| 摘要 |
<p>A sinker electric discharge machining apparatus includes a quill 10, to which a tool electrode is attached, and a linear motor device configured to generate a linear movement of the quill towards a workpiece. The quill includes a plate member 11 made of a metal or an alloy, a first reinforcing member 51 fixed to a front surface 14 of the plate member, a second reinforcing member 52 fixed to the front surface of the plate member, a third reinforcing member 53 fixed to a back surface 15 of the plate member and disposed opposite to the first reinforcing member across the plate member, and a fourth reinforcing member 54 fixed to the back surface of the plate member and disposed opposite to the second reinforcing member across the plate member. The quill has a cross-section that is symmetric in a width direction of the plate member.</p> |
