| 摘要 |
A wire-cut EDM method and apparatus in which an electrode wire traveling between a pair of wire-positioning guide members is laterally advanced, generally tangentially along a workpiece contour disposed therebetween to electro-erosively cut a precision contour in the workpiece contour with a depth of cut at most equal to the diameter of the wire. The fluctuating machining pressure, induced by the gap erosive electrical discharges and fluid injection, tends to undulate the traveling wire in the open space flanking the contour being cut and to misalign the axial position thereof away from a prescribed path of advance in the cutting zone. A rotary mechanism, rotatable about its axis of rotation coinciding with the straight-line path established for the traveling wire axis between the wire positioning guide members, carries a wire-backing support member disposed in the cutting zone and having wire supporting surfaces parallel to that straight-line path to hold the traveling wire against the machining pressure, and is rotated to orient the wire-backing support member so as to oppose those surfaces with the area of contour being cut and to avoid a collision of the support member with the workpiece.
|
