Wire electrical discharge machining apparatus

摘要

A wire electrical discharge machining apparatus which cuts to a desired shape a workpiece placed on a workpiece table, using a discharge phenomenon occurring between the workpiece and a wire electrode opposite to the workpiece with a machining fluid in a space therebetween, characterized in that the workpiece table is made of cast iron having a coefficient of thermal expansion of less than 6x10-6/ DEG C. and that a surface layer is provided on the workpiece table on which a workpiece is placed, the surface layer having corrosion resistance to the machining fluid and having a hardness higher than that of the material constituting the workpiece table.