轧辊的磨损课件

Fare clic per modificare lo stile del titolo dello schema,Fare clic per modificare gli stili del testo dello schema,Secondo livello,Terzo livello,Quarto livello,Quinto livello,*,WEAR in HSM,CLASSIFICATION of WEAR,ABRASIVE WEAR,ADHESIVE WEAR,FATIGUE WEAR,CHEMICAL WEAR,IC,R&D,DEPT,LOSS of TOOL MATERIAL,during DEFORMATION,SKETCHS of MECHANISMS,WEAR in HSM CLASSIFICATION of,1,WEAR in HSM,ABRASIVE WEAR,IC,R&D,DEPT,REMOVAL of MATERIAL,by HARD ASPERITY(2-body wear),by PARTILES LOCATED between 2 SURFACES(3-body wear),MECHANISM AFFECTS by ROLL HARDNESS,OXIDE SCALE,Carbon(%),1 2 3,WEAR in HSM ABRASIVE WEARICR&D,2,WEAR in HSM,ADHESIVE WEAR,IC,R&D,DEPT,JUNCTIONS(MICRO WELDING),GENERATED by PLASTIC DEFORMATION,of ASPERITY,SEPARATION or BREAKING,MAY LEAD LOSS of MATERIAL,MECHANISM AFFECTS,by,CONTACT COMPATIBILITY of SURFACES,WEAR in HSM ADHESIVE WEARICR&D,3,WEAR in HSM,FATIGUE WEAR,IC,R&D,DEPT,CYCLICAL LOADING,MECHANICAL,microcracks,delamination,(flat sheet-like particle detachment),THERMAL,cracks,firecrack pattern,PITTING,SPALLING,WEAR in HSM FATIGUE WEARICR&DC,4,WEAR in HSM,CHEMICAL WEAR,IC,R&D,DEPT,LOSS of MATERIAL,due to,TRIBOCHEMICAL REACTIONS,ROLL,STRIP,LUBRIFICANT,ENVIRONMENT,WEAR in HSM CHEMICAL WEARICR&D,5,WEAR in HSM,ROLL WEAR,IC,R&D,DEPT,COMPLEX PHENOMENON,SEVERAL MECHANISM ACTING,at the SAME TIME,CORROSION,THERMAL FATIGUE,ABRASION,MECHANICAL FATIGUE,WEAR in HSM ROLL WEARICR&DCOMP,6,WEAR in HSM,ROLL WEAR,IC,R&D,DEPT,ROLLING PARAMETERS,WEAR in HSM ROLL WEARICR&DROLL,7,WEAR in HSM,FACTORS INFLUENCING,ROLL WEAR,IC,R&D,DEPT,FRICTION,HOT-ROLLED STEEL,LOADS&STRESSES,ROLL MATERIAL,COOLING&LUBRICATION,WEAR in HSM FACTORS INFLUENCIN,8,WEAR in HSM,HOT-ROLLED STEEL,IC,R&D,DEPT,CHEMISTRY&MECHANICAL PROPERTIES,HAVE a STRONG EFFECT on WEAR,DEFORMATION RESISTANCE,WEAR,TEMPERATURE CONTROLS GROWTH&TYPE,of OXIDE SCALE,WEAR in HSM HOT-ROLLED STEELIC,9,WEAR in HSM,HOT-ROLLED STEEL,TERTIARY SCALE in FINISHING GROUP,IC,R&D,DEPT,CONTROLLING STRIP TEMEPERATURE,below 950C IMPROVES ROLL PERFORMANCE,FeO ACTS AS A LUBRIFICANT,THERMAL FATIGUE,OXIDE FILM STABILITY,on ROLL SURFACE,WEAR in HSM HOT-ROLLED STEELIC,10,WEAR in HSM,IC,R&D,DEPT,but another theory exists,also LOOKED in LABORATORY TESTS,WEAR SHOWS a MAXIMUM at 900-950C,Above 950C,SCALE SHEARS INTERNALLY:,WEAR&FRICTION DECREASE,Below 950C,WEAR INCREASE with TEMPERATURE:,ROLL SOFTENING&HARDER SCALE,HOT-ROLLED STEEL,TERTIARY SCALE in FINISHING GROUP,WEAR in HSM ICR&Dbut another t,11,WEAR in HSM,LOADS&STRESSES,IC,R&D,DEPT,WEAR RATE