NUMERICAL CONTROL DEVICE

摘要

To execute machining for a front surface while rotating a work and, at the same time, apply machining to an eccentric position on an end face, according to an embodiment of the present invention, an NC device includes an arc-superimposition-interpolation control unit configured to rotate a work rotating shaft based on a command of a base axis program for controlling rotation of the work rotating shaft while performing front surface machining using a first cutter holder and, at the same time, subject a second cutter holder to position control on a second machining route obtained by superimposing the rotation of the work rotating shaft on a first machining route based on a command of a superimposition axis program for performing position control for the second cutter holder.

主权项

1. A numerical control device that controls a machine tool including: a work rotating shaft configured to rotate a work; a first cutter holder configured to machine a front surface of the work when the work is rotating; and a second cutter holder configured to be capable of moving on a surface having an axis direction of the work rotating shaft as a normal and machine the work from a side opposed to an end face of the work, the numerical control device comprising:
a machining-program storage region having stored therein a machining program including a first command for controlling the rotation of the work rotating shaft while performing front surface machining using the first cutter holder and a second command described using a relative coordinate with respect to the work and for performing position control on the second cutter holder; an arc-superimposition-interpolation control unit configured to rotate the work rotating shaft in accordance with the first command and, at the same time, subject the second cutter holder to the position control on a second machining route obtained by superimposing the rotation of the work rotating shaft on a first machining route in accordance with the second command, a maximum-speed calculating unit configured to calculate a maximum speed of the work rotating shaft such that speed of the second cutter holder moving on the second machining route does not exceed a maximum allowable speed set in advance; and a speed clamp unit configured to clamp rotating speed of the work rotating shaft with the maximum speed calculated by the maximum-speed calculating unit.