Researches on Mechanisms and Technologies of Profile Grinding Difficult-to-cut Materials with High Efficiency and High Precision

摘要

Superalloys have wide application in the field of aeronautics and astronautics for theri physical and mechanical properties such as heat stability, high stength, corrosionl-resistance and wear resistance. Due to bad grindability. low thermal conductivity, high toughness and hardenability, there yield high grinding forces and temperature during profile grinding of superalloys. Thus the grinding burn and thermal microcracks usually occur, which deterorate the surface quality seriously and have ad influence upon the practical performance of parts, and lead to lwo stock-removing efficiency.THe other obstacle to profile grinding with high efficiency and high precision is the low retainability of profile precision of the grinding wheel. In this paper, a lot of experiemntal studies have been maide on the mechanisms of grinding burm during profile grinding superalloys. Some appropriate technologies were proposed to bring about high efficiency and high precision during profile grinding superalloys. With the main aid of metallographical inspection and the measuring of grinding temperature as well as the surface toposgraphy of the parts, the relationships of the maximum average contact zone temperature and the color on the burnt surface, the burnt surface topogrpahy, the texture state and microhardness distribution of the surface layer were revealed. The results deonstrated the definit relation between them.