Amasu Okulingisa Ekwenziweni Kwepulasitiki Nezinhlobo Zepulasitiki Ezifanele
Ukukhipha ipulasitiki kuyindlela yokukhiqiza esetshenziswa kabanzi ukudala imikhiqizo yepulasitiki, ikakhulukazi lapho kudingeka izindawo ezibushelelezi, izimo ezinemininingwane, noma ukukhiqizwa okuncane kuya kokuphakathi. Ngokungafani nokubumba ngomjovo, okudinga umfutho ophezulu kanye nemishini ekhethekile, ukukhipha ipulasitiki kulula kakhulu ngoba izinto zepulasitiki, ezisesimweni soketshezi noma sesisombululo, zithelwa esikhumbeni bese zivunyelwa ukuba ziqine ngokupholisa, ukusabela kwamakhemikhali, noma ukuhwamuka kwe-solvent. Lesi sihloko sixoxa ngezimiso eziyisisekelo zamasu okukhipha ipulasitiki, izinyathelo zenqubo, izinzuzo kanye nokungalungi kwayo, kanye nezinhlobo zepulasitiki ezifanele kakhulu.
Iyini Indlela Yokwenza Ipulasitiki?
Ngokuvamile, ukubumba kuyinqubo yokwakha into ngokuthulula into ewuketshezi esikhumbeni, esibe sesiqina futhi sivumelane nesimo somgodi wesikhumbeni. Uma kukhulunywa ngepulasitiki, igama elithi "uketshezi" lingasho izinto eziningana: i-resin enezingxenye ezimbili esabela ekwakheni i-polymer eqinile, ipulasitiki encibilikisiwe, noma ipulasitiki encibilikisiwe ku-solvent (ukubumba okuncibilikisiwe). Ngemva kokuqina, umkhiqizo ususwa esikhumbeni futhi ngokuvamile uqedwa njengokusikwa, ukusandwa, noma ukumbozwa.
Amasu okubumba avame ukusetshenziswa ukudala ama-prototypes, izingxenye zokuhlobisa, amalensi noma izembozo ezibonakalayo, izembozo, ngisho nezingxenye zezimboni ezine-geometries ethile okunzima ukuyifeza ngezinye izinqubo. Ngenxa yokuthi incike kakhulu ezicini zokugeleza kwezinto kanye nomklamo wesikhunta, ukukhethwa kwepulasitiki kuyisihluthulelo sokufeza imiphumela eqinile, ezinzile, nengenamaphutha.
Izinhlobo Zezindlela Zokuphonsa Ngepulasitiki
1. Ukuphonswa kwe-Resin (Ukuphonswa Okusekelwe Ekusabeleni Kwamakhemikhali)
Lena yindlela ethandwa kakhulu yokwenziwa kwepulasitiki yesimanje. I-resin (ngokuvamile izingxenye ezimbili: i-resin ne-hardener) iyaxutshwa bese ithululelwa esikhumbeni. Kube sekwenzeka ukusabela kwe-polymerization, okubangela ukuthi iqine.
Izibonelo zezinto zokwakha: i-polyurethane (PU) resin, i-epoxy resin, i-polyester resin.
Ifanele: izingxenye ezinemininingwane, imikhiqizo yokuzilibazisa/yezandla, ama-prototypes ezimboni, izingxenye zikagesi (ukubhaka amabhodwe).
2. Ukuphonswa Kwe-solvent (Ukuphonswa Kusuka Kusisombululo)
I-polymer incibilikiswa ku-solvent efanele kuze kube yilapho yakha isixazululo esijiyile, bese ithululelwa endaweni eyisicaba noma isikhunta. I-solvent iyahwamuka kancane, ishiye ifilimu yepulasitiki.
Izibonelo zezinto zokwakha: I-PVC, i-cellulose acetate, i-PVA, ezinye izinhlobo ze-acrylic ezinhlelweni ezithile.
Ifanele: amafilimu amancane, amashidi aguquguqukayo, izembozo, ulwelwesi.
3. Ukuncibilikisa (Ukuncibilikisa Okuvela Ekuncibilikiseni)
Ipulasitiki iyashiswa ize incibilike futhi ikwazi ukugeleza, bese ithululelwa esikhumbeni ngaphambi kokuba iqine futhi njengoba iphola. Le ndlela iyinselele kakhulu ngoba ama-thermoplastic amaningi anokuthamba okuphezulu lapho encibilika, okudinga izinga lokushisa futhi ngezinye izikhathi ukulawula ingcindezi.
Izibonelo zezinto zokwakha: ezinye izinhlobo ze-nylon kanye ne-thermoplastics ekhethekile (kuye ngokuthi isetshenziswa kanjani kanye nemishini).
Ifanele: izinhlelo zokusebenza ezithile ezivumela ukushisa okuzinzile kanye nezikhunta ezingamelani nokushisa.
