Patent ID: 8265783
Filing Date: 2012-09-11
Classification: G05B

Abstract:
1. A method for creating profile data to process a non-circular workpiece, the profile data indicating a relationship between a spindle rotation angle and a tool reciprocation position, the spindle rotation angle being a rotation angle of a spindle that causes rotation of the non-circular workpiece about a rotation axis of the non-circular workpiece, when the non-circular workpiece is ground by a tool that reciprocates with respect to the non-circular workpiece in a direction which intersects with the rotation axis of the non-circular workpiece in synchronization with the rotation of the non-circular workpiece, the tool reciprocation position being a position of the tool in the direction which intersects with the rotation axis of the non-circular workpiece and corresponds to the spindle rotation angle, the method comprising: reading lift data in which a lift amount is set based on a lift data rotation angle, the lift data rotation angle being a rotation angle of the non-circular workpiece when the non-circular workpiece is rotated about the rotation axis of the non-circular workpiece, in order to identify a shape of the non-circular workpiece; calculating a profile point group formed of a plurality of profile points each of which indicates the tool reciprocation position that corresponds to the spindle rotation angle based on the read lift data; dividing the calculated profile point group into a plurality of groups each of which is formed of profile points that are within a range of the spindle rotation angle up to a spindle rotation angle at which a manner in which the spindle rotation angle is changed is reversed; selecting two groups, from among the plurality of groups, that satisfy a group comparison condition set in advance; and deleting the profile point that satisfies a specific point deletion condition which is set in advance for a combination of the selected two groups.