| 摘要 |
<p>An apparatus for electrodischarge machining includes a quill (8) capable of moving in vertical directions; at least one set of linear motor rotors attached to the quill symmetrically with the axis of the quill; and a set of linear motor stators opposed to the set of rotors. An electrode mount (9) for holding a tool electrode (6) is attached to the lower end of the quill in such a manner that it is coaxial with the quill axis. Preferably, the set of rotors include magnet plates (12, 14) attached to the quill, and permanent magnets (11, 13, 15, 16) arranged in stripes on the magnet plates, while the set of stators include yokes (31, 41) and coils (32, 42) wound on the yokes. The quill has a vertical hole (8a) extending in its center, and air cylinder (61) is placed in the hole to balance the load of the quill. The quill has a density less than 4g/cm3, for example, composed of silicon nitride ceramic (Si¿3?N4) or a compound of light metal and more than 40 percent ceramic by volume.</p> |
