Numerical control device, machining system simulator, and numerical control program

A machining system simulator for simulating an operation of a machining system including a machine tool that includes at least one tool rotation axis for changing an angle of a multi-edge tool having a plurality of machining edges capable of machining a workpiece and at least one drive axis for relative movement of the workpiece and the multi-edge tool, the machine tool performing switching of the machining edge in use for machining the workpiece to the machining edge used next by rotating about the tool rotation axis, and a numerical controller for controlling the machine tool according to a machining program, the machining system simulator comprising:

• an edge shape information storage unit that stores geometric information of each of the machining edges of the multi-edge tool as edge shape information;
• a center point calculation unit that reads a tip point of the machining edge used and an axial angle of the tool rotation axis from the machining program to calculate a center point of rotation of the multi-edge tool based on the read tip point and axial angle and the edge shape information stored in the edge shape information storage unit;
• an edge switching determination unit that determines whether the switching of the machining edge is requested based on the machining program;
• a calculation method changing unit that changes, when the edge switching determination unit determines that the switching of the machining edge is requested, a method of calculation of the center point by the center point calculation unit with the switching of the machining edge taking the edge shape information into account;
• a tip point back calculation unit that back-calculates the tip point of the machining edge used after the switching from the center point just before the switching of the machining edge based on the method of calculation changed by the calculation method changing unit with the switching of the machining edge;
• and
• a change amount calculation unit that calculates a required amount of change of the center point based on the tip point of the machining edge and the axial angle after the switching calculated by the tip point back calculation unit and the tip point of the machining edge and the axial angle before the switching.

A non-transitory storage medium which non-transitorily stores a numerical control program for controlling processing of a numerical controller that controls, according to a machining program, a machine tool that includes at least one tool rotation axis for changing an angle of a multi-edge tool having a plurality of machining edges capable of machining a workpiece and at least one drive axis for relative movement of the workpiece and the multi-edge tool, the machine tool performing switching of the machining edge in use for machining the workpiece to the machining edge used next by rotating about the tool rotation axis, the numerical control program comprising:

• a center point calculation control unit that reads a tip point of the machining edge used and an axial angle of the tool rotation axis from the machining program to calculate a center point of rotation of the multi-edge tool based on the read tip point and axial angle and edge shape information including geometric information of each of the machining edges of the multi-edge tool;
• an edge switching determination control unit that determines whether the switching of the machining edge is requested based on the machining program;
• a calculation method change control unit that changes, when the edge switching determination control unit determines that the switching of the machining edge is requested, a method of calculation of the center point by the center point calculation control unit with the switching of the machining edge taking the edge shape information into account;
• a tip point back calculation control unit that back-calculates the tip point of the machining edge used after the switching from the center point just before the switching of the machining edge based on the method of calculation changed by the calculation method change control unit with the switching of the machining edge;
• and
• a change amount calculation control unit that calculates a required amount of change of the center point based on the tip point of the machining edge and the axial angle after the switching calculated by the tip point back calculation control unit and the tip point of the machining edge and the axial angle before the switching.