JPS6361126B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric discharge machining method, and particularly to a computer-controlled electric discharge machining method.

Conventionally, this type of electric discharge machining apparatus, as shown in FIG. 1, has a tape reader 10a, an operation board 10b,
A computer section 10 consisting of a setting display board 10c and a calculator 10d, a machine control section 12, and a machine main body section 1.
4 and a system typewriter section 16.

The calculator 10d in the computer section 10 receives NC tape reading information from the tape reader 10a, machine operation commands such as start speed and magnification from the operation board 10b, and mechanical conditions such as backlash from the setting display board 10c. Based on this, a control signal is sent to the machine control section 12. The machine control section 12 controls the machine main body section 14 according to the control signal.

The machine main body 14 includes a frame-shaped movable table 14a,
The plotter table 14b is fixed to it, and the plotter table 14 is fixed to the column 14c and its tip is fixed to the plotter table 14b.
The pen 14d facing b and the table 14a are
Drive motor 1 for moving in the axial direction and Y-axis direction
4e and 14f.

A workpiece 14g is mounted and fixed on the table 14a, and a wire electrode 1 is passed through the workpiece 14g.
4h, this wire electrode 14h and the workpiece 1
4g from a power source (not shown) to generate spark discharge between them, and while cooling this spark discharge portion with machining fluid 14i, motor 14e controlled by a control signal from machine control section 12 , 14f, the table 14b is moved in the X-axis direction and the Y-axis direction to perform machining along the machining trajectory 20.

During processing, the setting display board 10 in the computer section 10
The display above c displays the current machining position, the feed rate of the table 14b, the sequence number of the NC tape, etc. by switching the switch.

The system typewriter section 16 includes a tape reader puncher 16a, a keyboard 16b, and a printer 1.
The computer 10d converts the NC creation language (APT language) read from the tape reader 10a or the keyboard 16b into the NC language, and converts the NC creation language (APT language) read from the tape reader 10a or keyboard 16b into the NC language. The tape is output as an NC tape to the leader puncher 16a.

Although the conventional electrical discharge machining apparatus is configured as described above, it has the following problems during machining.

That is, during machining, the machining surface of the workpiece 14g is always cut off from the outside by the machining liquid 14i, so that the machining shape cannot be directly confirmed visually. For this reason, currently, due to the relative movement of the pen 14d fixed to the column 14c and the plotter table 14b fixed to the table 14a,
The pen 14d is used to draw the same figure as the machining path 20 on the plotter table 14b, but since the plotter table 14b operates exactly the same as the table 14a, two-dimensional machining in the X-axis and Y-axis directions is not possible. I can only express the trajectory. That is, there is a problem that a three-dimensional machining locus such as taper machining cannot be expressed at all.

The present invention has been made to solve the above-mentioned conventional problems, and provides an electric discharge machining method that allows easy confirmation of the shape of a workpiece during machining, especially confirmation of multidimensional shapes such as tapered shapes. The purpose is to

In order to achieve the above object, the present invention provides an electrical discharge machining method in which a workpiece is machined while controlling a machine main body in response to a control signal from a computer section having a computer. A controlled CRT display device displays the planned machining trajectory of the workpiece in advance in a multidimensional manner, and as the machining progresses on the workpiece, a trajectory different from the planned machining trajectory is displayed on the planned machining trajectory. It is characterized by drawing and progressing.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

In FIG. 3, the same parts as in FIG. 1 are given the same reference numerals, and the explanation thereof is omitted.The main body of the machine is the same as the conventional one, so it is omitted in the figure. This shows that. In FIG. 3, a display device 22 is composed of a microprocessor 22a, a main memory 22b, a video memory 22c, and a CRT display device 22d. The microprocessor 22a is
The computer 10d in the computer section 10 is used in a time-sharing manner even during processing, and the entire display device 22 is controlled in accordance with its instructions. Main memory 22b stores all calculation information performed by microprocessor 22a. If one screen is a character display, for example, the video memory 22c has 80 characters x 25 characters.
line, for a graphic display, e.g.
It has addresses corresponding to a matrix of 1024 points x 1024 points, and if the brightness level is, for example, 4 levels, it is composed of a memory with a capacity of 2 bits as 1 word. It is possible to add as many screens as necessary, and any one of them can be installed on the CRT display device 22d.
can be displayed on top.

The apparatus for carrying out the method of this invention is constructed as described above, and next, one embodiment of the method of this invention using the above apparatus will be described.

The shape of the workpiece 14g being processed can be confirmed as described below.

First, before starting machining, the created NC tape is set in the tape reader 10a, the information on the NC tape is read out, and the planned machining trajectory is determined in the two-dimensional direction shown in FIG. 4 or as shown in FIG. 5 using the method described above. 3
Dimensionally stored in one of the video memories 22c. In this case, a video memory 22c having a capacity of 2 bits or more per point is used, and the video memory 22c is stored at the lowest level of brightness other than the zero level.

Then, during actual machining, the brightness of the above planned machining trajectory is increased by one level or more, and the CRT display device 2
Display on 2d. In FIGS. 6 and 7, the dotted line indicates the planned machining trajectory, and the solid line indicates the processed trajectory. Further, by blinking the points a and b currently being processed, it is possible to confirm the processing points even more clearly. Further, in order to indicate the state of the machined object, the machining time up to that point, the remaining scheduled machining time, the distance of the machining trajectory, etc. can be displayed in a blank space on the display screen.

Simultaneously checking the machining states of two or more machine main bodies 14 commanded by the computer 10d or the values indicating the machining states of the machine main bodies 14 obtained from the direct display meter is performed as follows.

That is, the values commanded by the computer 10d are sequentially read out at appropriate intervals and written into one of the video memories 22c. In addition, the value read directly from the meter is
The analog signal applied to the meter is A/D converted, digitized, and directly written into the video memory 22c. Next, by reading out the contents of this video memory 22c on a single display screen, it is possible to simultaneously compare and check two or more machining states of the machine body 14 during machining.

As explained above, according to the method of the present invention, the CRT, which is controlled in a time-sharing manner by a computer,
The display device displays the planned machining trajectory of the workpiece in advance in a multi-dimensional manner, and as the machining of the workpiece progresses, the machine progresses by drawing a display trajectory different from the planned machining trajectory on the planned machining trajectory. For example, a three-dimensional shape with a taper can be displayed two-dimensionally as a perspective view, which has the advantage of improving the visibility of the processed shape.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an overview of a conventional electric discharge machining device, Fig. 2 is a display state diagram showing a machining shape in the electric discharge machining device, and Fig. 3 is a block diagram of an electric discharge machining device used in the method of the present invention. , FIG. 4 is an explanatory diagram of the display of the machining shape in the electrical discharge machining apparatus, FIG. 5 is a diagram of a specific display state thereof, and FIGS. 6 and 7 are diagrams of other display states. In the figure, 10 is a computer section, 12 is a machine control section, 1
4 is a machine body, 16 is a system typewriter section, 18 is a punch shape, 20 is a machining path, 22 is a display device, and 22d is a CRT display device. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In an electric discharge machining method in which a workpiece is machined while controlling the main body of the machine in response to a control signal from a computer section having a computer, a CRT display device controlled in a time-sharing manner by the computer is , the planned machining trajectory of the workpiece is displayed multidimensionally in advance, and as the machining of the workpiece progresses, the process progresses on the planned machining trajectory by drawing a trajectory different from the planned machining trajectory. Characteristic electric discharge machining method.