Izigaba Ezijwayelekile Zenqubo Yokuphonsa
Nakuba izinhlobo zihlukile, inqubo yokubumba ngokuvamile ilandela lezi zinyathelo:
1. Umklamo kanye nokulungiswa kwesikhunta
Izikhunta zingenziwa nge-silicone (ukuze kube nemininingwane eminingi futhi kube lula ukuyisusa), insimbi, ingilazi, noma ipulasitiki eqinile. I-silicone ivame ukukhethwa ukuze isetshenziswe ekubunjweni kwe-resin ngoba iyaguquguquka, imelana nama-resin amaningi, futhi kulula ukuyisusa.
2. Ukuphathwa kwe-ejenti yokukhulula
Izinto zokukhulula zivimbela umkhiqizo ukuthi unamathele ku-mold. Lokhu kubaluleke kakhulu ezikhumbeni eziqinile noma ezintweni ze-resin ezivame "ukuluma" ubuso be-mold.
3. Ukukala nokuxuba izinto
Ngama-resin anezingxenye ezimbili, isilinganiso sokuxuba kumele sibe sinembile. Amaphutha amancane angabangela imiphumela ebuthakathaka, enamathelayo, noma engakapheki kahle.
4. Ukususa igesi (ukunciphisa amabhamuza)
Amabhamuza omoya angenye yeziphambeko ezivame kakhulu. Ukususa igesi kungenziwa kusetshenziswa igumbi lokuhlanza, ukuthulula kancane, noma ukusebenzisa ibhodwe lokucindezela ngemva kokuthulula ukuze "ucindezele" amabhamuza abe yizicucu ezincane kakhulu.
5. Ukulawula ukuthulula nokugeleza
Indlela yokuthela ithinta ikhwalithi: ukuthela kusuka endaweni eyodwa, ukugcina umfudlana omncane, nokugwema ukuxokozela kusiza ekunciphiseni amabhamuza.
6. Ukupholisa/ukulungisa/ukulungisa
Ukuhlanza i-resin kungathatha imizuzu kuya emahoreni. Ukuhlanza i-solvent kudinga ukuhwamuka okulawulwayo ukuze kuvinjelwe ukuqhekeka. Ukuhlanza i-melting kuncike ekupholiseni ukuze kuqiniswe.
7. Ukususa nokuqeda
Umkhiqizo ususwa esikhumbeni, bese unqunywa, ubushelelezi, upholishwe (ukuze kubonakale), noma upendwe/umbozwe nge-UV.
Izinzuzo kanye nokungalungi kwezindlela zokukhipha
Izinzuzo:
– Kufanelekela ukukhiqizwa okuncane kanye nama-prototype ngoba izindleko zamathuluzi ziphansi kakhulu.
– Iyakwazi ukukhiqiza imininingwane emincane, okuhlanganisa nokuthungwa kwendawo.
– Ingenza izingxenye ezijiyile noma izimo eziyinkimbinkimbi ngaphandle kwemishini ebizayo (ikakhulukazi i-resin casting).
– Izinketho eziningi zezakhiwo zezinto ezibonakalayo: ezicacile, eziguquguqukayo, eziqinile, ezimelana nokushayisana, ezimelana nokushisa (kuye ngokuthi i-resin).
Ukushoda:
– Isikhathi senqubo side kune-injection molding (ikakhulukazi ukuphola).
– Ingozi yama-bubbles, ukushwabana, noma ukukhubazeka kobuso uma inqubo ingalawulwa.
– Amanye ama-resin akhipha ukushisa ngesikhathi sokuqina (exothermic) ngakho-ke kukhona ingozi yokuqhekeka ezingxenyeni ezijiyile.
– Ukuhambisana phakathi kweqembu kungaba nzima kakhulu ukukugcina kunasezinqubweni zezimboni ezicindezela kakhulu.
Izinhlobo Zepulasitiki Ezifanele Ukuphonswa
Okulandelayo yizinhlobo ezivame kakhulu zepulasitiki/i-resin ezifanelekela amasu okuthunga, kanye nezici zazo.
1. I-Polyurethane (PU) Casting Resin
I-PU ithandwa kakhulu ekubunjweni ngoba kulula ukuyicubungula futhi itholakala ngezakhiwo eziningi ezahlukene: kusukela kuma-elastomer aguquguqukayo kuya kuma-elastomer aqinile njenge-ABS.
Izinzuzo:
– Ukwelapha kushesha kakhulu.
– Izakhiwo zemishini zingalungiswa (ziguquguquka kalula).
– Kufanelekela izingxenye ezikopishiwe kanye ne-prototyping.
Izicelo: amasondo amancane, amabhampa okuvikela, izindlu, izingxenye zezimboni ezilula.
2. I-Epoxy Resin
I-Epoxy yaziwa ngokunamathela kwayo okuhle, amandla okusebenza kanye nokuqina kwayo okulinganayo.
Izinzuzo:
– Iqinile futhi imelana namakhemikhali.
– Ukuncipha okuphansi.
– Kufanelekela ama-laminate ahlanganisiwe (i-glass/carbon fiber).
