重庆理工材料成形技术基础课程课件双语PPT之6 Rolling of Metals.ppt

重庆理工材料成形技术基础课程课件双语PPT之6 Rolling of Metals.ppt

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材料科学与工程学院材料科学与工程学院CollegeofMaterialsScience&EngineeringPagePage11FundamentalofMaterialsForming-RollingofMetals金属轧制金属轧制材料科学与工程学院材料科学与工程学院CollegeofMaterialsScience&EngineeringPagePage22Rolling轧制轧制Rollingistheprocessofreducingthethickness（orchangingthecross-section）ofalongworkpiecebycompressiveforcesappliedthroughasetofrolls（Fig.13.1）;轧制是通过一些轧辊对一个长坯料进行加轧制是通过一些轧辊对一个长坯料进行加压使其厚度减薄或者界面形状发生变化的压使其厚度减薄或者界面形状发生变化的工艺。

工艺。

材料科学与工程学院材料科学与工程学院CollegeofMaterialsScience&EngineeringPagePage33Theprocessissimilartotherollingofdough（Theprocessissimilartotherollingofdough（面团）面团）witharollingpinwitharollingpin（擀面杖）（擀面杖）toreducetoreduceitsthickness.Rolling,whichaccountsforaboutitsthickness.Rolling,whichaccountsforabout90%ofallmetalsproducedbymetalworking90%ofallmetalsproducedbymetalworkingprocesses,wasfirstdevelopedinthelateprocesses,wasfirstdevelopedinthelate1500s.Thebasicoperationisflatrolling.1500s.Thebasicoperationisflatrolling.扁平扁平孔型轧制孔型轧制,orsimplyrolling,wheretherolled,orsimplyrolling,wheretherolledproductsareflatplateandsheet.productsareflatplateandsheet.材料科学与工程学院材料科学与工程学院CollegeofMaterialsScience&EngineeringPagePage44Sheetsaregenerallylessthan6mmthick.Theyareusedforautomobileandaircraftbodies,appliances（仪表）,foodandbeverages（饮料）containers,andkitchenandofficeequipment.appliancesTheextrusiondieisasteeldiskwithanopening,thesizeandshapeoftheintendedcross-sectionofthefinalextrudedproductasindicatedbelow.材料科学与工程学院材料科学与工程学院CollegeofMaterialsScience&EngineeringPagePage55Flat-andShape-RollingProcessesFigure13.1Schematicoutlineofvariousflat-andshape-rollingprocesses.Source:

AmericanIronandSteelInstitute.Slab钢板Hotstrip热轧带钢Pickling酸洗oiling润滑skelp制管钢板Pickling酸洗oling润滑bloom钢锭rail铁轨TuberoundsPlates:

t6mmSheets:

t0,andso|ex|ez|.Hence,atensionstressisgeneratedattheedges,tomakethelengthattheedgeequaltothatatthecenter.Thiscausesedgecracking,speciallyifductilityislow.Alligatoringoccursbyacomplexprocess.Aidedbydefectsintheoriginalcasting.xyz材料科学与工程学院材料科学与工程学院CollegeofMaterialsScience&EngineeringPagePage5050RESIDUALSTRESSESSmallerrollstendtoworkthemetalatthesurfaces.Themetalextendsonthesurface.Asthematerialcomesoutoftherolls,thecentralbulkregionputstheextendedsurfaceincompression.Thisissimilartowhatoccursduringshotpeening.Largediameterrolls（oftenusedinhotrolling）tendtoworkthecentralregionmorethanthebulk.Thisisbecauseofhigherfrictionatthesurfaces.Consequently,thematerialislongerinthebulkthanthesurface,andatensionstressisgeneratedatthesurface.材料科学与工程学院材料科学与工程学院CollegeofMaterialsScience&EngineeringPagePage5151FLATROLLINGPRACTICEUseofFlatteningRollsVariousRollArrangementsSendzimirMillforColdRollingofThinSheetsofHighStrengthMaterials材料科学与工程学院材料科学与工程学院CollegeofMaterialsScience&EngineeringPagePage5252SHAPEROLLING材料科学与工程学院材料科学与工程学院CollegeofMaterialsScience&EngineeringPagePage5353RINGROLLING材料科学与工程学院材料科学与工程学院CollegeofMaterialsScience&EngineeringPagePage5454THREADROLLING材料科学与工程学院材料科学与工程学院CollegeofMaterialsScience&EngineeringPagePage5555计算机在塑性成形加工中的应用计算机在塑性成形加工中的应用材料科学与工程学院材料科学与工程学院CollegeofMaterialsScience&EngineeringPagePage5656材料科学与工程学院材料科学与工程学院CollegeofMaterialsScience&EngineeringPagePage5757