JPS6284920A - Electric discharge machining electrode - Google Patents

Abstract

PURPOSE:To permit an electrode to perform glossy machining of large area, by constituting the electrode main unit focusing plural column-shaped conductive members to be mutually insulated while exchangeably connecting a high resistance plate-shaped member with one end of the electrode main unit and uniformly feeding electric power. CONSTITUTION:An electrode main unit 2 constitutes column-shaped conductive members 1, focused and mutually insulated, respectively into an independent discharge circuit to be brought into contact with a high resistance plate-shaped member 3, consisting of ceramic material or the like through each leaf spring 11, and electric power is supplied uniformly to the whole surface from a power fed means 4 through plural leaf springs 41. Accordingly, the individual discharge circuit 1, generating sufficiently small discharge energy in each time, enables glossy machining to be realized by preventing a generated crater from becoming large. While if the high resistance plate-shaped member 3 is replaced with a low resistance plate-shaped member consisting of copper or the like rough machining can be performed by a large electric current. In this way, the machining can be performed being easily switched to the glossy machining or rough machining.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electrode for electric discharge machining suitable for large-area gloss machining (finish machining). In addition, for rough machining and gloss machining (
The present invention relates to an electrode for electric discharge machining that can be used for both finishing and finishing machining.

[Conventional technology]

In electric discharge machining, rough machining is first performed, and then gloss machining (finish machining) is often performed.

To perform polishing (finishing), the capacitance included in one circuit, such as the stray capacitance and the capacitance of the electrode for electrical discharge machining, should be minimized as much as possible, and with a small machining current, the ON width and OFF width should be 1 to 3 μs. It is known in the prior art that it is effective to perform rocking machining with the Here, the reason why it is required to reduce the capacitance of the circuit is to reduce the amount of energy released in each discharge,
This is to reduce the depth of the crater.

[Problem that the invention seeks to solve]

In order to reduce the capacitance of electrodes for electrical discharge machining, the following methods have been conventionally used.

(b) The first method is to add a series resistor to a columnar conductive member with a cross-sectional area of approximately 900m+o (a rectangular cross-section with a side length of 30mm), and use a plurality of resistors converged. .

(b) The second method uses a ceramic plate with high resistance and weak conductivity as an electrode, and the energy stored between the electrode and the workpiece is passed through the ceramic electrode to generate a current. During flow, the resistance of this ceramic body is reduced, eliminating the need for electrode splitting.

However, these two methods each have the following problems.

In (a), if you try to process a large area using this method, you will need a large number of series connections of columnar conductive members and series resistors.For example, if the cross-sectional area is 900 cm2 ( In the case of a rectangular shape with a side length of 30 cm), this would require 100 series connections of columnar members and series resistors, which is unrealistic.

In (b), it is inherently difficult to manufacture a ceramic body of arbitrary shape, and it is also difficult to carry out rough machining using this electric discharge machining electrode. When the large current required during rough machining is applied, the temperature of the ceramic body rises significantly.In addition, in this method, electric discharge for electric discharge machining is generated on the surface of the ceramic body, so this electric discharge causes the ceramic body to This is because the electric discharge machining electrode itself, which is made up of a body, will wear out, and the life of the electric discharge machining electrode will be shortened.

In short, in the prior art, the electric discharge machining electrodes used for gloss machining all have drawbacks, and it has been desired to develop a more suitable electric discharge machining electrode for gloss machining.

An object of the present invention is to meet this demand and provide an electrode for electrical discharge machining suitable for large-area gloss machining. Another object of the present invention is to provide an electrode for electrical discharge machining that can be used for rough machining and gloss machining.

[Means for solving problems]

The means taken by the present invention to achieve the above first object is that a plurality of columnar conductive members 1 are insulated from each other and converged to form an electrode body 2, and a high-resistance plate-shaped A member is connected to each of the plurality of columnar electrically conductive members 1 so as to be replaceable, and a power supply means 4 is provided to uniformly supply power to the entire surface of the high resistance plate member 3, thereby forming an electrode for electrical discharge machining. be.

In addition, the means taken by the present invention to achieve the second object is that a plurality of columnar conductive members 1 are insulated from each other and converged to form an electrode body 2, and one end of this electrode body 2 is provided with a low resistance A plate-like member 5 is connected to each of the plurality of columnar conductive members 1 so as to be replaceable, and a power supply means 4 for uniformly feeding power to the entire surface of the low-resistance plate-like member 3 is provided to serve as an electrode for electrical discharge machining. It is something.

The two electrodes for electrical discharge machining are mutually convertible.

