JPS61236431A - Wire cut electric discharge machine - Google Patents

Abstract

PURPOSE:To prevent a wire electrode from breaking due to generation of heat, by forming a fluid path inside an electrifying member and jetting cooling fluid to flow. CONSTITUTION:Electrifying members 3 of a wire electrode form contact surfaces 3a in external surfaces while fluid paths 3b inside said members. The contact surface, providing an electrifiable hard material of TiC, Wc, TaC, etc., improves wearing resistance. A machine, jetting cooling fluid to flow from pipes 4 in the fluid paths 3b of the electrifying members 3 and maintaining the member 3 continually in a cooled condition, enables the wire electrode 1 to be electrified by a large machining current from a machining power supply 6. If the cooling fluid supplied from the pipe 4 uses machining fluid, the machine enables the fluid path 3b to be used serving also as a supply nozzle of the machining fluid by placing the fluid path 3b facing toward the machined part of a work 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a wire-cut electrical discharge machining device that performs electrical discharge machining using a thin wire as an electrode.

[Prior art and one problem] Conventionally, the wire electrode is energized by contacting it with an energizing bottle. The contact area with the current-carrying bottle was small and the current loss was large. Further, in this case, when the current-carrying bottle is energized in the air, the wire electrode becomes hot and easily breaks, making it impossible to perform high-speed machining by applying a large current. Furthermore, when electricity is applied in cooling water to cool the energizing bottle, the wire electrode cannot be energized as an anode because the polarity causes electrolytic corrosion and disconnection.

[Means for solving problems]

The present invention has been proposed in view of the above-mentioned drawbacks of the conventional art, and includes a means for cooling by providing a current-carrying member having a current-carrying contact surface formed on the outside and a fluid path formed inside, and cooling fluid by flowing it through the internal fluid path. The present invention is characterized in that a means for moving the wire electrode in contact with the external contact surface is provided, and a processing power source is applied to the wire electrode from the current-carrying member.

〔Example〕

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

The wire electrode 1 is supplied from a reel (not shown), and is controlled to run and move with the required tension and speed while passing through a guide, and moves continuously in the direction of the arrow.

Reference numeral 2 denotes a workpiece to be subjected to electric discharge machining in opposition to the wire electrode 1, which is usually fixed to a NC-controlled machining table, and relative movement control of the machining shape between the workpiece and the wire electrode 1 is performed. 3 is a current-carrying member of a wire electrode, and a contact surface 3a is provided on the external surface.
, and a fluid path 3b is formed inside. Incidentally, the wear resistance can be improved by providing an electrically conductive hard ITi C, WC, "jac, etc. on the contact surface. 4 is a vibrator that communicates with the fluid path 3b and supplies a cooling liquid supplied by a pump or the like; 5 is a pinch roller that moves the wire electrode 1 along the contact surface 3a; 6 is a pulse power source for machining, and the other is a pulse power source for processing, which directly applies electricity from the current-carrying member 3 to the wire electrode 1, and the other directly to the workpiece 2.

As described above, the current-carrying members 3 are provided above and below the object 2 to be processed, and guide the wire electrode 1 to face the object 2 to be processed. That is, the current-carrying member 3 is wired, moves in contact with and is guided along the curved contact surface 3a, faces the workpiece 2, and passes through it. At this time, cooling fluid is jetted from the vibrator 4 into the fluid path 3b of the current-carrying member, so that the member 3 is always maintained in a cooled state, and a large processing current can be passed from the processing power source 6 to the wire electrode 1. The machining fluid used is water that has been subjected to ion exchange treatment, or a machining fluid that is mainly water with addition of a surfactant. By directing the nozzle toward the machining part, it can also be used as a machining fluid supply nozzle. In this way, the machining liquid is supplied to the opposing gap between the wire N#4i1 and the workpiece 2, and machining pulses are supplied from the machining power source 6 and the pulse discharge is repeated to perform machining.

During machining, a relative machining feed of the machining shape is applied between the wire electrode 1 and the workpiece 2 by NC control as the machining progresses, and the wire is cut according to the feed shape.

Note that the present invention is not limited to the above embodiments, and the guide for the wire electrode 1, the machining fluid supply nozzle, etc. can be provided in addition to the current-carrying member, and the current-carrying member can be provided only on one of the upper and lower sides. [Effects] As described above, according to the present invention, a current-carrying member is provided with a contact surface formed on the outside and a fluid path formed inside, and the internal fluid path is Since the machining electrode and the wire electrode are energized while being cooled by a jet of cooling liquid, the wire electrode can be energized with sufficient cooling, and breakage of the wire electrode due to heat generation can be prevented. , high-speed machining by applying large current can be easily performed. In addition, the wire electrode is brought into contact with the contact surface 3a of the current-carrying member 3 by a pressure means such as a pinch roller, and is moved along the surface, so that the contact current-carrying area is sufficiently increased and heat generation at the contact current-carrying portion is reduced. In addition, it is possible to reduce current flow resistance, reduce current flow loss, waveform distortion, etc., and successfully conduct a large current. In addition, since the wire electrode is in contact with the current-carrying member in the air, there is no disconnection due to electrolytic corrosion, and since there is no electrolytic corrosion, the conducting polarity can be arbitrarily selected, and the energization of positive and negative pulses can be arbitrarily selected, and wire-cut discharge is possible. Machining performance can be sufficiently improved.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of one embodiment of the present invention. 1...Wire electrode 2...Workpiece 3...Electrifying member 3a...Contact surface 3b ......Fluid path 4...Cooling liquid supply vibe 5...
・・・Pinch roller 6・・・・・・Processing power supply patent applicant Kiyoshi Inoue Representative of Inoue Japax Laboratory Co., Ltd.

Claims (1)

[Claims] In wire-cut electrical discharge machining, in which processing is performed by supplying machining fluid to the gap facing the workpiece while moving the wire electrode between guides, and repeating pulsed discharge by applying electricity, a current-carrying contact surface is formed on the outside. a current-carrying member having a fluid path formed therein; a means for cooling the internal fluid path by jetting a cooling fluid; and a means for moving the wire electrode along the external contact surface; A wire-cut electrical discharge machining device characterized in that a machining power source is applied to a wire electrode from the wire.