Joining polymer parts with self-tapping screws: an improvement of the screw thread geometry

Journal ar
International Journal of Material Forming
  • Fecha: 01 enero 2020
  • ISSN: 19606214 19606206
  • Tipo de fuente: Revista
  • DOI: 10.1007/s12289-020-01593-6
  • Tipo de documento: Artículo
  • Editorial: Springer-Verlag Italia
© 2020, Springer-Verlag France SAS, part of Springer Nature.In the present article, the influence of the self-tapping screw¿s geometry during the thread forming processes in polymer types used in several industries was studied and analysed using experimental measurement and the finite element method. A number of parameters, such as assembly, type of materials and geometry, were studied. Several commercial screw topologies were also studied, and it was demonstrated that the geometry of the self-tapping screws could be optimised. A new geometry was proposed and then compared against the commercial self-tapping screws. The proposed screw obtained a smaller installation torque and a greater stripping torque, which resulted in a greater clamp load in the self-tapping joining. The clamp load loss due to relaxation was reduced up to 10% compared to the best existing geometry.

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