JPH11826A - Wire electric discharge machining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a projection from being formed in the working start part of a work by bringing a wire electrode into contact with a position slightly separated from the right-angled part forming a part of a working form at a prescribed angle. SOLUTION: A wire electrode E is controlled so as to start from a hole 4 and make contact with a solid line 2 showing a working form at a required angle smaller than 90 deg. in a position slightly separated from the right-angled part 7 of the solid line 2. Namely, the electrode E works a work 1 as the solid line 2 while changing the relative position with the work 1 in the order of arrows (a), (b), (c), (d), and (e). The electrode E makes contact with the solid line 2 showing the working form at an angle smaller than 90 deg. in a position separated 0.5 mm from the right-angled part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a known wire electric discharge machining method.

[0002]

2. Description of the Related Art FIGS. 2 (a), 2 (b), 3 (a),
(B) shows an example of a conventional wire electric discharge machining method, respectively. The shape of the work and the shape to be cut are the same. The material of the work is aluminum, and the wire electrode used for cutting is 0.2φ or 0.25φ.
Is brass

First, an example of FIGS. 2A and 2B will be described.
When the work 1 is processed into a rectangular shape shown by a solid line 2 in FIG. 2 to remove the core 3, first, a hole 4 having a required size is made in the work 1, and a wire electrode E is passed through the hole 4. Next, while continuously changing the relative relationship between the electrode E and the workpiece 1 in the order of arrows A, B, C, D, and E, the workpiece is processed into the shape of the solid line 2. By processing in this manner, the core 3 surrounded by the solid line 2 falls off, and a rectangular hole is formed in the work 1.

[0004] By the way, such processing is generally widely performed, but a portion where the electrode E starting from the position of the hole 4 is in contact with the solid line 2 at right angles, that is, a dotted line in FIG. As shown in FIG. 2B, small projections 5 are formed at the circles.

FIGS. 3 (a) and 3 (b) show another processing example in which the electrode E moves while making a curve from the hole 4 in the direction of the arrow, comes into contact with the solid line 2, and then makes a curve in the direction of the arrow B. The electrode moves while returning to the position of the hole 4. That is, as shown in the figure, processing is performed on a balloon-like locus, and the core 6 is cut off. After that, the electrode E moves again in the direction of arrow A and comes into contact with the solid line 2, and then continuously changes the relative relationship between the electrode E and the work 1 in the order of arrows C, D, E, F, and G as shown by the solid line 2. Process. By performing such processing, the core 3 surrounded by the solid line 2 falls off, and a rectangular hole is formed in the work 1. In addition, the processing method shown in FIG. 3 is a method which has been generally and widely performed in the past, similarly to the processing method shown in FIG.

[0006]

In the case of processing as shown in FIGS. 2 and 3, the position where the electrode and the solid line portion first come into contact with each other, that is, the portion circled by a dotted line is shown in FIGS.
A small protrusion 5 as shown in FIG. Various investigations have been made on the cause of the formation of the protrusion 5, but it is not clear at this time. However, when the processed work is used, for example, as a microwave transmission component, the reflection of the microwave by the projections 5 causes a serious problem in radio wave characteristics.

[0007]

According to the present invention, the wire electrode is processed so as to contact the wire electrode at an angle smaller than 90 ° at a position slightly away from a right angle portion which forms a part of the processed shape.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. 1 (a) and 1 (b) show an embodiment of the present invention. In the present invention, a wire electrode E starts from a hole 4 and has a solid line 2 showing a processed shape.
At a position slightly away from the right angle portion 7 of the solid lines 2 and 9
It is controlled so that it contacts at a required angle smaller than 0 °. That is, the electrode E processes the work 1 as indicated by the solid line 2 while changing the relative position with respect to the work in the order of arrows A, B, C, D, and E. FIG. 1B shows the details of the right-angled portion 7.
It comes into contact with the solid line 2 indicating the processing shape at an angle smaller than 0 °.

[0009]

According to the present invention, although the reason is not clear, the projections shown in FIGS. 2 and 3 cannot be formed, and therefore, even if the processed product is used as a microwave component, the reflection of the microwave does not occur. There is no.

The embodiment shown in FIG. 1 shows the gist of the present invention. In the case of a rectangle having four right-angled portions, the present invention can be applied to any right-angled portion. . In addition, it is needless to say that, by being limited to the shape having four right angle portions, it is possible to spread to a shape having only one right angle portion.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment according to a processing method of the present invention.

FIG. 2 is a diagram showing an example of a conventional processing method.

FIG. 3 is a view showing another example of a conventional processing method.

[Explanation of symbols]

1 Workpiece, 2 solid lines showing processing shape, 3 cores, 4
Hole, 5 right angles, E-wire electrode.

Claims (3)

[Claims] 1. A wire electric discharge machining method for machining a required portion of a workpiece into a desired shape having a right angle portion using a wire electrode. A wire electric discharge machining method, characterized in that machining is performed so as to reach the above shape. 2. The wire electric discharge machining method according to claim 1, wherein the wire electrode used is brass of 0.2φ or 0.25φ, and the material of the work is aluminum. 3. A method according to claim 1, wherein a right angle portion which forms a part of the machined shape is 0.1 mm from the right angle portion.
2. The wire electric discharge machining method according to claim 1, wherein machining of a desired shape is started from a position separated by 5 mm.