Patent ID: 8975553
Filing Date: 2015-03-10
Classification: B23H

Abstract:
1. A workpiece mounting table for an electric discharge machine that machines a workpiece by discharging electricity between an electrode and the workpiece in an interior of a work tank and removing a surface of the workpiece, the workpiece mounting table comprising: a surface-plate mounting table, made of an electrically conductive material, arranged at a bottom of the work tank; a plurality of insulating plates, made of an electrically insulating material, each of which has a flat shape and is arranged and fixed on the surface-plate mounting table with a gap between the plurality of insulating plates to constitute an electrically insulating flat plate; and a surface plate, made of a metal material, fixed on the electrically insulating flat plate and electrically insulated from the surface-plate mounting table by the electrically insulating flat plate, for fixing thereon the workpiece, wherein the surface-plate mounting table includes a downwardly-recessed discharging shaped portion at a portion corresponding to the gap between the plurality of insulating plates.