Title:
LATHE
Document Type and Number:
WIPO Patent Application WO/2020/110573
Kind Code:
A1
Abstract:
Provided is a lathe whereby a product having enhanced dimensional accuracy can be obtained. This lathe 1 comprises a first headstock (11), a second headstock (21), a servo device (MZ2) for causing the second headstock (21) to move in the center axis direction of a second main shaft (22), and a control part U1 for controlling the opening/closing action of gripping parts 13, 23 and the movement of the second headstock (21) caused via the servo device (MZ2). The control part U1 opens a second gripping part 23 and causes the second headstock (21) to move toward the first headstock (11) in a state in which the servo device (MZ2) is limited to a torque lower than the maximum torque, imparts a predetermined torque fluctuation to the servo device (MZ2) and detects a change (∆Zi) in the position of the second headstock (21) in the center axis direction of the second main shaft, and determines whether a foreign body 800 is present between the second gripping part 23 and a work piece W0 on the basis of the change (∆Zi) in position detected in the range in which the second gripping part 23 grips the work piece W0.
Inventors:
KAKU NORIO (JP)
Application Number:
PCT/JP2019/042463
Publication Date:
June 04, 2020
Filing Date:
October 30, 2019
Export Citation:
Assignee:
STAR MFG CO (JP)
International Classes:
B23B3/30; B23B25/06; B23Q11/00; B23Q17/00; G05B19/18
Foreign References:
| JPH09277136A | 1997-10-28 | |||
| JPH02218537A | 1990-08-31 | |||
| JPH03190601A | 1991-08-20 | |||
| JP2017131982A | 2017-08-03 | |||
| JPH0335902A | 1991-02-15 | |||
| JPH0796402A | 1995-04-11 | |||
| JPH05245740A | 1993-09-24 | |||
| JPH05111802A | 1993-05-07 | |||
| JP2015057308A | 2015-03-26 |
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