CONTROL METHOD FOR MACHINE TOOL

摘要

In a control method for a machine tool including two or more translation axes and at least one rotation axis, a command for a distal end position of a tool and an attitude of the tool is provided to correct an error in the distal end position and the attitude with respect to a workpiece due to a geometric error to calculate a command value for controlling the translation axes. The method includes calculating the command value on the basis of a command coordinate value for the distal end position, a converted coordinate value obtained by converting a coordinate value of a rotation center point of the rotation axis in an actual state into a coordinate value without an error in inclination, and an axial unit vector for the ideal rotation axis.

主权项

1. A control method for a machine tool including two or more translation axes and at least one rotation axis, in which a command for a distal end position of a tool and an attitude of the tool is provided to correct an error in the distal end position and the attitude with respect to a workpiece due to a geometric error so that a command value for controlling the translation axes is calculated, the method comprising:
calculating the command value on the basis of:
a command coordinate value for the distal end position set in advance;a converted coordinate value obtained by converting a coordinate value of a rotation center point of the rotation axis in an actual state with the geometric error into a coordinate value without an error in inclination of the actual rotation axis with respect to the rotation axis in an ideal state without the geometric error, using a coordinate value of a correction reference point which is a point designated in advance in a machine coordinate system of the machine tool or a workpiece coordinate system; andan axial unit vector for the ideal rotation axis.