Inqubo yokubumba ye-SMC/BMC

Isikhunta se-SMC

I-SMC iyinhlanganisela yokubumba amashidi.

Izinto zokusetshenziswa eziyinhloko ze-SMC zakhiwe nge-GF (intambo ekhethekile), i-UP (i-resin engafakwanga), izithasiselo ezinciphayo eziphansi, i-MD (isigcwalisi) kanye nama-axiliary ahlukahlukene.

I-SMC inezinzuzo zokumelana nokugqwala okuphakeme, ukuthambile, ukwakheka okulula kobunjiniyela, nokuguquguquka. Izakhiwo zayo zemishini ziqhathaniswa nezinye izinto zensimbi. Imikhiqizo eyikhiqizayo inezinzuzo zokuqina okuhle, ukumelana nokuguquguquka, kanye nebanga lokushisa elibanzi lokusebenza.

Ngesikhathi esifanayo, ubukhulu bemikhiqizo ye-SMC abukhubazeki kalula futhi bunokumelana nokushisa okuhle kakhulu; ingagcina ukusebenza kwayo kahle ezindaweni ezibandayo nezishisayo, futhi ifanelekela ukumelana ne-UV yangaphandle nemisebenzi engangeni manzi.

Isetshenziswa kakhulu, njengamabhampa emoto angaphambili nangemuva, izihlalo, amaphaneli eminyango, izinto zikagesi, obhavu, njll.

Isikhunta se-BMC

I-BMC isifinyezo se-(Bulk Molding Compounds), okuyinhlanganisela yokubumba ngobuningi.

I-BMC iyipulasitiki yokushisa exubene nezihlungi ezihlukahlukene ze-inert, iziqinisekiso ze-fiber, ama-catalysts, iziqinisi kanye nemibala ukuze kwakhiwe into ehlanganisiwe enamathelayo "enjenge-putty-like" yokubumba ukucindezelwa noma ukubumba umjovo. Ngokuvamile kwenziwa nge-extrusion. Yenza ama-granules, amalogi noma ama-strips ukusiza ukucubungula nokubunjwa okulandelayo.

I-BMC inezinto eziningi ezihlukile, njengokuqina okuphezulu, isisindo esincane, ukumelana nokugqwala, ukumelana ne-UV, ukwahlukanisa okuhle, kanye nezakhiwo ezinhle kakhulu zokushisa, okwenza i-BMC ifiseleke kakhulu kune-thermoplastics. Ngesikhathi esifanayo, njengoba izingxenye eziningi zingabunjwa ngesikhathi esifanayo nalezi zingxenye, asikho isidingo sokucubungula emva kokucubungula, okunomnotho kakhulu ngombono wokukhiqiza.

Njengamanje, isikhunta se-BMC sisetshenziswe ezimotweni, amandla, izinto zikagesi, izinsiza zokudla, izinto zasendlini, izinto zensimbi yokubona, izimboni nezakhayo kanye nezinye izindawo. Okufana namakhava okukhanya komsila wemoto, amabhokisi kagesi, amabhokisi amamitha, njll.

1. Ukulungiselela ngaphambi kokucindezelwa

(1) Ukuhlolwa kwekhwalithi ye-SMC/BMC: Ikhwalithi yamashidi e-SMC inomthelela omkhulu kunqubo yokubumba kanye nekhwalithi yomkhiqizo. Ngakho-ke, kuyadingeka ukuqonda ikhwalithi yezinto ngaphambi kokucindezela, njengefomula yokunamathisela i-resin, ijika elijiyayo le-resin paste, okuqukethwe kwe-fiber yengilazi, kanye nohlobo lwe-ejenti yokulinganisa i-fiber yengilazi. Isisindo seyunithi, ukuxebuka kwefilimu, ubulukhuni nokufana kwekhwalithi, njll.

(2) Ukusika: Nquma ukuma nobukhulu beshidi ngokuya ngokuma kwesakhiwo somkhiqizo, indawo yokudla, kanye nenqubo, yenza isampula, bese usika impahla ngokuvumelana nesampula. Umumo wokusika uvame ukuba yisikwele noma uyindilinga, futhi ubukhulu buvamise ukuba ngu-40% -80% wendawo engaphezulu ehlongozwayo yomkhiqizo. Ukuze uvimbele ukungcola okuvela ekungcoleni kwangaphandle, amafilimu aphezulu naphansi ayasuswa ngaphambi kokulayisha.

Ishadi lokugeleza kwenqubo yokubumba

2. Ukulungiswa kwemishini

(1) Yazi imingcele ehlukahlukene yokusebenza komshini wokunyathelisa, ikakhulukazi lungisa ingcindezi yokusebenza, isivinini sokusebenza sokucindezela nokuhambisana kwetafula.

