Control device for machine tool and machine tool

Patent metadata

Field	Value
Publication number	US-12090596-B2
Application number	US-201917291414-A
Country	US
Kind code	B2
Filing date	Dec 27, 2019
Priority date	Jan 10, 2019
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

A control device for a machine tool comprises a control section controlling the relative rotation and feeding of a cutting tool and a material, performing cutting with vibration of the cutting tool relative to the material by combining a forward feed movement in the machining direction, and a return movement in the counter-machining direction. A return movement setting section sets a pulse-like signal including a command for moving a cutting tool in the machining direction and a command for the return movement. A forward feed setting section makes the cutting tool reach a change point by combining the movement in the machining direction on the basis of the return movement setting section and the forward feed movement. A pulse-like signal is formed in sine waveform with an inflection point, and a phase of the inflection point is set to a value different from a phase of the change point.

First claim

The invention claimed is:

1. A controller for a machine tool having a feeder relatively moving a cutting tool and a material, and having a motor relatively rotating at least one of the cutting tool and the material with respect one another,
the controller configured to:
control an operation of the feeder and the motor while vibrating the cutting tool relative to the material by combining a forward feed movement in a machining direction, in which the cutting tool machines the material, and a return movement in a counter-machining direction different from the machining direction,

wherein the controller is further configured to:
calculate a return position of the cutting tool at a time when one vibration is completed using a number of vibrations and an amount of feed that are predetermined for one rotation of the cutting tool or the material as parameters; and
output a pulse signal that includes a command for moving the cutting tool to a change point from the machining direction to the counter-machining direction, and a command for moving the cutting tool from the change point to the return position in the counter-machining direction, and

wherein the pulse signal is formed in a sine waveform with an inflection point, and a phase of the inflection point for making the cutting tool reach the change point is set to a value different from a phase of the change point.

2. The controller according to claim 1 , wherein the number of vibrations is one or more.

3. The controller according to claim 1 , wherein the number of vibrations is less than one.

4. A machine tool comprising the controller according to claim 1 .

5. A machine tool comprising the controller according to claim 2 .

6. A machine tool comprising the controller according to claim 3 .

Assignees

• Citizen Watch Co Ltd
• Citizen Machinery Co Ltd

Inventors

• Sannomiya Kazuhiko
• Nakaya Takaichi

Classifications

• B23B1/00

  Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods · CPC title

• B23Q15/013

  Control or regulation of feed movement (B23Q15/12 takes precedence) · CPC title

• G05B2219/49384

  Control of oscillatory movement like filling a weld, weaving · CPC title

• G05B19/19

  characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path · CPC title

• B23Q5/58 Primary

  Safety devices {(protecting the operator B23Q11/0089)} · CPC title