轧辊的磨损精品文稿.ppt

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1、轧辊的磨损第1页，本讲稿共25页WEAR in HSMWEAR in HSM CLASSIFICATION of WEAR ABRASIVE WEAR ADHESIVE WEAR FATIGUE WEAR CHEMICAL WEARICR&DDEPTLOSS of TOOL MATERIALLOSS of TOOL MATERIALduring DEFORMATIONduring DEFORMATIONSKETCHS of MECHANISMSSKETCHS of MECHANISMS第2页，本讲稿共25页WEAR in HSM ABRASIVE WEARICR&DDEPTREMOVAL of

2、 MATERIAL by HARD ASPERITY(2-body wear)by HARD ASPERITY(2-body wear)by PARTILES LOCATED between 2 SURFACES(3-body wear)by PARTILES LOCATED between 2 SURFACES(3-body wear)MECHANISM AFFECTS by ROLL HARDNESSOXIDE SCALEOXIDE SCALECarbon(%)Carbon(%)1 2 3第3页，本讲稿共25页WEAR in HSM ADHESIVE WEARICR&DDEPT JUNCT

3、IONS(MICRO WELDING)GENERATED by PLASTIC DEFORMATIONof ASPERITY SEPARATION or BREAKINGMAY LEAD LOSS of MATERIAL MECHANISM AFFECTS by CONTACT COMPATIBILITY of SURFACES 第4页，本讲稿共25页WEAR in HSM FATIGUE WEARICR&DDEPTCYCLICAL LOADINGMECHANICALmicrocracksdelamination(flat sheet-like particle detachment)(fla

4、t sheet-like particle detachment)THERMALcrackscracksfirecrack patternPITTING,SPALLING第5页，本讲稿共25页WEAR in HSM CHEMICAL WEARICR&DDEPTLOSS of MATERIAL due todue toTRIBOCHEMICAL REACTIONSROLLROLLSTRIPSTRIPLUBRIFICANTLUBRIFICANTENVIRONMENTENVIRONMENT第6页，本讲稿共25页WEAR in HSM ROLL WEARICR&DDEPTCOMPLEX PHENOME

5、NONSEVERAL MECHANISM ACTINGat the SAME TIMECORROSIONCORROSIONTHERMAL FATIGUETHERMAL FATIGUEABRASIONABRASIONMECHANICAL FATIGUEMECHANICAL FATIGUE第7页，本讲稿共25页WEAR in HSM ROLL WEARICR&DDEPTROLLING PARAMETERS 第8页，本讲稿共25页WEAR in HSM FACTORS INFLUENCING ROLL WEARICR&DDEPTFRICTIONFRICTIONHOT-ROLLED STEELHOT-

6、ROLLED STEELLOADS&STRESSESLOADS&STRESSESROLL MATERIALROLL MATERIALCOOLING&LUBRICATIONCOOLING&LUBRICATION第9页，本讲稿共25页WEAR in HSM HOT-ROLLED STEELICR&DDEPTCHEMISTRY&MECHANICAL PROPERTIESCHEMISTRY&MECHANICAL PROPERTIESHAVE a STRONG EFFECT on WEARDEFORMATION RESISTANCEDEFORMATION RESISTANCEWEARTEMPERATUR

7、E CONTROLS GROWTH&TYPEof OXIDE SCALE第10页，本讲稿共25页WEAR in HSM HOT-ROLLED STEELTERTIARY SCALE in FINISHING GROUPTERTIARY SCALE in FINISHING GROUPICR&DDEPTCONTROLLING STRIP TEMEPERATUREbelow 950C IMPROVES ROLL PERFORMANCEbelow 950C IMPROVES ROLL PERFORMANCEFeO ACTS AS A LUBRIFICANTFeO ACTS AS A LUBRIFIC

8、ANTTHERMAL FATIGUETHERMAL FATIGUEOXIDE FILM STABILITYOXIDE FILM STABILITYon ROLL SURFACEon ROLL SURFACE第11页，本讲稿共25页WEAR in HSMWEAR in HSM ICR&DDEPTbut another theory existsalso LOOKED in LABORATORY TESTSWEAR SHOWS a MAXIMUM at 900-950CWEAR SHOWS a MAXIMUM at 900-950CAbove 950C Above 950C SCALE SHEAR

9、S INTERNALLY:SCALE SHEARS INTERNALLY:WEAR&FRICTION DECREASEWEAR&FRICTION DECREASEBelow 950C Below 950C WEAR INCREASE with TEMPERATURE:WEAR INCREASE with TEMPERATURE:ROLL SOFTENING&HARDER SCALEROLL SOFTENING&HARDER SCALEHOT-ROLLED STEELTERTIARY SCALE in FINISHING GROUPTERTIARY SCALE in FINISHING GROU

