【摘要】 采用自制的基于普通车床CA6140的螺纹根部滚压强化装置对45钢螺纹试样进行滚压强化工艺处理。使用三维形貌测量仪、显微硬度计、X射线残余应力检测仪、超景深显微镜等检测设备，对滚压完成后的螺纹根部表面粗糙度、表层显微硬度、残余应力，表层显微组织等表面完整性参数进行检测。通过进行单因素试验，探究了螺纹根部滚压强化工艺参数对表面完整性的影响。45钢螺纹试样经过滚压强化工艺后，其螺纹根部的表面粗糙度S_a由1.71μm减小到0.874μm;螺纹根部形成了明显的晶粒细化层，深度达到了120μm;显微硬度由199.3 HV增加到379.5 HV,硬化程度N=90.4%;表层残余应力呈勺型分布，残余应力在距离表面105μm处达到峰值，为-542 MPa,残余压应力层深度可达700μm。研究结果表明：滚压强化技术可以显著提高螺纹根部的表面完整性，且滚压深度这一工艺参数对其的影响最为显著。更多还原

【Abstract】 The self-made thread root rolling strengthening device based on common lathe CA6140 was used to perform rolling strengthening process on 45 steel thread samples. The surface integrity parameters such as surface roughness, surface microhardness, residual stress and surface microstructure of thread root after rolling were measured by using three-dimensional topography measurement instrument, microhardness tester, X-ray residual stress detector and ultra-depth of field microscope. The effect of rolling strengthening parameters on the surface integrity of thread root was investigated by single factor test. After the 45 steel thread sample underwent the rolling strengthening process, the surface roughness S_a of the thread root is reduced from 1.71 μm to 0.874 μm; the thread root forms an obvious grain refinement layer with a depth of 120 μm; the microhardness increases from 199.3 HV to 379.5 HV, and the hardening degree N=90.4%; the residual stress of the surface layer is distributed in a spoon shape, and the residual stress reaches a peak value of-542 MPa at 105 μm from the surface, and the depth of the residual compressive stress layer can reach 700 μm. The results show that the rolling strengthening process can significantly improve the surface integrity of the thread root, and the rolling depth has the most significant effect.更多还原