Effects of Shot Peening on Residual Stresses in Gear Surfaces

Author:  Students: Doug Blomeke, Cayley Dymond, Hojung Kim, Xiaomeng Zhang. Faculty Advisor: Dr. David Bahr
Source:  Purdue University
Doc ID:  2016043
Year of Publication:  2016
Abstract:  
The ZF TRW Lafayette branch produces power steering systems for the heavy duty trucking industry. To meet safety and performance standards for their customers, ZF TRW uses shot peening to increase the fatigue lffe of their products. They need to understand how the shot peening process affects the resulting microstructure of the rack piston for the THP60 power steering pump and the impact on mechanical properties. Our goal is to provide guidance on which parameters are the most important in the shot peening process and how modffying these parameters affects the microstructure, residual stress, and hardness.