Wire electric discharge machine performing turning tool machining, turning tool machining method with wire electric discharge machine, and program creation apparatus for wire electric discharge machine that performs turning tool machining

A turning tool machining method by a wire electric discharge machine that performs machining of an edge part of the turning tool to which a tip is attached by moving a wire electrode relative to a table on which the turning tool is placed, in accordance with a machining program, the turning tool machining method comprising the steps of:

• measuring a height from a reference face on a plurality of points on a route of the machining program;
• calculating a height error of a surface of the tip with respect to a reference rake face having no tip-attaching error, on the basis of the height that is measured;
• calculating a correction amount on each measurement point on the basis of the error on each measurement point that is calculated and a taper angle of the wire electrode in performance of machining that is instructed by the machining program, so that a position, on a horizontal plane, of the edge part of the turning tool accords with a position, on the horizontal plane, of an edge part of the reference rake face;
• and
• controlling relative positions of the wire electrode and the turning tool on the basis of the correction amount that is calculated.

A program creation apparatus for a wire electric discharge machine that performs turning tool machining, the program creation apparatus creating a program for machining an edge part of the turning tool and comprising:

• a machining route creation unit configured to create a machining route with respect to a reference rake face having no error;
• an input unit configured to input a result that is obtained by measuring a height from a reference face on a plurality of points on the machining route;
• an error calculation unit configured to calculate a height error of a tip surface with respect to the reference rake face having no tip-attaching error, on the basis of the inputted value;
• a correction amount calculation unit configured to calculate a correction amount on each measurement point on the basis of the error on each measurement point that is calculated and an angle formed by a rake face and a flank face of the turning tool that is determined in design, so that a position, on a horizontal plane, of the edge part of the turning tool accords with a position, on the horizontal plane, of an edge part on the reference rake face;
• a machining route calculation unit configured to calculate a new machining route that is obtained by correcting the machining route on the basis of the correction amount that is calculated;
• and
• a machining program creation unit configured to create a machining program with respect to the new machining route that is calculated.

A program creation apparatus for a wire electric discharge machine that performs turning tool machining, the program creation apparatus creating a program for machining an edge part of the turning tool and comprising:

• a storage unit configured to store the machining program for machining a turning tool;
• an input unit configured to input a result that is obtained by measuring a height from a reference face on a plurality of points on a route of the machining program;
• an error calculation unit configured to calculate a height error of a tip surface with respect to a reference rake face having no tip-attaching error, on the basis of the inputted value;
• a correction amount calculation unit configured to calculate a correction amount on each measurement point on the basis of the error on each measurement point that is calculated and an angle formed by a rake face and a flank face of the turning tool that is determined in design, so that a position, on a horizontal plane, of the edge part of the turning tool accords with a position, on the horizontal plane, of an edge part on the reference rake face;
• and
• a machining program creation unit configured to create a new machining program that is obtained by correcting the machining program on the basis of the correction amount that is calculated.