58SiMn高强度钢车削表面完整性的试验研究

发布时间：2018-04-08 22:27

本文选题：表面完整性　切入点：高强度钢　出处：《表面技术》2017年01期

【摘要】：目的研究58Si Mn高强度钢表面完整性评价指标受切削参数影响的变化规律。方法分别设计单因素和正交试验,采用涂层硬质合金刀具对58Si Mn高强度钢进行车削加工试验,通过采集相关数据,分别讨论了切削深度、进给速度和切削速度变化对表面粗糙度、残余应力、显微硬度和表层微观组织变化等方面的影响。结果进给速度对表面粗糙度的影响最显著,切削速度次之,切削深度的变化对表面粗糙度无直接影响。已加工表面的残余应力随切削速度和进给量的增大而增大。显微硬度随切削深度的增大而减小,随进给量的增大而增大,层深上的显微硬度则呈现先减小后增大的趋势。表层微观组织受切削速度影响不大,未出现明显的相变和晶粒歪曲。结论降低进给速度是减小工件表面粗糙度最直接有效的方法,提高切削速度并不能使表面粗糙度明显减小。工件表面的轴向和切向残余应力均为拉应力,为提高零件使用性能,应采取相应的措施使之转化为压应力。
[Abstract]:Aim to study the influence of cutting parameters on the surface integrity evaluation of 58Si mn high strength steel.Methods single factor and orthogonal test were designed, and the turning test of 58Si mn high strength steel with coated cemented carbide tool was carried out. The cutting depth was discussed by collecting relevant data.The effects of feed rate and cutting speed on surface roughness, residual stress, microhardness and microstructure of the surface.Results the influence of feed speed on surface roughness is the most obvious, and cutting speed is the second, and the change of cutting depth has no direct effect on surface roughness.The residual stress of the machined surface increases with the increase of cutting speed and feed rate.The microhardness decreases with the increase of cutting depth and increases with the increase of feed rate. The microhardness on the layer depth decreases first and then increases.The microstructure of the surface layer is not affected by the cutting speed, and there is no obvious phase transformation and grain distortion.Conclusion reducing the feed rate is the most direct and effective method to reduce the surface roughness of the workpiece, and increasing the cutting speed can not obviously reduce the surface roughness.The axial and tangential residual stresses on the surface of the workpiece are both tensile stresses. In order to improve the performance of the parts, corresponding measures should be taken to transform them into compressive stresses.
【作者单位】：北京理工大学先进加工技术国防重点学科实验室;
【基金】：国家自然科学基金项目(51105035)~~
【分类号】：TG51

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