Data processing: generic control systems or specific application – Specific application – apparatus or process – Product assembly or manufacturing
Patent
1997-11-03
2000-11-07
Grant, William
Data processing: generic control systems or specific application
Specific application, apparatus or process
Product assembly or manufacturing
81467, G06F 1900
Patent
active
061448915
ABSTRACT:
An elevator carrying a motor for rotating a socket wrench is lowered by a hydraulic cylinder while being guided by a linear guide, such that the socket wrench is rotated by the motor while the socket wrench is in engagement with the head of a bolt, with a compressive force being applied to the bolt based on a hydraulic pressure of the cylinder, and such that a wrenching torque and the compressive force acting on the bolt is detected by a detector. A coefficient of friction between thread surfaces of the bolt and an internal thread is evaluated based on the wrenching torque in an initial stage of wrenching operation in which the bolt head is spaced apart from a workpiece, while a coefficient of friction between the bolt head and the workpiece is evaluated based on the wrenching torque in an intermediate stage in which the thread surfaces of the bolt and the internal thread are spaced apart from each other immediately after contacting of the bolt head and the workpiece. The wrenching operation is terminated when actual wrenching torque reaches a target wrenching torque determined from the friction coefficients.
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Mori Kazuya
Murakami Yukitaka
Central Motor Wheel Co., Ltd.
Grant William
Rapp Chad
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