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Electric discharge machining electrode and method

A technology of electrodes and electrode materials, applied in electric processing equipment, electrode manufacturing, metal processing equipment, etc., can solve problems such as poor surface finish

Inactive Publication Date: 2005-04-20
UNIV LAVAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even with the clear advantages of these processes in terms of manufacturing flexibility and lead time, the surface finish is poor at best, limited to around 12 μm RMS (500 microinches RMS)

Method used

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  • Electric discharge machining electrode and method
  • Electric discharge machining electrode and method
  • Electric discharge machining electrode and method

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Embodiment Construction

[0034] In general, it is an object of the present invention to reduce the cost of EDM operations by: 1) by providing malleable electrodes which can be fabricated with improved productivity; 2) by providing a method which uses these malleable electrodes for roughing, finishing, polishing and texturing operations.

[0035] According to a first aspect of the present invention, a plastic electrode and a method for making the electrode are provided.

[0036] The plastic electrodes of the present invention are generally made using a plastic carbonaceous material prepared by mixing appropriate proportions of carbon powder and / or metal powder in a thermoplastic polymer or wax matrix. The amount of solid carbon is optimized to produce a material that combines the required combination of plasticity, electrical conductivity and, at the same time, formability.

[0037] The main components of the EDM plastic electrode are carbon and graphite because of their inherent high temperature resi...

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PUM

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Abstract

A method of electrical discharge machining (EDM) using a malleable carbon electrode that automates roughing, finishing, finishing, and texturing operations on conductive materials. The EDM method involves the use of a moldable conductive electrode made of a carbon-polymer composite. Electrodes are made by uniformly heating a specified amount of said plastic electrode material at a temperature near the melting point of the polymer matrix prior to electrical discharge machining. Next, the composite material is formed into the desired electrode shape by pressing the soft material onto a template, a mold pattern, the workpiece, or a replica of a portion of the workpiece. The workpiece is then machined to the desired shape and surface finish using the formed electrodes using appropriate electrical discharge machining techniques. By adopting an initial softening and pressing procedure when the dimensions of the electrode and its surface have changed due to wear, the same electrode can be repaired quickly and repeatedly until the workpiece is complete.

Description

technical field [0001] The present invention relates to finishing, polishing and texturing methods. More specifically, the present invention relates to electrical discharge machining electrodes and methods. Background technique [0002] As is well known in the art, electrical discharge machining (EDM) allows metal to be removed from a workpiece by the energy of an electric spark that creates an electric arc between a tool and a surface of the workpiece, both of which are immersed in a in a dielectric fluid. Rapid electrical pulses are delivered to the tool causing sparks to flow in and out between the tool and workpiece. The heat generated by each spark melts a small amount of metal away from the workpiece. When the metal is thus removed, the dielectric fluid circulating across the spark gap cools and washes away the metal. The resulting surface finish is inversely proportional to the discharge frequency, while the height of final rugosities is inversely proportional to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23H1/04B23H1/06B23H1/08C04B35/52
CPCB23H1/04B23H1/06B23H1/08B82Y30/00
Inventor A·库罗多M-F·吉杜安
Owner UNIV LAVAL
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