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Precision and surface integrity of threads obtained by form tapping

Article dans une revue avec comité de lecture
Author
ccFROMENTIN, Guillaume
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
POULACHON, Gerard
MOISAN, Alphonse
JULIEN, Benoit
7736 PSA Peugeot - Citroën [PSA]
GIESSLER, Joseph

URI
http://hdl.handle.net/10985/7468
Date
2006
Journal
CIRP Annals - Manufacturing Technology

Abstract

Largely applied to internal threading of extruded tubes, cold form tapping is now becoming a promising process for internal threading of holes in non ferrous and ferrous solid components, more particularly for mass production in the automotive industry. The aim of this study is to present the surface properties of the threads resulting from form tapping. Geometrical characterization, surface texture, mechanical and metallurgical observations are investigated. The results obtained are discussed according to the input parameters of theprocess, and are compared to those obtained from cut tapping. The strength of the work material and the influence of the lubricant are the two main parameters affecting the process, and a correlation with the tapping torque is proposed. Finally, the characteristics of the thread surface depend on the parameters of the tapping operation, thus it has to be taken into account in the design approach when this tapping process is chosen.

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