Ho lahla hlobo ea khetlake ts'ebetso eo lehlabathe le kopantsoeng le resin ea thermosetting le lumelloang ho kopana le poleiti e futhumetseng ea tšepe ea tšepe, e le hore ho thehoe khetla e tšesaane le e matla ea hlobo ho potoloha pattem. Ebe khetla e tlosoa ho tloha pateroneng 'me cope le ho hula li tlosoa hammoho' me li bolokoe ka botlolong e nang le lisebelisoa tse hlokahalang tsa ho boloka 'me tšepe e qhibilihisitsoeng e tšeloa ka har'a hlobo.
Ka kakaretso, lehlabathe le omeletseng le le letle (90 ho 140 GFN) le se nang letsopa ka ho feletseng le sebelisetsoa ho lokisa lehlabathe la ho bopa khetla. Boholo ba lijo-thollo bo lokelang ho khethoa bo itšetlehile ka sephetho se ka holimo se lakatsehang ho lahla. Boholo ba lijo-thollo bo botle haholo bo hloka resin e ngata, e etsang hore hlobo e be theko e boima.
Li-resin tsa maiketsetso tse sebelisoang ha ho etsoa likhetla ha e le hantle ke li-resin tse thermosetting, tse thatafalloang ke mocheso o ke keng oa thijoa. Li-resin tse sebelisoang haholo ke li-resin tsa phenol formaldehyde. Li kopantsoe le lehlabathe, li na le matla a phahameng haholo le ho hanyetsa mocheso. Li-phenolic resin tse sebelisoang ho bopa likhetla hangata ke tsa mefuta e 'meli ea sethala, ke hore, resin e na le phenol e feteletseng mme e sebetsa joalo ka thepa ea thermoplastic. Nakong ea ho roala ka lehlabathe resin e kopanngoa le "catalyst" e kang hexa methylene tetramine (hexa) ka karolo e ka bang 14 ho isa ho 16% e le ho hlahisa litšobotsi tsa thermosetting. Thempereichara ea ho phekola tsena e ka ba 150 C mme nako e hlokahalang e ka ba metsotsoana e 50 ho isa ho e 60.
Melemo ea Shell Mold Casting Process
1.Li-castings tsa hlobo ea likhetlaka kakaretso li nepahetse ho feta tsa lehlabathe. Hoa khoneha ho fumana mamello ea + 0,25 mm bakeng sa li-castings tsa tšepe le +0. 35 mm bakeng sa li-castings tsa tšepe tse bohlooho leductile tšepe castingstlas'a maemo a tloaelehileng a ho sebetsa. Tabeng ea hlobo ea likhetla tse mamelloang haufi, motho a ka e fumana ho tloha ho +0.03 ho ea ho +0.13 mm bakeng sa lits'ebetso tse ikhethileng.
2. Sebaka se boreleli se ka fumanoa ka likhetla tsa likhetla. Sena se finyelloa haholo-holo ka lijo-thollo tsa boholo bo botle bo sebelisoang. Mofuta o tloaelehileng oa ho khopama ke oa tatellano ea li-microns tse 3 ho isa ho tse 6.
3. Li-angles tsa moralo, tse tlase ho feta lehlabathe, li hlokahala ka har'a hlobo ea likhetla. Phokotso ea li-angles tsa moralo e kanna ea ba ho tloha ho 50 ho isa ho 75%, e leng ho bolokang litšenyehelo tsa thepa le litšenyehelo tse latelang tsa mochini.
4. Ka linako tse ling, li-cores tse khethehileng li ka tlosoa ha ho etsoa likhetla. Kaha lehlabathe le na le matla a mangata hlobo e ka etsoa ka tsela eo likoti tse ka hare li ka etsoang ka ho toba ka tlhokahalo ea li-cores tsa khetla.
5. Hape, likarolo tse tšesaane haholo (ho fihlela ho 0.25 mm) tsa mofuta oa lihlooho tsa li-cylinder tse nang le moea o pholileng li ka etsoa habonolo ke ho bōptjoa ha khetla ka lebaka la matla a phahameng a lehlabathe le sebelisetsoang ho bōpa.
6. Permeability ea khetla e phahame 'me kahoo ha ho na khase e kenyelletsoeng.
7. Ho hlokahala hore ho sebelisoe lehlabathe le lenyenyane haholo.
8. Mechine e khoneha habonolo ka lebaka la ts'ebetso e bonolo e amehang ho bopeng likhetla.
Meeli ea Mokhoa oa ho Lahlela Mould Shell
1. Li-pattens li theko e boima haholo 'me ka hona li na le moruo feela ha li sebelisoa tlhahiso e kholo. Ts'ebetsong e tloaelehileng, ho bopa likhetla ho ba moruo holim'a ho bōptjoa ha lehlabathe haeba tlhahiso e hlokahalang e ka holimo ho likotoana tse 15000 ka lebaka la litšenyehelo tse phahameng tsa mohlala.
2. Boholo ba ho lahla bo fumanoang ka ho bopa likhetla bo lekanyelitsoe. Ka kakaretso, li-castings tse boima ba lik'hilograma tse 200 li ka etsoa, le hoja ka bongata bo fokolang, ho etsoa li-castings ho fihlela boima ba 450 kg.
3. Libopeho tse rarahaneng haholo li ke ke tsa fumanoa.
4. Ho hlokahala lisebelisoa tse rarahaneng haholoanyane bakeng sa ho tšoara likhetla tse kang tse hlokahalang bakeng sa mekhoa ea tšepe e futhumetseng.
Nako ea poso: Dec-25-2020