[Effect]

The present invention is an improvement of the electrical discharge machining electrode (a) according to the above-mentioned prior art, in which the electrode body is made up of a plurality of columnar members that are insulated and focused together, and a single high-resistance member is used as the above-mentioned electrode. It is connected to the electrode body, and the multiple series resistors required in the prior art are replaced with a single high-resistance member.

Further, by replacing this single high resistance member with a single low resistance member, it is possible to easily switch to rough machining.

〔Example〕

Hereinafter, electric discharge machining electrodes according to two embodiments of the invention included in the present application will be further described with reference to the drawings.

Example of the First Invention Reference numeral 1 in FIG. 1 is a columnar member made of a low-resistance material such as copper or brass, and its cross section is a square with one side of about 3 hm. This columnar member 1
are mutually insulated and focused to form the electrode body 2. One end of each columnar member (upper end in the figure) has a leaf spring, etc.
1 is provided to make good contact with the high resistance plate member 3.

The high resistance plate member 3 is a plate member made of ceramic material or the like,
The specific resistance is selected to be relatively large.

The shape is simply a flat plate, and manufacturing is extremely easy.

Reference numeral 4 denotes a power supply means for uniformly supplying power to the entire surface of the high resistance plate-like member 3, and a leaf spring etc.
is provided to improve contact with the high-resistance plate member 3. In this example, the power supply means 4 also has the function of focusing and tightening the columnar conductive member 1, and includes a focusing band 42 that focuses the columnar conductive member 1, and a port 43 and a nand 44 that tighten the band to the power supply means 4. . Power is supplied via terminal 45.

The main body 2 of the electrical discharge machining electrode has the following structure:
The columnar conductive members l, which are mutually insulated and focused, each constitute an independent discharge circuit, and the electrode body 2 is connected to a high-resistance plate member 3, and each discharge circuit includes a high-resistance plate member 3. Since it has resistance, the discharge energy each time is sufficiently small, the crater does not become large, and an excellent gloss finish can be achieved.

Second Example of the Invention See FIG. 2 This is generally the same as the first example, but the high resistance plate member 3 is
It has been replaced with a low-resistance plate-like member 5 made of a low-resistance material such as copper or brass.

The electrode main body 2 of the electrical discharge machining electrode of this structure has columnar conductive members 1 which are mutually insulated and focused.
However, since it is connected in series with the low-resistance plate member 5, it functions as if it were a single electrode body. Further, since the resistance of the electrical discharge machining electrode as a whole is small, a large current can be passed through the electrode, and it functions as an excellent electrical discharge machining electrode for rough machining.

The example of the first invention and the example of the second invention can be easily mutually changed by exchanging the high resistance plate member 3 and the low resistance plate member 5, and can be used for gloss processing (finish processing). It can be easily switched between (for general use) and for rough machining.

〔Effect of the invention〕

As explained above, the electrode for electric discharge machining according to the present invention is
an electrode body in which a plurality of columnar conductive members are insulated from each other and bundled; a high-resistance plate-like member connected to each of the plurality of columnar conductive members and replaceably provided at one end of the electrode body; An electric discharge machining electrode includes a power supply means for uniformly supplying power to the entire surface of this high-resistance plate-like member, an electrode body in which a plurality of columnar conductive members are mutually insulated and focused, and a A discharge force consisting of a low-resistance plate-like member that is replaceably connected to each of the plurality of columnar conductive members, and a power supply means that supplies power uniformly to the entire surface of this high-resistance plate-like member. In the former case, each columnar conductive member functions as an independent discharge circuit with high resistance, and the action of this high resistance limits the discharge energy of each time, making it an excellent electrode for electrical discharge machining for gloss machining. Function. In addition, in the latter case, the above-mentioned high-resistance plate-like member is replaced with a low-resistance plate-like member, so the plurality of columnar conductive members function as an integrated electrode, making it an excellent electrode for electrical discharge machining for rough machining. functions as And these two can be switched between each other very easily.

[Brief explanation of drawings]

FIG. 1 is a structural diagram of an embodiment of the first invention. FIG. 2 is a structural diagram of an embodiment of the second invention. 1... Column conductive member, 11φ... Leaf spring, etc., 2 Cloudy...
- Electrode body, 3... High resistance plate member, 4... Power supply means, 41... Leaf spring etc., 4211... Focusing band, 43-... Bolt, 44... Nut, 4500
．． Terminal, 50.・Low resistance plate member.

Claims (1)

[Scope of Claims] [1] An electrode body (2) formed by a plurality of columnar conductive members (1) insulated and bundled together; 1
), and a power supply means (4) that uniformly supplies power to the entire surface of the high-resistance plate-like member (3). electrode. [2] An electrode body (2) in which a plurality of columnar conductive members (1) are insulated and bundled together;
), and a power supply means (4) that uniformly supplies power to the entire surface of the low resistance plate member (5). electrode.