镍基高温合金孔珩磨余量对加工质量的影响

针对典型的难加工材料镍基高温合金GH4169开展系统珩磨试验，研究了孔加工表面粗糙度值、圆柱度的变化规律。结果表明:金属结合剂CBN油石珩磨GH4169孔时，随着珩磨进行，表面粗糙度值逐渐下降并趋于稳定，磨粒平均粒度尺寸为100、34和8 μm的油石，所加工的表面能达到的最佳表面粗糙度值R_a分别为0.7、0.3和0.1 μm。基于试验结果，建立了底孔最小加工余量预测模型和最大圆柱度允差预测模型，并进行了试验验证，所建立模型的误差均在10%以内。 

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%.