Method for machining workpiece

A method for machining a workpiece by moving a working tool and the workpiece relative to each other, said method comprising steps of:

• generating a positional command based on a predetermined NC machining program;
• carrying out the machining operation for the workpiece in accordance with the generated positional command;
• sequentially estimating a wear amount of the working tool during the machining of the workpiece;
• sequentially correcting the tool edge position of the working tool so as to compensate for the estimated wear amount of the working tool;
• interrupting the machining operation for the workpiece;
• detecting the wear amount of the working tool upon the interruption of the machining operation for the workpiece:
• accumulating a difference between the detected wear amount of the working tool and the estimated wear amount of the working tool;
• and
• correcting a tool edge position of the working tool upon the restart of the machining operation to coincide with the tool edge position of the working tool upon the interruption of the machining operation for the workpiece, based on the accumulated wear amount of the working tool, and restarting the machining operation for the workpiece from the set tool edge position of the working tool.

A machine tool for machining a workpiece by moving a working tool and the workpiece relative to each other, said machine tool having a function for correcting the wear of the working tool, said machine tool comprising:

• a positional command generating means for generating a positional command based on a predetermined NC machining program and moving the working tool and the workpiece relative to each other in accordance with the generated positional command;
• a tool wear amount detection means for detecting a wear amount of the working tool upon the interruption of the machining operation for the workpiece;
• and
• a tool edge position control means for correcting a tool edge position of the working tool upon the restart of the machining operation for the workpiece to coincide with the tool edge position of the working tool upon the interruption of the machining operation for the workpiece, based on the wear amount of the working tool detected by said tool wear amount detection means.

A machine tool for machining a workpiece by moving a working tool and the workpiece relative to each other, said machine tool having a function for correcting the wear of the working tool, said machine tool comprising:

• a positional command generating means for generating a positional command based on a predetermined NC machining program and moving the working tool and the workpiece relative to each other in accordance with the generated positional command;
• a tool wear amount detection means for detecting a wear amount of the working tool upon the interruption of the maching operation for the workpiece;
• a tool wear amount estimation means for sequentially estimating a wear amount of the working tool during the machining of the workpiece:
• a tool edge position correction means for sequentially correcting the tool edge position of the working tool so as to compensate for the wear amount of the working tool estimated by said tool wear amount estimation means;
• a wear amount accumulation means for accumulating a difference between the detected wear amount of the working tool and the estimated wear amount of the working tool;
• and
• a tool edge position control means for correcting a tool edge position of the working tool upon the restart of the machining operation for the workpiece to coincide with the tool edge position of the work tool upon the interruption of the machining operation for the workpiece, based on the accumulated wear amount of the working tool.