Numerical control device

Abstract

The present invention addresses the problem of avoiding uncut portions of a workpiece and interference between a workpiece and a tool attributed to an incorrect movement direction or movement amount of the rotational axis, without changing a program. The numerical control device according to the present invention is a numerical control device for a machine tool that implements machining while changing the relative position and relative orientation between a tool and a workpiece on the basis of a program, the numerical control device comprising: a contour shape generation unit that generates contour shape information pertaining to the contour shape of the workpiece on the basis of relative movement information between the tool and the workpiece described in the program; a relative orientation determination unit that determines a relative orientation of the tool in relation to the workpiece at a change point included in the contour shape information; and a relative orientation change direction determination unit that determines, according to the type of the contour shape, a change direction for the relative orientation in order to obtain the determined relative orientation.

Dependencies are inferred from the claim text.