Machine-tool spindle cooling method and machine tool

Patent metadata

Field	Value
Publication number	US-10766112-B2
Application number	US-201615556479-A
Country	US
Kind code	B2
Filing date	Mar 10, 2016
Priority date	Mar 10, 2015
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

An object is to provide a machine-tool spindle cooling method and a machine tool capable of suppressing thermal deformation of a spindle while achieving energy saving. To achieve it, a machine-tool spindle cooling method is provided in which bearings ( 13 ) and a spindle rotation motor ( 14 ) that generate heat with rotation of a spindle ( 12 ) are cooled by causing a spindle cooling device ( 18 ) to supply and circulate cooled cooling oil inside a housing ( 11 ) rotatably supporting the spindle ( 12 ), the method comprising deactuating the spindle cooling device ( 18 ) to thereby stop supplying the cooling oil in a case where the number of revolutions of the spindle ( 12 ) is less than or equal to a predetermined number of revolutions and the temperatures of the bearings ( 13 ) and the spindle rotation motor ( 14 ) detected by temperature sensors ( 15, 16 ) are less than or equal to a predetermined temperature.

First claim

The invention claimed is:

1. A machine-tool spindle cooling method in which a heat source that generates heat with rotation of a spindle is cooled by causing a spindle cooling device to supply and circulate a liquid inside a housing rotatably supporting the spindle, the method comprising:
deactuating all motors in the spindle cooling device to thereby stop supplying and circulating the liquid in a case where a number of revolutions of the spindle is less than or equal to a predetermined number of revolutions and a temperature of the heat source detected by a temperature sensor is less than or equal to a predetermined temperature.

2. The machine-tool spindle cooling method according to claim 1 , wherein switching of the spindle cooling device between an actuated state and a deactuated state is not performed until a certain period of time elapses after switching to the actuated state or the deactuated state.

3. A machine tool comprising:
a spindle rotatably supported inside a housing through a plurality of bearings;
a spindle rotation motor that rotates the spindle;
a spindle cooling device that cools the bearings and the spindle rotation motor generating heat with rotation of the spindle, by supplying and circulating liquid inside the housing;
a temperature sensor that detects at least one temperature among a temperature of the bearings and a temperature of the spindle rotation motor; and
a control device that deactuates all motors in the spindle cooling device so as to not supply and circulate the liquid in a case where a number of revolutions of the spindle is less than or equal to a predetermined number of revolutions and the at least one temperature detected by the temperature sensor is less than or equal to a predetermined temperature.

Assignees

• Mitsubishi Heavy Ind Machine Tool Co Ltd

Inventors

• Nakamura Shingo

Classifications

• B23Q2220/006

  Spindle heads · CPC title

• B23Q11/127 Primary

  for cooling motors or spindles · CPC title

• B23Q5/10

  driven essentially by electrical means · CPC title