JPH03119407A - Numerical control device - Google Patents

Abstract

PURPOSE:To perform quick and safe check of a working program by carrying out the relative movement by an optional amount of shifting unit between a subject to be worked and a working tool in an optional range and stopping. CONSTITUTION:When a check start switch 49 is pushed, a working program checking device 47 moves a table while interpreting the working program. Meanwhile it is checked whether a nozzle is presently kept within a set range or not. If so, the nozzle is moved by a set amount via a unit shift amount setting device 61 and then stopped. When the switch 49 is pushed again, the table is moved by a set unit amount and stopped again. Thus the table is moved by a unit shift amount within a set range with each push of the switch 49. Thus an operator can judge whether the check should be continued or suspended before the actual occurrence of an interference. As a result, the working program can be checked quickly and safely.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an NC device that can safely and quickly inspect a machining program before starting machining.

[Conventional technology]

3゜Figure 4 is a configuration diagram showing, for example, a conventional wire electric discharge machining device, and in the figure, (1) indicates a workpiece to be machined;
(2) is a table on which the workpiece (1) is placed and moves freely on the two-dimensional plane of the X and Y axes, and (3) is a table that fixes the workpiece (1) as a workpiece to the table (2). tool, (4) is a wire electrode corresponding to a processing tool, and (5) is a workpiece (1
) and the wire electrode (4), (6) is the X-axis motor that drives the table (2) in the X-axis direction, and (7) drives the table (2) in the Y-axis direction. Yes
axis motor, (8) is a nozzle that supplies machining liquid (9) to the machining gap formed between the workpiece (1) and the wire electrode (4), (10) is the X-axis motor (6), the Y-axis motor ( 7)
(11) is a machining fluid device that supplies machining fluid (9) to the nozzle (8).

FIG. 5 is a diagram showing the detailed configuration of the NC device (10). In the figure, (41) is a CRT that displays the status of the wire electrical discharge machining device, and (42) is a CRT that displays the operation of the NC device (10). The operation switch panel (43) is the processing fluid device (11)
), the machining fluid control device (44) controls the machining power supply (5
), (45) is a motor control device that controls the X-axis motor (6) and Y-axis motor (7), and (46) is a movement speed command that instructs the movement speed of the table (2). The device (47) is a function that interprets the machining program and creates data for moving the table (2), a function that sets the feed speed of the table (2) to a prespecified speed for inspection, and a machining program. A machining program inspection device (48) has a function of ignoring commands to apply a specified machining voltage or supply machining fluid (9), etc., and (48) sets the NC device (10) to machining program inspection mode. (49) is an inspection start switch that instructs the start of machining program inspection;
(50) is an interruption switch that commands temporary interruption of machining program inspection.

Next, the operation will be explained. In a wire electrical discharge machining apparatus equipped with an NC device (10), one of the steps when machining a workpiece (1) is to inspect a machining program.

The machining program is usually created by an automatic program creation device, outputted to an information medium such as paper tape, FLD, C(3), MT, etc., and then, prior to machining, these information media are stored in the NC device (10). is input from a reading device (not shown) to an NC device (10).
The machining program is stored in a memory (not shown), and during machining, the machining program is read from the memory, interpreted, and machining is performed. Alternatively, the machining program is not stored in the memory, but is sequentially read out from the information medium during machining, interpreted, and machined.

In order to perform machining reliably without failure, it is necessary to check whether the machining program has been created as intended. As the first step of the inspection, first, in the automatic program creation device, the machining shape indicated by the machining program is drawn on a graphics device or the like and inspected.

As the second stage of inspection, the machining program is transferred to the NC device (1
0) and inspected in the NC device (1O). Two methods are usually used in this case.

The first method is to display the shape indicated by the machining program on the CR7 display device (41) provided in the NC device (10),
This is a method of checking whether it is as intended or whether there are any errors (4). In this case, the table (2) is usually not moved and confirmation is performed only by the data displayed on the CR7 display device (41).

However, this method does not actually move the table (2), so the currently set workpiece (1) or jig (
3) and the nozzle (8), it is not possible to inspect how the positional relationship will be when actual processing is performed. However, during machining, the nozzle (8) is connected to the workpiece (1).
Alternatively, it is essential to confirm in advance that there will be no interference with the jig (3). There is no problem if there is no obvious possibility of interference, but if the nozzle (8) passes close to the jig (3), or if the thickness of the workpiece (1) differs depending on the location. In order to do so, it is necessary to actually move the table (2) during the inspection stage to confirm that there is no interference. For this purpose, there is a second method shown below.

The second method is to use the table (2
), and in this case, the wire electrode ( 4) Interpret the machining program with no tension applied and no machining voltage applied, and inspect the machining program by moving the table (2). Further, the feed rate of the table (2) is not the speed specified in the machining program, but is usually set in advance for inspection and is much faster than the feed rate during machining. This is essential for shortening the time required for inspection and increasing inspection efficiency.

Naturally, when the table (2) is moved without machining during inspection, it can be moved much faster than when the table (2) is moved while machining is being performed.

The second inspection method in the above-mentioned NC device [10] is as follows:
Compared to the inspection in an automatic program creation device or the first inspection method in an NC device (IO), this is the most reliable inspection method because it is performed in a form that is closest to processing.

[Problem to be solved by the invention]

Since the conventional NC device is configured as described above, when the nozzle (8) is about to collide with the workpiece (1) or the jig (3), the interrupt switch (50) is pressed by the operator. However, in order to prevent damage, the operator may not be able to do so in time and cause damage to each of the above, or in order to prevent damage, the operator may have sufficient time to press the interrupt switch (50).
As a result of reducing the moving speed of the table (2), there was a problem to be solved in that a large amount of inspection time was consumed.

