Mechanical and technological study of the cold form tapping process applied to hardened steel

Abstract : Threaded assembly is much used solution for engineering design and most of internal threads are obtained by a tapping process. Form tapping is an alternative to cut tapping. The technique of form tapping creates the thread by work material displacement and without chip. The characteristics of formed thread are quite different from those obtained by cut tapping. The study deals with form tapping applied to treated steels and also with the threaded holes produced. The thread formation is a key point of the process investigations. It is a three-dimensional plastic flow. The forming of the thread leads to strain hardening of the work material, which is involved in the tap wear. An analysis of the displacement, strain and stress field is proposed. The tool material, tapped material and the fluid significantly influence the plastic flow. The formed threads have superior geometric qualities as compared to those of the threads made by cut tapping. Furthermore, the tensile strength of thread formed in low carbon steel, under static test, is also greater due to the reinforcement of the work material by strain hardening.
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Submitted on : Thursday, June 29, 2006 - 8:00:00 AM
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Guillaume Fromentin. Mechanical and technological study of the cold form tapping process applied to hardened steel. Engineering Sciences [physics]. Arts et Métiers ParisTech, 2004. English. ⟨NNT : 2004ENAM0018⟩. ⟨pastel-00000941⟩

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