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Profile grinding of DZ125 nickel-based superalloy: Grinding heat, temperature field, and surface quality
Journal of Manufacturing Processes ( IF 6.2 ) Pub Date : 2020-06-20 , DOI: 10.1016/j.jmapro.2020.06.022
Zhengcai Zhao , Ning Qian , Wenfeng Ding , Yang Wang , Yucan Fu

During the high-efficiency deep grinding of a turbine blade root, localized thermal damage of the profile surface could easily occur owing to the complexity of the grinding dynamics and cooling conditions in the grinding zone. Therefore, it is worthwhile to investigate the generation of the grinding heat, the grinding temperature and its distribution, and the grinding surface quality, particularly for superalloys used to produce aero-turbine blades. In this study, the specific grinding energy and grinding heat flux during the profile grinding of a fir tree-shaped root of a DZ125 superalloy turbine blade were investigated. The grinding temperature at four points on the profile were measured and the results were used to conduct a three-dimensional simulation to analyze the temperature distribution on the machined surface and in the direction of the cutting depth. The effects of the heat source shape and contact length on the temperature distribution were also examined. A moderately high material removal rate was found to be beneficial to the surface quality, with a maximum material removal rate of 50.6 mm3/mm·s producing a surface roughness of Ra 0.6 μm without saturation or microstructural changes. Residual compressive stress was also achieved on the ground surface.



中文翻译:

DZ125镍基高温合金的轮廓磨削:磨削热,温度场和表面质量

在涡轮叶片根部的高效深磨期间,由于磨削动力学和磨削区中冷却条件的复杂性,轮廓表面的局部热损坏很容易发生。因此,有必要研究磨削热的产生,磨削温度及其分布以及磨削表面质量,特别是对于用于制造涡轮叶片的高温合金而言。在这项研究中,研究了DZ125高温合金涡轮叶片的枞树形根部轮廓磨削过程中的比磨削能量和磨削热通量。测量轮廓上四个点的磨削温度,并将结果用于三维模拟,以分析加工表面上和切削深度方向上的温度分布。还检查了热源形状和接触长度对温度分布的影响。发现适度高的材料去除速率对表面质量有利,最大材料去除速率为50.6 mm3 / mm·s产生Ra 0.6μm的表面粗糙度,而没有饱和或微结构变化。在地面上也达到了残余压应力。

更新日期:2020-06-20
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