This invention was made in order to solve the above problems, and it is possible to inspect machining programs safely and in a short time.
The purpose is to obtain a C device.

[Means to solve the problem]

The NC device according to the present invention controls the machining of the workpiece while moving a machining tool relative to the workpiece along a machining program trajectory, and in which a specific area is set on the relative movement trajectory. a setting means for setting and also setting an m-position movement amount of the relative movement in the area;
The apparatus includes a control means for executing a relative movement operation by the set unit movement amount within the area, and a command means for instructing the control means to start the relative movement operation.

[Operation] In the present invention, based on the unit movement amount of relative movement within the specific area set by the setting means, the control means executes a relative movement operation by the unit movement amount within the area according to the command from the command means. do.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (61) is a unit movement amount setting device corresponding to a setting means for setting a specific range within the movable range of table (2) and a unit movement amount in that range, and (62) is a unit movement amount setting device ( 61) is a unit movement amount moving device corresponding to a control means that moves the table (2) by a specified unit movement amount and then stops it.

Fig. 2 is a detailed view showing how the workpiece (1) is fixed to the table (2) by the jig (3). In the figure, (71) is the movable range of the table (2), in other words. The movable range of the nozzle (8), (72) is the machining trajectory where the nozzle (8) moves according to the instructions of the machining program, (73)
) are interference caution areas where the jig (3) and the nozzle (8) may interfere, and in this embodiment, there are two areas. FIG. 3 is a flow chart for explaining one embodiment of the present invention.

The hardware of the wire electrical discharge machining apparatus in this embodiment is the same as that of the conventional example shown in FIG. 4, so illustration thereof is omitted. Further, since the same reference numerals as in FIG. 4 and FIG. 5 showing the conventional NC device (10) indicate the same or corresponding parts, the explanation thereof will be omitted.

Next, the operation will be explained. After setting the workpiece (1), the operator turns on the inspection mode switch (48), which specifies the machining program inspection mode, and turns on the inspection start switch (48), which corresponds to the command means to specify the start of inspection.
49) to start the inspection, but before this, the NC device (10 ) operation switch panel (42)
Set from. For example, in Figure 2, the interference caution area (73)
It is appropriate to set the above range within the range shown in .

Next, the operation will be explained using the flowchart shown in FIG.

Inspection start switch (49) as shown in step (90)
When is pressed, the machining program inspection device (47) moves the table (2) while interpreting the machining program, as shown in step (91). Next step (92)
As shown in the figure, when the machining program indicates the end of program execution, the inspection ends. At this time, control is performed so that commands included in the machining program, such as a command to turn on the machining power and a command to turn on the machining fluid, are not executed. Then step (
93), while moving, the currently set range (7
3) Check whether the nozzle (8) is present in
If it is within the above range, it moves by the amount of movement set by the unit movement amount setting device (61) as shown in step (96), and stops at step (96). The operator felt that the table (2) had stopped moving.
10) It is possible to know when interference has entered a range that requires caution, and by setting the unit movement amount to several microns to several tens of microns, it is possible to easily stop the interference before it actually interferes. After this, when the test start switch (49) is pressed again as shown in step (90), steps (91), f92), (93), (9
4), as shown in (96), it moves by the set unit movement amount and stops again. The range set like this (7
3), each time the inspection start switch (49) is pressed, it moves by the unit movement amount and then stops, so the operator has plenty of time to decide whether to continue or interrupt the inspection before interference actually occurs. can do. Also, step (
As shown in 95), when the puller leaves the set range (73), the speed becomes the inspection speed and it moves continuously, so
Areas where there is no risk of interference can be inspected in a short time.

If the operator determines that there is interference, he or she takes measures such as resetting the workpiece (1) or modifying the machining program, and then starts the inspection again from the beginning.

Range (73) (1) set to the end of the machining program
1) If the operator does not interfere, or if the operator determines that there will be no interference and continues the inspection, and the inspection ends without actually interfering, the inspection is complete.

Even when machining is completed and another workpiece (1) is to be machined, if the position of the jig (3) does not change significantly, the set range and unit movement amount can remain as they are, so it is necessary to reinstall the jig (3). No need to set.

In addition, in the above embodiment, the case of a wire electric discharge machining apparatus using an NC device was explained, but an NC electric discharge machining apparatus,
A similar effect can be achieved in a machining center or the like using an NC device.

Further, in the above embodiment, the setting range (73) was explained as two locations, but it may be three or more locations, or one location.
It goes without saying that the magnitude of the unit movement amount can be arbitrarily set in each range.

[Effects of the Invention] As described above, according to the present invention, the relative movement between the workpiece and the processing tool is performed by an arbitrary unit movement amount in an arbitrary range and then stopped. Therefore, there is an effect that a machining program can be inspected safely and in a short time.

[Brief explanation of drawings]

FIG. 1 is a detailed configuration diagram showing an NC device according to an embodiment of the present invention, FIG. 2 is a detailed diagram showing how a workpiece is fixed to a table by a jig according to an embodiment of the present invention, and FIG. 3 is a flowchart showing the operation of this invention, No. 4
The figure is a configuration diagram showing a conventional electrical discharge machining device, and FIG. 5 is a detailed configuration diagram showing a conventional NC device. In the figure, (1) is the workpiece, (4) is the wire electrode, (
10) is an NC device, (49) is an inspection start switch, (6
1) is a unit movement amount setting device, and (62) is a unit movement amount moving device. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] Controlling the machining of the workpiece while moving the machining tool relative to the workpiece along the machining program trajectory
In the C device, a setting means for setting a specific area on the relative movement locus and setting a unit movement amount of the relative movement in the area, and a relative movement operation within the area by the set unit movement amount. 1. An NC device comprising: a control means for causing the control means to execute; and a command means for instructing the control means to start a relative movement operation.