(2) Isikhunta kufanele sifakwe ngokuvundlile futhi siqinisekise ukuthi indawo yokufaka iphakathi nendawo yetafula lokucindezela. Ngaphambi kokucindezela, isikhunta kufanele sihlanzwe kahle futhi sisetshenziswe i-ejenti yokukhulula. Ngaphambi kokwengeza izinto, sula i-ejenti yokukhululwa ngokulinganayo nge-gauze ehlanzekile ukuze ugweme ukuthinta ukubukeka komkhiqizo. Ukuze uthole isikhunta esisha, uwoyela kufanele ususwe ngaphambi kokusetshenziswa.

3. Ukwengeza izithako

(1) Ukunqunywa kwenani lokuphakelwa: Inani lokuphakelwa lomkhiqizo ngamunye lingabalwa ngokuya ngefomula elandelayo ngesikhathi sokucindezela kokuqala:

Inani elingeziwe = umthamo womkhiqizo × 1.8g/cm³

(2) Ukunqunywa kwendawo yokudla: Ubukhulu bendawo yokudla buthinta ngokuqondile ukuminyana komkhiqizo, ibanga lokugeleza lempahla kanye nekhwalithi yangaphezulu yomkhiqizo. Ihlobene nokugeleza nezici zokuqinisa ze-SMC, izidingo zokusebenza komkhiqizo, isakhiwo sesikhunta, njll. Ngokuvamile, indawo yokudla ingama-40% kuya ku-80%. Uma incane kakhulu, inqubo izoba yinde kakhulu, okuzoholela ekuqondisweni kwe-fiber yengilazi, ukunciphisa amandla, ukwandisa ama-waviness, ngisho nokuhluleka ukugcwalisa isikhunta sesikhunta. Uma inkulu kakhulu, ayihambisani nokukhipha umoya futhi ingase ibangele kalula imifantu emkhiqizweni.

(3) Indawo yokudla kanye nendlela: Indawo yokudla kanye nendlela kuthinta ngokuqondile ukubukeka, amandla kanye nendlela yomkhiqizo. Ngokujwayelekile, indawo yokondla impahla kufanele ibe phakathi nendawo yesikhunta. Ngemikhiqizo ye-asymmetrical neyinkimbinkimbi, indawo yokondla kufanele iqinisekise ukuthi ukugeleza kwezinto ezibonakalayo kufinyelela kuzo zonke iziphetho ze-mold forming cavity ngesikhathi esifanayo ngesikhathi sokubumba. Indlela yokudla kufanele ivumelane nokuqeda amandla. Lapho unqwabelanisa izingqimba eziningi zamashidi, kungcono ukunqwabelanisa izingcezu zezinto ngendlela ye-pagoda enengaphezulu elincane kanye nephansi elikhulu. Ngaphezu kwalokho, zama ukuthi ungangezi amabhulokhi wezinto ngokwehlukana, ngaphandle kwalokho ukufakwa komoya kanye nezindawo zokushisela kuzokwenzeka, okuholela ekunciphiseni kwamandla omkhiqizo.

(4) Abanye: Ngaphambi kokwengeza izinto, ukuze kwandiswe uketshezi lweshidi, ukushisa kuqala ku-100 ° C noma ku-120 ° C kungasetshenziswa. Lokhu kunenzuzo ikakhulukazi ekwenzeni imikhiqizo edwetshiwe ejulile.

4. Ukwakha

Lapho i-block material ingena emgodini wesikhunta, umshini wokunyathelisa wehla ngokushesha. Lapho isikhunta esiphezulu nesiphansi sifaniswa, ingcindezi yokubumba edingekayo isetshenziswa kancane kancane. Ngemva kwesistimu ethile yokwelapha, ukubunjwa komkhiqizo kuqediwe. Phakathi nenqubo yokubumba, imingcele yenqubo yokubumba ehlukahlukene kanye nezimo zokusebenza zokucindezela kufanele kukhethwe ngokunengqondo.

