Method of and device for adjusting perpendicularity of wire of wire-cut electric discharge machine

Abstract

A method of and a device for adjusting perpendicularity of a wire of a wire-cut electric discharge machine for performing a precise electric discharge machining with low cost. The wire is inclined in a U-axis direction to enable the wire to come into contact with only a lower contact piece of an adjusting jig. The wire is held at fixed positions with no play at an upper wire guide and the lower wire guide in this inclined state. The adjusting jig is move in the Y-axis direction to bring the wire into contact with only the lower wire guide and a position Y of the contact is stored. The adjusting jig is move in the X-axis direction to enable the wire to come into contact with only the upper contact piece, and the adjusting jig is move in the Y-axis direction to bring the wire into contact with the upper wire guide and a position Y of the contact is stored. A displacement of the upper wire guide in the V-axis direction is obtained based on a difference &Dgr;Y between the contact positions Y and Y and a distance D between the two contact pieces and a difference H between the upper and the lower wire guides, to compensate the displacement of the upper guide according to the displacement amount. The above procedure is repeatedly performed until the difference &Dgr;Y is within an allowable range. An adjustment of perpendicularity of the wire in the U-axis direction is performed in the similar manner.