JPH01297705A - Method for generating nc program for wire cutting electric discharge machine - Google Patents

Abstract

PURPOSE:To perform the automatic generation of an NC program by storing graphic element data in sequence of continuity, and designating a working start point and a working direction. CONSTITUTION:A graphic is inputted to a display according to a working drawing by using an input device, and also, the graphic data of each graphic element is filed in an external memory device 4. Next, each graphic element is arranged in sequence of continuity as a graphic A, and is stored in the external memory device 4. After that, an operator magnifies or reduces the graphic A in an arbitrary offset quantity (f) (clearance quantity) at need. Following that, the operator designates a part to be worked first. Thereby, two start points (difference of clearance) being positioned inside and outside the graphic A are displayed on the bisector of the graphic element and in the neighborhood of the said graphic element. Either two points is selected, then, working is started.

Description

DETAILED DESCRIPTION OF THE INVENTION [Invention 1] (Industrial Application Field) The present invention relates to a method for automatically creating an NC block diagram for a wire-cut electrical discharge machine using a computer.

(Prior Art) When creating an NC program for a wire-cut electric discharge machine using a computer, it is generally created using an automatic programming language such as APT.

In this system, a programmer creates a part program from a processing drawing using an automatic programming language such as APT. Next, when this part program is input into the NC program creation computer, the NC
A program is created and output as an NC tape.

(Invention or problem to be solved) However, the creation method described in item 1 requires learning how to create part programs using an automatic programming language such as APT, and specialized knowledge of wire-cut electrical discharge machines. I can only create programs.

In addition, since the program is created by reading the drawings from the processing drawings, there are many cases where the shapes are weighted differently from those in the processing drawings due to errors in figure reading or program creation. Ta.

Therefore, an object of the present invention is to create an NC program for a wire-cut electrical discharge machine that can easily and accurately create an NC program without having to acquire an automatic programming language such as APT or have specialized knowledge of wire-cut electrical discharge machines. Provides instructions on how to create it.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the method for creating an NC program for a wire-cut electric discharge machine of the present invention inputs a figure consisting of a plurality of figure elements for each figure element. Then, the input graphical elements are arranged in consecutive order as shapes and recognized, and the graphical element of the part to be processed first is selected, and a machining start point is set near the selected graphical element.
Further, by selecting one of the two graphic elements that are continuous on both sides of the machining start graphic element, the direction of machining progress is determined, and then an NC program is automatically created.

(Operation) According to the second means, the graphic element data is stored in consecutive order, and the machining start point, the first part to be machined, and the direction in which the machining is to proceed are specified, so the rest is done by the computer. An NC program is automatically created by the processing program.

(Example) An embodiment of the present invention will be described below based on the drawings.

First, the hardware configuration of the CAD/CAM system shown in FIG. 8 will be explained. 1 is an input device such as a keyboard or a tablet; 2 is a computer; 3 is an output device such as a display or a paper tape perforator; Executes processes such as creating NC programs for electrical discharge machines.

Now, the procedure for creating an NC program using the above CAD/CAM system will be explained with reference to flowchart 1 in FIG. Here, it is assumed that a metal plate is processed into the shape shown in FIG. This figure A in FIG. 2 has a plurality of figure elements, namely three vertical lines 5 to 7 and three horizontal lines 8 to
0 and one circular arc 1].

Now, in order to create an NC program, the input device 1 is used to create the figure shown in FIG. 2 on the display according to the processing drawing (manual operation 1).

This graphic creation is performed interactively for each graphical element of graphic A while selecting elements such as straight lines, curves, and circles using the tablet. By creating this figure, the computer 2
files the graphic data of each graphic element in the external storage device 4. In this case, the graphic data includes (-J) numbers in the order created by interactive input, line types such as straight lines, curves, or circles, and coordinate values that can express the figure of the line type.

When the graphic A is created as described above, the computer 2 arranges the graphic elements in a continuous order as the graphic A and files them in the external storage device 4 according to the processing program (processing step 1).

The reason why this kind of rearrangement is necessary is that the order in which each graphical element is created in the interactive manual format is, for example, first vertical lines 5 to 5.
7 is created all at once, then horizontal lines 8 to 10 are created all at once, and finally arc 1] is created, and so on. Since it is random, shape A is made up of consecutive graphic elements in this order. This is to make people aware of this.

Next, the operator enlarges or reduces the figure A by an arbitrary offset iA f as necessary (manual operation 2
). This enlargement or reduction of the figure A is carried out in order to provide a clearance because if a press-type punch or die is to be formed from the figure A, an appropriate clearance is required between the two. Figure B indicated by a two-dot chain line in FIG. 3 is a reduced version of figure A.

