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镍基高温合金高速铣削加工表面完整性研究的中期报告 摘要: 镍基高温合金由于其高温强度和抗氧化性能,在航空、航天、船舶等领域得到广泛应用。高速铣削是一种高效率、高质量的加工方式,被广泛运用于镍基高温合金的加工中。然而,高速铣削会对工件表面产生不利影响,如表面粗糙度增大、形状精度下降、表面裂纹等。因此,研究高速铣削加工表面完整性及其影响因素对于优化加工工艺和提高加工质量具有重要意义。 本研究采用镍基高温合金Inconel718作为试验材料,在高速铣削加工过程中,分析了切削速度、进给量、切削深度对于工件表面完整性的影响。结果表明,切削速度和进给量对表面粗糙度和形状精度具有显著影响,切削深度对表面裂纹产生的影响较大。此外,通过SEM分析发现,高速铣削会引起表面微细晶粒的形成和晶界的增多,从而导致表面完整性变差。 关键词:镍基高温合金;高速铣削;表面完整性;切削速度;进给量;切削深度 Abstract: Nickel-basedsuperalloysarewidelyusedinaviation,aerospace,shipbuildingandotherfieldsduetotheirhightemperaturestrengthandoxidationresistance.High-speedmillingisanefficientandhigh-qualitymachiningmethod,whichiswidelyusedinthemachiningofnickel-basedsuperalloys.However,high-speedmillingwillhaveadverseeffectsonthesurfaceoftheworkpiece,suchasanincreaseinsurfaceroughness,adecreaseinshapeaccuracy,andsurfacecracks.Therefore,studyingthesurfaceintegrityofhigh-speedmillinganditsinfluencingfactorsisofgreatsignificanceforoptimizingthemachiningprocessandimprovingmachiningquality. Inthisstudy,nickel-basedsuperalloyInconel718wasusedasthetestmaterial.Theeffectsofcuttingspeed,feedrate,andcuttingdepthonthesurfaceintegrityoftheworkpiecewereanalyzedduringhigh-speedmilling.Theresultsshowthatcuttingspeedandfeedratehaveasignificantimpactonsurfaceroughnessandshapeaccuracy,whilecuttingdepthhasagreaterimpactonsurfacecrackformation.Inaddition,SEManalysisfoundthathigh-speedmillingcancausetheformationofsurfacefinegrainsandanincreaseingrainboundaries,leadingtoadeteriorationinsurfaceintegrity. Keywords:nickel-basedsuperalloy;high-speedmilling;surfaceintegrity;cuttingspeed;feedrate;cuttingdepth