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| Research on Surface Integrity for GH4169 of CNC Polishing After Grinding |
| GAO Shimin, QUAN Fang, CHEN Zhitong |
| (School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China) |
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Abstract For the blade material GH4169, the process of CNC polishing after CBN wheel grinding was conducted.
Firstly, the influence of the pre-compression parameter on life of wool wheel and the roughness were studied. The influences of polishing depth on the surface topographic characters of surface integrity including surface roughness, surface
micro-hardness, and surface residual stress, were studied to optimize the polishing depth. With the increasing of the polishing
depth, the roughness Ra drops firstly and then gets stable, and the surface micro-hardness decreases. The normal residual
stress in the feed direction shows a trend from rise to decline, while in the vertical feed direction, it stays unchanged basically
and then decreases. The polishing depth after optimized is 2μm, and pre-compression parameter is about from 0.5mm
to 1.0mm. It has a small roughness of 0.3μm, a macro-hardness of HV389.36 and the high compressive stresses after CBN
grinding, which are -871.6MPa and -1084.0MPa for two principal stress directions.
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2016, 
