JPS5894927A - Method of wire-cutting electric discharge machining - Google Patents

Abstract

PURPOSE:To efficiently draw wire-cutting electric discharge lines in each process for manufacturing a plurality of parts of the same form, by moving the processing locus reversely to jointly use a single processing line for adjacent parts. CONSTITUTION:A wire electrode 4 is moved in an electric discharge locus 3 from a starting hole 8 to a point (a) as shown by arrows. After the electrode 4 is moved from the point (a) to another (b), the electrode is moved back to the point (a) and then moved to a point (d) through a point (c). The electrode 4 is thereafter displaced back from the point (d) to the preceding one (c) and moved therefrom to a point (e). The electrode 4 is then moved from the point (e) to a point (f) and backed to the point (e). The electrode 4 is thereafter moved from the point (e) to a point (h) through a point (g). Backing in the electric discharge locus is thus effected at the beginning and end of processing of parts 2. Electric discharge machining is caused to leave small uncut portions 10. The wire electrode 4 is finally returned to the starting point 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire-cut electric discharge machining method, and in particular to a wire-cut electric discharge machining method suitable for manufacturing a plurality of machined parts of the same shape from one base material. It is.

Conventionally, there are the following processing methods of this type, which will be explained using FIG. 2.

In the figure, (1) is the base material, (2) is the machined part manufactured from this base material (1) by electric discharge machining, and (3) is the process of electrical discharge machining of the machined part (2) with the wire electrode (4). , (5) is the cutting trajectory for separating the machined part (2) from the base material (1) by electric discharge machining using the wire electrode (41), and (6) is the machinable range of the wire-cut electric discharge machine. line, (71 is the connection part that connects the processed part (2) with the base material (1), (8) is the machining start hole in the base material (1), (91 is the base material located outside the machinable range) This is the attachment part for the material 11) and is attached to the main body of the electrical discharge machine.

Next, a processing procedure using a conventional method will be explained. First, the mounting part 19+ located outside the machining range (6) of the two machines in the rectangular base material (1), which has been drilled with a carnivorous start hole (8) and subjected to the necessary heat treatment, is machined using an electrical discharge machining machine. Attach to the main body. Next, pass the wire electrode (4) through the crab start hole 18+, and connect the wire electrode (4) and base material (11) to N.
o Tape allows for relative movement under automatic control. As a result, the wire electrode (4) moves along the machining trajectory (3) from the carving start hole (8) in the direction of the arrow and returns to the carving start hole (8) again. A plurality of these processed parts (2) are manufactured in a state where they are connected to the base material (1) at a connecting part (71), and the first step is completed.

Subsequently, the second step is completed by moving the wire electrode (4) along the cutting locus (5), which is a chain point in the direction of the arrow, and separating the processed part (2) from the base material.

Roughly speaking, the processed parts (connection part 7 of 21) shown in FIG.
1 is removed using a cutting wheel and further finished to produce a product as shown in FIG.

Although machining is performed by hand and hand as described above, wire cut electrical discharge machining requires two steps in such conventional machining methods. That is, although the first step is continuous processing, the processing that is not directly related to the processed parts becomes long, which not only wastes energy but also reduces the yield of the base material. Also, the second
The problem with this process is that the wire electrode starts discharging from the end face of the base material, and the wire electrode is likely to break, and the wire is also likely to break when the processed parts are separated. Furthermore, even if the machined part is machined without breaking, the machined part will fall onto one of the electrical discharge machines, and if it is not removed, the machine will not be able to operate normally.
It was not suitable for continuous machining work that requires overnight operation. This invention method was developed to eliminate the above-mentioned drawbacks, and it eliminates waste while maintaining stable machining conditions in one machining process. The purpose of this method is to provide a machining method that can easily be operated all night without requiring monitoring work.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is for explaining an embodiment of the method of this invention, and FIG.

