Method for controlling an intermittently operating screw tool

摘要

In the method for controlling an intermittent screw process first a torque mode (DMM) is applied in which the torque is continuously measured. Upon attainment of a pre-torque (M_F) a rotation angle mode (DWM) is carried out in which the rotation angle is measured. Proceeding from the rotation angle alpha=0 (corresponding to the pre-torque (M_F)) the rotation angle (alpha) is counted up during each stroke. In this connection that torque (M_HE) is stored which has been reached at the end of the stroke. During the next stroke the angle (alpha) is continued to be counted only when the torque (M_HE) at the stroke end of the previous stroke has been reached again. Upon attainment of a target angle (alpha_z) the screw process is terminated.