Method of controlling lifetime of complex tool

Abstract

In a complex tool 21 capable of performing turning machining and milling machining by using a single or simultaneously using a plurality of inserts 22, 23, 25, 26, expiration of lifetime of the complex tool is judged by integrating machining time element UT, LN every insert, and when expiration of lifetime of at least one insert is judged, judgement is performed in such a manner that the complex tool installing the insert thereon, which expiration of lifetime is judged, reaches expiration of lifetime. When only one insert reaches expiration of lifetime, the machining with the complex tool can be immediately stopped. Then, a lowering of machining accuracy by continuing to use the insert which reaches expiration of lifetime can be avoided. Since the machining time element is integrated every insert, the inserts which reaches expiration of lifetime and others of the same complex tool can be clearly differentiated from one another.

Dependencies are inferred from the claim text.