20CrMnTi磨削表面质量试验研究  

Experiment study on the 20CrMnTi ground surface performances

作　　者：刘瑶 李睿 赵亦东 徐利军 吴重军 LIU Yao;LI Rui;ZHAO Yidong;XU Lijun;WU Chongjun(College of Mechanical Engineering, North University of China, Taiyuan 030051, China;Shanghai Space Propulsion Technology Research Institute, Shanghai 201108, China;College of Mechanical Engineering, Donghua University, Shanghai 201600, China)

机构地区：[1]中北大学机械工程学院,太原030051 [2]上海航天动力技术研究所,上海201108 [3]东华大学机械工程学院,上海201600

出　　处：《金刚石与磨料磨具工程》2020年第4期70-75,共6页Diamond & Abrasives Engineering

摘　　要：为了探讨磨削工艺参数对20CrMnTi磨削表面质量的影响,采用CBN砂轮开展单因素磨削试验,选取表面洛氏硬度H、表面残余应力σs和亚表面残余应力分布σss作为指标,通过试验分析20CrMnTi的磨削加工特性。试验结果表明:相同条件下,H随着砂轮线速度vs和磨削深度ap的增大而减小,随着工件进给速度vw的增大而增大,且ap的影响最大、vw的次之、vs的最小;磨削后工件表面表现为残余压应力,压应力σs的大小(绝对值)随着vw增大而增大,随着ap增大而减小,随vs增大呈现波动;磨削后工件的σss随着ap增大逐渐由压应力转变为拉应力,最后趋于0;在小vs和较小ap时,在相同亚表面深度情况下可以获得更大的压应力或者更小的拉应力。在本试验所讨论的参数范围内,vs=60 m/s,vw=1.045 m/s,ap=3μm时可以获得较高H和残余压应力以及较好的σss,即20CrMnTi磨削加工质量较好。To explore the grinding parameters′effect on 20CrMnTi ground surface quality,the grinding experiments by using CBN wheel were conducted.The characteristic of ground surface Rockwell hardness H,surface residential stressσs,and subsurface residential stressσss were discussed to reveal the grinding ability of 20 CrMnTi by using the single factor experiment.The results indicate that under the same condition,the H decrease with the increase of wheel speed vs and grinding depth ap,and increase with the increase of wheel feed rate vw.The ap has the greatest influence,followed by the vw and vs.The ground surface is equipped with the compressive residential stress.The compressive stress(absolute value)shows the increase with the increase of vw and decrease of ap.As the vs increase,theσs fluctuated.With the increase of subsurface depth,theσss changes from compressive stress to tensile stress and finally becomes close to 0.Theσss distribution looks better in lower vs and shallower ap.By using vs=60 m/s,vw=1.045 m/s,ap=3μm,the higher H and surface residential compressive stress,and betterσss distribution can be obtained,which shows better ground surface quality.

关 键 词：20CrMnTi 表面显微硬度 残余应力 磨削表面质量 

分 类 号：TG58[金属学及工艺—金属切削加工及机床] TH161[机械工程—机械制造及自动化]