NUMERICAL CONTROL DEVICE OF MACHINE TOOL

摘要

A numerical control device comprising an acceleration/deceleration characteristic acquisition part which acquires predetermined acceleration/deceleration characteristic information showing a correspondence between a command speed and a maximum acceleration of a spindle, a rotation amount acquisition part which acquires predetermined rotation amount information showing the rotation amount of the spindle for a period from when feed operation of the spindle is started to when a tapping tool reaches a bottom of the hole of a workpiece, a machining time calculation part which calculates a correspondence between the command speed and a machining time required to reach the rotation amount, based on the acceleration/deceleration characteristic information and the rotation amount information, and a speed determination part which determines an optimum value of the command speed for minimizing the machining time, based on the correspondence calculated by the machining time calculation part.

主权项

1. A numerical control device of a machine tool which perform tapping process on a workpiece, using a spindle to which a tapping tool is attached, and a feed shaft for feed operation of said spindle, comprising:
an acceleration/deceleration characteristic acquisition part which acquires predetermined acceleration/deceleration characteristic information showing a correspondence between a command rotational speed of the spindle and a maximum possible acceleration of the spindle, a rotation amount acquisition part which acquires predetermined rotation amount information which shows the rotation amount of the spindle for a period from when the feed operation of the spindle is started to when the tapping tool reaches a bottom of the hole of the workpiece, a machining time calculation part which calculates a correspondence between the command rotational speed of the spindle and a machining time required for the spindle to reach the rotation amount, based on the acceleration/deceleration characteristic information and the rotation amount information, and a speed determination part which determines an optimum value of the command rotational speed of the spindle for minimizing the machining time, based on the correspondence calculated by the machining time calculation part.