Zvakadini nemhedzisiro yekukwevera yechoto chevacuum brazing

Zvakadini nemhedzisiro yekukwevera yechoto chevacuum brazing

Nzira yekubatidza muchoto chevacuum inzira itsva yekubatidza isina kutenderera pasi pemamiriro evacuum. Nekuti kubatidza kuri munzvimbo isina kutenderera, mhedzisiro inokuvadza yemhepo pabasa inogona kubviswa zvinobudirira, saka kubatidza kunogona kuitwa zvinobudirira pasina kushandisa flux. Inonyanya kushandiswa kune simbi dzekubatidza nesimbi dzakaoma kubatidza, dzakadai sealuminium alloys, titanium alloys, high-temperature alloys, refractory alloys uye ceramics. Joint yakabatidzwa yakajeka uye diki, ine hunhu hwakanaka hwemakanika uye inodzivirira ngura. Midziyo yekubatidza yevacuum kazhinji haishandiswi pakushongedza netsanga yesimbi yekabhoni nesimbi isina kutenderera.

Midziyo yekubikisa muchoto chevacuum inonyanya kugadzirwa nechoto chevacuum brazing uye system yekubikisa. Kune mhando mbiri dzezvitofu zvekubikisa: Chitofu chinopisa nechitofu chinotonhora. Mhando mbiri dzezvitofu dzinogona kudziiswa negasi rechisikigo kana kupisa kwemagetsi, uye dzinogona kugadzirwa kuita chimiro chechoto chakaiswa padivi, chitofu chakaiswa pasi kana chimiro chechoto chakaiswa pamusoro (rudzi rweKang). Sisitimu yekubikisa inogona kushandiswa zvakazara.

Sisitimu yekubvisa mafuta inosanganisa vacuum unit, vacuum pipeline, vacuum valvu, nezvimwewo. Vacuum unit inowanzo gadzirwa ne rotary vane mechanical pombi uye oil diffusion pombi. Mechanical pombi yega inogona kuwana pasi pe 1.35 × Vacuum degree ye 10-1pa level. Kuti vacuum iwane vacuum yakakwira, oil diffusion pombi inofanira kushandiswa panguva imwe chete. Panguva ino, inogona kusvika 1.35 × Vacuum degree ye 10-4Pa level. Kumanikidzwa kwegasi musystem kunoyerwa ne vacuum gauge.

Kuisa simbi muchoto chevacuum zvinoreva kuisa simbi muchoto kana mukamuri rekuisa simbi nemhepo yakabviswa. Yakakodzera zvakanyanya kuisa simbi huru uye dzinoenderera mberi, uye yakakodzerawo kubatanidza simbi dzakakosha, dzinosanganisira titanium, zirconium, niobium, molybdenum uye tantalum. Ine mashandisirwo akasiyana-siyana. Zvisinei, kuisa simbi muchoto chevacuum kunewo matambudziko anotevera:

① Simbi iri nyore kuputika kana yaiswa mu vacuum, saka hazvina kukodzera kushandisa vacuum brazing pasimbi yekutanga nesimbi yekuzadza zvinhu zvinoputika. Kana zvichidikanwa, matanho akaomarara anoenderana nawo anofanira kushandiswa.

② Kubata simbi ne vacuum brazing kunonyatsoenderana nekuoma kwenzvimbo, kunaka kwekubatanidza zvinhu uye kushivirira kwazvinoita simbi ne brazing, uye kunoda nharaunda yepamusoro yekushanda nevashandi.

③ Midziyo yekubvisa tsvina yakaoma, ine mari yakawanda inoshandiswa kamwe chete uye mari yakawanda yekugadzirisa.

Saka, maitiro ekushandisa nzira yekuisa brazing mu vacuum furnace? Kana brazing ichiitwa mu vacuum furnace, weldment inofanira kuiswa muvira (kana mumudziyo we brazing), gonhi revira rinofanira kuvharwa (kana chifukidziro chemudziyo we brazing chinofanira kuvharwa), uye choiswa vacuum usati wapisa. Tanga pombi yemakanika kutanga, tendeudza vhiri rekufambisa mushure mekunge vacuum grade yasvika 1.35pa, vhara nzira yakananga pakati pepombi yemakanika nevira re brazing, gadzira pombi yakabatana nevira re brazing kuburikidza nepombi ye diffusion, vimba nepombi yemakanika ne diffusion kuti ishande mukati menguva pfupi, pomba brazing furnace kusvika padanho re vacuum rinodiwa, wobva watanga simba rekupisa.

Munguva yese yekukwira nekudziya kwekupisa, vacuum unit inofanira kuramba ichishanda kuchengetedza dhigirii re vacuum muchoto, kudzivirira kubuda kwemhepo panzvimbo dzakasiyana dze vacuum system nechoto che brazing, kuburitswa kwegasi nemhepo inonyungudika pamadziro echoto, fixture ne weldment, volatilization yesimbi ne oxide, nezvimwewo, kuitira kuderedza mhepo chaiyo. Kune mhando mbiri dze vacuum brazing: high vacuum brazing uye partial vacuum (medium vacuum). High vacuum brazing yakakodzera kwazvo pa brazing base metal ine oxide yakaoma kuora (senge nickel base superalloy). Partial vacuum brazing inoshandiswa panguva iyo base metal kana filler metal inoputika pasi pekupisa kwe brazing uye high vacuum conditions.

Kana paine matanho akakosha ekudzivirira kuchena kwakanyanya, nzira yekuchenesa vacuum inofanira kushandiswa usati waisa hydrogen brazing yakaoma. Saizvozvowo, kushandisa nzira yekuchenesa dry hydrogen kana inert gas usati waisa hydrogen kunobatsira kuwana mhedzisiro iri nani mukuisa hydrogen yakawanda.