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1、Unit5ThePartsforDiesandMoldsLesson10DiePart—StockStop5.1Lesson11PlasticInjectionMoldParts5.2Lesson12StandardDie&MoldBase5.3Lesson13TypesofInjection-molding5.4Unit5ThePartsforDiesandMoldsReadingMaterials10Pilots5.5ReadingMaterials11DesignofGuidesforthePartstoBeMolded5.65.75
2、.8ReadingMaterials12KnockoutBarsReadingMaterials13TheEconomicsofInjection-moldingProducts5.1Lesson10DiePart—StockStopFigure5-1Adjustableblockstopforablankingdie1—Adjustablesolidblockstop2—SupportbarThereareseveralkindsofstockstopsinthevariousdies.Astockstopmaybeapinorsmall
3、blockagainstwhichanedgeofthepreviouslyblankedopeningispushedaftereachstrokeofthepress.Withsufficientclearanceinthestockchannel,thestockismomentarilyliftedbyitsclingingtothepunch,andisthusreleasedfromthestop.Figure5-1showsanadjustabletypeofsolidblockstopwhichcanbemovedalong
4、asupportbarinincrementslipto25.4mmtoallowvariousstocklengthstobecutoff.Astartingstopisusedtopositionstockasitisinitiallyfedtoadie,Mountedontheguideplate,thestopincorporatesalatchwhichispushedinwardbytheoperatoruntilitsshouldercontactstheguideplate.Thelatchisheldintoengaget
5、heedgeoftheincomingstock,andthefirstdieoperationiscompleted,thenthelatchisreleased.Theuppershoeandlowershoeareguidedbyguideplate,andthefirstpositioniscompletedbythefixedstockstoppin6whenfeed-instartsandaccuratepositioniscompletedbytheguidepin5,asshowninFigure5-2.Inordertoe
6、nsuretheaccuratedistanceoffirstmaterial,astartingstockstoppiniscommonlyusedinaprogressivediewithaguidepin.Afterfirstmaterial,itwillbepositionedbythefixedstockstoppin6.InFigure5-3,itisaguideplateblankingdie.Thereisaclearancefitbetweenthepunch5andguideplate9(alsofixedstrippe
7、r),anditsfitvalueissmallerthantheblankingclearance,sothepositioniscompletedbetweenupperandlowerpartsofdie.Inreturnstroke,itdon’tpermitthepunchpartingwithguideplate,andensuretheguidefunction,soasmallerstrokeisrequiredforapress.5.2Lesson11PlasticInjectionMoldPartsFigure5-4sh
8、owsacross-sectionviewoftheelementsofatypicalthree-plate,pin-pointgateinjectionmold.Abrief
