Improving a Process for Completing a Positive Connection of Hub-Shaft Type Using Combine Methods

This paper describes an improved process for manufacturing a positive-locking hub-shaft joint. The process involves forming coatings on the contacting surfaces of the steel parts using the combined technology of electrospark alloying (ESA) followed by surface plastic deformation (SPD). In practice, it is suggested that the SPD treatment be carried out after the internal surfaces of the hub have been machined in the areas adjacent to its ends using the ESA method with copper or tin bronze. The SPD would cause compressive residual stresses to occur on the surface and increase the fatigue strength of the hub. It is also suggested that after ESA carburizing the hub shaft surface, it should be further processed by SPD. Further application of a soft antifriction metal layer of copper, silver, or tin bronze to the carburized layer by the ESA method and machining by the SPD ball rolling method will increase the fatigue strength of the shaft. In this case, the layer of soft antifriction material between the solid carburized layer and the indenter will be deformed.