镍基高温合金K4125磨削性能与参数优化研究

Grinding Performance and Parameter Optimization of Nickel-Based Superalloy K4125

镍基高温合金K4125是燃气涡轮导向叶片的主要材料。通过理解K4125的磨削加工性,可以优化磨削工艺参数,改善材料去除效率。对比了K4125与GH4169的材料性能差异,开展了磨削试验,通过对比分析磨削力、磨削温度、磨削比能以及表面粗糙度等参数,综合分析了材料磨削性能差异。结果表明K4125的磨削力均大于GH4169的磨削力。磨削K4125合金时,磨削温度保持在400℃以上,而GH4169合金的磨削温度则在200℃以下。K4125已加工表面的涂抹、磨屑粘黏以及沟槽现象均比GH4169严重。该现象导致K4125的磨削表面粗糙度远大于GH4169。因此,K4125的磨削加工性差于GH4169。磨削K4125的推荐参数为砂轮线速度v_(s)=25~30m/s,工件进给速度v_(w)=500~1000mm/min,磨削深度a_(p)=0.01~0.02mm。

The guide blade is mainly composed of nickel-based superalloy K4125,which is a typical difficult-tocut material.The understanding of grinding performance of K4125 can help to optimize the grinding process parameters and improve the material removal efficiency.In this article,the material property difference between K4125 and GH4169 is discussed firstly.Then,the grinding experiments are carried out.The grinding performances are compared on the basis of grinding force,grinding temperature,specific energy and surface roughness.The results show that the grinding force of K4125 is always higher than that of GH4169.The grinding temperature of K4125 is over 400℃,while the grinding temperature of GH4169 is lower than 200℃.Nevertheless,the phenomena of coating and redeposited chip on the ground surface of K4125 are more serious than that of GH4169.The size of the striation on the ground surface of K4125 is larger and the surface roughness of K4125 is larger.The grindability of K4125 is poorer than that of GH4169.The optimal grinding parameters is selected as follows:grinding wheel speed v_(s)=25~30m/s,infeed speed v_(w)=500~1000mm/min,grinding depth a_(p)=0.01~0.02mm.