Title:
BOLT FASTENING METHOD AND DEVICE
Document Type and Number:
Japanese Patent JP3835374
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To accurately fasten a bolt by setting a fastening amount of the bolt to an appropriate value.
SOLUTION: When fastening the bolt using a bolt fastening means 6, a first and a second torque gradient calculation means 14 and 15 detect fastening torque for every prescribed fastening angle interval of the bolt and calculate the torque gradient formed of a ratio of the fastening torque to the fastening angle of the bolt and, after adding and averaging the calculation values of the respective torque gradients, a fastening amount control means 16 controls the fastening amount of the bolt based on the adding and averaging value of the torque gradient.
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Inventors:
Makimae Tatsumi
Yutaka Fujii
Hiroshi Shinagawa
Yutaka Fujii
Hiroshi Shinagawa
Application Number:
JP2002234044A
Publication Date:
October 18, 2006
Filing Date:
August 09, 2002
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
B25B23/14; B23P19/06; F16B31/02; (IPC1-7): B25B23/14; F16B31/02
Domestic Patent References:
| JP457680A | ||||
| JP241830A | ||||
| JP7256566A |
Attorney, Agent or Firm:
Etsushi Kotani
Kyuichi Ueki
Jiro Higuchi
Kyuichi Ueki
Jiro Higuchi