JPH07112663B2 - Machine tool fixed cycle controller - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fixed cycle control device for a machine tool, and more particularly to a fixed cycle control device for processing a change in a machining initial point.

[Conventional technology]

Conventionally, when machining based on a machining program on an NC machine tool, parts that have repetitive movements of a predetermined pattern such as hole machining can be set and processed separately as fixed cycles. However, when the condition of the work surface changes due to the attachment of jigs, etc., and it is expected that the amount of tool return will be insufficient at the normal machining initial point, conventionally, it is usual to cancel the fixed cycle. It was

For example, when drilling holes as shown in FIG. 3, the hole depth Z0
When three holes 0, Z01, Z02 are to be drilled in a fixed cycle, the surface of the work itself has irregularities, and the reference initial point A is the maximum surface Z1 with a predetermined allowable value α1
= Z1 + α1 is set. However, the top level ZF of the jig
Since it becomes a higher position, there is a risk of interference by simply returning to the return point R (A) after the second hole machining, so the machining program is shown as an output sample diagram in FIG. As described above, the fixed cycle designated by G81 is canceled by G80, the Z value is designated again as Z (ZF + α3) by the numerical command, and the hole depth Z02 is machined using this as a new initial point.

[Problems to be solved by the invention]

However, if the fixed cycle is canceled, the program is temporarily interrupted and various troublesome procedures are required such as the operator having to re-command. On the other hand, it means that the initial points should be set finely in the machining program, but it is often necessary for the programmer to take into consideration because jigs need to be installed at the machining site suddenly. .

The present invention was devised in view of the above problems, and it is possible to cope with a change in the work surface on site by simply changing the initial point without canceling the fixed cycle, and an extremely efficient machine tool. It is an object of the present invention to provide a fixed cycle control device of the above.

[Means for solving problems]

In the present invention, a means for solving the above problems is to set a fixed cycle program for performing repetitive machining of a predetermined pattern in a machining program stored in a machining program memory and fix the fixed cycle program in the machining program. In a fixed cycle control device of a machine tool that executes the fixed cycle program when a cycle execution command is found,
When the initial point correction data is found in the machining program, the correction data storage means for storing the correction data and the fixed cycle program of the fixed cycle program when the initial point correction data is stored in the correction data storage means Fixed cycle processing means for setting a corrected initial point which is a new starting point of fixed cycle machining from a reference initial point which is a starting point of fixed cycle machining and the initial point correction data, and an initial point in the machining program. When a change command is found and the fixed initial point is set in the fixed cycle processing means, a first return command means for issuing a return command to return to the corrected initial point and the machining program If a cancellation command to change the initial point is found, go to the reference initial point. Second return command means for issuing a return command so as to control the respective means, and central processing means for controlling and controlling each of the means, and returning to the corrected initial point position or the reference initial point position for each machining site machined by the fixed cycle program. A fixed cycle control device for a machine tool characterized by enabling setting.

[Action]

On the control device side, the fixed cycle processing means makes the necessary changes to the reference initial points to set the corrected initial points and performs the required processing, so in the machining program,
It is only necessary to write the initial point change command and the initial point change cancel command, and depending on the result, either the first return command means or the second return command means is selected and the first return command means is selected.
And the second return command means issues a return command to the reference initial point.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an example of the configuration of a fixed cycle control device embodying the present invention. In the figure, the fixed cycle control device also serves as the central processing unit of the host device.
CPU 1, display with keyboard 2 and its input / output circuit 2a, machining program memory 3 in which a machining program is stored, and fixed cycle program memory 4 in which a fixed cycle program for performing repetitive machining of a predetermined pattern is stored. And motor 5, amplifier 5a and compensator 5b
And fixed cycle command registers 6a to 6n for holding the fixed cycle command in the read machining program, and the correction data register 7 for storing the correction data when initial point correction data is found in the machining program.
When the initial point correction data is stored in the correction data register 7, a fixed cycle processing means 8 for setting a correction initial point from the initial point correction data, and a register for reading an initial point change command in a machining program. 9a, a register 9b for reading the initial point change cancel command in the machining program, and the two registers 9a and 9b are respectively connected to read the initial point change command to the register 9a and to the fixed cycle processing means 8. When the modified initial point is set, first return command means 10a for issuing a return command to return to the modified initial point, and when the initial point change cancel command is read to the register 9b, the reference initial point And second return command means 10b for issuing a return command to return to .

