CONTROLLING METHOD OF TOOL LIFE IN NUMERICALLY CONTROLLED MACHINE TOOL

摘要

PURPOSE:To facilitate the tool change operation by a method wherein the ratio of time used heretofore to its life-time is displayed by being classified in colors so as to be instantaneously recognizable in the method to control the tool life of the numerically controlled machine tool by displaying it on a cathode ray tube. CONSTITUTION:The numbers of the tools 1, 2, 3 and 4 and cumulative times used heretofore for cutting of the respective tools and the life-time of every said tool are displayed on the cathode ray tube. Indicated colors of these informations are classified by green, yellow and red. Green indicates that the cumulation of time used of a tool is less than 90% of its life-time and subject tool can be used in cutting for enough longer time, yellow indicates that the time used of a tool exceeds 90% of its life-time and the preparation of stand-by tool is demanded and red indicates that the time used of a tool exceeds its life-time and the warning for tool exchange is represented.