Importance

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Abstract

A method for direct screwing, in particular flow hole screwing, includes producing a hole in a first stage in a structural component without cutting and forming a thread with a flow hole screw in a second stage. A feed and feed force are produced by a non-pneumatic feed drive and transmitted to a screw shaft rotated by high feed force and high rotational speed in the first stage and at a defined switchover point with penetration of the structural component a switchover is made to the second stage with lower feed force and slower rotational speed. A drive parameter correlated to the feed force, especially a motor current of an electric motor of the feed drive, is monitored and a characteristic change of this parameter is defined as switchover point. A rapid switchover with process stability is attained and damage to the flow hole screw thread is avoided.

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First Claim