Method and apparatus for correcting cutting edge position of tool in NC lathe

摘要

The present invention relates to a method and apparatus for calibrating a cutting edge position of a tool installed on an NC lathe. The apparatus includes a central processing unit for operating a basic processing program that takes a cutting edge position correction value; Judging means for judging whether the temperature of the main spindle table is in a normal state or an irregular state at the time of tool change; Normal position correcting means for detecting an amount of movement of the tool table necessary to move the cutting edge of the new tool in contact with the cutting edge detecting sensor; An irregular position correcting means for detecting an amount of movement of the tool table necessary to move the cutting edge of the tool having a shortened service life in contact with the cutting edge detecting sensor; And a cutting force correction means for storing the dimensional change amount of the workpiece being machined as the cutting force correction value of the tool in the non-normal state. The normal / irregular position correcting means stores the difference value between the movement amount including the cutting edge position correction value memorized at the detection time point and the predetermined reference dimension as the normal / irregular cutting edge position correction value for the new tool, respectively.