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Tension rods in injection-molding machines

The tension rods in injection-molding machines are dynamically stressed by the periodic closing forces of the tool. In the application shown, failure occurred in the recesses for the screw threads. Deep rolling was able to move the service life into the realm of the fatigue strength. The process could be applied directly following cutting and in the same chucking.

Deep rolling a thread undercut with HG-tool
Festwalzen eines Gewindefreistichs mit HG-Werkzeug