(1) is the base material, (21 is the machined part manufactured from this base material (1) by electrical discharge machining, (3) is the machining trajectory when the machined part (21 is electrically discharge machined with the wire electrode (4), 6
) is a line indicating the machinable range of the wire-cut electrical discharge machine, 181 is the start hole of base material 11), +9) is the attachment part of base material (1) located outside the machinable range, an is continuous It is a bellybutton for processing. Fig. 5 shows a partially enlarged view of the machining trajectory (31) by the wire electrode (4) in order to make it clearer.

a, b, c, d, e, f, g, h are points at which reverse trajectory retreat is performed.

dl indicates the processed groove after the wire electrode (4) has passed.

Next, a processing procedure using the method of this embodiment will be explained. First, in the rectangular base material (1) in which a carnivorous start hole (8) has been drilled and the necessary heat treatment has been performed, the mounting part (91) located outside the machining range (6) of the 9 machine is electrically discharge-machined. Attach it to the machine body.Next, pass the wire electrode (4) through the knife start hole (8), and connect the wire electrode 14+ and the base material (1) to N.
Processing is performed while relatively moving using O-tape under automatic control. As a result, the wire electrode (4) moves along the machining trajectory (
3) from the crab start hole (8) in the direction of the arrow to point a. The wire electrode (4) changes direction from point a and moves to point b
After moving to point A, the vehicle moves back on the driving trajectory (returns to the same trajectory) again to point a, and then passes through point C and moves to point d. Subsequently, the wire electrode (4) performs a reverse trajectory retreat from point d to point 0, changes direction from point 0, and moves to point e.

At point 0, change direction again and move to point f, reverse the trajectory and return to point e, pass point 1g, and move to point h. In this way, reverse trajectory retraction is used at the machining start point and machining end point of the machined part (21), and repeated electrical discharge machining is performed while leaving an extremely small umbilicus as shown in Fig. 6, and then the machining start point ( Return to 8) to complete the process.After that,
A blow is applied to the processed part (2), and the processed part (2) is separated from the base material 11) at the navel part.

Make it something like Figure 6. Finally, the belly button Q[I part is polished to a finished product as shown in Figure 2.

As described above, according to the two methods of the present invention, the machined parts are positioned alternately across the machined grooves, and the wire electrode is retreated on a reverse trajectory, so that the machined lines that are not directly related to the machined parts, which were conventionally required, are removed. Almost no longer needed. In addition, by providing a common machining line with adjacent machined parts, the machining time is shortened, and the yield of the base material is also significantly improved.

In addition, since processing is performed with one IS drawing, continuous processing can be easily performed by overnight operation without the need for monitoring work. Furthermore, the curvature portion is approximately the same size as that generated during normal wire cutting processing, or is smaller than that, making removal processing easier.

[Brief explanation of drawings]

Fig. 1 is a diagram of the product shape, Fig. 2 is a diagram for explaining the conventional processing method, Fig. 3 is a diagram of the machined part cut from the base material by the conventional processing method, and Fig. 4 is a diagram of the product according to the present invention. FIG. 5 is a partially enlarged view of a machining trajectory according to the present invention, and FIG. 6 is a diagram of a machined part cut from a base material by impact. (1)... Base material, (21... Processed parts, (3)...
・Processing trajectory, C41...Wire electrode, (5)...Cutting trajectory, (6;...Processable range, (7)...Connection part, (8)...Cut start hole, 19)...Mounting part, (IQ...navel, Qto...English letters a+')+Co (L e+L gt hw in Fig. 5) indicate the reverse locus retreat point. Fig. 2 Inside, the same reference numerals indicate the same or equivalent parts. Agent Shin Kuzuno - No. 28!1I = 12' li4 Figure

Claims (1)

[Claims] In the wire-cut electrical discharge machining method that manufactures multiple machined parts from one base material, the machining start point and machining end point of the machined part are close to each other with an extremely small gap, and the machining trajectory of only the above-mentioned machined parts is reversed. The method is characterized in that the base material and the wire electrode are relatively moved so as to have a common machining line with adjacent workpieces, and the base material is continuously worked with one stroke to form a plurality of workpieces. Wire cut electrical discharge machining method.