Patent ID: 7869897
Filing Date: 2011-01-11
Classification: G05B

Abstract:
1. A numerical control method for controlling a five-axis processing machine having three linear axes and two rotational axes, in which a milling tool which does not have a corner radius section or a ball end mill is used, linear axis control points and rotational axis control points are determined at respective interpolation cycles, based on a tool diameter compensation amount and a tool length compensation amount which are set in advance, and also on cutting points, a cutting surface perpendicular direction and a tool direction which are instructed by a processing program, and in which the respective axes are driven and controlled to positions of the respective control points thus determined, the method comprising the steps of: determining a cutting point position and a linear axis control point respectively at a start point and an end point for each of blocks thereof; and assuming that the linear axis control point at the end point of the current block is equal to the linear axis control point at the start point of the current block so that movement of the linear axis in accordance with the instructions in the current block does not occur, when judgment is made that a distance between the linear axis control points at the start point and the end point of the block is smaller than a predetermined second set value, and that a distance between the cutting point positions at the start point and the end point of the block is greater than a predetermined third set value, or when judgment is made that a ratio of the distance between the linear axis control points at the start point and the end point of the block to the distance between the cutting point positions at the start point and the end point of the block is less than a predetermined fourth set value.