Inkqubo yokubumba i-SMC/BMC

SMC ngundo

I-SMC yikhompawundi yokubumba amaphepha.

Izixhobo eziphambili ze-SMC zenziwe nge-GF (umsonto okhethekileyo), i-UP (i-resin unsaturated), izongezo ezincitshisiweyo eziphantsi, i-MD (i-filler) kunye nezincedisi ezahlukeneyo.

I-SMC ineengenelo zokumelana nomhlwa okuphezulu, ukuthamba, uyilo lobunjineli olulula, kunye nokuguquguquka. Iimpawu zayo zemishini zifaniswa nezinye izinto zetsimbi. Iimveliso ezizenzayo zineenzuzo zokungaguquguquki okulungileyo, ukuxhathisa ukuguquka, kunye noluhlu olubanzi lobushushu bokusebenza.

Kwangaxeshanye, ubungakanani beemveliso ze-SMC abukho lula kwaye bunokumelana nobushushu obugqwesileyo; inokugcina ukusebenza kwayo kakuhle kwindawo ebandayo kunye neshushu, kwaye ifanelekile ukuchasana kwe-UV yangaphandle kunye nemisebenzi engenamanzi.

Isetyenziswa kakhulu, njengemoto yangaphambili kunye neebhampa zangasemva, izihlalo, iipaneli zocango, izixhobo zombane, iibhafu, njl.

Ukubumba kwe-BMC

I-BMC sisishunqulelo se (I-Bulk Molding Compounds), eyikhompawundi yokubumba isambuku.

I-BMC yiplastiki ye-thermosetting exutywe kunye neentlobo ezahlukeneyo zokugcwalisa i-inert, i-fiber reinforcement, i-catalysts, izinzile kunye ne-pigments ukwenza into encamathelayo "efana ne-putty-like" edibeneyo yokubumba ukunyanzeliswa okanye ukubumba inaliti. Ngokuqhelekileyo yenziwa nge-extrusion. Imilo kwiigranules, iilog okanye imicu ukuququzelela ukusetyenzwa nokubunjwa okulandelayo.

I-BMC ineepropathi ezininzi ezizodwa, ezinjengokuqina okuphezulu, ubunzima obukhanyayo, ukuxhathisa ukubola, ukumelana ne-UV, ukugquma okulungileyo, kunye neempawu ezibalaseleyo zobushushu, ezenza i-BMC inqweneleke ngakumbi kune-thermoplastics. Ngexesha elifanayo, ekubeni amaninzi amacandelo anokubunjwa ngexesha elifanayo njengala macandelo, akukho mfuneko yokulungiswa kwe-post-processing, eyona nto iqoqosho kakhulu kwimbono yemveliso.

Okwangoku, ukubumba kwe-BMC kusetyenziswe kwiimoto, amandla, izixhobo zombane, iinkonzo zokutya, izixhobo zasekhaya, izixhobo ze-optical instrument, i-industrial kunye nezixhobo zokwakha kunye nezinye iindawo. Okufana nekhava yokukhanya komsila wemoto, iibhokisi zombane, iibhokisi zeemitha, njl.

1. Ukulungiselela ngaphambi koxinzelelo

(1) Ukuhlolwa komgangatho we-SMC / BMC: Umgangatho wamaphepha e-SMC unempembelelo enkulu kwinkqubo yokubumba kunye nomgangatho wemveliso. Ke ngoko, kuyafuneka ukuba uqonde umgangatho wezixhobo ngaphambi kokucinezela, ezinje ngefomula yokuncamathelisa intlaka, ijiko elijiyileyo lentlama yentlama, umxholo wefayibha yeglasi, kunye nohlobo lwe-agent yeglasi yokulinganisa ifayibha. Ubunzima beyunithi, ukuxetshulwa kwefilimu, ukuqina kunye nomgangatho ofanayo, njl.

(2) Ukusika: Misela imilo kunye nobukhulu bephepha ngokwemilo yesakhiwo semveliso, indawo yokutya, kunye nenkqubo, yenza isampuli, kwaye emva koko usike izinto ngokuhambelana nesampuli. Ubume bokusika ubukhulu becala okanye isetyhula, kwaye ubukhulu budla ngokuba yi-40% -80% yendawo eqikelelweyo yemveliso. Ukuze kuthintelwe ukungcoliswa kokungcola kwangaphandle, iifilimu eziphezulu kunye nezantsi zisuswe ngaphambi kokulayisha.

Inkqubo yokubumba itshati yokuqukuqela

2. Ukulungiswa kwezixhobo

(1) Ziqhelanise neeparitha ezahlukeneyo zokusebenza koshicilelo, ngakumbi uhlengahlengiso loxinzelelo lokusebenza, isantya sokusebenza sokushicilela kunye nokuhambelana kwetafile.

