| 摘要 |
An oscillating device (6) is secured to the lower end of a column (2) in a die sinking electrical discharge apparatus (1), and an electrode holder (7) is mounted to the oscillating device (6) for holding a tool electrode (3). The oscillating device (6) comprises a block (8) of a material having a suitable elasticity, and right and left piezo-electric devices (9a, 9b) embedded in the block (8) in a pre-loaded condition. These piezo-electric devices (9a, 9b) are alternately driven to impart movements to the tool electrode (3) such that it repeats a displacement in a predetermined direction and in a substantially reverse direction at a substantilly short cycle, which displacement is substantially smaller than a spacing between the tool electrode (3) and a workpiece (5) during processing. <IMAGE> |
