Title:
METHOD FOR THERMAL DISPLACEMENT CORRECTION IN MACHINE TOOL, AND THERMAL DISPLACEMENT CORRECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/024840
Kind Code:
A1
Abstract:
A numerical control device obtains the generated heat in a plurality of intervals into which a ball screw shaft is segmented, said obtainment being performed every 50 ms on the basis of control data and the rotation speed of an X-axis motor, and computes the temperature increase of a bearing holder every 50 ms. The temperature distribution of the plurality of intervals is computed every 6400 ms on the basis of an unsteady heat conduction equation that uses the temperature increase of the bearing holder and the total amount of generated heat that is 6400 ms of cumulative amounts of generated heat of the plurality of intervals. The magnitudes of thermal displacement of the plurality of intervals of the ball screw shaft are computed every 6400 ms on the basis of the temperature distribution. A compensation value is computed every 6400 ms for each compensation interval into which the net range of motion is segmented, said computation being performed on the basis of the magnitude of thermal displacement of the plurality of intervals.
More Like This:
Inventors:
KOBAYASHI HARUO (JP)
KURAHASHI HAJIME (JP)
KURAHASHI HAJIME (JP)
Application Number:
PCT/JP2010/064346
Publication Date:
March 03, 2011
Filing Date:
August 25, 2010
Export Citation:
Assignee:
BROTHER IND LTD (JP)
KOBAYASHI HARUO (JP)
KURAHASHI HAJIME (JP)
KOBAYASHI HARUO (JP)
KURAHASHI HAJIME (JP)
International Classes:
B23Q15/18; G05B19/404
Foreign References:
| JP2002018677A | 2002-01-22 | |||
| JP2007021721A | 2007-02-01 | |||
| JP2004042260A | 2004-02-12 | |||
| JP2010234500A | 2010-10-21 |
Attorney, Agent or Firm:
YAMAMOTO, HISASHI (JP)
Yamamoto In addition (JP)
Yamamoto In addition (JP)
Download PDF: