Thread Forming In Magnesium Alloys

Biermann, D.^{1, a}; Pantke, K.^{1, b}

1)

Institut für Spanende Fertigung, Technische Universität Dortmund, Baroper Str. 301, 44227 Dortmund

a) biermann@isf.de; b) pantke@isf.de

Kurzfassung

With cold forming tapping tools, it is possible to produce internal threads by cold forming. Due to this, thread strength could be significantly enhanced. The core requirement for cold forming is the adequate plasticity of the workpiece material. Insufficient plasticity of magnesium alloys limits cold tap forming. A new process of pre-forming tap offers a good opportunity to handle the described problem. To implement this, threads are produced in a two-stage operation. In the first step, an incomplete thread will be generated (machined) by a modified thread tool. The diameter of this tap is slightly less than the normal tap. In the second step, a cold forming tap is finishes the thread to final diameter. Through this procedure it is possible to increase thread strength up to 40 percent. This article will address the microstructure influence of thread forming in magnesium alloys and the resulting thread strength.

Schlüsselwörter

Magnesium, Tapping, Production process

Veröffentlichung

In: Proceedings of the TMS 2008, 137th Annual Meeting and Exhibition, 9.6.-13.6. 2008, New Orleans, USA, Pekguleryuz; Neelameggham; et al (Hrsg.), ISBN 978-0-87339-711-7, S. 393-397