Ukufundwa Kwemviko YeziGaba ZezInkwenkwe Zokugaya Ezigayiwe Ngokuz Vacuum

Iziphi Izinto Ezichaza Imviko YeziGaba ZezInkwenkwe Zokugaya Ezigayiwe Ngokuz Vacuum

Imviko yezi gaba zezincazelo zokugaya ezigayiwe ngokuz vacuum iyathe indawo lapho izinkwadi zihlukana kumthwalo wabo we-metallic ngokushesha kakhulu, ukugaya okungafanelekile, noma ukulahlekelwa komthwalo. Le ndlela ihlanganisa izinto ezintathu ebalulekile:

• Ubume bomthwalo phakathi kwezinkwadi ne-matrix (kudinga umkhawulo ozungezile we-40–60 MPa)
• Ukukhanya okwenzakalelayo kusebenzi (okuphakama kuka-650°C kusinquma ukuphazanyiswa kwebinder)
• Igeometri yokuqala kwe-diamond particle (ubude obufanele bokubonakala 30–40%)

Izivikeli zomphakathi (2024) zibonisa ukuthi izigaba ezobhrazelayo kuvacuum zihlukunyezwa ngokusheshayo kuka-25% kunazo ezisinteriwe ngeminyaka efanayo kodwa zabelana nokucophelela okuphindwe kabili kuma-hard-material applications.

Amahluko Omuhle Phakathi Kwe-Vacuum Brazed Nezinye Izingxenye Zokudiliza Kwe-Diamond

Ukubhrazela kuvacuum kwenza iziqondiso ezodwa zemetals emva kwesibindi esingama-2,200°F, ngaphandle kwezixhobo ezizinzileyo eziphatha i-diamonds ngendlela yokumelana noma izihlangu ezisinteriwe zisebenzisa i-powder metallurgy. Leli qiniso lika phinda libe yindlela eyodwa yokusebenza:

Umthawu	Ibhedwe ngemikhwezo weVacuum	Ezine Liphondolo	Sintered
Ubunzima Bokudiliza	85–110 MPa	30–50 MPa	70–95 MPa
Umphumela Wokusebenza Okuphezulu	620°C	400°C	750°C
Ishedi Lokugcina i-Diamond	82%	68%	91%

Lokhu kuchaza umsebenzi wokudonsa okuthile kwamabhiladi atholakala ngokubanjwa ngovacuum—ukudonsa kwezango kspeeda kabili 22% kodwa ukuphazanyiswa kwegonyama kshaya kabili 40% kunamabhiladi atholakala ngokusinda lapho kugcinwa isipungu.

Indima Yobude Bokucinezela Kwesilinganiso Se-Diamond Ekushintshaneni Kokuqeda

Ubude bokucinezela kwebhola le-Diamond kube yisisekelo sekusebenza, ukulawula ukushisa, nokwabiwa kwezinto:

• izinto ezine-40/50 mesh (0.3–0.4mm) zibonisa ukudonsa kwe-0.12mm/hr ekugcinweni kodwa zihlukumeza ekugcinweni kwamaglasa akhophele amaplastiki
• 80/100 mesh (0.15–0.18mm) ikhuphela ≤0.08mm/hr ukulahlwa kumakhasi ngemvuselelo ivelisa kuze kube lunge 35 m/min
• Amagriti angaphansi (200+ mesh) ibonakala <0.03mm/hr ukulahlwa emakhathini kanti inkinga yokudluliswa kwekholo yekholo ibili

Ukudibaniswa okulinganiselwe kwe-70/30 kwe-40/50 ne-80/100 mesh kukhuphela isilinganiso sangaphansi nge-18%, ngokwizikhali zomlando wemisebenzi (2023).

Kungani Ukukhula Kwe-Diamond Kuthinta Isilinganiso Se-Ukulahlwa

Ukukhula kwezindikima eziningi kusenela amathuba angaphezu kokugcina, okuchazela ukulahlwa kokuqala. Kodwa, uma kufika phezu kwe-35 ct/cm³ kuthinta ubunzima bwebhondi, okusiva ekusunguleni ngaphambi kwesikhathi. Isilinganiso esifanelekile se-25–30 ct/cm³ sikhuphela ubude bebusuku ngo-16% ngokulungisa ubunzima bomgcimbi nokugcina komkhawulo.

