JPH04332005A - Program checking device for nc device - Google Patents

Abstract

PURPOSE:To reduce operator's load for trial cutting, to shorten required time for program check and to prevent the generation of collision at the time of quick traverse due to misprogramming. CONSTITUTION:An NC device 15 for decoding a working program 17 and applying a feeding command of a tool rest 2 is provided with a preceding position stopping means 19 for recognizing a quick traverse command 17a of the working program 17, operating a position preceding the positioning point of the command 17a only by a set point L in the feeding direction and stopping feeding based upon the command 17a on the operated preceding position. This program checking device is provided with a trial cutting mode selecting means 22 for activating the means 19 only at the time of mode selection.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program checking device for an NC device used in lathes and other machine tools in general.

0002

[Prior Art] Normally, when creating a machining program to cut a workpiece, it is not always guaranteed that the machining program will perform proper cutting.
First, the program is checked by trial cutting a workpiece using the machining program and monitoring the movement of the tool at that time.

Among the movements of the tool in such trial cutting, for example, in a rapid forward movement in which the tool 34 approaches the vicinity of the workpiece W from the movement start position Q through the feed path A shown in FIG. If there is an error in the values (a, b), the tool 34 will collide with the workpiece W, resulting in damage to the tool 34 and the machine.

[0004] Conventionally, therefore, in the rapid traverse operation in the trial cutting, the operator operates a speed adjustment switch such as a feed override switch that variably adjusts the feed rate of the tool 34 to slow down the rapid traverse operation speed. When the tool 34 approaches the workpiece W, feeding is stopped. While avoiding collisions by performing such operations, directly visually observe the positional relationship between the cutting edge of the tool 34 and the workpiece W, or compare it with the coordinate data on the monitor screen, and determine the stop coordinate value ( The suitability of a and b) is determined.

[0005]

[Problems to be Solved by the Invention] However, in the conventional program check measures described above, the tool 34
It is necessary to keep an eye on the movements of the operator, which not only takes time but also places a heavy burden on the operator.

[0006] An object of the present invention is to prevent collisions during rapid feed during trial cutting, reduce the burden on the operator, and
It is an object of the present invention to provide a program check device for an NC device that can shorten the time required for program check.

[0007]

[Means for Solving the Problems] The structure of the present invention will be explained with reference to FIG. 1 corresponding to an embodiment. This program check device decodes the machining program (17) and deciphers the tool post (
The NC device (15) that gives the feed command (2) recognizes the rapid feed command (17a) of the machining program (17), and moves the set value (L) forward in the feed direction from the positioning point of this rapid feed command (17a). A near position stopping means (19) is provided which calculates the position and stops the feed according to the fast forward command at this near position. Furthermore, trial cutting mode selection means (22) is provided for activating this front position stop means (19) only when mode is selected.

[0008]

[Operation] When checking the machining program (17), the trial cutting mode selection means (22) is used to stop the near position (
Activate 19). As a result, the front position stopping means (19) is activated by the fast forward command (1) of the machining program (17).
7a), calculates a position that is a set value (L) before the positioning point specified by the fast-forward command (17a) in the feed direction, and stops the feed according to the fast-forward command (17a) at this near position. Therefore, even if there is a slight error in the coordinate data of the positioning point in the rapid-forward command (17a), collision of the tool with the workpiece or the like can be avoided, and the program can be checked without worrying about collision.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 4. In FIG. 1, a lathe 1 is a turret lathe in which a feed plate 3 of a turret 2 is installed on the side of a headstock 4, and a spindle chuck 5 is provided with chuck claws 5a for gripping a workpiece W. The feed platform 3 includes a turret slide 8 installed on the rail 7 of the bed 6 and a turret slide 8.
It consists of an index housing 9 installed on top via a rail (not shown) and the turret 2. The turret slide 8 and the index housing 9 are fed in the X and Z directions by an X-axis servo motor 12 and a Z-axis servo motor 13 via feed screws 10 and 11, respectively. The turret 2 is drum-shaped with a polygonal front face, and is indexed and rotated about a horizontal axis by an indexing device built into the index housing 9. A tool 14 is attached to each peripheral surface portion of the turret 2.

The NC device 15 is a control device that gives a feed command for the turret 2, which is a tool rest, and is equipped with a front position stopping means 19. The arithmetic control unit 18 is a means for analyzing and executing the machining program 17 written in the machining program memory 16, and operates the X-axis servo motor 12 and Each axis servo motor, such as the Z-axis servo motor 13, is driven.

The front position stopping means 19 is activated when the trial cutting mode is selected by the trial cutting mode selection means 22 provided on the operation panel 21, and is activated when the trial cutting mode is selected by the trial cutting mode selection means 22 provided on the operation panel 21. This is means for temporarily stopping the feed based on the rapid feed command 17a at a position a set value L before the positioning point in the feed direction. This front position stop means 19 includes a fast-forward command recognition means 23 that recognizes the fast-forward command 17a of the machining program 17;
A near position calculating means 24 calculates a position a set value L in the feeding direction from the positioning point specified by the rapid feed command 17a, and a calculation control unit 18 when the tool 14 is rapidly fed to the calculated near position. A stop command means 25 for giving a stop command is provided.

