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.