JPS6237618Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Technical field of the invention The present invention relates to an improvement of a wire guide for wire cut electrical discharge machining. In particular, it relates to improvements in die-type wire guides.

(2) Background of the technology A wire-cut electric discharge machine is a machine that generates intermittent electrical discharge in the machining fluid that is injected into the gap between the workpiece and a machining wire electrode that extends linearly through the workpiece. This intermittent electrical discharge hardens or melts the machined area of the workpiece extremely locally, and generates intermittent changes in pressure locally near the machined area. A metal processing machine that peels off and removes the workpiece in the locally hardened and melted area as a result of changes,
Normally, a numerically controlled servo system or the like is used to accurately guide the above-mentioned machining wire electrode along the desired machining surface, so (i) machining accuracy is extremely good, and (ii) arbitrary irregular shapes can be avoided. (iii) machining can be performed regardless of the hardness of the material that makes up the workpiece.

By the way, the machining accuracy of the wire cut electrical discharge machining method depends on the accuracy of the position of the machining surface formed by the machining wire electrode and the workpiece facing each other, so the function of the wire guide is to improve the machining accuracy. ,
extremely important.

Conventionally, wire guides for wire cut electrical discharge machining include inclined V-groove guides, die-type guides,
Three types of three-point support type guides are mainly used, but the present invention is an improvement on the die type guide.

(3) Prior Art and Problems The conceptual structure of a die-type guide in the prior art is shown in Figure 1. In the figure, 1 is a wire electrode for processing, and 2 is a die, which is manufactured from extremely hard material such as diamond. 4 is a die support member which is driven by a numerically controlled servo system or the like. By the way, in so-called taper machining, where the angle between the machining surface and the bottom surface of the workpiece is not 90°, the contact point between the wire electrode 1 and the die 2 is almost a point, as shown in FIG. The wire electrode 1 is bent suddenly at the point of point contact, and the wire electrode is likely to vibrate while the wire electrode is being fed, resulting in the disadvantage that streak-like traces are likely to be formed on the machined surface of the workpiece. be.

This drawback can be avoided by using a funnel-shaped die 3 as shown in FIG.
As is clear from comparing Figures 2 and 3,
It is necessary to increase the volume of the dice 3. Therefore, manufacturing such large dies using expensive materials such as diamonds will result in a cost disadvantage, so it is common to use relatively inexpensive materials such as sapphire, and such materials are expensive. Since the hardness is low, there is a disadvantage that the life of the die and furthermore of the wire guide is shortened.

(4) Purpose of the invention The first purpose of the invention is to eliminate this drawback; the cylindrical die type guide is suitable for non-taper machining, but is not suitable for taper machining; Die guides are suitable for taper machining, but when used for non-taper machining, they have shortcomings such as shortened service life, and funnel-shaped die guides are not necessarily suitable for non-taper machining. A wire guide for wire cut electrical discharge machining that can be used for both taper and non-taper machining without any disadvantages. Our goal is to provide the following.

The second purpose of the present invention is, in addition to the above benefits, to
An object of the present invention is to provide a wire guide for wire cut electrical discharge machining with a long life.

(5) Structure of the invention The structure of the invention consists of a cylindrical die-shaped guide (hereinafter referred to as the first
A funnel-shaped die-shaped guide (hereinafter referred to as a second die-shaped guide) 2, a funnel-shaped die-shaped guide (hereinafter referred to as a second die-shaped guide) 3 whose surface is made of sapphire and has a smoothly curved surface, and a support member 5 are combined into a funnel-shaped die. This is a wire guide for wire cut electric discharge machining in which a die guide 3 is arranged closer to the machining area than a cylindrical die guide 2.

The present invention provides a wire cut electrical discharge machining method that includes:
Focusing on the fact that the frequency of so-called taper machining is not necessarily high, a first die-type guide suitable for vertical machining and a second die-type guide suitable for so-called taper machining are provided one on top of the other. A first die-type guide made of a material with high hardness is used to prevent disadvantages in terms of service life, and a second die-type guide that has no disadvantages in maintaining machining accuracy is used during so-called taper machining. The aim is to improve machining accuracy, compensate for the shortcomings of both, and utilize only the advantages.

