轧辊的磨损幻灯片.ppt

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1、轧辊的磨损第1页，共25页，编辑于2022年，星期二WEAR in HSM CLASSIFICATION of WEAR ABRASIVE WEAR ADHESIVE WEAR FATIGUE WEAR CHEMICAL WEARICR&DDEPTLOSS of TOOL MATERIALduring DEFORMATIONduring DEFORMATIONSKETCHS of MECHANISMSSKETCHS of MECHANISMS第2页，共25页，编辑于2022年，星期二WEAR in HSM ABRASIVE WEARICR&DDEPTREMOVAL of MATERIAL by

2、 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，共25页，编辑于2022年，星期二WEAR in HSM ADHESIVE WEARICR&DDEPT JUNCTIO

3、NS(MICRO WELDING)GENERATED by PLASTIC DEFORMATIONof ASPERITY SEPARATION or BREAKINGMAY LEAD LOSS of MATERIAL MECHANISM AFFECTS by CONTACT COMPATIBILITY of SURFACES 第4页，共25页，编辑于2022年，星期二WEAR in HSM FATIGUE WEARICR&DDEPTCYCLICAL LOADINGMECHANICALmicrocracksdelamination(flat sheet-like particle detachm

4、ent)(flat sheet-like particle detachment)THERMALcracksfirecrack patternPITTING,SPALLING第5页，共25页，编辑于2022年，星期二WEAR in HSM CHEMICAL WEARICR&DDEPTLOSS of MATERIAL due toTRIBOCHEMICAL REACTIONSROLLROLLSTRIPSTRIPLUBRIFICANTLUBRIFICANTENVIRONMENTENVIRONMENT第6页，共25页，编辑于2022年，星期二WEAR in HSM ROLL WEARICR&DDEP

5、TCOMPLEX PHENOMENONSEVERAL MECHANISM ACTINGat the SAME TIMECORROSIONCORROSIONTHERMAL FATIGUETHERMAL FATIGUEABRASIONABRASIONMECHANICAL FATIGUEMECHANICAL FATIGUE第7页，共25页，编辑于2022年，星期二WEAR in HSM ROLL WEARICR&DDEPTROLLING PARAMETERS 第8页，共25页，编辑于2022年，星期二WEAR in HSM FACTORS INFLUENCING ROLL WEARICR&DDEPT

6、FRICTIONFRICTIONHOT-ROLLED STEELHOT-ROLLED STEELLOADS&STRESSESLOADS&STRESSESROLL MATERIALROLL MATERIALCOOLING&LUBRICATIONCOOLING&LUBRICATION第9页，共25页，编辑于2022年，星期二WEAR in HSM HOT-ROLLED STEELICR&DDEPTCHEMISTRY&MECHANICAL PROPERTIESHAVE a STRONG EFFECT on WEARDEFORMATION RESISTANCEDEFORMATION RESISTANC

7、EWEARTEMPERATURE CONTROLS GROWTH&TYPEof OXIDE SCALE第10页，共25页，编辑于2022年，星期二WEAR in HSM HOT-ROLLED STEELTERTIARY SCALE in FINISHING GROUPTERTIARY SCALE in FINISHING GROUPICR&DDEPTCONTROLLING STRIP TEMEPERATUREbelow 950C IMPROVES ROLL PERFORMANCEFeO ACTS AS A LUBRIFICANTFeO ACTS AS A LUBRIFICANTTHERMAL

8、FATIGUETHERMAL FATIGUEOXIDE FILM STABILITYOXIDE FILM STABILITYon ROLL SURFACEon ROLL SURFACE第11页，共25页，编辑于2022年，星期二WEAR in HSM ICR&DDEPTbut another theory existsalso LOOKED in LABORATORY TESTSWEAR SHOWS a MAXIMUM at 900-950CAbove 950C Above 950C SCALE SHEARS INTERNALLY:SCALE SHEARS INTERNALLY:WEAR&FR

9、ICTION 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 GROUP第12页，共25页，编辑于2022年，星期二WEAR in HSM LOADS&STR

10、ESSESICR&DDEPTWEAR RATE is DIRECTLY PROPORTIONALto NORMAL PRESSURE on ROLL SURFACEROLLING PRESSURE RANGE ROLLING PRESSURE RANGE 100-300 MPaCYCLIC STRESSES(also THERMAL)CYCLIC STRESSES(also THERMAL)500 MPaIRREGULAR PRESSURE DISTRIBUTIONIRREGULAR PRESSURE DISTRIBUTIONNON UNIFORM WEARNON UNIFORM WEAR第1

