ELECTRIC DISCHARGE MACHINING METHOD FOR WORKPIECE

PROBLEM TO BE SOLVED: To provide an electric discharge machining method for a workpiece capable of realizing excellent electric discharge machining.SOLUTION: An electric discharge machining method for a workpiece includes a fixing step of electrically joining and fixing the workpiece to a base and an electric discharge machining step of machining the workpiece by discharge generated between the workpiece joined to the base and a wire by impressing high frequency pulse voltage between the wire and the base after executing the fixing step, by using a wire electric discharge machine (2) having a wire (4) having electric conductivity, guide roller groups (24, 26, 28 and 30) of winding the wire in a plurality of times, the base (42) for fixing the workpiece (11) and having electric conductivity, movement means (48) for cutting the wire in the workpiece fixed to the base by relatively moving the base and the wire and a high frequency pulse power source unit (50) electrically connected to the wire and the base and generating the high frequency pulse voltage, and joins the workpiece to the base by ultrasonic soldering for imparting ultrasonic vibration to melted solder (13) in the fixing step.SELECTED DRAWING: Figure 2 【課題】良好な放電加工を実現できる被加工物の放電加工方法を提供する。【解決手段】被加工物の放電加工方法であって、導電性を備えたワイヤ（４）と、ワイヤが複数回巻き掛けられるガイドローラー群（２４，２６，２８，３０）と、被加工物（１１）を固定する導電性を備えた基台（４２）と、基台とワイヤとを相対的に移動させ基台に固定した被加工物にワイヤを切り込ませる移動手段（４８）と、ワイヤと基台とに電気的に接続され高周波パルス電圧を発生する高周波パルス電源ユニット（５０）と、を有するワイヤ放電加工装置（２）を用い、基台に対して被加工物を電気的に接合するとともに固定する固定ステップと、固定ステップを実施した後、ワイヤと基台との間に高周波パルス電圧を印加し、基台に接合した被加工物とワイヤとの間で生じる放電によって被加工物を加工する放電加工ステップと、を含み、固定ステップでは、溶融した半田（１３）に超音波振動を付与する超音波半田付けによって基台に被加工物を接合する。【選択図】図２