JPH0459091B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a current-carrying device, particularly a current-carrying device of a wire-cut electric discharge machine, a belt cutting machine, and the like.

[Prior art and problems]

Conventionally, a wire-cut electric discharge machine uses a power supply plate, power supply pin, or the like for supplying current to the wire electrode, but if the wire is worn out and the wire digs in over a long period of time, the wire is likely to break. Furthermore, there is a drawback that the occurrence of rust may impede current flow or cause wire breakage.

[Means for solving problems]

The present invention has been proposed in order to improve the above points, and includes a device that provides a current-carrying current that contacts and energizes an electrode that constantly travels during processing, and controls the relative movement of the contact position between the current-carrying current and the electrode. It is characterized by having been provided.

〔Example〕

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

1 is the wire electrode of the wire cut electric discharge machine,
A thin wire with a wire diameter of approximately 0.05 to 0.3 mm is used, and is stored on a reel 2 and fed out. Electric discharge machining is performed while facing the workpiece while continuously moving during machining. Reference numeral 3 denotes a conductor for applying a machining current to the wire electrode 1, and the cross section perpendicular to the axis has a circular or polygonal shape, and the axis of the conductor 3 and the wire electrode axis are arranged so as to be perpendicular to each other. At the same time, contact current is applied to the wire electrode at the current-carrying portion 31 on the circumferential side of the current-carrying element 3. In addition, the current-carrying part 31 of the electricity-carrying element 3
Guards 32 are provided at both ends, and the wire electrode 1 is pressed against the current-carrying portion 31 to apply electricity. Reference numeral 4 denotes a rotary disk, and an eccentric rod 5 is provided thereon, which engages with a support shaft 6 of the conductor 3 to cause the conductor 3 to reciprocate in a direction perpendicular to the wire axis.

FIG. 2 is a side view of a cylindrical conductor, and FIG. 3 is a side view of a quadrangular prism conductor.

In the above, during electrical discharge machining, the wire electrode 1 is supplied from the reel 2, runs and moves with a predetermined tension and speed, and electrical discharge machining is performed with the guided wire facing the workpiece. The electric discharge machining current is applied to the wire electrode 1 by contacting the wire electrode 3 with the electric current. The conductor 3 that comes into contact with the moving wire electrode 1 is engaged with the support shaft 6 by the eccentric rod 5 of the rotary plate 4 and reciprocates at right angles to the wire moving axis, so that the contact portion between the conductor 31 and the wire 1 always moves and changes position. Therefore, when the wire 1 comes into contact with one location of the current-carrying portion 31, the current-carrying portion 31 is worn out and the wire 1 gradually digs into the current-carrying wear groove.
By constantly changing the contact position by the movement of the conductor 3, such digging can be prevented, and stable current conduction without breakage or the like can be performed.

Note that the reciprocating movement of the conductor in the orthogonal direction does not have to be always continuous, but may be an intermittent movement. Alternatively, the wire electrode may be moved laterally. As the exercise device, any drive mechanism using a motor, cylinder, electromagnet, etc. can be used. Furthermore, in addition to the reciprocating motion, it is also possible to rotate the current-carrying current around its center axis so that the entire circumference of the current-carrying part comes into contact with the wire electrode, which is effective in increasing the lifespan.

In the past, wear-resistant WC type materials were generally used for conducting current, but in the present invention, Cu materials, W materials, etc. can also be used. For example, when cutting wire with WC-Co current, the processing current is 8A and the processing speed is 100%.
When mm ² /min, the life is approximately 80H, 4.5A, 50mm ² /min
However, when moving the electric current at a speed of 10mm/100H in the perpendicular direction, the 8A
Approximately 800 hours of continuous machining was possible. Furthermore, when the current-carrying electron was moved in the direction of rotation around the axis at a rate of 50μ/H, approximately 1860H of machining was possible. In addition, Cu
When fabricated using WC-Co, its life span was about half that of WC-Co, corresponding to the WC-Co conduction experiments described above. In addition, for electrical machining, a 0.2 mmBs wire electrode is moved at 2 m/min, and the machining fluid is 5×10 ⁴
This is the case when electrical discharge machining is performed using water with a specific resistance of Ωcm.

〔effect〕

As described above, in the present invention, the axis of the columnar conductor is arranged so as to be orthogonal to the direction of movement of the electrode, and the circumferential surface of the conductor is brought into contact with the electrode, thereby energizing the conductor. By providing a device that controls reciprocating movement relative to the electrode in the direction along the axis of the electrode, the contact position between the current-carrying current and the electrode can be constantly changed. Stable processing is possible without wire breakage, etc., and since the electrode is constantly moved by friction on the contact surface to prevent rust and adhesion of insulators, it has the effect of stably and efficiently conducting current.

The present invention is highly effective in wire-cut electric discharge machining, cutting machines using charged electrodes, polishing machines, etc.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the main parts of an embodiment of the present invention, Figure 2
FIG. 3 is a side view of an embodiment of the conductor. DESCRIPTION OF SYMBOLS 1...Wire electrode, 2...Reel, 3...Electric current, 4...Rotating disk, 5...Rod, 6...Support shaft.

Claims (1)

[Claims] 1. In a device that processes a wire or a band-shaped electrode by passing current between it and the workpiece while moving, the axis of the columnar current-carrying element whose cross section perpendicular to the axis is circular or polygonal is used to move the electrode. The columnar conductor is disposed so as to be orthogonal to the direction, and is energized by bringing the circumferential side of the columnar conductor into contact with the electrode, and the conductor is reciprocated relative to the electrode in the direction along the axis of the conductor. An electrical processing device characterized by being provided with a device that provides movement control.