doi:10.16186/j.cnki.1673-9787.2022040037

Received:2022-04-14

Revised:2023-04-18

Online Date: 2023-05-25

Study on feasibility and mechanism of thin rubber layer in improving shot peeningquality(Online)

FAN Junkai, LIU Shuai, ZHAO Wu

School of Mechanical and Power Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan， China

Abstract:Shot peening is a widely used surface treatment of metal workpiece. With the impact effect of high-speed shots，a high residual compressive stress layer can be formed at the workpiece surface by shot peening. Consequently，the mechanical property and fatigue performance of workpiece can be greatly improved. However，several negative factors，such as high surface roughness and micro-cracks can be generated simultaneously.It is generally accepted that the instantaneous impact behavior of shots on workpiece surface is the main reason. In this article，a new method that adding thin rubber layer as shock transfer medium was proposed with the aim of improving surface quality in shot peening. In addition，the feasibility and mechanism of thin rubber layer in shot peening were analyzed by finite element method. The results show that，compared with traditional shot peeing，a higher residual compressive stress can be gained at workpiece surface by adding the thin rubber layer. Meanwhile， surface roughness can be greatly reduced. In term of mechanism， the ability of rubber in improving impact area and time of shots on workpiece surface is the main reason.

Key words:shot peening;thin rubber layer;roughness;residual compressive stress;finite element method

CLC：TG668