Análisis por Elementos Finitos de Perfiles en Llaves Dodecagonales

Abstract

The internal profile of box end wrenches usually does not coincide with the double hexagon, in order to get maximum
tolerance to dimensional changes of nut and wrench. A great variety of box end wrench profiles have been patented in last years. In this report a detailed finite elements analysis of the mechanics of contact between nut and wrench is performed, with the aim of setting criteria to determine a proper wrench profile.