レーザ照射による放電加工面の改質

概要

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An electro-discharge machining technique (EDM) is now widely used for various kinds of die making. However, the surface yields and the resultant thermally induced cracks, white layer and micro-craters may have a detrimental effect on die life. The present paper deals with a new surface modification method which applies laser beam on the surface of cemented carbide having cracks and micro-craters, and obtains the following results. The heataffected zones of cracks and micro-craters are removed due to isolation of WC based on melting of Co acting as a binder. The abnormal structures consisting of face-centered cubic and close-packed hexagonal structures of the surface machined by EDM are transformed to a hexagonal lattice in stable structure by laser irradiation. Thus, it could be verified that laser irradiation modifies the surface of cemented carbide including the heat-affected zones to a sintered state before machined by EDM.
公益社団法人精密工学会の論文
1994-06-05