很好的模具设计专业英语课程PPT

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1、UnitThreeMoldConstructionsPassageOnePlasticsFormingandMoldsPassageTwoThree-plateInjectionMoldsPassageThreePressureCastingDiesPassageFourPiercingDieandBlankingDieDesignUnitThreeMoldConstructionsPassageOnePlasticsFormingandMolds11.GeneralThecontinuingdevelopmentofinjectionmoldtechnolo-gydemandsm

2、oreandmoreoftheprocesses.Themostimportantproblemintheprocessofinjectionmoldingisundoubtedlythecorrectdesignofinjectionmold，becausethemoldingshophaslittleinfluence，ifany，ontheconstructionofthemachine①.Efficientproductionofthemostdiverseinjection-moldedpartsdependsprimarilyontheinjectionmold.The

3、durabilityofthemoldsdependsontheircareandtreatment.Sincethemovingcomponentsandcavityofthemoldarealwayshardenedandground，theyshouldproducebetween500000and1000000000shots.UnitThreeMoldConstructionsForeaseofconstructionandtolowermanufacturingcost，injectionmoldsarebecomingstandardized.Somefirmsoff

4、erready-madebasesofsquareorrounddesignasstandardorstripperplatemoldsforimmediateuse.Onlytheinsertsthenhavetobefittedintothebases.2.BasicMoldConstruction（1）OperatingPrincipleBasicallytheinjectionmoldconsistsoftwohalves.Onemoldhalfcontainsthespruebushingandrunnersystem，theotherhalfhousestheeject

5、ionsystem.Themoldedpartislocatedatthepartingline（ref.ToDIN16700）.（2）SingleorMulticavityMoldsTosetupacalculationconceivingthechoiceofcavitiesinaninjectionmoldrequiresaccurateknowledgeofthematerialtobeUnitThreeMoldConstructionsprocessed，oftheinjection-moldingmachineandofthemolds.Themoldcostsincr

6、easewiththerisingnumberofcavitiesandtherelativemachinecostsdecrease.Theproductiontimerequiredforagivenmoldedpartdependsonthewallthickness，theinjectionspeed，therecoveryrate，thetimerequiredtocoolthemoldedmaterial，thecoolingcapacityofthemoldandthenecessaryincidentaltimesuchasdurationofpressurehol

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