在圆锥滚子徐州SKF轴承的磨削过程中，砂轮与工件的接触区消耗大量的能*量，产生大量的磨削热，导致磨削区局部瞬时高温。磨削区的瞬时温度为0.1-0.001，**大为1000-1500（？）c.利用线性移动热源传热理论*公式或红外、热电偶法推导、计算或测量实验条件下的瞬时温度。这种瞬间高温足以引起高温氧化、无定形结构、高温回火、二次淬火，甚至在工作表面一定层次的表面上烧制。InthegrindingprocessofSKFbearingwithtaperedrollerinXuzhou,alargeamountofenergyisc***umedinthecontactareabetweengrindingwheelandworkpiece,resultinginalargeamountofgrindingheat,resultinginlocalinstantaneoushightemperatureinthegrindingarea.Theinstantaneoustemperatureinthegrindingzoneis0.1-0.001and**is1000-1500(?)C.Derivation,calculationormeasurementofinstantaneoustemperatureunderexperimentalconditi***usinglinearmovingheatsourceheattransfertheory*formulaorinfraredandthermocouplemethods.Thisinstantaneoushightemperatureissufficienttocausehightemperatureoxidation,amorphousstructure,hightemperaturetempering,secondaryquenching,andevenfiringonacertainlevelofworkingsurface.（1）表面氧化层(1)Surfaceoxidelayer在徐州SKF轴承瞬间高温的作用下，钢表面与空气中的氧气反应，形成一层很薄（20-30）的氧化铁层。值得注意的是，氧化层的厚度对应于表面磨料变质层的总厚度。结果表明，氧化层厚度与磨削过程直接相关，是衡量磨削质量的重要指标。UndertheactionofinstantaneoushightemperatureofXuzhouSKFbearing,thesteelsurfacereactswithoxygenintheairtoformaverythin(20-30)layerofironoxide.Itisnoteworthythatthethicknessoftheoxidelayercorrespondstothetotalthicknessofthesurfaceabrasivemetamorphiclayer.Theresultsshowthattheoxidelayerthicknessisdirectlyrelatedtothegrindingprocessandisanimportantindextomeasurethegrindingquality.（2）非晶态结构层(2)Amorphousstructurelayer当工件表面在徐州SKF轴承磨削区瞬时高温下熔化时，熔化的金属分子流均匀地覆盖工作表面，以很快的速度冷凝母材，形成非常薄的非晶态结构。它有很高的硬度和韧性，但只有10左右。精*密磨削容易去除。WhentheworkpiecesurfacemeltsattheinstantaneoushightemperatureinthegrindingzoneofXuzhouSKFbearing,themoltenmetalmoleculeflowuniformlycoverstheworkingsurfaceandcondensesthebasemetalatafastspeed,formingaverythinamorphousstructure.Ithashighhardnessandtoughness,butonlyabout10.Precision*densegrindingiseasytoremove.（3）双淬火层(3)Doublequenchedlayer当磨削区的瞬时高温将工件表层加热到奥氏体化温度（1）以上时，在随后的冷凝过程中，该层的奥氏体化结构被重新淬火为马氏体。徐州SKF轴承二次淬火烧*伤的工件在二次淬火层下**须有一个硬度很低的高温回火层。Whentheinstantaneoushightemperatureinthegrindingzoneheatsthesurfacelayeroftheworkpieceabovetheaustenitizingtemperature(1),theaustenitizingstructureofthelayerisre-quenchedtomartensiteinthesubsequentcondensationprocess.TheworkpieceburnedbysecondaryquenchingofXuzhouSKFbearingmusth***eahightemperaturetemperinglayerwithverylowhardnessunderthesecondaryquenchinglayer.（4）磨削裂纹(4)GrindingCracks二次淬火烧*伤可以改变工件表面层的应力。当轴承识别出轴承的真假时，通过触摸轴承上的钢印，可以更快、更准确地识别徐州SKF轴承。如果你用手触摸***，它就没有任何接触。但是如果你用指甲轻轻地触摸***，你会感到***被压缩了。钢印下高温回火区的材料具有**大的拉应力，**有可能发生在此处。裂缝的核心。裂纹**容易沿原始奥氏体晶界扩展。严重烧*伤会导致整个磨削表面出现裂纹（主要是裂纹），导致工件报废。Secondaryquenchingburnscanchangethestressoftheworkpiecesurfacelayer.Whenbearingrecognizesthetrueorfalseofbearing,itcanrecognizeXuzhouSKFbearingmorequicklyandaccuratelybytouchingthesteelmarkonthebearing.Ifyoutouchthestampwithyourhand,ithasnocontact.Butifyoutouchthestampgentlywithyournails,youwillfeelthestampcompressed.Thematerialinhightemperaturetemperingzoneundersteelstamphas**largetensilestress,and**mayoccurhere.Thecoreofthecrack.Cracks**tendtopropagatealongtheoriginalaustenitegrainboundary.Severeburnswillleadtocracks(mainlycracks)onthewholegrindingsurface,leadingtothescrapoftheworkpiece.文章来自：徐州SKF轴承www.wh-Articlefrom:XuzhouSKFBearingwww.wh-文章来自：徐州INA轴承a-Articlefrom:XuzhouINABearinga-文章来自：徐州NSK轴承Articlefrom:XuzhouNSKBearing***：524085168电话：0510-81207777手机：13311666672/13395185757)