CONTROL SYSTEM OF MACHINE TOOL

摘要

A control system of a machine tool with a rotary type spindle and a feed axis which generates feed motion of the spindle, comprising a current detecting part which detects a current through a spindle motor for driving the spindle, a temperature detecting part which detects a motor temperature, a remaining time estimating part which uses a predetermined maximum allowable temperature and a detected temperature value by the temperature detecting part as the basis to estimate a remaining time until the motor temperature would reach the maximum allowable temperature on the assumption that the detected current value by the current detecting part at the time of the detected temperature value would continue to flow through the spindle motor, and a feed speed changing part which changes speed of the feed motion in accordance with the estimated value of the remaining time.

主权项

1. A control system of a machine tool with a rotary type spindle and a feed axis which generates feed motion of said spindle with respect to a workpiece, comprising
a current detecting part which detects a current which flows through a spindle motor which drives said spindle, a temperature detecting part which detects a temperature of said spindle motor, a remaining time estimating part which uses a predetermined maximum allowable temperature of said spindle motor and a detected temperature value by said temperature detecting part as the basis to estimate a remaining time until the temperature of said spindle motor reaches said maximum allowable temperature on the assumption that where the detected current value by said current detecting part at the time of the detected temperature value would continue to flow through said spindle motor, and a feed speed changing part which changes speed of said feed motion in accordance with the estimated value of said remaining time by the remaining time estimating part.