Electric discharge machining oil composition, manufacturing method and electric discharge machining method of electric discharge machining oil composition

摘要

The present invention relates to an electric discharge machining oil composition and an electric discharge machining method that can improve the machining speed in electric discharge machining. The discharge processing oil composition of the present invention is one or more petroleum resins selected from (A) a base oil and (B) a hydrogenated compound of a copolymer of dicyclopentadiene and an aromatic compound, and is softened. It is characterized by containing a petroleum resin having a point of 75 to 185 ° C. and a number average molecular weight (Mn) of 670 to 3000, and having a kinematic viscosity at 40 ° C. of 1 to 10 mm2 / s. Further, the electric discharge machining method of the present invention is characterized in that the electric discharge machining oil composition is used, the electric discharge machining oil composition is interposed between the workpiece and the electrode, and the workpiece and the electrode are in this state. Includes processing an workpiece by generating an electric discharge between the and.