Ukushoda:
– Kungabiza kakhulu futhi kuthathe isikhathi eside ukwelapha.
– Ezinye izinhlobo zivame ukuba phuzi uma zichayeke ku-UV (ngaphandle kwama-epoxies akhethekile azinzile ku-UV).
Izicelo: ukubumba nge-elekthronikhi, izingxenye ezincane zesakhiwo, amatafula e-epoxy, izembozo.
3. I-Polyester Resin
I-resin ye-polyester ivame ukusetshenziswa embonini ye-fiberglass ngoba iyonga kakhulu futhi inqubo ilula.
Izinzuzo:
– Izindleko eziphansi.
– Kufanelekela izinhlanganisela ze-fiberglass.
Ukushoda:
– Iphunga elibukhali (i-styrene) futhi idinga umoya omuhle.
– Ukuncishiswa kungaba phezulu kune-epoxy.
Izicelo: amaphaneli e-fiberglass, amakhithi omzimba, imikhiqizo ye-GRP (ipulasitiki eqiniswe ngengilazi).
4. Ukuphotha kwe-Acrylic (PMMA) (Ukuphotha kwe-Acrylic)
I-PMMA yaziwa ngokuthi "i-acrylic," ecacile njengengilazi. Uma isesimweni se-acrylic ehlanganisiwe, izinto zingakhiqizwa ngenqubo yokubumba, okuholela ekukhanyeni okuhle kakhulu.
Izinzuzo:
– Ukukhanya okuphezulu kanye nobuso obuhle.
– Ukuzinza kwesimo sezulu kungcono kunezinye izinto eziningi ezicacile zepulasitiki.
Izicelo: amalensi, izibonisi, amaphaneli asobala, izimpawu zekhwalithi ephezulu.
5. I-PVC (Ukwenziwa Kwe-solvent Yefilimu/Ukumboza)
I-PVC ingacutshungulwa ngokuphonswa kwe-solvent ukuze kukhiqizwe amashidi noma izendlalelo ezithile.
Izinzuzo:
– Iguquguqukayo (kuye ngokuthi ipulasitiki isetshenziswa kanjani).
– Kufanelekela amafilimu kanye nezingubo zokumboza.
Qaphela: ukukhethwa kwesinyibilikisi kanye nokulawulwa kokuhwamuka kubalulekile ukuze kube nekhwalithi.
6. I-Silicone (Akuyona ipulasitiki yakudala, kodwa ivame ukuthungwa)
Nakuba i-silicone ihlukaniswa njenge-elastomer, ivame ukubunjwa kusetshenziswa indlela yokubumba (izingxenye ezimbili). I-Silicone ivame ukusetshenziswa njengento yokubumba kwamanye ama-resin.
Izicelo: ama-gasket, isikhunta esiguquguqukayo, izingxenye ezithile zezokwelapha, izivalo.
Amathiphu Okukhetha Ipulasitiki Yokubumba
1. Nquma izidingo zesakhiwo semishini: ukuthi kufanele siqine, siguquguquke, noma singamelani nokushayisana.
2. Naka ubukhulu bomkhiqizo: izingxenye ezijiyile zisengozini enkulu yokushisa okungaphandle (ama-resin athile), ukuqhekeka, noma ukushwabana.
3. Cabanga ngokubukeka: ngemikhiqizo ecacile, khetha i-resin ecacile kakhulu kanye nekhono elihle lokupholisha (isb. ama-epoxies athile noma i-acrylic eqoshiwe).
4. Hlola ukumelana nemvelo: I-UV, ukushisa, noma amakhemikhali kungadinga ama-resin akhethekile.
5. Zivumelanise nendlela yokubumba: i-silicone ifanelekela ama-resin amaningi, kuyilapho isikhunta esiqinile singadinga i-ejenti yokukhulula efanele.
Isiphetho
Ukukhipha ipulasitiki kuyindlela ephumelelayo yokukhiqiza ipulasitiki lapho kudingeka ukuguquguquka komklamo, imininingwane emincane, kanye nezindleko zokuqala eziphansi uma kuqhathaniswa nezinqubo ezifana nokubumba nge-injection. Ngokuqonda izinhlobo ezahlukene zokukhipha ipulasitiki—ukukhipha i-resin, ukukhipha i-solvent, kanye nokukhipha i-melt—nokukhetha izinto ezifanele, njenge-PU, i-epoxy, i-polyester, i-acrylic, noma i-PVC, umkhiqizo ophumayo ungahlangabezana nezidingo ezisebenzayo nezobuhle. Isihluthulelo sokukhipha ngempumelelo sisekulawuleni ukuxuba, ukuthulula, ukunciphisa amabhamuza, kanye nokulungisa kahle.
Uma ungathanda, ngingaguqula lesi sihloko sibe sezobuchwepheshe kakhulu (isib., engeza amapharamitha enqubo, izibonelo zesilinganiso sokuxuba i-resin, noma izifundo zamacala zemikhiqizo ethile), noma ngenze inguqulo elula yemisebenzi yesikole.