is DIRECTLY PROPORTIONAL,to NORMAL PRESSURE on ROLL SURFACE,ROLLING PRESSURE RANGE,100-300 MPa,CYCLIC STRESSES(also THERMAL),500 MPa,IRREGULAR PRESSURE DISTRIBUTION,NON UNIFORM WEAR,WEAR in HSM LOADS&STRESSESIC,12,WEAR in HSM,FRICTION,IC,R&D,DEPT,NEEDFUL to ROLLING,ESTABILISH the ROLLING POWER CONSUMPTION,IMPORTANT for STRIP SURFACE QUALITY,REDUCTION,TEMPERATURE,ROLLING SPEED,m,ROUGHNESS,WEAR in HSM FRICTIONICR&DNEEDF,13,WEAR in HSM,FRICTION&REDUCTION,IC,R&D,DEPT,THERE IS a SLIGHT DIRECT CONNECTION,SURFACE CONDITION INFLUENCE,THIS RELATIONSHIP,FRICTION&ROLLING SPEED,GENERALLY,m,DECREASES with an INCREASE,in ROLLING SPEED,but,ROLLING SPEED AFFECTS STRAIN HARDENING,of STEEL ALSO,WEAR in HSM FRICTION&REDUCTI,14,WEAR in HSM,FRICTION&TEMPERATURE,IC,R&D,DEPT,THERE ARE RESULTS in DISAGREEMENT,T C,a,T C,b,fT,a-Speed=3 m/s b-Speed=0.5 m/s,OXIDE SCALE PLAYS A ROLE VERY IMPORTANT,WEAR in HSM FRICTION&TEMPERA,15,WEAR in HSM,FRICTION&ROUGHNESS,IC,R&D,DEPT,m,INCREASE with ROLL ROUGHNESS,FRICTION IS CORRELATED,to DEFORMATION WORK GENERATED,in ASPERITY SMOOTHING,WEAR in HSM FRICTION&ROUGHNE,16,WEAR in HSM,FRICTION&ROLL MATERIALS,IC,R&D,DEPT,CARBIDES AMOUNT,CARBIDES TYPE,HARDNESS,m,CARBIDES SHAPE,WEAR in HSM FRICTION&ROLL MA,17,WEAR in HSM,FRICTION&ROLL MATERIALS,IC,R&D,DEPT,m,DECREASES as the TOTAL CARBIDE,FRACTION INCREASES,MC CARBIDES MAY LEAD HIGHER,FRICTION COEFFICIENT,(SPIKE EFFECT),WEAR in HSM FRICTION&ROLL MA,18,WEAR in HSM,FRICTION&ROLL MATERIALS,IC,R&D,DEPT,HSS HCrI,of these MATERIALS DIFFER,Genarally HSS shows a friction,up to 30%higher but,WEAR in HSM FRICTION&ROLL MA,19,WEAR in HSM,FRICTION&ROLL MATERIALS,IC,R&D,DEPT,the way to reduce,m,of HSS exists,50,m,m,Low amount,of MC Carbides,10-11%of Carbides,mainly M,2,C,MICROSTRUCTURE of LOW FRICTION HSS,WEAR in HSM FRICTION&ROLL MA,20,WEAR in HSM,FRICTION&ROLL MATERIALS,IC,R&D,DEPT,LABORATORY RESULTS,0.40-0.46,WEAR in HSM FRICTION&ROLL MA,21,WEAR in HSM,COOLING&LUBRICATION,IC,R&D,DEPT,COOLING,CONNECTED with THERMAL FATIGUE DAMAGES,LUBRICATION,CONNECTED with a LOWERING in FRICTION,For both systems,EFFICIENCY&WORKING REGULARITY,GIVE a LONGER ROLL LIFE,WEAR in HSM COOLING&LUBRICAT,22,WEAR in HSM,ROLL MATERIALS,IC,R&D,DEPT,GOOD,WEAR RESISTANCE,HIGH HARDNESS,(CARBIDES&MATRIX),LOW FRICTION,LOW SURFACE ROUGHNESS,LOW CRACKING,SENSITIVITY,WEAR in HSM ROLL MATERIALSICR&,23,WEAR in HSM,IC,R&D,DEPT,ROLL MATERIAL,MAY SHOW an,EXCELLENT,WEAR RESISTANT,but the,ROLL,CONSUMPTION ITS HEAVY CONTROLLED,by SPECIFIC MILL CONDITIONS,WEAR in H