| 摘要 |
825,165. Removing metal by electro-erosion. WICKMAN Ltd. Feb. 4, 1958 [Feb. 25, 1957], No. 6192/57. Class 83 (4). In the cutting or shaping of a workpiece by electric spark erosion the workpiece is vibrated rapidly during erosion in the feed direction of the electrode at a frequency less than the resonant frequency of the work-holder d and the associated parts movable therewith. The workpiece is supported on a table d carried by blade springs e from a support c in a liquiddielectric tank b. The table d is vibrated through a distance equal to about half the length of the spark gap by an electromagnet i fed with alternating or intermittent current. Alternatively the table may be vibrated by a cam or by wave motions in an hydraulic vibrator. |