Ubunzima Bwebhondi Nobuziko Be-Busuku

Ubunzima beBinder, bekhiwe nge-Rockwell (HRC), buhla ukuphuma kwe-diamond kanye nokwakha kwezulu. I-binders ezinezimo (HRC 40+) zihlinza ukulahlekelwa kumathithi ababaxa njenge-quartzite kodwa ziyekela ukubonakala kwe-diamond, zakhula izidingo zokugcina. I-binders ezindaweni ezimbi (HRC 25–35) zinikeza ukubonakala okuhle kakhulu kongxenye yekonkreti, zilahlela ukukhanga kwesizulu ngama-12–18% (International Journal of Refractory Metals, 2022).

Ubuqotho beMicrostructure kanye Ngezindlela Zokulahlekelwa Ezilinganayo

Ukwahlukaniswa okungalingani kwe-diamond kwenza amaphuzu avamile okulahlekelwa okushisa kakhulu. I-diamonds ezibambileyo zilahlela ngaphezu kwezingu-2.3 ngoba ayihliki ngokulinganayo. Ukusinda okuphucoko kufakazela ukulingana kwe-±5%, ukususa i"hot spots" ezibingelela kwezingu-34% yezinhloso ezigcwele.

I-Concentration Ephezulu YeDiamond Ngaphakathi Kokuqhubeka Okulinganayo: Ukuqeqeshwa Kwezenzo

Noma amadiyamani akhulu kuvumela ukukhupha ngokugcwala, ukuhlelwa okulandelayo kusinika ubude bephondo. Izigaba ezine-30 ct/cm³ kanye nesilinganiso esihleli kahle ziyaphila kakhulu kunazo eziqalayo ezine-40 ct/cm³ ngokungaphelela 28% emthonjeni, zilungelela ukuthi amadiyamani athintane nawe athintane futhi ahlukanise izinkuni futhi zilungise indlela yokukhupha.

Izimo Zokukhupha Namaqobo Amasebenzisa Okunqamula Ukulahlekelwa

Ukukhupha Kwamanzi Kumbi Ukukhupha Okungashintshwa: Isiphumo KuBhubhu Obude

Ngokwesicwangciso kwi-Journal yaPhambili yeManufacturing Technology yaseNingizimu Afrika etholakala ngoPitshini, ukugcina okwephakathi kungakha izikithi ngaphakathi kwesikhathi esizodwa kangangokuthi kusebenzisa ngaphandle kwe coolant. Undima? I-coolant inake indawo ikhululekile ema-300 degrees Celsius. Lokhu kubaluleke ngoba izidimane eziqhubekayo ezizikithini zibanjwa kumgobo xa kusuke kube lula, okwenzela ukuthi zihlale kancane. Xa abasebenzisi bacinde i-coolant baya benze ngaphandle kwalokho, sibona okuqukethwe kakhulu. Isilinganiso sezidimane siqala ukuphazamiswa ngama-35% ngosuku ngokunjalo ngoba umthubi uphakeme ngendlela engavumelekile kuzo zonke izinqumilo eziphakeme phakathi kwezidimane nezixhobo. Lo hlelo luhlaza kakhulu emazingeni ekwakhiweni.

Umthelelo Wokugcina nokucinga: Imiphikiswano Yomlando Weziga

Ukusebenzisa kakhulu kunesikhathi esingaphezu kwe-3,800 RPM kusungulisa izivivinyo ezingu-9.2 G zomthwalo waphandle, okukhathazeka kwisandla sokudluliswa kwebhindi yesidimini. Kwi-concrete ephunyukiywe, i-2,500–3,200 RPM iyanciphisa ukucindezelwa ngokushesha, ukufinyelela ku-1.2 imitha yokuqeda ngayigrama yenhlamvulo yokudlala (Ukuhlolwa Kwesimo Sezinhlelo Zokudlala, 2024). Iziphumayo ezikhulu zikhiqiza iziqhamo ezincane kwisandla sokubhazela, kodwa i-RPM encane ikhuthaza ukugcwaliseka.

Ukucindezela Okusekelwe Nenani Lokulaya Ngokuhlanganiswa Nezilingo Zokucindezela

Inani lokulaya le-15–25 cm/min ngecindezelwano le-8–12 kg libe yilapho kunciphisa ukucindezela okungafani kumasegmenti atholakalayo ngokubhazelwa ngovacuum. Ukuphulaphula kukhuthaza ukucindezela ngokungafani kabangama-40–70%, ikakhulukazi emaliweni we-C450 yebhindi. Ukugcina ubuningi becindezelwano-kuye-nhlamvulo-yobude: 1.4:1 (kg:mesh) buqinisekisa ukugcinwa kwezici ezizodwa futhi kuvikela ukwahlukana kwebhindi.

