JPH052823U - Numerical control data generator for wire electrical discharge machining - Google Patents

Abstract

(57) [Summary] [Purpose] When processing a die for wire machining, the operator omits the work of extracting the die. [Structure] When machining a wire cutting die shape, divide the die into a plurality of pieces to the size at which the cutting scraps will automatically fall off due to water pressure at the processing end point, and process each shape sequentially NC data. NC data creation method for wire processing that is automatically created [Effect] When the punching die is processed, the scraps fall out automatically, so there is no need for the operator to pull out the scraps by hand, and the wire processing becomes unmanned. It will be possible.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an NC data creation device for wire electrical discharge machining that creates NC data of a punching die shape.

[0002]

[Prior Art]

 As shown in FIG. 7, the die CAD / CAM system 1 includes a die drawing (CAD system) 1a and an NC data creation system (CAM system) 1b that creates NC data 2 for die processing. I have it. The systems 1a and 1b may be configured by different devices.

In the die CAD / CAM system 1, the CAD system 1a designs the product arrangement, the number of stages, the pitch, etc. based on the input product shape. After that, the CAM system 1b defines the processing order, processing speed, approach point, etc. based on the shape, and automatically creates and outputs NC data. Since the punching die shape is processed by the wire cut electric discharge machine, the CAM system 1b creates and outputs NC data for wire cut. The CAM system 1b creates NC data by directly using the shape data created by the CAD system 1a as a trajectory of a wire. For example, if the cutting die shape PRF1 shown in FIG. 8 is created by the CAD system 1a, the CAM system 1b creates the NC data of this cutting die shape in the order of points P1 → P2 → P3 → P4 → P5 → P1. To do. Now, as a method of wire electric discharge machining, there is a method of leaving uncut and escaping. In this machining method, as shown in FIG. 9, the uncut amount K (| P6-P1 | = K) is provided immediately before the machining end point P1 of the shape PRF2, and the clearance amount N (| P7-P6 | = from the shape). N) is provided to prevent the operator from accidentally cutting off the shape while keeping it unstable. Another function of wire electric discharge machining is expansion machining. As shown in FIG. 9, this function is a machining method in which the machining locus is obtained by sequentially calculating the machining shape deviated from the final machining shape by the pitch amount P inward. In actual processing, the wire is sequentially processed from the center of its shape to the outside, with the shape offset by a pitch amount obtained by multiplying the wire diameter by a coefficient T (0 <T <1).

[0004]

[Problems to be solved by the device]

 By the way, if such a die shape is machined by a wire electric discharge machine, the weight of the die will cause the die to be in an unstable state near the end point P1, which may affect the machining accuracy. Also, since the punching die is large, it may not come off properly at the processing end point and may affect the processing. Therefore, in the vicinity of the end point of processing, it was necessary for the worker to prevent it by supporting or pulling out the die with his or her own hands. Even in the processing method of leaving uncut and running, the cutting operator must support the cutting die at the time of subsequent shape cutting processing. In addition, by enlarging, the cutting die becomes a cutting waste, and the cutting die disappears, so it is possible to reduce the labor of the operator as described above, but with enlarging processing, if the shape becomes large, it takes a huge amount of time to process. However, there is a problem that the work efficiency is reduced and a large amount of cut dust is generated, which causes dust to be accumulated in the filter, resulting in clogging.

This invention was made in order to solve the labor of the operator as described above, and the accuracy of the work is not deteriorated due to the weight of the cutting die in the vicinity of the processing end point of the processing shape, and the cutting die is hydraulically operated. The purpose of the present invention is to obtain an NC data creation device for wire electric discharge machining that allows an operator to perform machining without supporting or drawing the die by dividing the die shape into multiple pieces and cutting them to the extent that they fall out. To do.

[0006]

[Means for Solving the Problems]

 The NC data creation device according to the present invention is relatively large in a CAD system that creates a drawing of a mold and a mold CAD / CAM system that includes an NC data creation system that creates NC data for mold processing. When creating a punching die shape (die shape), the cutting dust is divided to the extent that it falls off by water pressure, and NC data for each shape is created, enabling unmanned machining of the wire electric discharge machine. is there.

[0007]

[Action]

 The punching die shape dividing method in this invention is to automatically create NC data by dividing it into several cores based on the final processed shape and cutting each one.

[0008]

【Example】

 Example 1. FIG. 1 is a block diagram of a CAD / CAM system for mold design to which the present invention can be applied. 11a is a processor, 11b is a ROM, 11c is a RAM, 12 is a graphic display device, 13 is a tablet device, 14a is a keyboard, 14b is an XY plotter, and 15 is various data files for die design and are automatically created. It is a mass storage device that stores NC information and the like. The CRT has a display screen, and the DF has a blank shape, that is, a die shape. A menu table 13b is pasted on the tablet surface 13a of the tablet device 13, and various items and data are input by picking predetermined items written in the menu table with the mouse (stylus pen) 13c. You can do it. After designing the figure DF on the graphic screen CRT using the mouse (stylus pen) 13c and the keyboard 14a, a command for defining the die shape DF starting from the initial hole P0 and creating NC data is given. By picking with the mouse (stylus pen) 13c, an NC tape along the outer periphery of the shape DF is automatically created.

