Title:
TWO SPINDLE COUNTER LATHE WITH TORSIONAL STRAIN COMPENSATION MEANS
Document Type and Number:
Japanese Patent JP2016117130
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To prevent a decrease of machining accuracy due to release of torsional strain of a workpiece with both ends held and machined by a two spindle counter lathe, without causing loss of a machining time by the rotation stop of a spindle and an increase of consumption power in the acceleration/deceleration.SOLUTION: Torsional strain compensation means is provided for adding a complemented value of the direction of eliminating the torque difference to a command signal (angle command) of a rotational speed or a rotation angle provided in at least one of the spindle motors so that a difference of load torque of two spindle motors may be maintained in a set limit value or less. The load torque can be detected by a difference between a current value or an angle value given to the motors and a feedback signal. The torsional strain compensation means outputs a compensation signal on the basis of these differences.SELECTED DRAWING: Figure 1
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| JP7322603 | Machine Tools |
| JPH03270803 | SPINDLE CONTROL METHOD ON OPPOSED SPINDLE LATHE |
Inventors:
KAKUMOTO MASAHIKO
Application Number:
JP2014258453A
Publication Date:
June 30, 2016
Filing Date:
December 22, 2014
Export Citation:
Assignee:
NAKAMURA TOME PRECISION IND
International Classes:
B23B3/30; B23B1/00
Domestic Patent References:
| JPH02279253A | 1990-11-15 | |||
| JP2004195616A | 2004-07-15 | |||
| JPH02290187A | 1990-11-30 | |||
| JPH0241694A | 1990-02-09 |
Foreign References:
| US5047702A | 1991-09-10 | |||
| DE68925421C |
Attorney, Agent or Firm:
Takao Nishi