Effect of Cutting-Edge Geometry and Workpiece Hardness on Surface Residual Stresses in Finish Hard Turning of AISI 52100 Steel
Effect of Cutting-Edge Geometry and Workpiece Hardness on Surface Residual Stresses in Finish Hard Turning of AISI 52100 Steel
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DOI：
10.1115/1.1286369
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发表时间：
1999-11
期刊：
影响因子：
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通讯作者：
Jeffrey D. Thiele;S. Melkote;R. Peascoe;T. Watkins
中科院分区：
文献类型：
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作者：
Jeffrey D. Thiele;S. Melkote;R. Peascoe;T. Watkins
进行了一项实验研究，以确定刀具切削刃的几何形状和工件硬度对表面残余应力的影响，精硬车削贯穿硬化AISI 52100钢。在这项研究中，多晶立方氮化硼（PCBN）刀片的代表性类型的边缘几何形状，包括“向上锋利”的边缘，边缘珩磨，倒角，被用作切削工具。这项研究表明，工具边缘的几何形状是非常有影响力的表面残余应力，这是使用X射线衍射测量。通常，轴向和周向方向上的压缩表面残余应力由用于纵向车削操作的大刃珩磨工具产生。由小刃珩磨工具产生的轴向和周向方向上的残余应力通常比由大刃珩磨工具产生的应力更大。显微组织分析表明，热效应是显着的，在高进给速度，基于工件表面上的相变的存在。在高进给速率下，压应力与工件表面上的连续白色层相关，而拉应力与工件表面上的过度回火区域相关。机械效应在低进料速率下起更大的作用，其中未观察到显著程度的相变。对于这些情况，大刃珩磨工具通常比小刃珩磨工具产生更多的残余应力压缩值。
An experimental investigation was conducted to determine the effects of tool cutting-edge geometry and workpiece hardness on surface residual stresses for finish hard turning of through-hardened AISI 52100 steel. Polycrystalline cubic boron nitride (PCBN) inserts with representative types of edge geometry including “up-sharp” edges, edge hones, and chamfers, were used as the cutting tools in this study. This study shows that tool edge geometry is highly influential with respect to surface residual stresses, which were measured using x-ray diffraction. In general, compressive surface residual stresses in the axial and circumferential directions were generated by large edge hone tools, for longitudinal turning operations. Residual stresses in the axial and circumferential directions generated by small edge hone tools are typically more tensile than stresses produced by large edge hone tools. Microstructural analysis shows that thermal effects are significant at high feed rates, based on the presence of phase changes on the workpiece surface. At high feed rates, compressive stresses correlate with continuous white layers and tensile stresses correlate with over-tempered regions on the surface of the workpiece. Mechanical effects play a larger role at low feed rates, where phase changes are not observed to a significant degree. For these cases, large edge hone tools generally produce more compressive values of residual stress than small edge hone tools.