The operating panel 21 is provided with a restart switch 26 for restarting the rapid feed of the tool 14 after it is temporarily stopped by the front position stop means 23 in the trial cutting mode.

The operation of the above configuration will be explained. When checking the machining program 17 by trial cutting, the trial cutting mode is selected by the trial cutting mode selection means 22, the front position stopping means 19 is activated, and the workpiece W for trial cutting is mounted on the spindle chuck 5. In this state, operation of the lathe 1 is started.

FIG. 2 is a diagram showing an example of a feed path when the cutting edge of the tool 14 is rapidly moved from the movement start position Q0 toward the cutting start position of the work W, that is, the positioning point Q2, according to the rapid feed command 17a of the machining program 17. It is. This positioning point Q2 is specified, for example, by the preparation function words G0Xa, Zb; of the NC code, where a is the coordinate in the X direction of the cutting edge of the tool 14, and b is the coordinate in the Z direction.

When this rapid forwarding is performed, that is, when the arithmetic control unit 18 executes the rapid forwarding command 17a of the machining program 17, the front position stopping means 19 performs the operation shown in the flowchart of FIG. That is, the fast-forward command recognition means 23 recognizes the fast-forward command 17a (S1),
The coordinate values (a, b) of the positioning point Q2 designated by the fast-forward command 17a are confirmed (S2).

Next, the front position calculation means 24 calculates a position Q1 that is a set value L in the feeding direction from the positioning point Q2.
Calculate the coordinate values (a-LX, b-LZ) (S3
). However, LX and LZ are the X-axis component and Z-axis component of the distance L on the feed path in this case.

Tool 1 sent by rapid feed command 17a
The cutting edge of No. 4 has the calculated coordinate value (a-L) on the feed path.
When reaching the point ( As a result, the tool 14 stops at the front position Q1. At this time, the operator
By visually checking the position extending by the set value L in the feed direction from the cutting edge position Q1, that is, the positioning point Q2 specified by the rapid feed command 17a, the suitability of the specified positioning point Q2, that is, the suitability of the machining program 17, can be determined. You can check. For example, in FIG. 2, the visually confirmed positioning point Q2 corresponds to the cutting start position with respect to the work W, so it can be determined from this that the machining program 17 is appropriate. Furthermore, by displaying the current position at the time of stop and the coordinate values of the positioning point Q2 on the monitor screen, it is also possible to compare these coordinate values and determine suitability.

On the other hand, when the positioning point Q2 that is visually confirmed from the front position Q1 is a position that extends far into the workpiece W as shown in FIG. 3, for example,
The coordinate values (a, b) of the designated positioning point Q2 are inappropriate values, and from this it can be determined that the machining program 17 is inappropriate. If it is determined that the machining program 17 is inappropriate, the operation is stopped. This makes it possible to avoid the tool 14 colliding with the workpiece W or the like.

When the machining program 17 is determined to be appropriate, the restart switch 26 of the operation panel 21 is turned on to resume operation, and the tool 14, which was stopped at the front position Q1, is moved to the fast forward position of the machining program 17. Movement is resumed in accordance with command 17a, and subsequent operations are performed from the middle of fast forwarding. Note that a timer means may be provided in the front position stop means 19 so that the restart is automatically performed after a certain period of time after the fast forwarding is stopped.

This program check device can thus prevent the tool 14 from colliding with the workpiece W during rapid traverse due to a program error, and therefore the program can be checked without operating a speed adjustment switch or the like as in the conventional case. Therefore, checking can be done easily and in a short time.

[0021]

[Effects of the Invention] The program check device for an NC device of the present invention is provided with a near-position stopping means that recognizes a fast-forwarding command in a machining program and stops it at a position a set value before the positioning point of the fast-forwarding command, thereby preventing program errors. There are fewer problems of collisions caused by collisions, and the suitability of the machining program can be determined simply by visually comparing the stop position and the set value without operating a speed adjustment switch or the like. Therefore, there is an effect that program checking can be performed easily and in a short time.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of a tool feeding path in the rapid feed operation.

FIG. 3 is an explanatory diagram showing another example of the tool feeding path in the rapid feed operation.

FIG. 4 is a flowchart showing the operation of the front position stopping means during a fast forward operation.

FIG. 5 is an explanatory diagram showing a conventional program check operation.

[Explanation of symbols]

1...Lathe, 2...Turret (tool post), 3...Feed stand, 5...
Spindle chuck, 12...X-axis servo motor, 13...Z-axis servo motor, 14...Tool, 17...Machining program, 17
a... Rapid feed command, 19... Front position stop means, 22... Trial cutting mode selection means, 23... Rapid feed command recognition means, 24...
Front position calculation means, 25...Stop command means, 26...Restart switch, Q0...Movement start position, Q1...Positioning point, Q2...Near position, L...Setting value, W...Work

Claims (1)

[Claims] [Claim 1] An NC device that decodes a machining program and gives a turret feed command, recognizes a fast feed command in the machining program, and calculates a position a set value in the feed direction from the positioning point of this fast feed command. A program for an NC device, comprising a near position stopping means for stopping the feed according to the rapid feed command at a position before the lever, and a trial cutting mode selection means for activating the near position stopping means only when a mode is selected. Check device.