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1、Unit1TheDieandMoldMaterialsand HeatTreatmentLesson1DieandMoldSteels1.1Lesson2ThePurposeofHeatTreatment1.2ReadingMaterials1CarbonSteelsandAlloySteels1.3ReadingMaterials2TypesofHeatTreatment1.41.1Lesson1DieandMoldSteelsThespecificmaterialselectedforaparticulardieormoldisnormallydeterminedbyth
2、emechanicalpropertiesnecessaryfortheproperoperationofthediesandmolds.Thesematerialsshouldbeselectedonlyafteracarefulstudyandevaluationofthefunctionsandrequirementsoftheproposedtool.Inmostapplications，morethanonetypeofmaterialwillbesatisfactory，andafinalchoicewillnormallybegovernedbytherequi
3、rementsfromcustomersfordiesandmolds,suchasperformanceandeconomicconsiderationsfordiesandmolds.Theprincipalmaterialsusedfordiesandmoldscanbedividedintotwomajorcategories：coldworktool(die)steelandhotworktool(mold)steel.Forexample,carbidesteel,alloytoolsteel,carbontoolsteel,high-speedsteel,hig
4、halloysteel,highcarbonsteel,lowcarbonsteel,shockresistancetoolsteelandsoon.Toproperlyselectadieormoldmaterial，thereareseveralphysicalandmechanicalpropertiesyoushouldunderstandtodeterminehowthematerialsyouselectwillaffectthefunctionandperformanceofthedieormold.[1]Physicalandmechanicalpropert
5、iesarethosecharacteristicsofamaterialwhichcontrolhowthematerialwillreactundercertainconditions.Physicalpropertiesarethosepropertieswhicharenaturalinthematerialandcannotbepermanentlyalteredwithoutchangingthematerialitself.Thesepropertiesinclude：weight,thermalandelectricalconductivity,rateoft
6、hermalexpansion,andmeltingpoint.Mechanicalpropertiesofamaterialarethosepropertieswhichcanbepermanentlyalteredbythermalormechanicaltreatment.Thesepropertiesinclude: strength,hardness,wearresistance,toughness,brittleness,plasticity,ductility,machinability,malleability,andmodulusofelasticity.F
7、romausestandpoint,dieandmoldsteelsareutilizedinworkingandshapingbasicmaterialssuchasmetalsandplasticsintodesiredforms.Fromausefulnessstandpoint,diesteelsareoftheperformancewhicharecapableofbeinghardenedandtemperedandwearresistance,highhardness,sufficient
