模具专业英语课件-PPTUnit_Three

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1、UnitThreeMoldConstructionsPassageOnePlasticsFormingandMoldsPassageTwoThree-plateInjectionMoldsPassageThreePressureCastingDiesPassageFourPiercingDieandBlankingDieDesignUnitThreeMoldConstructionsPassageOnePlasticsFormingandMolds11.GeneralThecontinuingdevelopmentofinjectionmoldtechnolo-gyd

2、emandsmoreandmoreoftheprocesses.Themostimportantproblemintheprocessofinjectionmoldingisundoubtedlythecorrectdesignofinjectionmold，becausethemoldingshophaslittleinfluence，ifany，ontheconstructionofthemachine①.Efficientproductionofthemostdiverseinjection-moldedpartsdependsprimarilyontheinj

3、ectionmold.Thedurabilityofthemoldsdependsontheircareandtreatment.Sincethemovingcomponentsandcavityofthemoldarealwayshardenedandground，theyshouldproducebetween500000and1000000000shots.UnitThreeMoldConstructionsForeaseofconstructionandtolowermanufacturingcost，injectionmoldsarebecomingstan

4、dardized.Somefirmsofferready-madebasesofsquareorrounddesignasstandardorstripperplatemoldsforimmediateuse.Onlytheinsertsthenhavetobefittedintothebases.2.BasicMoldConstruction（1）OperatingPrincipleBasicallytheinjectionmoldconsistsoftwohalves.Onemoldhalfcontainsthespruebushingandrunnersyste

5、m，theotherhalfhousestheejectionsystem.Themoldedpartislocatedatthepartingline（ref.ToDIN16700）.（2）SingleorMulticavityMoldsTosetupacalculationconceivingthechoiceofcavitiesinaninjectionmoldrequiresaccurateknowledgeofthematerialtobeUnitThreeMoldConstructionsprocessed，oftheinjection-moldingma

6、chineandofthemolds.Themoldcostsincreasewiththerisingnumberofcavitiesandtherelativemachinecostsdecrease.Theproductiontimerequiredforagivenmoldedpartdependsonthewallthickness，theinjectionspeed，therecoveryrate，thetimerequiredtocoolthemoldedmaterial，thecoolingcapacityofthemoldandthenecessar

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