(2) Isikhunta kufuneka sifakwe ngokuthe tye kwaye siqinisekise ukuba indawo yokufakela iphakathi kwetafile yokushicilela. Ngaphambi kokucinezela, isikhunta kufuneka sicocwe kakuhle kwaye i-ejenti yokukhulula isetyenziswe. Ngaphambi kokuba ungeze izinto eziphathekayo, sula i-arhente yokukhululwa ngokulinganayo nge-gauze ecocekileyo ukuze ugweme ukuchaphazela ukubonakala kwemveliso. Kwizinto ezintsha zokubumba, ioli kufuneka isuswe ngaphambi kokusetyenziswa.

3. Ukongeza izithako

(1) Ukumiselwa kwexabiso lokutyisa: Isixa sokutya kwimveliso nganye singabalwa ngokwe fomula ilandelayo ngexesha lokucofa kokuqala:

Isixa esongezelelweyo = umthamo wemveliso × 1.8g/cm³

(2) Ukumiselwa kwendawo yokutya: Ubungakanani bendawo yokutya buchaphazela ngokuthe ngqo ubuninzi bemveliso, umgama wokuhamba kwezinto kunye nomgangatho ophezulu wemveliso. Inxulumene nokuhamba kunye neempawu zokuqinisa i-SMC, iimfuno zokusebenza kwemveliso, isakhiwo sokubumba, njl. Ngokuqhelekileyo, indawo yokutya i-40% ukuya kwi-80%. Ukuba incinci kakhulu, inkqubo iya kuba yinde kakhulu, eya kukhokelela kwi-glass fiber orientation, ukunciphisa amandla, ukonyusa ukuqina, kunye nokungaphumeleli ukuzalisa umgodi wokungunda. Ukuba inkulu kakhulu, ayifuni ukukhupha kwaye inokubangela ukuba kube lula ukuqhekeka kwimveliso.

(3) Isikhundla sokutya kunye nendlela: Indawo yokutya kunye nendlela ichaphazela ngokuthe ngqo ukubonakala, amandla kunye nolwalathiso lwemveliso. Ngokuqhelekileyo, indawo yokutya yezinto eziphathekayo kufuneka ibe phakathi kwendawo yokubumba. Kwimveliso ye-asymmetrical kunye neyinkimbinkimbi, indawo yokutya kufuneka iqinisekise ukuba ukuhamba kwezinto kufikelele kuzo zonke iziphelo ze-mold forming cavity ngexesha elifanayo ngexesha lokubumba. Indlela yokutya kufuneka ilungele ukudinwa. Xa ubeka iileyile ezininzi zamaphepha, kungcono ukupakisha iziqwenga zezinto ezibonakalayo kwimilo ye-pagoda kunye nomphezulu omncinci kunye nomzantsi omkhulu. Ukongezelela, zama ukuba ungafaki iibhloko eziphathekayo ngokwahlukileyo, ngaphandle koko ukuvalelwa komoya kunye neendawo ze-welding ziya kwenzeka, okubangela ukuhla kwamandla emveliso.

(4) Abanye: Ngaphambi kokufaka izinto eziphathekayo, ukwenzela ukwandisa umbane wephepha, ukufudumala kwi-100 ° C okanye i-120 ° C kungasetyenziswa. Oku kuluncedo ngakumbi ekwenzeni iimveliso ezizotywe nzulu.

4. Ukubumba

Xa ibhloko yezinto ingena kwi-mold cavity, i-press yehla ngokukhawuleza. Xa i-molds ephezulu kunye nesezantsi ihambelana, uxinzelelo olufunekayo lokubumba lusetyenziswa kancinci. Emva kwenkqubo ethile yokunyanga, ukubunjwa kwemveliso kugqityiwe. Ngexesha lenkqubo yokubumba, iiparameters zenkqubo yokubumba kunye neemeko zokusebenza cinezela kufuneka zikhethwe ngokufanelekileyo.

