Influence of Internal Hub Profile on Joining Process of Shaft-hub-connection by Lateral Extrusion

Abstract

Mori et al. (2013) identified the current commercial requirements for higher performance, higher productivity, lower cost and joining of dissimilar materials to lead to a strong demand for new joining and especially joining by forming processes. When joining a shaft-hub-connection by lateral extrusion of the shaft a combination of form- and friction locked join is established. The internal hub profile which defines the form-closed joint in circumferential direction significantly affects the forming process and hence connection properties. The internal hub profile is mainly characterized by the profile eccentricity e, the number of teeth n and type of profile. This study mainly deals with the experimental investigations concerning the influence of the internal hub profile parameters on the forming process and part properties. To identify a suitable internal hub profile characterized by low punch forces, minimal and homogeneous radial deformations and high hub cavity filling numerous joining by forming processes are carried out wherein the mentioned profile parameters are varied. To evaluate the influence of internal hub profile the punch force-stroke curves, the roundness deviation of the hub and the hub cavity filling are used.