14th International Conference on Shot Peening

Peening Intensity and Coverage Estimated by Simulation for Automotive Coil Spring

Jungkyu Shina, Jihoon Junga and Yongseok Yoon

Youngwire, R&D, 95 Gwanchang-gongdan-gil, Jugyo-myeon, Boryeong-si, Chungcheongnam-do, Republic of Korea – comshin@youngwire.com

Solution Lab, 1203, 20 Dunsanjung-ro, Seo-gu, Daejeon 35260, Republic of Korea – ysyoon@solution-lab.co.kr

Introduction

Shot peening is a typical and important process for the improvement of product operating life in automotive industry. Especially, among those products, coil spring must have two or more shot peening process for extremely high fatigue life expectation. As a tendency of lightweight design, coil spring, as is relatively light, becomes lighter and therefore, the higher design stress would threaten its fatigue life. With the design optimization to reduce the fatigue failure, shot peening process is also optimized by shot parameters such as a shot ball size and shape, material property, etc. Those trials can be verified when the newly-peened coil spring run the fatigue test or measured by residual stress. Practically, it takes several months to ascertain the effect or the improvement due to the change. The reason is that the shot peening facility is considered as the black-box and the change such as shot parameters can be indirectly checked by the test only. If the computer simulation model is set for the peening facility, the improvement effect can be directly expected and therefore, reduce the cost and the time.

Objectives

The computer simulation model is set up for one or both of the conventional peening facilities such as Sinto® and Wheelabrator®. The peening performances are verified by the measurement and shows the validity of the analysis model.