很好的模具设计专业英语课程PPT.ppt

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1、UnitThreeMoldConstructionsPassageOnePlasticsFormingandMoldsPassageTwoThree-plateInjectionMoldsPassageThreePressureCastingDiesPassageFourPiercingDieandBlankingDieDesignUnitThreeMoldConstructionsPassageOnePlasticsFormingandMolds11.GeneralThecontinuingdevelopmentofinjectionmoldtechnolo-gydemands

2、moreandmoreoftheprocesses.Themostimportantproblemintheprocessofinjectionmoldingisundoubtedlythecorrectdesignofinjectionmold，becausethemoldingshophaslittleinfluence，ifany，ontheconstructionofthemachine①.Efficientproductionofthemostdiverseinjection-moldedpartsdependsprimarilyontheinjectionmold.T

3、hedurabilityofthemoldsdependsontheircareandtreatment.Sincethemovingcomponentsandcavityofthemoldarealwayshardenedandground，theyshouldproducebetween500000and1000000000shots.UnitThreeMoldConstructionsForeaseofconstructionandtolowermanufacturingcost，injectionmoldsarebecomingstandardized.Somefirms

4、offerready-madebasesofsquareorrounddesignasstandardorstripperplatemoldsforimmediateuse.Onlytheinsertsthenhavetobefittedintothebases.2.BasicMoldConstruction（1）OperatingPrincipleBasicallytheinjectionmoldconsistsoftwohalves.Onemoldhalfcontainsthespruebushingandrunnersystem，theotherhalfhousesthee

5、jectionsystem.Themoldedpartislocatedatthepartingline（ref.ToDIN16700）.（2）SingleorMulticavityMoldsTosetupacalculationconceivingthechoiceofcavitiesinaninjectionmoldrequiresaccurateknowledgeofthematerialtobeUnitThreeMoldConstructionsprocessed，oftheinjection-moldingmachineandofthemolds.Themoldcost

6、sincreasewiththerisingnumberofcavitiesandtherelativemachinecostsdecrease.Theproductiontimerequiredforagivenmoldedpartdependsonthewallthickness，theinjectionspeed，therecoveryrate，thetimerequiredtocoolthemoldedmaterial，thecoolingcapacityofthemoldandthenecessaryincidentaltimesuchasdurationofpress

7、ureholdingtime，ejectiontime，delaytime，etc.Thereforethedecisionconcerningthenumberofcavitiestobedetermineddependson:①sizeoftheorder（numberofmoldedpartsinconnec-tionwithdeliverytime）;②shapeofthemoldedparts（size，qualityrequire-ments）;UnitThreeMo