, and FIG. 2 is a flowchart for explaining the distribution period changing operation of the numerical control device. 1...Processor, 2...ROM, 3...RAM
, 10... Motor, 16... Distribution cycle interrupt starting circuit.

Claims (1)

[Claims] In a computer-configured numerical control device that gives operation commands to controlled equipment according to commands from a part program, means for decoding a distribution cycle change command included in the part program, and a time value when the means decodes the distribution cycle change command. It is characterized by comprising a distribution period interrupt activation means for applying a distribution period interrupt to a processor in the control device, and a means for executing a distribution operation at a distribution period instructed by a command from the distribution period interrupt activation means. A numerical control device that can change the distribution cycle.