JPH0641783Y2 - Electric discharge machine - Google Patents

Description

[Detailed description of the device] [Industrial applications]

TECHNICAL FIELD The present invention relates to an electron conduction for contacting an extremely thin and flexible electrode such as a thin wire or pipe electrode in electric discharge machining.

[Prior art]

In electric discharge machining, an electric current is applied to an electrode and a work to generate an electric discharge in a gap between the two, and the electric discharge energy is used to perform machining of the work. Then, an electric wire from a power source is directly connected to energize the workpiece through an energizing electron and a workpiece is energized. FIG. 5 shows an outline of electric discharge machining using conduction of a conventional electric discharge machine, taking as an example a case where a pipe-shaped electrode is used to make a fine hole in a workpiece. In FIG. 5, 2 is a pipe electrode, 5 is a workpiece, 5-1 is a machined fine hole, 6 is a power source,
Reference numeral 20 is a conducting electron, 21 is a spring, and 22 is a pipe-shaped electrode holder. The pipe-shaped electrode 2 is energized from the power source 6 through the conduction electron 20, and in order to improve the conduction, the conduction electron 20 is pressed against the pipe-shaped electrode holder 22 by the spring 21. On the other hand, the work 5 is directly energized by the power supply 6. A pipe-shaped electrode through which the working liquid can flow is used as an electrode when the fine hole 5-1 is formed in the workpiece 5. The machining liquid is ejected from the tip of the pipe-shaped electrode 2 and is supplied to the discharging portion (that is, inside the fine hole 5-1). As the processing progresses and the fine hole 5-1 becomes deeper, the pipe-shaped electrode 2 is fed deeper.

[Problems that the device is trying to solve]

(Problem) In the above-described conventional technique, the pipe-shaped electrode holder 22 separated from the processed portion, the ram (not shown) that holds the pipe-shaped electrode holder 22, and the spindle that rotates if the electrode is rotated. There is no choice but to contact the electronic device to etc. However, since electricity is applied from the upper part of the thin electrode, the length to the work piece is long and the resistance is large, so that the electrode softens due to heat generation or vaporization of the working fluid flowing through the electrode. Therefore, there is a problem that processing performance and processing accuracy are deteriorated. (Explanation of Problems) Some pipe-shaped electrodes used for making a small hole in a workpiece have a diameter of 1 mm or less. Such an electrode has low rigidity. In order to directly energize the tip end portion of this, it is necessary to press it by a spring so that the conduction current surely contacts. However, in that case, the pipe-shaped electrode is bent and the processing accuracy deteriorates. If the force of the spring is weakened in order to prevent it from bending, the contact between the pipe-shaped electrode and the conduction electron becomes poor and the energized state deteriorates. The finer the pipe-shaped electrode, the finer the adjustment of the contact pressure, but with the conventional technology that uses a spring to generate the contact pressure, it is difficult to properly manufacture the spring because of the structure that the spring is installed in a narrow space. It has been difficult and it has been extremely difficult to properly adjust the contact pressure. However, since the processing itself is not performed in the first place unless the electricity is secured, the spring force tends to be strengthened, and as a result, the pipe-shaped electrode often bends. The present invention aims to solve the above problems.

[Means for solving problems]

In order to solve the above-mentioned problems, the conduction of the electric discharge machine according to the present invention includes a corner portion, and is tilted by its own weight when supported by the corner portion, and the tilting force is used to contact the electrode. I decided.

[Action]

