Auxiliary method and device for wire cut electrical discharge machining

Abstract

The present invention discloses an auxiliary method and device for wire cut electrical discharge machining. The method comprises applying a magnetic field which is perpendicular to a machining direction and a wire electrode direction at the same time to a workpiece in a wire cut electrical discharge machining process. The device comprises a direct current excitation source and electromagnets. A discharge ion passage in wire cut electrical discharge machining is restricted and compressed through the applied magnetic field, and a lorentz force acting on the discharge ion passage and a lorentz force acting on a wire electrode are generated, so ion density of the discharge ion passage is raised, collision of charged ions in the discharge ion passage is intensified, discharge contact points of a working surface are increased, and a function of raising a material removal rate is achieved. Charged ion disturbances at surfaces of the electrodes are reduced through the magnetic field, stability of the discharge iron passage and discharge stability in wire cut electrical discharge machining are improved, and thus the surface quality of the manufactured workpieces is raised.

Description

technical field [0001] The invention belongs to the technical field of wire electric discharge machining for special processing, and more specifically relates to an auxiliary method and device for wire electric discharge machining. Background technique [0002] With the development of modern industry, the quality requirements of mechanical products are getting higher and higher. Traditional processing methods are difficult to meet the processing conditions of various ultra-precision, new materials with complex surfaces, and new structures. Special processing methods are required to process these material or structure to be processed. Special processing is characterized by non-mechanical contact, no macroscopic cutting force, but a processing method that uses non-mechanical energy (light, electricity, magnetism, heat, chemistry, etc.) to remove materials. [0003] Wire EDM is a special processing method that uses electric energy to process metal materials, and uses the conti...

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Problems solved by technology

[0004] Although WEDM machining has high precision and the surface quality of the obtained workpiece is good, in order to obtain good surface quality, it is necessary to pay the price of processing efficiency and manufacturing cost; moreover, WEDM process is a severe thermal process. The heat energy generated instantly by the discharge pulse corrodes a certain volume of material, resulting in the melting, evaporation and ionization of the material at the pulse discharge point; some cracks, pits and recasting layers are inevitably generated on the surface of the workpiece, and the discharge is unstable. If the residue is not effectively washed away by the working fluid in time, the discharge channel will be shortened, resulting in reduced processing efficiency and reduced surface quality of the workpiece

Some scholars propose to apply vibration to the workpiece or the electrode wire to improve the scouring ability of the residue between the electrode wire and the workpiece, so as to improve the processing efficiency and surface quality. would have the opposite effect

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