In addition, when enlarging/reducing figure A, the size to be processed is figure A.
If so, there is no need to do so.

Thereafter, the operator first specifies the part to be added from among each graphical element (manual operation '3).

Now, assume that graphic element 4 is designated as the first location to be processed. Then, as shown in FIG. 4, the computer 2 displays two starting points on the display that are located at the 2-segment line 2 of the graphic element 4 and located inside and outside of the graphic A, respectively, in the vicinity of the graphic element 4. Display points PI and P2.

Therefore, the operator selects one of them as the addition-1° starting point (manual operation 4).

This machining start point is the position where the machining wire of the wire-cut electric discharge machine is passed through and the hole is pressurized. Therefore, as shown in FIG. 6, if you want to obtain a workpiece surrounded by figure A, point P2 located outside figure A should not be selected, and also point P2 located outside figure A should not be selected. As shown in Figure A, if you want to obtain a workpiece 1'3 with holes of the same shape as the figure A, you should not select the point P1 located inside the figure A.

After selecting [+]-L start point], the operator:
It is selected whether the electric discharge machining is to proceed in the backward direction or in the reverse direction along the continuous graphical elements (manual operation input 5). The selection can be made by specifying either of the graphic elements 1 and 2 that are continuous on both sides of the graphic element 4 selected as the processing start graphic element. Here, for example, if graphic element 2 is selected, the direction of pressurization will be clockwise, and as shown in FIG. Specify point P2).

When the machining progress direction is selected in this way, the computer 2 follows the processing program so that the machining progresses in the H, i direction along each graphic element 1 arranged in continuous jllo. N of wire cut electric discharge machine
A C program is created and the result is output as a punched tape by a punching machine (processing step 2).

In this way, according to this embodiment, it was necessary to read the length of each figure element, the reference value, the line type, etc. from the conventional processing drawing and create a bart block using an automatic programming language such as APT. Unlike the conventional programming language, there is no need to use a programming language such as APT, and you can actually create a display based on the processing drawing.Secondly, create a figure A that is identical to that figure, and then, based on this figure A, Create offset shapes, determine the machining start point,
Alternatively, since the direction in which the machining progresses is determined, the chances of making mistakes such as misreading the drawings are greatly reduced. Therefore, it is not necessary to learn an automatic programming language such as APT, and specialized knowledge of wire-cut electric discharge machines is not required, and NC programs can be created easily and accurately.

Incidentally, if the offset amount or the processing start graphic element can be manually determined at the time of creating the figure A, the automation rate will be higher. In addition, it would be possible to create a NC program by inputting a part program created using an automatic programming language such as APT.
/CAM system.

[Effects of the Invention] As explained above, according to the present invention, a figure made up of a plurality of figure elements is manually input into figure elements, the manually-generated figure elements are arranged in consecutive order as figures, and the figures are recognized first. Select the graphical element to be machined, set the machining start point near the selected graphical element, and select one of the two graphical elements that are continuous on both sides of the old machining start graphical element. The machining progress direction is determined by 1. Later, we started creating NC programs automatically, so even if you have not learned an automatic programming language such as APT or have specialized knowledge of wire-cut electrical discharge machines, you can easily and accurately create NC programs. It has an excellent effect of being able to do a lot of things.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a flowchart 1 for creating an NC block diagram, and Fig. 2 is a flowchart for creating a figure representing a machining shape. 10 - Front view of ispray Figure 3 is a diagram equivalent to Figure 2 shown with offset figures, Figure 4 is a diagram equivalent to Figure 2 when the start point is displayed, and Figure 5 is equivalent to Figure 2 when the machining progress direction is determined. 6 and 7 are perspective views showing different workpieces, respectively, and FIG. 8 is a hardware configuration diagram of the CAD/CAM system. In the figure, 1 is an input device, 2 is a computer, 3 is an output device, 4 is an external storage device, 5~ ] 1 is a graphic element, Pl, , P
2 is the processing start point. Agent Patent Attorney Noriyuki Chika

Claims (1)

[Claims] 1. N of wire cut electric discharge machine by computer
In a program that automatically creates a C program, a figure consisting of multiple figure elements is input for each figure element, and the input figure elements are arranged in consecutive order as figures and recognized, and the figure element of the first place to be processed is , set a machining start point near the selected graphical element, and determine the machining progress direction by selecting one of two graphical elements continuous on both sides of the machining start graphical element, A method for creating an NC program for a wire-cut electrical discharge machine, comprising automatically creating an NC program thereafter.