Screw Fastening Plastic Components
The increasing use of thermoplastics, mainly in the automotive industry requires the improvement of mechanical joining processes, such as direct screw fastening, for the production of assemblies. Arnold Umformtechnik GmbH & Co. KG, Forchtenberg, Germany, has developed the Remform screw for direct screw fastening of thermoplastics. It can not only save costs but also shorten assembly times and increase process reliability. The screw has an asymmetric thread geometry, with the thread flank facing away from the screw head being provided with a radius to improve the material flow. This leads to better guidance of the plastic at lower thread torques. The steep load flank facing the screw head intercepts the unformed plastic, ensuring high pull-out forces.
In addition, the large difference between the thread torque and the overtwisting torque offers high reliability of installation. In comparison to a 30-degree flank angle screw, the Remform screw has a higher core diameter, so that the screw shows higher breaking torques – an advantage in the screw fastening of high performance plastics.
Since the screw independently cuts its own thread into an existing core hole, this eliminates additional material costs for, e. g., nuts and inserts and for other costly and time-consuming processes for preparing the fastening point. In addition, high screw insertion rates and therefore short cycle times can be achieved.
Hall 7.2, booth E21
Arnold Umformtechnik GmbH & Co. KG
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