轧辊的磨损精.ppt

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1、轧辊的磨损第1页，本讲稿共25页WEAR 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 MATERIAL b

2、y 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 JUNCTIONS(MICRO

3、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)(flat sheet-lik

4、e particle detachment)THERMALcracksfirecrack 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 PHENOMENONSEVERAL MECHAN

5、ISM 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-ROLLED STEELLOADS

6、&STRESSESLOADS&STRESSESROLL MATERIALCOOLING&LUBRICATIONCOOLING&LUBRICATION第9页，本讲稿共25页WEAR in HSM HOT-ROLLED STEELICR&DDEPTCHEMISTRY&MECHANICAL PROPERTIESHAVE a STRONG EFFECT on WEARDEFORMATION RESISTANCEDEFORMATION RESISTANCEWEARTEMPERATURE CONTROLS GROWTH&TYPEof OXIDE SCALE第10页，本讲稿共25页WEAR in HSM H

7、OT-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 FATIGUETHERMAL FATIGUEOXIDE FILM STABILITYOXIDE FILM STABILITYon ROLL SURFACEon ROLL S

8、URFACE第11页，本讲稿共25页WEAR 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 SHEARS INTERNALLY:SCALE SHEARS INTERNALLY:WEAR&FRICTION DECREASEWEAR&FRICTION DECREASEBelow 950C Below 950C WEAR

9、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，本讲稿共25页WEAR in HSM LOADS&STRESSESICR&DDEPTWEAR RATE is DIRECTLY PROPORTIONALto NORMAL PRESSURE on ROLL

10、 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13页，本讲稿共25页WEAR in HSM FRICTIONICR&DDEPTNEEDFUL to ROLLING ESTABILISH the R

11、OLLING POWER CONSUMPTIONIMPORTANT for STRIP SURFACE QUALITY REDUCTIONREDUCTIONTEMPERATURETEMPERATUREROLLING SPEEDROLLING SPEED ROUGHNESSROUGHNESS第14页，本讲稿共25页WEAR in HSM FRICTION&REDUCTIONICR&DDEPTTHERE IS a SLIGHT DIRECT CONNECTIONSURFACE CONDITION INFLUENCESURFACE CONDITION INFLUENCETHIS RELATIONSH

12、IPTHIS RELATIONSHIPFRICTION&ROLLING SPEEDGENERALLY GENERALLY DECREASES with an INCREASE DECREASES with an INCREASEin ROLLING SPEEDin ROLLING SPEEDbutROLLING SPEED AFFECTS STRAIN HARDENINGROLLING SPEED AFFECTS STRAIN HARDENINGof STEEL ALSO第15页，本讲稿共25页WEAR in HSM FRICTION&TEMPERATUREICR&DDEPTTHERE ARE

13、 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，本讲稿共25页WEAR in HSM FRICTION&ROUGHNESSICR&DDEPT INCREASE with ROLL ROUGHNESSFRICTION IS CORRELATED to DEFORMATION WORK GENERA

14、TEDin 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 HSM FRICTION&ROLL MATERIALSICR&DDEPT DECREASES as the TOTAL CARBIDEFRACTION INCREASESMC CARBIDES MA

15、Y 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 to reduce of HSS exists50 mLow amo

16、untof 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 HSM COOLING&LUBRICATIONICR&DDEPTCOOLINGCONNECTED with THERMAL FATIG

17、UE DAMAGESLUBRICATIONCONNECTED with a LOWERING in FRICTIONFor 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 CRACKINGSENSITIVITY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