METHOD AND DEVICE FOR CORRECTING CUTTING EDGE OF TOOL IN NUMERICALLY CONTROLLED MACHINE TOOL

摘要

The present invention relates to a method and apparatus for correcting the cutting edge position of a tool installed on an NC lathe. The apparatus comprises a central processing unit for operating a basic processing program taking cutting edge position correction values; Judging means for judging whether the temperature of the main spindle table is in a normal state or an irregular state during tool change; Regular position correction means for detecting the amount of movement of the tool table required for the new tool to move the cutting edge into contact with the cutting edge detection sensor; Irregular position correction means for detecting an amount of movement of the tool table necessary to move the cutting edge of the tool at the end of its life to be in contact with the cutting edge detection sensor; And cutting force correction means for storing the dimensional change amount of the workpiece under processing as the cutting force correction value of the tool in the irregular state. The normal / non-normal position correction means stores the difference value between the movement amount including the cutting edge position correction value stored at the time of detection and the predetermined reference dimension as the normal / non-normal cutting edge position correction value for the new tool, respectively.