電子ビーム加工における溶融層の形成とAEの発生

抄録

Measurements of acoustic emission were made for pulsed electron beam machining of stainless steel. Two different types of acoustic emission are observed according to progression of the machining. Signal level is low while molten metal is removed outside the target ; however, burst signals of high level are generated intermittently when the molten metal begins to fill in the hole. Occurrence of the burst signals is found out to be related to the molten metal quantity remaining in the hole. The occurrence frequency increases with the remaining quantity ; therefore, the occurrence of this signal indicates that the drilling process proceeds to the welding process. This phenomenon can be utilized for monitoring the machining process and for determining the proper condition of drilling.