Wang Haining, Li Xun, Wang Ziming, Xu Rufeng
School of Mechanical Engineering, Shandong University of Technology, Zibo 255049, China.
School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China.
Materials (Basel). 2020 Feb 23;13(4):1005. doi: 10.3390/ma13041005.
The electroplated cubic boron nitride (CBN) wheel has perfect precision retention and high-temperature grinding performance, which is widely used in the field of grinding difficult-to-cut materials, such as nickel-based superalloy. However, the research on the influence law and mechanism of grinding surface morphology affected by the wear state of small-size grinding wheel is insufficient, which limits the further promotion and application of electroplated CBN wheel in the field of precision grinding of superalloy materials. Based on the in-depth analysis of the structure of FGH96 turbine disk, and combined with the actual processing requirements, the electroplated CBN wheel was designed, and the abrasive grains size selection experiments and CBN wheel wear experiments were then carried out for the powder metallurgy superalloy FGH96 in turn. The influence law of the abrasive grain size of CBN grinding wheel and the wear state of grinding wheel on the surface morphology was investigated, respectively. The obtained results showed that under the given processing parameters, the surface roughness using 400# and 600# electroplated CBN wheels are around 0.66 μm and 0.53 μm during the normal wear state of grinding wheels, respectively, which can meet the requirement of surface quality less than 0.8 μm in engineering application of turbine disk, and prove the feasibility of small-size CBN wheel grinding FGH96. In addition, the failure form of electroplated CBN wheel is mainly the accumulation and adhesion of abrasive debris, and the crushing and shedding of abrasive grain are hard to appear.
电镀立方氮化硼（CBN）砂轮具有优异的精度保持性和高温磨削性能，广泛应用于磨削难切削材料领域，如镍基高温合金。然而，关于小尺寸砂轮磨损状态对磨削表面形貌的影响规律及作用机制的研究尚不充分，这限制了电镀CBN砂轮在高温合金材料精密磨削领域的进一步推广应用。基于对FGH96涡轮盘结构的深入分析，并结合实际加工要求，设计了电镀CBN砂轮，进而针对粉末冶金高温合金FGH96依次开展了磨粒粒度选择试验和CBN砂轮磨损试验。分别研究了CBN砂轮磨粒粒度和砂轮磨损状态对表面形貌的影响规律。结果表明，在给定加工参数下，砂轮正常磨损状态时，使用400#和600#电镀CBN砂轮磨削后的表面粗糙度分别约为0.66μm和0.53μm，能够满足涡轮盘工程应用中表面质量小于0.8μm的要求，证明了小尺寸CBN砂轮磨削FGH96的可行性。此外，电镀CBN砂轮的失效形式主要为磨屑堆积与黏附，磨粒破碎与脱落现象难以出现。
