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1、Unit6TheFormingandMoldingEquipmentLesson14TypesofPress6.1Lesson15TheInjection-moldingMachine6.2Lesson16TheSpecificationsofPress6.3ReadingMaterials14MainComponentsofPress6.4Unit6TheFormingandMoldingEquipmentReadingMaterials15ComponentsofInjection-moldingMachine6.5ReadingMaterials16TheSpecificati
2、onsofInjection-moldingMachine6.66.1Lesson14TypesofPressFortheapplications,therearemanytypesofthepresses,suchasthesingle-actionstraight-slideeccentricmechanicalpress,punchpress,hydro-formerpress,hydraulicpress,pressbrake,triple-actionpress,turretpress,two-pointpress,twin-drivepress,twopointsingl
3、e-actionpress,watchpress,trimmingpress,closed-typesingle-actioncrankpress,knuckle-leverpress,one-pointsingle-actionpress,open-backinclinablepress,open-sidepress,four-pointpress,four-crankpress,flywheel-typescrewpress,frictionscrewpress,straight-sidesingle-actiondouble-crankpress,rocker-armpress
4、,screwpressandtop-drivesheet-metalstampingautomaticpressandsoon.Adouble-actionpressisusedforlarge,ordeepdrawingoperationsonsheetmetalparts．Thistypeofpresshasanouterram（blankholder）andasectioninnerram（punchholder）.Duringtheoperatingcycle,theblankholdercontactsthematerialfirstandappliespressureto
5、allowthepunchholdertoproperlydrawthepart(Figure6-1).Atriple-actionpresshasthesameinnerandouterramasthedouble-actionpress,butathirdraminthepressbedmovesupallowingareversedrawtobemadeinonepresscycle[1].Thetriple-actionpressisnotwidelyused．Aknucklepressisusedforcoiningoperation.Thedesignofthedrive
6、allowsforveryhighpressuresatthebottomoftheramstroke．Thistypeusesacrank,whichmovesajointconsistingoftwoleversthatoscillatetoandfromdeadcenterandresultsinashort,powerfulmovementoftheslidewithslowtravelnearthebottomofthestroke．Ahydraulicpressisusedbasicallyforformingoperationsandhasasloweroperatin
7、gcycletimethanmostmechanicalpresses.Theadvantagesofhydraulicpressesarethattheworkingpressure,stroke,andspeedoftheramareadjustable(Figure6-2).Hydraulicpressesbelongtotheforce-constrainedtypeofformingmachines.Theirmainuseisfoundinth
