Vim li cas stainless hlau screws thiab txiv ntseej tsis pom zoo kom siv ua ke hauv qee yam xwm txheej?

Hauv kev lag luam sib dhos thiab cov khoom siv tu, cov lus hais tias "stainless steel screws yuav tsum tsis txhob siv nrog cov txiv ntseej stainless" tau nyob ib puag ncig ntev. Nws yog ib qho tseem ceeb uas yuav tsum tau hais txog tias qhov no tsis yog qhov txwv tsis pub, tab sis yog cov ntsiab lus ntawm engineering kev paub txog kev pheej hmoo tsis ua haujlwm raws li kev ua haujlwm tshwj xeeb. Qhov teeb meem tseem ceeb yog "gagging phenomenon" ntawm stainless hlau fasteners.

 

Hauv cov ntawv thov xws li cov raj xa hluav taws xob cryogenic flanges, cov hlab ntsha siab, thiab cov khoom siv tshuaj, thaum stainless hlau bolts thiab txiv ntseej tau ua haujlwm rau lub sijhawm ntev nyob rau hauv cov xwm txheej siab ua ntej, kev sib hloov loj heev lossis txawm tias tsis muaj peev xwm tshem tawm lawv feem ntau tshwm sim thaum lub sij hawm disassembly.

 

Qhov teeb meem no yog tshwj xeeb tshaj yog nyob rau hauv static load, tsis muaj lubrication, thiab tib yam khoom mating tej yam kev mob.

 

 

Los ntawm cov ntaub ntawv tshawb fawb pom, stainless hlau muaj qhov zoo ductility thiab tsis tshua muaj qhov tawv tawv. Thaum stainless hlau screws thiab ceev yog nruj, lub passivation zaj duab xis nyob rau hauv threaded tiv tauj nto yog yooj yim puas nyob rau hauv kev sib xyaw ua ke ntawm kev kub siab thiab kev sib txhuam kub, thiab cov hlau raug matrix ces undergoes microscopic adhesion. Raws li kev sib hloov txuas ntxiv, qhov adhesion rov tshwm sim thiab raug txiav, nws thiaj li ua rau thaj chaw "txias vuam" ntawm cov xov.

 

Tsis tas li ntawd, thaum lub sij hawm ntev - kev pab cuam, fasteners undergo me ntsis yas deformation nyob rau hauv load, ua rau threaded pob qij txha txawm nruj thiab ntxiv amplifying cov kev sib txhuam. Thaum sim disassemble nyob rau hauv thim rov qab, nws yog tsim nyog los kov yeej tsis tau tsuas yog cov pa kev sib txhuam quab yuam, tab sis kuj ntxiv kuj generated los ntawm cov khoom adhesion thiab cov yam ntxwv deformation, yog li no ho nce qhov nyuaj ntawm disassembly.

 

 

Txhawm rau txo txoj kev pheej hmoo ntawm kev txeeb hauv cov hlau tsis muaj steel, cov hauv qab no feem ntau siv hauv kev xyaum ua haujlwm:

 

Ua ntej, qhov tshwm sim ntawm adhesion tuaj yeem raug txo los ntawm kev siv cov ntaub ntawv sib txawv, xws li siv stainless hlau bolts nrog tooj liab txiv ntseej lossis saum npoo -kho txiv ntoo, rhuav tshem cov adhesion ntawm tib yam khoom ntawm cov khoom siv.

 

Qhov thib ob, lubricating cov xov nto ua ntej sib dhos yog ib txoj hauv kev zoo tshaj plaws. Cov roj nplua nyeem feem ntau suav nrog roj, graphite, molybdenum disulfide, tiv thaiv -tshuaj cov neeg ua haujlwm, lossis siv quav ciab impregnation. Cov kev ntsuas no tuaj yeem txo qhov coefficient ntawm kev sib txhuam thiab txo qhov kub nce.

 

Qhov thib ob, nyob rau hauv siab - kub los yog siab - load ib puag ncig, tshwj xeeb los tiv thaiv - ntes cov neeg ua hauj lwm yuav tsum tau siv tshwj xeeb los tiv thaiv sintering los yog adhesion tsis ua hauj lwm nyob rau hauv siab kub tej yam kev mob.

 

 

Piv nrog rau cov pa roj carbon steel fasteners, stainless hlau fasteners muaj ntau dua rau kev xauv, feem ntau vim qhov sib txawv ntawm cov khoom siv. Ua piv txwv cov hlau tsis muaj steel, nws qhov hardness feem ntau qis dua li ntawm 8.8 qib carbon steel, tab sis nws cov ductility zoo dua. Thaum cov xov nto puas lawm, stainless hlau sai sai tsim ib tug tshiab oxide zaj duab xis los tiv thaiv corrosion. Txawm li cas los xij, thaum lub sij hawm nruj, cov oxide zaj duab xis no txuas ntxiv rhuav tshem thiab rov tsim dua tshiab, tsim cov tshuaj tiv thaiv ntawm "kev puas tsuaj- adhesion-shear-re-adhesion," thaum kawg ua rau kev kaw.

 

Qhov tshwm sim no tshwj xeeb tshaj yog nyob rau hauv stainless hlau, aluminium alloy, thiab titanium alloy fasteners, thaum nws qhov tshwm sim yog qhov tsawg ntawm cov hlau fasteners nrog ntau dua hardness thiab qis dua ductility.

 

 

Hauv kev siv tswv yim, cov teeb meem xauv feem ntau tsis yog tshwm sim los ntawm ib qho, tab sis qhov tshwm sim ntawm ntau yam kev ua haujlwm yuam kev. Piv txwv li, cov cuab yeej cuab yeej tsis sib haum ntawm cov ntsia hlau thiab cov txiv ntoo, muaj cov burrs lossis hlau shavings ntawm cov xov nto, los yog quab yuam ntau dhau los yog ceev ceev ceev thaum lub sij hawm teeb tsa tuaj yeem ua rau muaj kev pheej hmoo ntawm kev ntes.

 

Thaum siv hluav taws xob ciaj ntswj rau siab - ceev ceev, qhov kub ntawm cov xov tooj sib txuas tau nce siab hauv lub sijhawm luv luv, uas yog ib qho ntawm cov laj thawj ntawm kev ntes tam sim ntawd.stainless hlau fasteners. Tsis tas li ntawd, tsis ua hauj lwm kom cov txiv ntoo perpendicular mus rau lub bolt axis los yog tsis ua hauj lwm siv lub tshuab ntxhua khaub ncaws los yog lub caij nplooj ntoos hlav ntxhua khaub ncaws tuaj yeem ua rau muaj kev ntxhov siab hauv cheeb tsam, yog li inducing seizing.