(1) Izinga lokushisa lokubumba: Izinga lokushisa lokubumba lincike ohlelweni lokuphulukisa lokunamathisela kwe-resin, ubukhulu bomkhiqizo, ukusebenza kahle kokukhiqiza kanye nobunkimbinkimbi besakhiwo somkhiqizo. Izinga lokushisa lokubumba kufanele liqinisekise ukuthi uhlelo lokwelapha luqalisiwe, ukusabela kokuxhumanisa kuqhubeke kahle, futhi ukuphulukiswa okuphelele kufinyelelwa. Ngokuvamile, izinga lokushisa lokubumba elikhethelwe imikhiqizo ewugqinsi kufanele libe phansi kunalelo lemikhiqizo enezindonga ezincane. Lokhu kungavimbela ukunqwabelana kokushisa okudlulele ngaphakathi kwemikhiqizo ewugqinsi ngenxa yezinga lokushisa elidlulele. Uma ubukhulu bomkhiqizo buyi-25 ~ 32mm, izinga lokushisa lokubumba liyi-135 ~ 145 ℃; kuyilapho imikhiqizo emincane ingabunjwa ku-171 ℃. Njengoba izinga lokushisa lokubumba likhuphuka, isikhathi sokuphulukisa esihambisanayo singafinyezwa; ngokuphambene, lapho izinga lokushisa lokubumba lincipha, isikhathi sokuphulukisa esihambisanayo sidinga ukunwetshwa. Izinga lokushisa lokubumba kufanele likhethwe njengendlela yokuhweba phakathi kwesivinini esiphezulu sokuphulukisa kanye nezimo ezifanele zokubumba. Ngokuvamile kukholakala ukuthi izinga lokushisa lokubumba i-SMC liphakathi kuka-120 no-155°C.

(2) Ingcindezi yokubumba: Ingcindezi yokubumba ye-SMC/BMC iyahlukahluka ngesakhiwo somkhiqizo, umumo, usayizi kanye neziqu zokujiya ze-SMC. Imikhiqizo enobumo obulula idinga kuphela ingcindezi yokubumba engu-5-7MPa; imikhiqizo enobumo obuyinkimbinkimbi idinga ingcindezi yokubumba efika ku-7-15MPa. Ukuphakama kwedigri yokujiya ye-SMC, iba nkulu ingcindezi yokubumba edingekayo. Ubukhulu bengcindezi yokubumba bubuye buhlotshaniswe nesakhiwo sesikhunta. Ingcindezi yokubumba edingekayo ekukhunjweni kwesakhiwo esihlukanisayo esiqondile iphansi kunaleyo yesikhunta sesakhiwo sokuhlukanisa esivundlile. Isikhunta esinezimvume ezincane sidinga ingcindezi ephakeme kunesikhunta esinezimvume ezinkulu. Imikhiqizo enezidingo eziphezulu ekusebenzeni kokubukeka nokushelela idinga ingcindezi ephezulu yokubumba ngesikhathi sokubumba. Ngamafuphi, izici eziningi kufanele zicatshangelwe lapho kunqunywa ingcindezi yokubumba. Ngokuvamile, ingcindezi yokubumba ye-SMC iphakathi kuka-3-7MPa.

(3) Isikhathi sokuphulukisa: Isikhathi sokuphulukisa se-SMC/BMC ekushiseni kokubumba (okubizwa nangokuthi isikhathi sokubamba) sihlobene nezakhiwo zayo, uhlelo lokuphulukisa, izinga lokushisa lokubumba, ukushuba komkhiqizo kanye nombala nezinye izici. Isikhathi sokwelashwa ngokuvamile sibalwa njengama-40s/mm. Emikhiqizweni emikhulu kuno-3mm, abanye abantu bacabanga ukuthi njalo ngo-4mm ukwanda, isikhathi sokuphulukisa sizokhula ngomzuzu ongu-1.

5. Ukulawulwa kwenqubo yokukhiqiza yokubumba

(1) Ukulawula inqubo

I-viscosity (ukungaguquguquki) kwe-SMC kufanele ihlale ingashintshi ngesikhathi sokucindezela; ngemuva kokukhipha ifilimu yenkampani ye-SMC, ayikwazi ukushiywa isikhathi eside. Kufanele icindezelwe ngokushesha ngemva kokukhipha ifilimu futhi akufanele ivezwe emoyeni ukuvimbela ukuvuthwa ngokweqile kwe-styrene; gcina i-SMC Isimo sokudla kanye nesimo sokudla kweshidi esikhunjeni kufanele sihambisane; gcina izinga lokushisa lesikhunta ezindaweni ezihlukene ezifanayo futhi njalo, futhi kufanele ihlolwe njalo. Gcina izinga lokushisa lokubumba nokucindezela kokubumba kungashintshi phakathi nenqubo yokubumba futhi uzihlole njalo.

(2) Ukuhlolwa komkhiqizo

Imikhiqizo kufanele ihlolelwe lezi zici ezilandelayo:

Ukuhlolwa kokubukeka: njengokucwebezela, ukucaba, amabala, umbala, imigqa yokugeleza, imifantu, njll.;

Ukuhlolwa kwempahla yemishini: amandla okugoba, amandla aqinile, i-elastic modulus, njll., ukuhlolwa kokusebenza komkhiqizo wonke; ezinye izakhiwo: ukumelana nogesi, ukumelana nokugqwala kwemidiya.