JPH01153222A - Current supply device for wire cut electrospark machining apparatus - Google Patents

Abstract

PURPOSE:To enable stable current supply by providing at least two long conductive bodies having circular outer peripheries respectively parallel to each other and contacted or spaced by fine gap from each other and a wire electrode contacted movably with a groove formed between the long conductive bodies to supply current thereto. CONSTITUTION:A wire electrode 1 and a circular conductive body 3 contact each other at least two points P1, P2 and linearly by the length of a conductive body 3. Thus, they contact each other along at least two lines so that the conductive area is increased about not less than two times than prior one and conducted current concentration is reduced to not more than one half. Also, parallel V-shaped grooves formed by the contact of parallel conductive bodies 3 with each other contact fittingly with the electrode 1 so that the electrode 1 does not get out of the groove by vibrations to produce locus change but provides stable travel ad conductive contact. Also, when a portion of conductive body 3 contacting the wire electrode 1 is worn, an annular holder 4 is pivoted by a drive roller 5, so that the circular conductive body 3 is rotated about its own axis to change the contact position. Thus, current can be supplied stably for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an energizing device for a wire-cut electrical discharge machining machine.

[Prior art and problems]

Conventionally, a cylindrical current-carrying body 2 has a circular hole 2a formed therein as shown in FIG. 1 in order to change the current-carrying position of the current-carrying bottle each time it is consumed, as a current-carrying device for applying processing pulses from a processing power source to a wire electrode. An apparatus has been proposed in which a wire electrode 1 is inserted into the cylindrical body, and the wire electrode 1 is slid in contact with one wall surface of the circular hole 2a to supply electricity.

By rotating the cylindrical current-carrying body 2 to change the contact position of the wire electrode 1 each time the wall surface of the hole in contact with the wire electrode 1 wears out, a long-life current can be provided.

However, the wire electrode 1 that contacts the inner wall surface of the cylindrical current-carrying body 2 is a point (line) contact, and when a large current is applied, the current increases, heats up, and wears out, making it impossible to stably apply a large current. Another disadvantage is that the wire electrode 1 in contact with the wall surface of the circular hole 2a shifts its contact position and changes its trajectory due to vibration or box impact, making it impossible to conduct electricity stably.

[Means for solving problems]

The present invention has been proposed in view of the above-mentioned drawbacks, and includes two or more elongated current-carrying bodies having circular outer circumferences, which are provided in parallel with each other and in contact with each other or with a minute gap maintained, and a groove is formed between the elongated current-carrying bodies. This is characterized in that the wire electrode is brought into contact with and moved to apply electricity.

〔Example〕

The present invention will be explained below with reference to an embodiment of the drawings.

FIG. 2 is a side view, and FIG. 3 is a cross-sectional view. Reference numeral 1 denotes a wire electrode, which is supplied from a reel (not shown) and moves between guides for a processing section that faces the workpiece and is processed. Reference numeral 3 denotes a current-carrying body for applying machining current to the wire electrode 1, which is located at the wire electrode portion on one or both sides of the workpiece, and as shown in the figure, a long body with a circular outer periphery with edges cut off at both ends is connected to each other. The wire electrodes 1 are provided in parallel with each other in contact or with a small gap maintained, and the wire electrode 1 is brought into contact with and moved in parallel to the parallel grooves of both to supply electricity. Reference numeral 6 denotes a roller that presses the wire electrode 1 against the current-carrying body 3. The current-carrying body is fitted and supported by the annular boulder 4 as shown in the top view of FIG. 3, and can be rotated by a drive roller 5 in contact with the outer periphery of the holder.

The wire electrode 1 and the circular current carrying body 3 are in contact at at least two points P+ and P2 as shown in the enlarged view of FIG. ! il contact, the current-carrying area increases to more than twice that of the conventional one, and the current-carrying current density can be reduced to X or less.

Further, since the parallel grooves of the current-carrying body 3 that are in parallel contact with each other are formed in a V-shape, and the wire electrode 1 is fitted into contact therewith, when the wire electrode 1 moves, it is prevented from coming off the groove due to vibration and causing a trajectory change. This enables stable running and contact energization.

In addition, when the part of the current carrying body 3 that contacts the moving wire electrode 1 is worn out, the circular holder 4 is rotated by the driving roller 5, so that the circular current carrying body 3 rotates and the position of the contact part is changed. Since the entire outer periphery of the current-carrying body 3 can be utilized, a long life and stable current supply can be achieved.

In FIG. 5, rotary gears 7 are provided which engage with each of the current-carrying bodies 3, and these are rotated by a drive gear 8. 9
1 is a rotary motor, 10 is an encoder, and if angle indexing is controlled by detecting the position of the encoder 10, the entire circumferential surface of the current-carrying body 3 can be used uniformly. Furthermore, if the motor is continuously rotated and the current carrying body 3 is rotated at a low speed, the entire circumferential surface of the current carrying body 3 can be worn out evenly, increasing the current carrying area and preventing the wire electrode 1 from digging in due to rotational movement. It is possible to conduct electricity stably.

Although the present invention has been described above with reference to one embodiment, the current-carrying body 3 may be either a cylinder or a cylinder, and two or more can be combined in parallel. FIG. 6 shows an embodiment in which a mouth-shaped holder 11 is provided on the holder of the current-carrying body 3 to support it, or a V-shaped frame holder may be used.

Alternatively, stable contact can be achieved by applying spring pressure from the side to which the wire electrode 1 is to be brought into contact.

〔Effect of the invention〕

As described above, the wire electrode current-carrying device of the present invention includes two or more long current-carrying bodies having circular outer peripheries, which are provided in parallel to each other and in contact with each other or with a minute gap maintained, and the grooves formed between the long current-carrying bodies are Since the wire electrodes are moved in contact to conduct electricity, the contact current carrying area increases and the current density decreases, making it possible to carry out large currents efficiently, reducing heating and wear of the current carrying parts, and ensuring stable electricity supply. be able to. In addition, since the wire electrode is moved and moved by fitting into the square groove formed by the parallel contact of the circular current-carrying bodies, stable contact current can be applied without changing the trajectory.

Furthermore, by rotating the contact portion each time the current carrying body wears out, the entire circular outer peripheral surface of the current carrying body can be utilized, and the life of the current carrying device can be significantly extended.

In addition, if the current carrying body is rotated continuously, the entire circumference of the current carrying body can be uniformly consumed and used, and the rotating movement of the current carrying body can prevent the wire from digging into the groove of the electrode, resulting in stable energization. can do.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is a side view of an embodiment of the present invention, Fig. 3 is a cross-sectional view, Fig. 4 is a partially enlarged explanatory diagram, and Figs. 5 and 6. is a top view of another embodiment. 1...Wire electrode 3...Current body 4...Holder Patent Applicant: Representative of Inoue Japax Laboratory Co., Ltd. Figure 1 Figure 2 Figure 5 Figure 6

Claims (1)

[Claims] In a wire-cut electrical discharge machining device that performs electrical discharge machining by passing pulses of electricity from a processing power supply between a wire electrode moving between upper and lower guides and a workpiece, an energization device that supplies current to the wire electrode from the processing power supply, 2 of long current carrying body with circular outer circumference
A wire-cut electrical discharge machining apparatus characterized in that the above elements are arranged parallel to each other and in contact with each other or with a minute gap maintained, and the wire electrode is moved in contact with a groove formed between the elongated current-carrying bodies to conduct electricity. energizing device.