Effect of machining allowance on machining quality in honing nickel-base superalloy

For typical difficult-to-machine materials of nickel-base superalloy GH4169,honing experiments are carried out to study the hole surface roughness and cylindricity.Resultsshow that the surface roughness decreases gradually and tends to be stable as honing continues when honing GH4169 using metal bonded CBN oilstone.The best surface roughness is R_a 0.7 μm when using the grit size 100 μm oilstone,R_a 0.3 μm using 34 μm oilstone and R_a 0.1 μm using 8 μm oilstone.Based on the results,two prediction models,namely the minimum bottom hole machining allowance prediction model and the maximum allowable deviation of cylindricity prediction model,are established and verified by relevant experiments.It turns out that the errors of the models are less than 10%.