Ukulingana Kwemali Nekhono Yokubhazela Ngokuchaza Izinkinga Ezibalulekile Zokucindezela

Indlela Osebenzela Ngayo Imali Yesebe Isenzela Ukucindezela Kwamasegmenti Atholakalayo Ngokubhazelwa Ngovacuum

Ubuchwepheshe bokwelapha nokugaya kwenza kube lula ukulwa. Ukugcina izinkulungwane eziphezulu kwenza ukuthi kuqike ngaphezulu kwezikhathi ezintathu kunemvelo yekonkreti enkanyaziywa (Ibhuku leDiamond Tooling, 2023), okunyusa ukuguquka kwe-diamond ku-graphite. Lokho kusenzo kwezikludu ezizenzakalayo kwe-asphalt ezenziwa kwi-quartzite kwenza ukuthi ukulwa kube nengcinga engafani futhi kube nenhlaziyweni yomkhawulo.

Ukufaka Iziciko Zesikludu Ngokulinganiselana Nezidingo Zokusebenzisa

Isilinganiso esifanele sasediamanti (10–35% ngemoto) sibala isivinini nesilungiselele sangaphandle kokushisa. Izikludu ezifanelekile ekugcineni igrenayithi ngamanzi zidinga izimphindo ezinzima (HRC 55–60), ngelixa izixhobo ezisetyenziswa ekugcineni ilimesthon ngaphandle kwamanzi zisebenzisa HRC 45–50. Idatha yesifondla ibonisa ukuthi ukulinganisa ngokucophelela kusiza ekupheliseni ukubuyisela amasegmente ngaphezu kuka-60% kunazo ezinye izinkinga.

Ubukhona Bokuphuhlisa Kwesikludu Nempilo Yobudlelane Obuthile

Ukungqondakali komthwalo wendawo yomthwalo phakathi kwesiphumo sokuphuhlisa kwenza izindawo ezingahlali zibe nomthelela omubi wekugcina kwezidiamanti. Okuqukethwe kumele kubukeke:

Ifaktara Yokuphuhlisa	Isilinganiso esihle	Ungcinwa Wokuhlukunyezwa Kuphela
Ubunzima Bokushisa	±15°C	kuphinde kabili ukongezwa kwebhubhu yobudlelane
Isikhathi Sokuqina	2–5 iminithi	ukupheleka kwegunyana elingu-50%

Ukubona Kwedatha: 40% Kwezimbono Zokufa Ekudaleni Kuhlukaniswe Ngezinqumo Ezimbi Ze-Brazing

Ukuchazwa kweBhulungu LebhaZingaKwaseMzini ngo-2023 kwakubonisa ukuthi izigaba ezingu-11.4% zifayela ngaphakathi kwezinkathazo ezi-50 uma izikhala ziyakhula kune-5% yendawo yeqiniso. Ngokuphambene, ezinezinkinga ezingaphansi kwe-1% zazilondoloza ubunzima beyondiza kuzinkathazo ezi-300 kumshindo wokugaya.

Isikhombisi Sokuqala

Yiziphi i-vacuum brazing futhi iyenzelani kanjani ekugayeni kwezihlalo zeblades zika-diamond?

Uku-braze kwe-vacuum yindlela ethinta iziqhamo ze-diamond ne-metals ebandakanya ngokushesha okuphakade. Iyenzelana nokugaya ngokunikeza amandla aqinile emsindini, kuyakhoza izihlalo zikugaye kakhulu ngosizo kodwa kuyenika ubuncane obukhulu.

Yiziphi izimo ezifanele zokusebenza kwezihlalo ze-diamond ezi-braze kwe-vacuum?

Ukuze ubekelwe kakhulu kweziciqina yokugcina futhi kube yindebe kwezivivinyo ze-diamond ezi-brazed, kucashunywa ukuthi usebenzise izixwayiso zokulahla ukuze kugcinwe ngamanzi, uvikele amathuba okusebenza phakathi kuka-2,500–3,200 RPM kwi-concrete ephunyukayo, futhi usebenzise indlela efanayo yokugcina ngaphansi ngokulinganayo nezibhobho ze-diamond.

Isize ye-diamond yisiphi isimo sokugcinwa?

Isilinganiso seziphazamiso ze-diamond sibala isimo sokugcinwa ngokwenza kahle nokuphatha umthwalo. Iziphazamiso ezinkulu zisebenza kahle kwi-concrete, kodwa i-microgrits zifanele kumaterials we-ceramic kodwa zidinga izixwayiso eziningi zokulahla ukuze kugcinwe umthwalo.