Zhang Xiaodong, Jiang Xiaoyang, Li Maojun, Gong Pan
State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha 410082, China.
State Key Laboratory of Materials Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Materials (Basel). 2023 Jan 2;16(1):425. doi: 10.3390/ma16010425.
20Cr2Ni4A alloy is widely used in the manufacturing of heavy-duty gears, although limited information about its machinability during the form-grinding process has been reported. In this work, form-grinding trials on transmission gears of 20Cr2Ni4A alloy under various parameters were conducted. Surface morphology of the gear tooth, surface roughness distribution and microstructure evolution of the machined surface layer were comprehensively studied, and the influence of grinding parameters on grinding performance was investigated. The formation mechanisms of surface/subsurface defects during the form-grinding process, including plastic flow, deep grooves, successive crushing zone, adhesive chips and cavities, were analyzed. Results showed that the change in contact conditions between the grinding wheel and tooth surface led to the decrease in the surface roughness from tooth tip to root. Mechanical force and grinding heat promoted the deformation and refinement of the microstructure within the machined surface layer. With the increase in cutting depth and feed speed, the deformation ratio of the microstructure increased, which was also consistent with the variation trend in the form-grinding temperature.
20Cr2Ni4A合金广泛应用于重型齿轮的制造，尽管关于其在成形磨削过程中的可加工性的报道有限。在这项工作中，对20Cr2Ni4A合金传动齿轮在各种参数下进行了成形磨削试验。综合研究了齿轮齿的表面形貌、表面粗糙度分布以及加工表面层的微观结构演变，并研究了磨削参数对磨削性能的影响。分析了成形磨削过程中表面/亚表面缺陷的形成机制，包括塑性流动、深槽、连续破碎区、粘结切屑和空洞。结果表明，砂轮与齿面接触条件的变化导致齿面粗糙度从齿顶到齿根逐渐减小。机械力和磨削热促进了加工表面层内微观结构的变形和细化。随着切削深度和进给速度的增加，微观结构的变形率增大，这也与成形磨削温度的变化趋势一致。
