外文翻译-- 注塑模具.doc

INJECTIONMOLDSABASICMOLDDESIGNANINJECTIONMOLDCONSISTSOFATLEASTTWOHALVESTHATAREFASTENEDTOTHETWOPLATENSOFTHEINJECTIONMOLDINGMACHINESOTHATTHEYCANBEOPENEDANDCLOSEDINTHECLOSEDPOSITION,THEPRODUCTFORMINGSURFACESOFTHETWOMOLDHALVESDEFINETHEMOLDCAVITYINTOWHICHTHEPLASTICMELTISINJECTEDVIATHERUNNERSYSTEMANDTHEGATECOOLINGPROVISIONSINTHEMOLDPROVIDEFORCOOLINGANDSOLIDIFICATIONOFTHEMOLDEDPRODUCTSOTHATITCANBESUBSEQUENTLYEJECTEDBTYPESOFEJECTIONFORPRODUCTEJECTIONTOOCCUR,THEMOLDMUSTOPENTHESHAPESOFTHEMOLDEDPRODUCTDETERMINESWHETHERITCANBEEJECTEDSIMPLYBYOPENINGTHETWOMOLDHALVESORWHETHERUNDERCUTSMUSTBEPRESENTTHEDESIGNOFAMOLDISDICTATEDPRIMARILYBYTHESHAPEOFTHEPRODUCTTOBEMOLDEDANDTHEPROVISIONSNECESSARYFORPRODUCTEJECTIONINJECTIONMOLDEDPRODUCTSCANBECLASSIFIEDAS○1PRODUCTSWITHOUTUNDERCUTSEG,PLAQUES,STRIPS,HALFSHELLS,CUPS○2PRODUCTSWITHEXTERNALUNDERCUTSORLATERALOPENINGSEG,SPOOLSANDBOBBINS,BEVERAGECRATES,THREADEDBOLTS○3PRODUCTSWITHINTERNALUNDERCUTSEG,THREADEDCLOSURES,HOUSINGS○4PRODUCTSWITHEXTERNALANDINTERNALUNDERCUTSEG,BU