Thread forming screws demonstrate performance
An
Arnold Umformtechnik product story
Edited by the Engineeringtalk editorial team
Mar 14, 2007
Working jointly with Magna Powertrain, Arnold Umformtechnik has carried out a comprehensive study aimed at measuring the requirements of thread-forming screws combined with aluminium alloys.
Working jointly with Magna Powertrain, Arnold Umformtechnik has carried out a comprehensive study aimed at measuring the requirements of thread-forming screws combined with aluminium alloys.
The manufacturer of distributor gear units has proved the capability of this screw profile in the form of Arnold's cost-busting Taptite 2000 when used in light-metal gear housings.
The results of the study confirm the trend that thread-forming versions will soon be strong challengers to their metric equivalents.
The comprehensive screw-in tests demonstrably indicate a relatively even pre-tensioning force window for both initial and repeat screw fastenings.
Even at maximum core hole tolerance the method achieves acceptable breakaway moments.
Despite widely varying temperatures the fall in pre-tensioning force on the distributor gear unit housing remains at a low level.
The triangular profile of the Taptite 2000 reduces tapping torque to a reliable 12 Newtonmeter.
According to the two people who conducted the study, Christian Hinteregger of Magna Powertrain, and Thomas Jakob of Arnold, optimised aluminium alloys -such as GD-AISi9Cu3 -provide an excellent thread-forming structure, which, together with the triangular shaft cross-section of the Taptite system, creates low tapping torques and high overtorques.
The separation achieved between these two parameters ensures high and lightly dispersed pre-tensioning forces.
The study shows that in the distributor gear unit application in question, a thread-forming Taptite 2000 screw can replace a metric screw without problem.
And when it comes to assembling gear units and engines, the Taptite 2000 screw plays a full part in providing processing and cost benefits.
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