第49卷第3期海洋工程DOI：10.3969/j.issn.1001-2206.2023.03.003海洋平台型材高速切削切屑演化规律研究杨斌，马连山，耿凯，代福强中国石油集团海洋工程（青岛）有限公司，山东青岛266520摘要：高速切削加工具有高效率、低耗能、高精度等优点，广泛应用于难加工材料的切割与制造中。随着切削速度的提高，切屑会由连续状转变为锯齿状及不连续分段状。不连续分段状切屑的形成伴随着切削力的极大波动，导致加工精度和加工质量的下降，因此研究不连续分段状切屑的形成机理对高速切削有着重要的意义。选取海洋平台316L钢型材为研究对象，建立其切削有限元模型，分析了切削条件对切屑形貌、切削力、切削温度及形成不连续分段状切屑临界切削速度的影响，揭示了不连续分段状切屑的形成机理。结果表明，不连续分段状切屑是周期性绝热带演化、裂纹萌生及扩展的结果，剪切带在主剪切区发育使裂纹在刀尖成核，并沿剪切带由刀尖向切屑自由表面扩展。另外，形成不连续分段状切屑的临界切削速度随切削厚度的增大而降低，随刀具倾角提高而上升，因此在实际加工过程中需优化上述参数以保证加工质量。关键词：高速切削；316L钢；不连续分段状切屑；临界切削速度Researchonevolutionlawofchipsbyhigh-speedcuttingforoffshoreplatformprofileYANGBin,MALianshan,GENGKai,DAIFuqiangCNPCOffshoreEngineeringCompany(Qingdao),Qingdao266520,ChinaAbstract：High-speedcuttingiswidelyusedinthecuttingandmanufacturingofdifficult-to-machinematerialsduetoitsadvantagesofhighefficiency,lowenergyconsumption,andhighprecision.Ascuttingspeedincreases,thechipshapechangesfrombeingcontinuoustobeingserratedanddiscontinuouslysegmented.Theformationofdiscontinuouslysegmentedchipsisalwaysaccompaniedbyagreatfluctuationofcuttingforce,whichleadstoadeclineinmachiningaccuracyandmachiningquality.Therefore,itisofgreatsignificancetostudytheformationmechanismofdiscontinuouslysegmentedchipsinhigh-speedcutting.Inthiswork,theoffshoreplatform316Lsteelprofileisstudied,anditsfiniteelementmodelofcuttingisestablished.Theinfluenceofcuttingconditionsonthechipshape,cuttingforce,cuttingtemperature,andcriticalcuttingspeedforformingdiscontinuouslysegmentedchipsisanalyzed,soastorevealtheformationmechanismofdiscontinuouslysegmentedchi...