Next, the operation of the claims will be described with reference to FIGS. FIG. 2 is a diagram showing how the die shape is divided. FIG. 3 shows the overall flow chart.

In FIG. 2, the cutting die shape DF is divided into three stages for processing. First, in FIG. 2a, a shape DF1 surrounded by two straight lines obtained by dividing the shape DF into three in the vertical direction and the shape DF is obtained. NC data L1 for processing the shape as P0 as an initial hole is created. Next, in FIG. 2B, the shape DF2 surrounded by two straight lines obtained by dividing the shape DF into three in the horizontal direction and the shape DF is obtained. NC data L2 for processing the shape with P0 as an initial hole is created. Here, when the shape DF2 is processed, the shape DF1 has already been cut off. Therefore, the two pieces DF21 and DF22 are actually cut off. Finally, in FIG. 2c, NC data L3 for machining the entire circumference of the shape DF is created. What is cut off here is the last four pieces at the four corners. In this way, by processing the shape in three steps, the core can be made smaller.

FIG. 3 shows a flowchart of the above-mentioned general processing. It is assumed that a figure for creating NC data is drawn by the CAD system 1a. First, in S1, initial settings such as conditions for performing processing are performed. In S2, the figure on the screen to be processed is picked with the mouse 13c. Then, the function name "NC data creation" for automatically creating NC data is picked from the menu 13b with the mouse 13c. At S3, the storage locations L1 and L2 for storing the individual NC data of the divided figures are set to the color state. Then, in S4, it is determined whether or not the division processing of the NC data creation figure to be performed is to be performed. If the division processing is performed, the processing proceeds to S5, and if the division processing is not performed, the processing proceeds to S7. In S5, NC data of the figure created in FIG. 2a is automatically created and stored in L1. In S6, NC data of the figure created in FIG. 2B is automatically created and stored in L2. Then, in S7, NC data for performing the entire circumference machining of the figure for finally creating the NC data this time is automatically created and stored in L3. In S8, the overlapped NC data created above is stored in L, and NC data for automatically performing division processing is created by this. Finally, in S9, the created NC data is output to a floppy disk or hard disk.

Example 2. Although the first embodiment is a case where there are three divisions, the number of divisions is N and any number of divisions can be applied. Further, as a division method, divisions as shown in FIGS. 4 to 6 can be considered. In FIG. 4, the radiation is cut out, one of them is processed first (1-2-3-4), and finally the entire circumference is processed (5). In Fig. 5, the final figure is divided into several stages and the offset is processed in order from the inside. This is a method in which the pitch amount P of the enlargement processing is large. The processing order is 1-2-3. -4. Fig. 6 shows the process of dividing a large workpiece into a grid shape and skipping one by one from the inside. The processing order is 1-2-3-4-5, the second square-shaped full circumference processing 6 is performed, then 7 to 14 are processed, and the third square-shaped full circumference processing 15 is performed. Similarly, after processing up to 16 to 20, the entire circumference processing 21 of the final shape is performed. In addition, the shape is not limited to a square shape, and the division method can be applied to any shape.

[0013]

[Effect of the device]

 As described above, according to the present invention, when a relatively large die shape (die shape) is created, it is divided into a plurality of pieces until the shape falls off due to water pressure, and NC data is created. Since it is possible for a person to perform processing without supporting or removing the cutting die, unmanned processing is possible.

[Brief description of drawings]

FIG. 1 is a block diagram of a CAD / CAM system for mold design according to the present invention.

FIG. 2 is a diagram showing how the cutting die shape is divided according to the present invention.

FIG. 3 shows an overall flow chart of the division processing according to the present invention.

FIG. 4 is a diagram showing a method of radiation division according to the present invention.

FIG. 5 is a diagram showing an offset division method according to the present invention.

FIG. 6 is a diagram showing a grid-shaped division method according to the present invention.

FIG. 7 is a diagram showing a conventional die CAD / CAM system.

FIG. 8 is a diagram showing a conventional omnidirectional machining.

FIG. 9 is a diagram showing a conventional uncut uncut and escape all-round machining.

FIG. 10 is a diagram showing a conventional enlargement process.

[Explanation of symbols]

 1 Mold CAD / CAM system 1a CAD system 1b CAM system DF1, DF2, DF Split die shapes

Claims (1)

[Claims for utility model registration] [Claim 1] Mold C with NC data creation system
In a cutting die shape (die shape) device in an AD / CAM system, a wire having cutting die shape dividing means, NC data creating means for each of the divided shapes, and NC data combining means for each shape Numerical control data generator for electrical discharge machining.