Patent ID: 9446466
Filing Date: 2016-09-20
CPC Classification: B23H,G05B

Claim Text:
1. A wire electrical discharge machine, comprising: a machining power supply; a wire electrode, which is stretched under tension between an upper wire guide and a lower wire guide; at least one linear axis and a rotation axis extending parallel to the linear axis, for moving a workpiece relative to the wire electrode along the linear axis and for rotating the workpiece about the rotation axis, according to a machining program, whereby the workpiece is machined; an average rotation radius calculation unit configured to calculate an average rotation radius based on an outer radius and an inner radius of the workpiece designated in each block of the machining program; a current average rotation radius calculation unit configured to calculate a current average rotation radius at a current workpiece machining point for each predetermined period, based on a control unit configured to perform control such that the speed of relative movement of the wire electrode and the workpiece at the current workpiece machining point agrees with a command speed acquired from the machining power supply, based on the current average rotation radius calculated by the current rotation radius calculation unit.