微晶刚玉砂轮缓进给磨削镍基高温合金GH4169及花键研究

镍基高温合金GH4169作为一种典型的难加工材料，已被广泛应用于航空发动机各类零部件。微晶刚玉砂轮以其优异的自锐性正被逐渐用于磨削加工航空材料。为优选加工高温合金涡轮轴花键的砂轮，使用SG、5SG和TG三种磨料的微晶刚玉砂轮开展高温合金缓进给磨削试验，研究磨料种类对磨削力、磨削温度和表面粗糙度的影响规律。研究结果表明:缓进给磨削高温合金GH4169时，5SG磨料微晶刚玉砂轮的磨削力和温度最小，TG磨料砂轮次之，SG磨料砂轮最大。三种磨料砂轮磨削后的工件表面粗糙度值R_a均在0.3 μm以下。最后，选用5SG磨料微晶刚玉砂轮加工高温合金花键样件，各项检测结果均能满足指标要求。 

Creep-feed grinding of nickel-based superalloy GH4169 spline using micro-crystalline alumina wheels

Nickel-based superalloy GH4169,as a typical difficult-to-cut material,has been widely used in aero-engine components.The micro-crystalline alumina wheel is becoming popular in grinding aeroengine materials due to its excellent performance of self-sharpening.In order to find out the most suitable wheel to manufacture superalloy components,experiments on creep-feed grinding nickel-based superalloy are carried out using SG,5SG and TG abrasive wheels to investigate the influence of abrasive types on grinding force,grinding temperature and surface roughness.The results show that the grinding force and grinding temperature are the smallest when using 5SG abrasive wheel,followed by TG abrasive wheel,then SG abrasive wheel.The surface roughness values are all below 0.3 μm after grinding with the tested wheels.When 5SG abrasive micro-crystalline alumina wheel is chosen to manufacture the superalloy spline specimen,all detected results meet the requirements well.