If the corner is used as a fulcrum, the conducting electron is inclined by its own weight. When tilted toward the electrode, the contact pressure on the electrode corresponds to the self-weight of the conduction electrons. Therefore, the contact pressure can be adjusted by cutting the conduction and adjusting the own weight. Since the weight can be adjusted extremely finely, it is possible to finely adjust the contact pressure compared to the conventional one that uses a spring or the like.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an outline of electric discharge machining using a conduction of the electric discharge machine according to the present invention. In FIG. 1, reference numeral 1 is a conduction electron. The other reference numerals correspond to those in FIG. The conducting electrons 1 are inclined by their own weight, and are arranged so as to lean on the pipe-shaped electrode 2 while inclining. The force when leaning is the contact pressure. That is, the conducting electron 1 does not obtain the contact pressure to the pipe-shaped electrode by the force from the outside such as the spring, but obtains the contact pressure by utilizing its own weight. FIG. 2 shows the details of the portion of the electric discharge machine according to the present invention, in which the electrical conduction is arranged. In FIG. 2, the same reference numerals as those in FIG. 1 correspond to those in FIG. And 3
Is an electrode guide, 4 is a lead wire, 7 is an electric wire, 8 is a base, and 9
Is a guide holder, and 10 is a terminal. The pipe-shaped electrode 2 is guided by the electrode guide 3, and the narrow hole 5-
When 1 becomes deeper, it is sent downward. The electrode guide 3 is
It is supported by the substrate 8 at a position near the surface of the workpiece 5. The conducting electrons 1 are arranged inside the electrode guide 3. The reason for arranging here is as follows. When the position of the current-carrying electron 1 in contact with the pipe-shaped electrode 2 is further raised, the length from the contact position to the discharge part (that is, the tip of the pipe-shaped electrode 2 that has entered the narrow hole 5-1) is increased. It becomes longer and the electric resistance becomes larger. Then, the power consumption becomes large. In addition, the heat of the electrodes and the evaporation of the working liquid occur at the same time. In order to reduce power consumption, it is desirable to make contact at a position as close as possible to the discharge part. Therefore, it is arranged on the electrode guide 3. The conducting electrons 1 lean and lean against the pipe-shaped electrode 2 due to their own weight. The contact pressure to the pipe-shaped electrode 2 depends on its own weight. Therefore, if the self-weight is small, a small contact pressure suitable for a thin and low-rigidity electrode such as the pipe-shaped electrode 2 can be obtained. In addition, the contact pressure can be adjusted by slightly cutting the conduction electron 1 to adjust its own weight.
According to this, fine adjustment is possible. The power supply to the electronic device 1 is performed by a power source not shown in FIG.
The process is performed through the electric wire 7, the terminal 10, and the lead wire 4. Electric wire 7
Are wired through the hollow portion of the guide holder 9. FIG. 3 is an enlarged view of the electric current of the electric discharge machine according to the present invention. FIG. 3 (A) is a side view and FIG. 3 (B) is a plan view. The conduction electron 1 has a shape inclined by its own weight (how to make such a shape will be described in FIG. 4). The conduction electron 1 has a corner 1-1, and the corner 1-1 is locked to the corner of the inner wall of the electrode guide 3. The conduction electrons 1 contact the pipe-shaped electrode 2 at the portion of the V groove A-1. FIG. 4 shows a method of manufacturing a conduction electron of an electric discharge machine according to the present invention. A is a conductive disk which is a material for conducting electrons, FIG. 4 (a) is a view seen from the thickness direction, and FIG. 4 (b) is a view seen from a plane direction. The conductive disk A is provided with a V groove A-1 on its peripheral side. The V groove A-1 is for ensuring contact with the pipe-shaped electrode 2. Then, cutting is performed along the line L to obtain the conduction electron 1. Line L
The cut-out commutation electron 1 includes a corner 1-1, and the corner 1
Any shape may be used as long as it supports the communication electron 1 with -1 as a fulcrum and is inclined by its own weight. Therefore, the line L to be cut does not have to have two sides as shown in FIG. Although a conductive disk is shown in FIG. 4, it may be an elliptical plate or a parabola.

[Effect of device]

As described above, the electric discharge machine of the electric discharge machine according to the present invention includes the corner portion, and is tilted by its own weight when supported by the corner portion, and the electrodes are brought into contact by utilizing the tilting force. Therefore, the following effects are achieved. Contact pressure can now be obtained without borrowing external force such as a spring. If the weight of the conduction electrons is reduced, a small contact pressure can be obtained. In addition, the contact pressure can be finely adjusted by adjusting the own weight.

[Brief description of drawings]

FIG. 1 ... Schematic diagram of electric discharge machining using the electric current of the electric discharge machine according to the present invention FIG. 2 ... Detailed view of a portion of the electric discharge machine according to the present invention where the electric current is arranged FIG. Enlarged view of the electric discharge of the electric discharge machine according to the invention Fig. 4 ... Diagram showing how to manufacture the electric discharge of the electric discharge machine according to the present invention Fig. 5 ... Electric discharge machining using the electric discharge of the conventional electric discharge machine In the figure, 1 is an electron, 2 is a pipe-shaped electrode, 3 is an electrode guide, 4 is a lead wire, 5 is a workpiece, 5-1 is a small hole, 6
Is a power source, 7 is an electric wire, 8 is a base, 9 is a guide holder, 10
Is a terminal, 20 is a conducting wire, 21 is a spring, A is a conductive disk,
A-1 is a V groove.

Claims (1)

[Scope of utility model registration request] 1. An electric discharge machine of an electric discharge machine, comprising: a corner portion, which has a shape inclined by its own weight when supported by the corner portion, and contacts the electrode by utilizing a tilting force.