表面超声滚压加工对配气机构凸轮轴材料滚动接触疲劳性能的影响  

Effect of surface ultrasonic rolling processing on rolling contact fatigue performance of camshaft material of valve train

作　　者：马梦阳 李小强[1,2] 赖福强 胡雄风 魏涛 屈盛官 MA Mengyang;LI Xiaoqiang;LAI Fuqiang;HU Xiongfeng;WEI Tao;QU Shengguan(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China;National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials,Guangzhou 510640,China;State Key Laboratory of Engine Reliability,Weifang 261061,China;Weichai Power Co.Ltd.,Weifang 261061,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640 [2]国家金属材料近净成形工程技术研究中心,广东广州510640 [3]内燃机可靠性国家重点实验室,山东潍坊261061 [4]潍柴动力股份有限公司,山东潍坊261061

出　　处：《中南大学学报（自然科学版）》2020年第9期2430-2441,共12页Journal of Central South University:Science and Technology

基　　金：内燃机可靠性国家重点实验室开放基金资助项目(skler-201811);广州市科技项目(201807010075);广东省科技项目(2018B090905002)。

摘　　要：为提高某型号发动机配气机构中凸轮材料C53钢的滚动接触疲劳性能,对材料表面进行不同静压力(分别为400,600,800和1000 N)的表面超声滚压加工(SURP),并分别对加工前后材料的表面形貌、表面粗糙度、显微硬度、表面残余压应力及接触疲劳等性能进行对比研究。研究结果表明:与未加工试样相比,经过SURP的试样其以上各性能都明显提升,其中,当静压力为600 N时,对材料各性能增强作用效果最好,包括使其表面质量最高,显微硬度(HV0.2)可由583.4(未加工)提升至661.1(SURP),表层残余压应力从−327.8 MPa(未加工)提高到−1437.6 MPa(SURP),并具有最长的滚动接触疲劳寿命;额定寿命(L10)、中值寿命(L50)、特征寿命(L63.2)分别为6.419×106,8.535×10和9.250×106转,分别为未加工试样相对应寿命的7.4,4.8和4.2倍。由此可知,SURP静压力为600 N对该种凸轮轴材料的疲劳性能提升作用最显著。To improve rolling contact fatigue resistance of a camshaft material C53 steel of valve mechanism,surface ultrasonic rolling processing(SURP)with different static rolling loads(400,600,800 and 1000 N)was introduced to process its surface.The surface morphology,surface roughness,micro-hardness,surface residual stress and rolling contact fatigue property of the untreated samples and the surface performance samples treated by SURP with different loads were studied and compared.The results show that compared with the untreated samples,the properties of the samples treated by SURP are significantly improved.Among different static rolling loads,the properties enhancement of the samples is the best with rolling load at 600 N,e.g.the best surface quality is obtained,the microhardness HV0.2 is increased from 583.4(untreated)to 661.1(SURP),and the surface residual stress increases from−327.8 MPa(untreated)to−1437.6 MPa(SURP).Similarly,the treatment with static rolling load at 600 N can contribute to the longest contact fatigue life of the material.The specified life(L10),median life(L50),characteristic life(L63.2)are 6.419×106,8.535×106 and 9.250×106 cycles respectively,which are 7.4,4.8 and 4.2 times of the corresponding life of untreated samples.Hence,SURP with static rolling load at 600 N has the most effective influence on improving rolling contact fatigue performance of this camshaft material.

关 键 词：表面超声滚压加工 凸轮轴材料 滚动接触疲劳寿命 滚动接触疲劳失效机理 

分 类 号：TG306[金属学及工艺—金属压力加工]