(1) Iqondo lokushisa lokubumba: Ubushushu bokubumba buxhomekeke kwinkqubo yokunyanga ye-resin paste, ubukhulu bemveliso, ukusebenza kakuhle kwemveliso kunye nobunzima besakhiwo semveliso. Ubushushu bokubumba kufuneka buqinisekise ukuba inkqubo yokunyanga iqalisiwe, i-cross-linking reaction iqhubeka kakuhle, kwaye ukunyanga ngokupheleleyo kufezekiswa. Ngokuqhelekileyo, ubushushu bokubumba obukhethiweyo kwiimveliso ezityebileyo kufuneka bube sezantsi kuneemveliso ezinodonga olubhityileyo. Oku kunokuthintela ukufumba kobushushu obugqithisileyo ngaphakathi kweemveliso ezishinyeneyo ngenxa yobushushu obugqithisileyo. Ukuba ubukhulu bemveliso yi-25 ~ 32mm, ubushushu bokubumba yi-135 ~ 145 ℃; ngelixa iimveliso ezibhityileyo zinokubunjwa kwi-171℃. Njengoko ubushushu bokubumba bukhula, ixesha lokunyanga elihambelanayo linokufinyezwa; ngokuchaseneyo, xa ubushushu bokubumba buyancipha, ixesha lokunyanga elihambelanayo lifuna ukwandiswa. Ubushushu bokubumba kufuneka bukhethwe njengorhwebo phakathi kwesantya esiphezulu sokunyanga kunye neemeko ezifanelekileyo zokubumba. Kukholelwa ngokubanzi ukuba iqondo lobushushu lokubumba i-SMC liphakathi kwe-120 kunye ne-155°C.

(2) Uxinzelelo lokubumba: Uxinzelelo lokubumba lwe-SMC / BMC luyahluka kunye nesakhiwo semveliso, imilo, ubungakanani kunye ne-SMC yokuqina. Iimveliso ezinemilo elula zifuna kuphela uxinzelelo lokubumba lwe-5-7MPa; iimveliso ezinemilo entsonkothileyo zifuna uxinzelelo lokubumba ukuya kuthi ga kwi-7-15MPa. Okukhona liphezulu iqondo lokutyeba le-SMC, kokukhona likhulu uxinzelelo lokubumba olufunekayo. Ubungakanani boxinzelelo lokubumba bukwanxulumene nesakhiwo sokubumba. Uxinzelelo lokubumba olufunekayo kwimibumbo yesakhiwo sokwahlula ngokuthe nkqo ungaphantsi kunobume besakhiwo sokwahlula okuthe tye. Izibungu ezineemvume ezincinci zifuna uxinzelelo oluphezulu kunobumba olunokukhutshwa okukhulu. Iimveliso ezineemfuno eziphezulu ekusebenzeni kwembonakalo kunye nokugudiswa zifuna uxinzelelo oluphezulu lokubumba ngexesha lokubumba. Ngamafutshane, izinto ezininzi kufuneka ziqwalaselwe xa kumiselwa uxinzelelo lokubumba. Ngokubanzi, uxinzelelo lokubumba lwe-SMC luphakathi kwe-3-7MPa.

(3) Ixesha lokunyanga: Ixesha lokunyanga le-SMC / BMC kwiqondo lokushisa lokubumba (elikwabizwa ngokuba lixesha lokubamba) lihambelana neempawu zayo, inkqubo yokunyanga, ubushushu bokubumba, ubukhulu bemveliso kunye nombala kunye nezinye izinto. Ixesha lokunyanga libalwa ngokubanzi njenge-40s/mm. Kwiimveliso ezingaphezulu kwe-3mm, abanye abantu bacinga ukuba yonke i-4mm yokunyuka, ixesha lokunyanga liya kwanda ngomzuzu omnye.

5. Ulawulo lwenkqubo yemveliso yokubumba

(1) Ulawulo lwenkqubo

I-viscosity (ukuhambelana) kwe-SMC kufuneka ihlale ihleli ngexesha loxinzelelo; emva kokususa ifilimu ye-carrier ye-SMC, ayikwazi ukushiywa ixesha elide. Kufuneka icinezelwe ngokukhawuleza emva kokususa ifilimu kwaye akufanele ibonakaliswe emoyeni ukukhusela ukuguqulwa okukhulu kwe-styrene; gcina i-SMC Ubume bokutya kunye nesikhundla sokutya kweshiti kwi-mold kufuneka ihambelane; gcina ubushushu bomngundo kwiindawo ezahlukeneyo ezifanayo kwaye rhoqo, kwaye kufuneka zihlolwe rhoqo. Gcina ubushushu bokubumba kunye noxinzelelo lokubumba rhoqo ngexesha lokubumba kwaye uhlolisise rhoqo.

(2) Uvavanyo lwemveliso

Iimveliso kufuneka zivavanyelwe le miba ilandelayo:

Ukuhlolwa kwenkangeleko: njengokukhazimla, ukucaba, amabala, umbala, imigca yokuhamba, iintanda, njl.njl.;

Uvavanyo lwepropathi yomatshini: amandla okugoba, ukomelela, imodyuli elastiki, njl.njl., uvavanyo lokusebenza kwemveliso yonke; ezinye iipropathi: ukuxhathisa kombane, ukuxhathisa i-corrosion media.