Numerical control device and numerical control method for controlling movement of processing tool that applies internal surface processing to recessed part formed in advance in workpiece

A numerical control device that controls movement of a processing tool which applies internal surface processing to a recessed part formed in advance in a workpiece, the numerical control device comprising:

• a main control unit that gives a processing command to a processing device on a basis of a processing program;
• a processing program reading unit that pre-reads the processing program;
• and
• a tool moving path setting unit that sets a moving path to be taken by the processing tool upon completion of the internal surface processing, wherein
• the tool moving path setting unit includes:
• a tool retreat position setting unit that sets a retreat position with respect to the recessed part to be assumed by the processing tool upon completion of the internal surface processing, on a basis of the pre-read processing program;
• a cutting edge stop angle setting unit that sets a stop angle to be formed upon completion of the internal surface processing by a cutting edge attached to the processing tool, on a basis of a moving direction in which the processing tool is to move from the retreat position;
• and
• a tool retreat path setting unit that sets a retreat path from the stop position to the retreat position to be taken by the processing tool upon completion of the internal surface processing, and
• the stop angle is set in such a manner that a pointing direction of a tip of the cutting edge falls within a stop range defined so as not to have a moving vector component oriented in a same direction as the moving direction.