11、3页，共25页，编辑于2022年，星期二WEAR in HSM FRICTIONICR&DDEPTNEEDFUL to ROLLING ESTABILISH the ROLLING POWER CONSUMPTIONESTABILISH the ROLLING POWER CONSUMPTIONIMPORTANT for STRIP SURFACE QUALITY REDUCTIONREDUCTIONTEMPERATURETEMPERATUREROLLING SPEEDROLLING SPEED ROUGHNESSROUGHNESS第14页，共25页，编辑于2022年，星期二WEAR in H

12、SM FRICTION&REDUCTIONICR&DDEPTTHERE IS a SLIGHT DIRECT CONNECTIONTHERE IS a SLIGHT DIRECT CONNECTIONSURFACE CONDITION INFLUENCETHIS RELATIONSHIPFRICTION&ROLLING SPEEDGENERALLY GENERALLY DECREASES with an INCREASEin ROLLING SPEEDbutbutROLLING SPEED AFFECTS STRAIN HARDENINGROLLING SPEED AFFECTS STRAIN

13、 HARDENINGof STEEL ALSOof STEEL ALSO第15页，共25页，编辑于2022年，星期二WEAR in HSM FRICTION&TEMPERATUREICR&DDEPTTHERE ARE RESULTS in DISAGREEMENTT 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，共25页，编辑于2022年，星期

14、二WEAR in HSM FRICTION&ROUGHNESSICR&DDEPT INCREASE with ROLL ROUGHNESSFRICTION IS CORRELATED to DEFORMATION WORK GENERATEDin ASPERITY SMOOTHING第17页，共25页，编辑于2022年，星期二WEAR in HSM FRICTION&ROLL MATERIALSICR&DDEPTCARBIDES AMOUNTCARBIDES AMOUNTCARBIDES TYPECARBIDES TYPEHARDNESSHARDNESS CARBIDES SHAPECARBI

15、DES SHAPE第18页，共25页，编辑于2022年，星期二WEAR in HSM FRICTION&ROLL MATERIALSICR&DDEPT DECREASES as the TOTAL CARBIDEFRACTION INCREASESMC CARBIDES MAY LEAD HIGHERFRICTION COEFFICIENT(SPIKE EFFECT)(SPIKE EFFECT)第19页，共25页，编辑于2022年，星期二WEAR in HSM FRICTION&ROLL MATERIALSICR&DDEPTHSS HCrIm of these MATERIALS DIFFER

16、Genarally HSS shows a frictionup to 30%higher but 第20页，共25页，编辑于2022年，星期二WEAR in HSM FRICTION&ROLL MATERIALSICR&DDEPTthe way to reduce of HSS exists50 mLow amountof MC Carbides10-11%of Carbidesmainly M2CMICROSTRUCTURE of LOW FRICTION HSSMICROSTRUCTURE of LOW FRICTION HSS第21页，共25页，编辑于2022年，星期二WEAR in

17、HSM FRICTION&ROLL MATERIALSICR&DDEPTLABORATORY RESULTS0.40-0.46第22页，共25页，编辑于2022年，星期二WEAR in HSM COOLING&LUBRICATIONICR&DDEPTCOOLINGCONNECTED with THERMAL FATIGUE DAMAGESLUBRICATIONCONNECTED with a LOWERING in FRICTIONFor both systemsFor both systemsEFFICIENCY&WORKING REGULARITYGIVE a LONGER ROLL LI

18、FE第23页，共25页，编辑于2022年，星期二WEAR in HSM ROLL MATERIALSICR&DDEPTGOODWEAR RESISTANCEHIGH HARDNESS(CARBIDES&MATRIX)(CARBIDES&MATRIX)LOW FRICTIONLOW SURFACE ROUGHNESSLOW CRACKINGSENSITIVITY第24页，共25页，编辑于2022年，星期二WEAR in HSM ICR&DDEPTROLL MATERIAL MAY SHOW an EXCELLENTWEAR RESISTANT but the ROLLCONSUMPTION ITS HEAVY CONTROLLEDby SPECIFIC MILL CONDITIONS第25页，共25页，编辑于2022年，星期二