FIG. 2 is a flowchart showing an example of the operation of the above device. In the machining program, the approach point is the reference initial point A (see Fig. 3) to the top level ZF of the jig.
It is assumed that a correction initial point W (ZF + α ·) for correcting to a position (ZF + α ·) higher by α · is written. In FIG. 2, when the flow is started, the following fixed cycle command is read from the machining program in the machining program memory 3, for example.

G81; Drill cycle, Spot boring G82; Drill cycle, Counter boring G83; Peck drilling cycle G84; Tapping cycle G85; Boring cycle 1 G86; Boring cycle 2 G87; Back boring cycle G88; Boring cycle 3 G89; Boring cycle 4 These When the fixed cycle command is read, the CPU 1 causes the read fixed cycle command to be held in each of the fixed cycle command registers 6a to 6n, and the fixed cycle machining is performed based on the fixed cycle program memory 4 as the second stage of the flow. To process.

However, as the first step in the flow, the CPU 1 determines whether or not there is an instruction in the machining program that indicates the need for initial point correction data (correction initial point W). Modified initial point W
Are stored in the modified data register 7. That is, the modified initial point W (ZF + α ₃ ) is stored. Then, as a stage of the flow, a machining process by numerical control is performed, and when there is an initial point change command G98 as a stage of the flow, the process returns to the corrected initial point W (ZF + α3) according to the first return command means 10a, When there is no initial point change command G98 or when there is an initial point change cancel command G99, the operation of returning to the reference initial point R (A) according to the second return command means 10b is performed in the first stage of the flow.

The above procedure is repeated until all blocks of the machining program are completed.

FIG. 5 is a sample diagram in which the relevant portion is output when such a procedure is edited in a machining program. It is simplified to 4 steps in comparison with the conventional example shown in FIG. 4 which has 7 steps. It can be understood that the processing time is improved and the processing time is improved.

〔The invention's effect〕

As described above, according to the present invention, it is possible to provide an efficient fixed cycle control device for a machine tool, which can cope with a change in a work surface by changing an initial point without canceling a fixed cycle. .

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flow chart showing an operation procedure of the embodiment, FIG. 3 is an explanatory view of a fixed cycle, and FIGS. 4 and 5 are sample output programs. It is a figure. 1; CPU, 2; Display with keyboard, 3; Processing program memory, 4; Fixed cycle program memory, 5; Motor, 6a to 6n; Fixed cycle command register, 7; Correction data register, 8; Fixed cycle processing means, 9a; initial point change command register, 9b; initial point change cancel command register, 10a, 10b; return command means, 101 to 105; AND gate.

Claims (1)

[Claims] 1. A machining cycle program is set with a canned cycle program for performing repetitive machining of a predetermined pattern from a reference initial point which is the starting point of canned cycle machining. When a canned cycle command is found in the machining program, the stationary cycle program is fixed. In a fixed cycle control device for a machine tool that executes a cycle program, when initial point correction data is found in the machining program, correction data storage means for storing the correction data, and the initial data in the correction data storage means When the point correction data is stored, a fixed cycle processing means for setting a corrected initial point from the initial point correction data; and an initial point change command found in the machining program, and the fixed cycle processing means If the modified initial point is set, First return command means for issuing a return command to return to the corrected initial point, and second return command means for issuing a return command to return to the reference initial point when an initial point change cancellation command is found in the machining program. A return command means and a central processing means for controlling and controlling each of the means are provided, and it is possible to set to return to a corrected initial point position or a reference initial point position for each processing portion processed by the fixed cycle program. Machine tool fixed cycle control device.