US 12,202,049 B2
Machine tool and detection method
Atsushi Inoue, Tokorozawa (JP); Masahiro Muramatsu, Nishitokyo (JP); Kenji Noguchi, Sayama (JP); and Kohichi Kazahari, Higashikurume (JP)
Assigned to CITIZEN WATCH CO., LTD., Nishitokyo (JP)
Appl. No. 17/594,262
Filed by CITIZEN WATCH CO., LTD., Nishitokyo (JP)
PCT Filed Mar. 30, 2020, PCT No. PCT/JP2020/014669
§ 371(c)(1), (2) Date Oct. 8, 2021,
PCT Pub. No. WO2020/209134, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 2019-075849 (JP), filed on Apr. 11, 2019.
Prior Publication US 2022/0161333 A1, May 26, 2022
Int. Cl. B23B 25/06 (2006.01); B23Q 17/00 (2006.01); B23Q 17/12 (2006.01); B23B 3/30 (2006.01); B23B 13/04 (2006.01)
CPC B23B 25/06 (2013.01) [B23Q 17/002 (2013.01); B23Q 17/12 (2013.01); B23B 3/30 (2013.01); B23B 13/04 (2013.01); B23B 2260/1285 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A machine tool comprising:
a first spindle having a first chuck;
a second spindle having a second chuck;
a controller configured to cause the second chuck to perform a fastening operation for fastening a work fastened to the first chuck to the second chuck; and
a detector configured to detect an abnormality caused by the fastening operation by the second chuck, based on measurement data associated with a vibration of at least one of the first chuck and the second chuck.