Koj puas tau ntsib ib qho xwm txheej ntawm hauv pem teb kev lag luam uas qhov tseem ceeb stainless hlau valve qia tsis kam budge thaum muaj xwm ceev kaw lossis pib, zoo li nws tau welded rau hauv qhov chaw? Los yog tej zaum koj tau tawm tsam nrog stainless hlau bolts qhov twg cov xov tau ntes, ua rau cov khoom seem?
Qhov tshwm sim no yog qhov peb tab tom dhia mus rau niaj hnub no: galling lossis txias vuam. Nws yog ntau tshaj li kev ntxhov siab; nws ua rau cov nqi poob qis, kev siv nyiaj ntau ntxiv, thiab tuaj yeem ua rau muaj kev nyab xeeb tseem ceeb.
Lub Mechanism ntawm Galling
Stainless hlau yog renowned rau nws superior corrosion kuj, ib tug khoom muab tau los ntawm ib tug nyias, passive zaj duab xis ntawm chromium oxide ntawm nws nto. Txawm li cas los xij, nyob rau hauv cov xwm txheej tshwj xeeb, txheej tiv thaiv no tuaj yeem ua tsis tiav.
Galling yog qhov tseem ceeb ntawm daim ntawv nplaum hnyav heev. Thaum ob lub stainless hlau nto, xws li lub valve qia thiab nws bushing los yog ib tug ntsia liaj qhov rooj thiab txiv ntseej, raug rau siab thiab kev sib txhuam, cov txheej txheem unfolds nyob rau hauv peb theem sib txawv:
Kev tawg ntawm Passive Layer:Lub siab ntawm cov ntsiab lus sib cuag yog txaus rau rupture cov chromium oxide zaj duab xis, nthuav tawm cov liab qab, reactive hlau substrate.
Khoom-Lub Xeev Vuam:Cov cua sov tsim los ntawm kev sib txhuam, uas tuaj yeem ua rau kub hnyiab tau sai heev thaum lub sij hawm siab - ceev ceev, softens cov khoom ntawm cov ntsiab lus sib cuag. Nyob rau hauv kev kub siab, hlau atoms ntawm ob qhov chaw diffuse rau ib leeg, tsim microscopic txias welds.
Tearing thiab qaug dab peg:Raws li kev txheeb ze txuas ntxiv mus, cov welds txias no raug quab yuam sheared. Qhov no ua rau cov ntaub ntawv hloov pauv ntawm ib qho chaw mus rau lwm qhov, lossis cov khoom tawg ntawm cov hlau tawg hauv cov xov tshem tawm, thaum kawg ua rau cov khoom tawg tag.
Nyob rau hauv luv luv, stainless hlau zoo welds nws tus kheej nyob rau hauv siab thiab kev sib txhuam.
Hauv paus ua rau Galling
Cov khoom siv tsis zoo sib xws:Pairing zoo tib yam qib ntawm stainless hlau, piv txwv li, ib tug 304 ntsia liaj qhov rooj nrog ib tug 304 txiv ntseej, nthuav cov kev pheej hmoo siab tshaj. Vim lawv cov qauv siv lead ua zoo sib xws thiab cov khoom siv tshuaj lom neeg, cov atoms muaj kev cuam tshuam rau kev sib tshuam -diffusion.
Kev ua haujlwm yuam kev:Siv cov cuab yeej hluav taws xob rau siab - ceev ceev ua kom muaj kev sib txhuam ntau dhau tam sim ntawd, ua kom nrawm nrawm ntawm cov txheej txheem galling. Tsis tas li ntawd, misalignment thaum lub sij hawm installation tsim eccentric loading, uas exacerbates localized hnav.
Poor Surface Condition:Burrs ntawm xov xov, residual hlau shavings los ntawm machining, los yog tej yam microscopic imperfections ua raws li kev ntxhov siab concentrators. Cov teeb meem no ua txhaum cov zaj duab xis tiv thaiv ntxov ntxov, pib galling.
Kev tiv thaiv thiab txo cov tswv yim
Txhawm rau tiv thaiv galling, peb tuaj yeem siv cov kev tiv thaiv zoo thiab kho kom raug.
Optimize Material Xaiv:Qhov no yog qhov kev daws teeb meem tseem ceeb tshaj plaws.
Dissimilar Pairing:Tsis txhob siv cov qib stainless hlau zoo tib yam. Piv txwv li, ua ke ib qho austenitic stainless hlau zoo li 304 nrog martensitic stainless hlau zoo li 410 tuaj yeem txo qhov kev pheej hmoo ntawm galling.
Tshwj xeeb Alloys:Rau cov kev pabcuam huab cua, xav txog cov alloys tshwj xeeb uas tsim los rau kev tiv thaiv -galling zog. Ib qho piv txwv tseem ceeb yog Nitronic 60, tseem hu ua XM-16. Qhov no nitrogen-strengthened austenitic stainless hlau muaj qhov tshwj xeeb tsis kam rau galling thiab hnav, ua rau nws yog ib qho kev xaiv zoo tshaj plaws rau cov khoom tseem ceeb xws li li qub thiab twj.
Refine Assembly Cov txheej txheem:Kev ua haujlwm kom raug yog qhov tseem ceeb rau kev tiv thaiv.
Tswj Ceev thiab Torque:nruj me ntsis zam lub hwj chim wrenches. Es tsis txhob, siv torque wrenches los yog socket wrenches rau qeeb, meej installation. Peb pom zoo kom ceev ceev hauv qab 25 rpm.
Xyuas kom Alignment:Xyuas kom cov ntsia liaj qhov rooj thiab cov txiv ntoo axes zoo sib xws thaum lub sijhawm teeb tsa kom tsis txhob muaj kev sib tsoo.
Siv Lubrication thiab Surface Treatments:Ntxiv ib qho kev tiv thaiv rau cov kev sib txhuam.
Siv Lubricants:Txheej xov nto nrog molybdenum disulfide, graphite-raws li lubricants, los yog tshwj xeeb los tiv thaiv- ntes cov tebchaw zoo cais cov hlau ncaj qha- rau-hlau sib cuag thiab txo cov cua sov.
Nto Coatings:Plating Cheebtsam nrog tooj liab lossis nyiaj kuj tuaj yeem txo qhov coefficient ntawm kev sib txhuam.
Ua raws li kev tswj hwm lub neej:
Tib -Siv Txoj Cai:Rau qhov tseem ceeb stainless hlau fasteners, nws yog advisable tsis txhob rov qab siv lawv tom qab disassembly.
Cool Down Ua ntej Disassembly:Rau cov cuab yeej ua haujlwm ntawm qhov kub thiab txias, ib txwm tos kom txog thaum nws txias rau qhov kub thiab txias ua ntej sim disassembly.
Los ntawm kev nkag siab txog cov txheej txheem ntawm galling thiab siv cov kev ntsuas dav dav no, peb tuaj yeem txo qhov tshwm sim ntawm qhov kev sib tw ua lag luam no, ua kom lub sijhawm ntev - ruaj khov thiab kev ntseeg siab ntawm koj cov cuab yeej siv.
