范俊锴, 刘帅, 赵武.薄橡胶层在改善喷丸质量中的可行性及机理研究[J].河南理工大学学报（自然科学版）,doi:10.16186/j.cnki.1673-9787.2022040037

FAN J K, LIU S, ZHAO W.Study on feasibility and mechanism of thin rubber layer in improving shot peeningquality[J].Journal of Henan Polytechnic University (Natural Science) ,doi:10.16186/j.cnki. 1673-9787.2022040037

薄橡胶层在改善喷丸质量中的可行性及机理研究(网络首发)

范俊锴, 刘帅, 赵武

河南理工大学 机械与动力工程学院，河南 焦作 454000

摘要:喷丸是一种广泛使用的金属表面处理工艺。在丸粒的高速持续冲击作用下，喷丸能够在金属工件表面形成高强的残余压应力层，进而提升工件的疲劳寿命和综合力学性能。但丸粒的高速冲击同时也会导致金属表层粗 糙度的提升和微裂纹的萌生，形成影响工件质量的不利因素。从丸粒与工件表面的相互作用机制出发，在丸粒与工件表面瞬时冲击条件下，冲击作用域由点到面的演化特征及伴随产生的切向冲击力是影响工件质量的根本原因。基于此，本文提出在工件表面添加薄橡胶层，通过橡胶的大变形特征改善丸粒的瞬时冲击特征。通过有限元数值模拟方法，研究橡胶层放置形式、橡胶层厚度对工件表面残余压应力层和表面粗糙度的影响。结果表明，添加的薄橡胶层能够显著提高工件表面的残余压应力，工件表层的峰值残余压应力与传统喷丸基本相同，仅在残余压应力层厚度上略小于传统喷丸。橡胶的大变形特征增大了丸粒的冲击作用面积，延长了冲击作用时间，是薄橡胶层能够改善喷丸质量的根本因素。

关键词:喷丸;薄橡胶层;粗糙度;残余压应力;有限元法

中图分类号：TG668

doi:10.16186/j.cnki.1673-9787.2022040037

基金项目:国家自然科学基金资助项目（51405136）；河南省科技厅科技攻关项目（212102210004）；河南理工大学青年骨干教师资助计划（2020XQG-01）；河南理工大学机械工程重点学科资助

收稿日期:2022-04-14

修回日期:2023-04-18

网络首发日期: 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