Locking procedure for screw driven by automatic tool used in motor vehicle assembly includes initial, final locking and validation stages

摘要

The procedure consists of an initial pre-locking stage in which an automatic tool turns the screw to a pre-set torque, a second locking stage that turns the screw to a final locking torque with account given to a signal representing the angle of rotation, and a validation stage in which the angle of rotation is compared with a predetermined angle. In addition, warning signals are given when the angle of rotation is greater than the predetermined angle.