In summary, the function of the present invention is to provide a first die-shaped guide (a cylindrical guide made of diamond) suitable for non-taper machining, and a second die-shaped guide (made of sapphire with a smoothly curved surface) suitable for taper machining. As the wire direction changes between non-taper machining and tapered machining, the funnel-shaped guide (which is said to be a funnel-shaped guide) is arranged so that it is automatically switched between uses.As a result, a separate switching mechanism is required. It is possible to automatically switch between a cylindrical guide made of diamond and a funnel-shaped guide made of sapphire with a smoothly curved surface without the need for a guide.

Therefore, it is effective to make the inner diameter of the second die-shaped guide larger than the inner diameter of the first die-shaped guide, since this enhances the above-mentioned effect.

(6) Embodiment of the invention Hereinafter, with reference to FIG. 4, a wire guide for wire cut electric discharge machining according to an embodiment of the invention will be explained, and its structure and unique effects will be clarified.

In the figure, 1 is a processing wire electrode, 2
is the first die-shaped guide, which is made of extremely hard material such as diamond, and the inner diameter is somewhat funnel-shaped toward the top in the figure to facilitate the passage of the wire electrode 1; On the other hand, the inner diameter is completely uniform. That is, the shape is suitable for vertical machining, but not suitable for so-called taper machining. 3 is the second die-shaped guide, which is made of a material such as sapphire that has high hardness but is somewhat inexpensive, and its inner diameter increases downward in the figure to form a funnel-shaped shape, making it suitable for so-called taper processing. It is said to have a suitable shape.
Note that the inner diameter of the first die-shaped guide 2 is somewhat smaller than the inner diameter of the second die-shaped guide 3. 5 indicates first and second die-shaped guides 2 and 3;
The die type guide is driven by a numerically controlled servo system or the like through this support member.

During vertical machining, which is frequently performed, the wire electrode 1 is guided by the first die-shaped guide 2.
Since the hardness of this guide 2 is extremely high, a sufficiently long service life is achieved. During so-called taper processing, the wire electrode 1 is guided by the second die-shaped guide 3, and since this guide 3 is suitable for so-called taper processing, The electrode will not vibrate and streak-like traces will be formed on the machined surface of the workpiece, which will not impair the machining accuracy. Moreover, since the frequency of so-called taper processing is not large, there is no disadvantage in terms of service life.

(7) Effects of the invention As explained above, according to the invention, the first die-shaped guide (made of diamond) suitable for non-taper machining, and the second die-shaped guide (made of sapphire with a surface) suitable for taper machining. As a result, the funnel-shaped guide (which has a smoothly curved surface) is automatically switched between taper machining and non-taper machining, and even in so-called taper machining,
Wire-cut electrical discharge machining allows for excellent machining accuracy without forming streak-like marks on the machined surface of the workpiece due to vibration of the wire electrode, and has a sufficiently long life. can provide wire guides for

[Brief explanation of the drawing]

1, 2, and 3 are conceptual structural diagrams of a wire guide for wire cut electrical discharge machining in the prior art, and FIG. 4 is a conceptual structural diagram of a wire guide for wire cut electrical discharge machining according to an embodiment of the present invention. . 1... Wire electrode for processing, 2, 3... Dice type guide, 4, 5... Support member.

Claims (1)

[Scope of utility model registration request] Cylindrical die-shaped guide 2 made of diamond
The funnel-shaped die-shaped guide 3 is made of sapphire and has an enlarged cross section along the axis through which the wire passes in an arc shape and has no corners on the inner surface, and a supporting member 5. A wire guide for wire cut electric discharge machining, characterized in that it is arranged closer to the machining area than the cylindrical die type guide 2.