| 摘要 |
PURPOSE:To highly effectively apply rocking processing by performing electrical discharge machining while providing a relative rocking motion between an electrode and a workpiece, and changing said processing from a rough to a finishing conditon when the amplitude of said rocking motion reaches to a set value. CONSTITUTION:A relative rocking motion is provided between an electrode 1 and a workpiece 2 to perform electrical discharge processing. The radius (r) of the rocking motion is controlled such that it is small in the first place and becomes larger with the progress of the processing. The rocking motion is performed by driving a table 3 in the X, Y directions with an NC control device 6. The processing condition is set in a rough processing condition in the beginning, and when the rocking radius (r) reaches the value set by a setting circuit 8, a signal is issued from a switching circuit 15 to change the time interval of a pulse generating circuit 13, permitting the processing condition to be changed to a finish processing condition. When the rocking radius reaches the final value, the processing is stopped. In this way, the processing efficiency of the rocking processing is improved. |
