摘要
以W6Mo5Cr4V2高速钢磨削试件为研究对象,提出运用深冷处理技术来调整磨削表面残余应力,并借助试验和数值模拟来分析磨削试件表面的残余应力,将X射线衍射法对残余应力的测量结果与数值模拟的结果进行分析、比较。结果表明,经深冷处理后,试件等效应力Max.Mises由磨削时的248.9 MPa降低到114.3 MPa,主应力由124.0 MPa降低到91.61 MPa;试件x方向残余应力S11处于拉应力状态,Max.S11由磨削时的105.8 MPa降低到63.48 MPa;试件y方向残余应力S22处于压应力状态,Max.S22由磨削时的-272.6 MPa增加到-287.8 MPa,而压应力正是加工表面期望得到的应力状态,从而有效地降低了磨削表面层的残余应力。试验结果验证了有限元模型的正确性。
Taking grinding specimen of W6MoSCr4V2 HSS as the research object, the cryogenic treatment technology which can adjust the grinding surface residual stress was put forward, the grinding surface residual stress was analyzed by means of experiment and numerical simulation, residual stress measurements with the X-ray diffraction method and the results of finite element simulation were analyzed and compared. The results show that after cryogenic treatment, the equivalent stress Max Mises of the specimens reduces from 248.9 MPa to 114.3 MPa when grinding. The principal stress reduces from 124.0 MPa to 91.61 MPa. The residual stress of specimen at X direction S11 is tensile stress, and the Max. S11 reduces from 105.8 MPa to 63.48 MPa when grinding; the residual stress of specimen at Y direction $22 is compressive stress. Max. $22 increases from -272.6 MPa to -287.8 MPa when grinding and the compressive stress is obtained; thus it effectively reduces the surface residual stress after grinding. The experimental result verifies the correctness of the finite element model.
出处
《热加工工艺》
CSCD
北大核心
2015年第2期227-231,共5页
Hot Working Technology
基金
国家自然科学基金资助项目(51275333/E050901)
关键词
深冷处理
残余应力
高速钢
数值模拟
X射线衍射
cryogenic treatment
residual stress
high-speed steel
numerical simulation
X-ray diffraction
