A method of electric discharge milling for micro three-dimensional parts

Abstract

The invention discloses an electric spark milling method of a micro three-dimensional part. The electric spark milling method comprises the following steps that a tool electrode having appropriate diameter is adopted; an electrical guiding rule and parameters are set according to the diameter of the tool electrode; a length loss rate and a discharging gap are determined; the tool electrode is subjected to predeformation; and milling programs for each electric spark numerical control layering of a work piece are established. Based on the shape characteristic of the tool electrode at a high frequency power source, the tool electrode actively deforms, then the deformed tool electrode is subjected to layering milling by adopting a continuous compensation process, and the influence of interlayer feeding processing on the shape of the tool electrode is eliminated through a preprocessed hole. Aiming at the shape change in a micro electric spark processing procedure, the electric spark milling method for keeping the shape of the tool electrode stable on the specific electrical guiding rule condition is provided, tool electrode shape constant loss is realized, the problem of shape change due to loss of the tool electrode in the micro electric spark processing procedure is solved, and a processing technique index reaches a higher level.

Description

technical field [0001] The invention relates to the processing technology of micro-three-dimensional parts, in particular to a method for electric discharge machining of micro-three-dimensional parts with complex curved surfaces, microstructures and fine dimensions. Background technique [0002] With the rise of micro-electromechanical systems and the urgent requirements for micro-machines in the field of engineering technology, more and more micro-parts have further complicated shapes and further reduced sizes. Traditional machining methods have long been unable to adapt to such micro-parts processing. Three-beam machining, electrochemical machining, EDM (removal machining), LIGA technology, and 3D printing technology (additive machining) have emerged. Three-beam processing has the problems of high energy beam density, uneven distribution, and large diameter; electrochemical processing has pollution and corrosion problems; LIGA technology and 3D printing technology have sho...

AI Technical Summary

Problems solved by technology

Three-beam processing has the problems of high energy beam density, uneven distribution, and large diameter; electrochemical processing has pollution and corrosion problems; LIGA technology and 3D printing technology have shortcomings such as inability to make complex three-dimensional structures and low precision.

It can be seen from the mechanism of EDM that the shape and length of the tool electrode change due to tip discharge, and the impact of interlayer feeding and intralayer processing on the shape change of the tool electrode is also different, and shape compensation is extremely difficult; the common uniform loss compensation , fixed-length compensation and other methods cannot meet the requirements for high-precision quality and high-efficiency processing of the processed parts, so micro-EDM layered milling has not been widely used in industry

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