Umgaqo wokubumba inaliti yokungunda kwe-carbide enesamente Kukho umngxuma wokuxheshisela kumngundo, odityaniswe kumgodi wokungunda wenaliti evaliweyo ngenkqubo yokungena ekungundeni. Xa usebenza, kufuneka uqale wongeze into eqinileyo yokubumba kwindawo yokutya kwaye uyifudumeze ukuyiguqula ibe yimeko yokuqukuqela kwe-viscous. Emva koko sebenzisa i-plunger ekhethekileyo ukuze ucinezele iplastiki inyibilika kwindawo yokutya kwi-press, ukuze i-melt idlule kwi-mold. Inkqubo yokugalela ingena kwindawo evaliweyo yokungunda kwaye yenza ukuzaliswa kokuhamba. Xa inyibilika igcwalisa umgodi wokungunda, kwaye emva kokubamba uxinzelelo olufanelekileyo kunye nokuqina, ukubumba kunokuvulwa ukususa imveliso. Okwangoku, isitofu sokubumba sisetyenziswa ikakhulu kwiimveliso zeplastiki ze-thermoset.
Xa kuthelekiswa nokubumba ukunyanzeliswa, ukubunjwa kwenaliti ye-carbide eyenziwe ngesamente kuneplastiki yeplastiki ngaphambi kokuba ingene emngxunyeni, ngoko ke umjikelo wokubumba umfutshane, ukusebenza kakuhle kwemveliso kuphezulu, iinxalenye zeplastiki zinokuchaneka okuphezulu, umgangatho olungileyo, kwaye akukho flash. Ibhityile kakhulu; inokubumba iinxalenye zeplastiki ezinokufakwa ezincinci, imingxuma esemacaleni enzulu kunye neenxalenye zeplastiki ezintsonkothileyo; sebenzisa izixhobo ezingaphezulu; izinga le-shrinkage lokubunjwa kwe-injection likhulu kunomlinganiselo we-shrinkage wokubumba ukunyanzeliswa, okuya kuchaphazela ukuchaneka kweengxenye zeplastiki, kodwa kwi-powder Izingxenye zePlastiki ezizaliswe ngeefayili zemilo zinempembelelo encinci; isakhiwo se-cemented carbide injection mold sinzima ngakumbi kunobumba bokunyanzeliswa, uxinzelelo lokubumba luphezulu, kwaye umsebenzi wokubumba unzima kakhulu. Isitofu sokubumba sisetyenziswa kuphela xa ukubunjwa koxinzelelo akukwazi ukuhlangabezana neemfuno zemveliso. Ukubunjwa kwe-injection kukulungele ukubunjwa kweengxenye zeplastiki ze-thermosetting ezinemilo enzima kunye nokufakwa okuninzi.
Iiparameters eziphambili zenkqubo ye-cemented carbide mold injection molding ibandakanya uxinzelelo lokubumba, ubushushu bokubumba kunye nomjikelo wokubumba, njl. Zonke zihambelana nezinto ezifana nohlobo lweplastiki, isakhiwo sokubumba, kunye neemeko zemveliso.
(1) Uxinzelelo lokubumba lubhekisa kuxinzelelo olwenziwa ngumshicileli kwinyibilika kwigumbi lokutyisa ngekholamu yoxinzelelo okanye iplunger. Ekubeni kukho ilahleko yoxinzelelo xa inyibilika idlula kwinkqubo yokugaya, uxinzelelo lokubumba ngexesha lokutofa koxinzelelo ngokuqhelekileyo ngamaxesha angama-2 ukuya kwe-3 ngexesha lokubumba. Uxinzelelo lokubumba lwe-phenolic yeplastiki ye-powder kunye ne-amino ye-amino powder ngokuqhelekileyo yi-50 ~ 80MPa, kwaye uxinzelelo oluphezulu lunokufikelela kwi-100 ~ 200MPa; iiplastiki ezinefiber filler yi80~160MPa; iiplastiki zokupakisha ezinoxinzelelo oluphantsi ezifana ne-epoxy resin kunye ne-silicone yi-2 ~ 10MPa.
(2) Ukushisa okwenza i-cemented mold ye-carbide iquka ubushushu bezinto eziphathekayo kwigumbi lokutyisa kunye nobushushu besikhunta ngokwayo. Ukuze kuqinisekiswe ukuba izinto eziphathekayo zine-fluidity efanelekileyo, ubushushu bezinto eziphathekayo kufuneka bube ngaphantsi ngokufanelekileyo kune-cross-linking lokushisa nge-10 ~ 20 ° C. Ekubeni iplastiki inokufumana inxalenye yokushisa kwe-friction xa idlula kwisistim sokuthulula, ukushisa kwegumbi lokutya kunye nokubunjwa kunokuba ngaphantsi. Ubushushu bomngundo wokubumba inaliti buqhele ukuba yi-15 ~ 30℃ ngaphantsi kunaleyo yokubumba ngoxinzelelo, ngokubanzi yi-130 ~ 190℃.
(3) Umjikelezo we-injection ye-injection ye-cemented molds ye-carbide iquka ixesha lokutya, ixesha lokuzalisa i-mold, i-cross-link kunye nexesha lokunyanga, ixesha lokudiliza ukukhupha iiplastiki kunye nexesha lokucoca i-mold. Ixesha lokuzaliswa kwe-injection yokubunjwa ngokuqhelekileyo i-5 ukuya kwimizuzwana ye-50, ngelixa ixesha lokunyanga lixhomekeke kuhlobo lweplastiki, ubungakanani, imilo, ubukhulu bodonga, iimeko zokufudumala kunye nesakhiwo se-mold inxalenye yeplastiki, kwaye ngokuqhelekileyo i-30 ukuya kwi-180 imizuzwana. Ukubumba isitofu kufuna ukuba iplastiki ibe ne-fluidity enkulu ngaphambi kokufikelela kwiqondo lokushisa elinzima, kwaye emva kokufikelela kwiqondo lokushisa elinzima, kufuneka libe nesantya esikhawulezayo sokuqina. Izinto ezisetyenziswa ngokuqhelekileyo zokubumba inaliti ziquka: iiplastiki zephenolic, i-melamine, i-epoxy resin kunye nezinye iiplastiki.
Ixesha lokuposa: Sep-18-2024
