Patent ID: 6930275
Filing Date: 2005-08-16
Classification: B23K,G05B

Abstract:
1. A three dimensional linear machining apparatus having means for rotating, holding and driving, by which a workpiece a sectional shape of which has a corner, can be held with a first axis as its center and said workpiece can also be held so as to be freely angularly rotated, and driven in a first rotational axis direction with said first axis, and a machining portion provided so as to be freely moved and driven in said first axial direction and second and third axial directions orthogonal to each other so as to be freely angularly rotated and driven in second and third rotational axis directions with said second and third axes as their centers with respect to said workpiece held by said means for rotating, holding and driving, comprising: rotation control means, for controlling said means for rotating, holding and driving so that said workpiece is rotated a predetermined angle around said first axis and so that said corner to be machined can be moved along a rotational arc having a predetermined rotational radius; means for controlling said machining portion so as to move along said rotational arc having said predetermined rotational radius, synchronizing with rotation of said corner to be machined; means for computing axial speed, for computing angular velocity in said first, second and third rotational axis directions and moving speed in said first, second and third axial directions so as to correspond a feed speed of said machining portion with respect to said workpiece with feed speed instructed in a machining program at the time of execution of a concurrent six axes cylindrical interpolation instruction in which a feed speed at the time of machining on said corner of said workpiece is instructed in said machining program; and means for executing machining on said corner of said workpiece by simultaneously controlling said first, second and third axes and said first, second and third rotational axes on the basis of said angular velocity in said first, second and third rotational directions and said moving speed in said first, second and third axial directions, which are computed by said means for computing axial speed.