冷却润滑方式对纯铁车削表面完整性的影响

发布时间：2018-03-28 21:20

本文选题：纯铁　切入点：表面粗糙度　出处：《华南理工大学学报(自然科学版)》2015年06期

【摘要】：为提高纯铁材料精加工时的表面质量,在相同切削参数下进行了干切、水冷、菜籽油润滑和微量润滑(MQL)4种方式下的切削试验,分析冷却润滑方式对工件表面完整性的影响机理.结果表明:MQL和菜籽油润滑比水冷和干切更有利于提高表面粗糙度;4种冷却润滑方式下已加工表面显微硬度具有相同的变化趋势,硬化层深度为60~70μm;表层晶粒呈严重的扭曲拉伸状塑性变形,干切时塑性变形层深度最大,其次为菜籽油润滑和MQL,水冷时最小;工件表面切向和轴向均呈残余拉应力,且切向应力大于轴向应力,而且冷却润滑方式对表面残余应力影响不大.试验结果对纯铁精加工选择合适的冷却润滑方式以提高表面完整性具有重要意义.
[Abstract]:In order to improve the surface quality of pure iron materials during finishing, the cutting tests were carried out under the same cutting parameters, such as dry cutting, water cooling, rapeseed oil lubrication and micro lubricating MQL. The effect of cooling lubrication mode on the surface integrity of workpiece is analyzed. The results show that the microhardness of machined surface is better than that of water cooling and dry cutting. The same trend, The depth of hardened layer is 600 ~ 70 渭 m, the grain in the surface is distorted and tensile plastic deformation is serious, the depth of plastic deformation layer is the largest at dry cutting, the next is rapeseed oil lubrication and MQL, and the water cooling is the smallest, and the surface tangential and axial tensile stress of workpiece are both residual tensile stress. The tangential stress is larger than the axial stress and the cooling lubrication mode has little effect on the surface residual stress. The experimental results are of great significance for the selection of proper cooling lubrication mode to improve the surface integrity of pure iron.
【作者单位】：南京航空航天大学机电学院;中国工程物理研究院机械制造工艺研究所;
【基金】：国家自然科学基金资助项目(51375236) 中国工程物理研究院超精密加工技术重点实验室基金资助项目(ZZ13015)~~
【分类号】：TG51

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