10、P第12页，本讲稿共25页WEAR in HSMWEAR in HSM LOADS&STRESSESICR&DDEPTWEAR RATE is DIRECTLY PROPORTIONALto NORMAL PRESSURE on ROLL SURFACEROLLING PRESSURE RANGE ROLLING PRESSURE RANGE 100-300 MPa100-300 MPaCYCLIC STRESSES(also THERMAL)CYCLIC STRESSES(also THERMAL)500 MPaIRREGULAR PRESSURE DISTRIBUTIONIRREGULAR

11、 PRESSURE DISTRIBUTIONNON UNIFORM WEARNON UNIFORM WEAR第13页，本讲稿共25页WEAR in HSMWEAR in HSM FRICTIONICR&DDEPTNEEDFUL to ROLLINGNEEDFUL to ROLLING ESTABILISH the ROLLING POWER CONSUMPTIONESTABILISH the ROLLING POWER CONSUMPTIONIMPORTANT for STRIP SURFACE QUALITYIMPORTANT for STRIP SURFACE QUALITY REDUCT

12、IONREDUCTIONTEMPERATURETEMPERATUREROLLING SPEEDROLLING SPEED ROUGHNESSROUGHNESS第14页，本讲稿共25页WEAR in HSM FRICTION&REDUCTIONICR&DDEPTTHERE IS a SLIGHT DIRECT CONNECTIONTHERE IS a SLIGHT DIRECT CONNECTIONSURFACE CONDITION INFLUENCESURFACE CONDITION INFLUENCETHIS RELATIONSHIPTHIS RELATIONSHIPFRICTION&ROL

13、LING SPEEDGENERALLY GENERALLY DECREASES with an INCREASE DECREASES with an INCREASEin ROLLING SPEEDin ROLLING SPEEDbutbutROLLING SPEED AFFECTS STRAIN HARDENINGROLLING SPEED AFFECTS STRAIN HARDENINGof STEEL ALSOof STEEL ALSO第15页，本讲稿共25页WEAR in HSM FRICTION&TEMPERATUREICR&DDEPTTHERE ARE RESULTS in DIS

14、AGREEMENTT CaT Cb fTa-Speed=3 m/s b-Speed=0.5 m/sa-Speed=3 m/s b-Speed=0.5 m/sOXIDE SCALE PLAYS A ROLE VERY IMPORTANTOXIDE SCALE PLAYS A ROLE VERY IMPORTANT第16页，本讲稿共25页WEAR in HSMWEAR in HSM FRICTION&ROUGHNESSICR&DDEPT INCREASE with ROLL ROUGHNESSFRICTION IS CORRELATED to DEFORMATION WORK GENERATEDi

15、n ASPERITY SMOOTHING第17页，本讲稿共25页WEAR in HSM FRICTION&ROLL MATERIALSICR&DDEPTCARBIDES AMOUNTCARBIDES AMOUNTCARBIDES TYPECARBIDES TYPEHARDNESSHARDNESS CARBIDES SHAPECARBIDES SHAPE第18页，本讲稿共25页WEAR in HSMWEAR in HSM FRICTION&ROLL MATERIALSICR&DDEPT DECREASES as the TOTAL CARBIDEFRACTION INCREASESMC CARB

16、IDES MAY LEAD HIGHERMC CARBIDES MAY LEAD HIGHERFRICTION COEFFICIENT(SPIKE EFFECT)(SPIKE EFFECT)第19页，本讲稿共25页WEAR in HSM FRICTION&ROLL MATERIALSICR&DDEPTHSS HCrIm of these MATERIALS DIFFERGenarally HSS shows a frictionup to 30%higher but 第20页，本讲稿共25页WEAR in HSM FRICTION&ROLL MATERIALSICR&DDEPTthe way

17、to reduce of HSS exists50 mLow amountof MC Carbides10-11%of Carbidesmainly M2CMICROSTRUCTURE of LOW FRICTION HSSMICROSTRUCTURE of LOW FRICTION HSS第21页，本讲稿共25页WEAR in HSM FRICTION&ROLL MATERIALSICR&DDEPTLABORATORY RESULTSLABORATORY RESULTS0.40-0.46第22页，本讲稿共25页WEAR in HSMWEAR in HSM COOLING&LUBRICATIO

18、NICR&DDEPTCOOLINGCONNECTED with THERMAL FATIGUE DAMAGESLUBRICATIONCONNECTED with a LOWERING in FRICTIONFor both systemsFor both systemsEFFICIENCY&WORKING REGULARITYGIVE a LONGER ROLL LIFE第23页，本讲稿共25页WEAR in HSM ROLL MATERIALSICR&DDEPTGOODWEAR RESISTANCEHIGH HARDNESS(CARBIDES&MATRIX)(CARBIDES&MATRIX)LOW FRICTIONLOW SURFACE ROUGHNESSLOW CRACKINGLOW CRACKINGSENSITIVITYSENSITIVITY第24页，本讲稿共25页WEAR in HSM ICR&DDEPTROLL MATERIAL MAY SHOW an EXCELLENTWEAR RESISTANT but the ROLLCONSUMPTION ITS HEAVY CONTROLLEDby SPECIFIC MILL CONDITIONS第25页，本讲稿共25页