1. Hom Corrosion thiab lawv tsom ntsoov rau kev tiv thaiv
Rail fastener corrosion ntog rau hauv peb pawg nrog sib txawv kub qhov chaw thiab kev tiv thaiv. Electrochemical corrosion tshwm sim qhov twg cov hlau qhov chaw hu rau ib tug electrolyte; Nws nquag nyob rau hauv ntug dej hiav txwv ntsev- thaj chaw tshuaj tsuag, thaj chaw ntub dej nag thiab cov ntu dej hauv qhov av. Lub hom phiaj tiv thaiv yog cuam tshuam cov electrochemical cell: insulating txheej uas cais cov electrolyte, thiab anti-corrosion washers uas tiv thaiv galvanic kev sib cuag ntawm cov hlau tsis sib xws. Atmospheric corrosion tshwm sim los ntawm kev sib xyaw ua ke ntawm cov pa oxygen, dej vapor thiab cov pa phem, thiab yog qhov hnyav tshaj plaws hauv kev lag luam muaj kuab paug thiab smog; kev tiv thaiv tseem ceeb yog txhim kho oxidation thiab huab cua tsis kam ntawm qhov chaw, siv cov txheej txheem xws li kub-dip galvanizing thiab zinc flake txheej. Tshuaj corrosion yog tshwm sim los ntawm kev tawm tsam ncaj qha los ntawm cov kua qaub los yog alkali daws, feem ntau ntawm cov kab nyob ib ncig ntawm cov chaw ua si tshuaj los yog nyob rau sab qaum teb lub caij ntuj no kab uas ntsev kis rau de-icing; ntawm no cov lus teb yog kua qaub- thiab alkali- cov ntaub ntawv resistant xws li stainless fasteners los yog chemically resistant coatings. Txias-thaw kev caij tsheb kauj vab hauv thaj tsam alpine ua rau tag nrho peb lub tshuab thiab yuav tsum tau ua nrog kev sib xyaw ua ke los tiv thaiv{12}} khov thiab tiv thaiv- kev ntsuas corrosion.
2. Mechanical and Chemical Anti-Loosing
Anti-loosing thev naus laus zis faib rau hauv tsev neeg siv tshuab thiab tshuaj lom neeg. Mechanical txoj kev kaw cov xov khub nrog ib tug qauv: lub caij nplooj ntoos hlav ntxhua khaub ncaws tuav preload los ntawm nws elastic cov tshuaj tiv thaiv quab yuam thiab suits qis - kab vibration; lub xauv lub tshuab ntxhua khaub ncaws txwv tsis pub sib hloov los ntawm cov tabs koom nrog lub ntsia liaj qhov rooj thiab cov txiv ntoo, thiab siv rau ntawm qhov tseem ceeb fasteners ntawm siab - kab ceev; lub cotter pin nrog slotted txiv ntseej lub cev kaw lub txiv ntoo tom qab zawm thiab siv qhov kev vibration hnyav, xws li hnyav- tsheb ciav hlau. Cov txheej txheem siv tshuab yog ib qho yooj yim rau disassemble thiab rov-tighten, uas suits cov kab uas nquag tu.
Cov txheej txheem tshuaj kho cov xov nrog lub zog sib txuas. Anaerobic xov-xauv nplaum yog siv rau cov xov ua ntej sib dhos thiab kho rau hauv siab - lub zog daim ntawv cog lus uas tiv thaiv kev co; ua ntej-coated bolts nqa cov nplaum los ntawm lub Hoobkas, ua kom yooj yim ntawm qhov chaw ua haujlwm, thiab tau dav siv rau siab - ceev fasteners uas standardization siab. Kev ntsuas tshuaj lom neeg siv sijhawm ntev dua ntawm kev cuam tshuam, tab sis disassembly yuav tsum tau cua sov lossis siab dua torque, yog li kev xaiv ntawm ob tsev neeg yuav tsum ua raws li txoj kab kev tu ntau zaus thiab kev vibration siv.
3. Txheej Txheej Ntxiv Sealing Composite System
High-Speed rail fasteners siv ntau- txheej tiv thaiv -corrosion system nrog plaub qhov kev sib txuas. Ua ntej, substrate pretreatment: tua blasting derusts saum npoo thiab tswj roughness ntawm Ra 25-50 μm rau thauj tog rau nkoj txheej. Thib ob, lub hauv paus txheej: zinc-aluminium pseudo- alloy txheej siv los ntawm cov tshuaj tsuag thermal rau 50-80 μm thickness, uas muab kev tiv thaiv kev txi anode (cathodic). Thib peb, lub tsho loj nruab nrab: ib qho epoxy primer ntawm 20-30 μm uas cais cov substrate los ntawm corrosive media. Plaub, nto sealing: silicone sealant nyob rau hauv qhov khoob ntawm cov khoom siv fastener, thiab lub kaus mom tiv thaiv corrosion yog haum rau lub taub hau taub hau thiab txiv ntseej kom ua tiav kev tiv thaiv tag nrho.
Lub kaw lus ua haujlwm los ntawm kev sib txuas ob lub cev thaiv kev tiv thaiv nrog kev tiv thaiv cathodic: ntau - txheej txheej thaiv cov dej thiab oxygen los ntawm sab nraud, cov zinc txheej fij - txhuas txheej tiv thaiv lub substrate txawm tias cov txheej txheej hauv zos puas, thiab cov kauj ruam sib khi tshem tawm cov kev sib tsoo ntawm qhov sib tsoo - qhov tsis muaj zog ntawm cov khoom sib dhos feem ntau. Nyob rau hauv cov ntug dej hiav txwv thiab qhov chaw ntub dej no txuas ntxiv tiv thaiv - lub neej corrosion los ntawm li 8 xyoo rau cov txheej txheem zoo tib yam mus rau ntau tshaj 20 xyoo, nrog rau kev poob qis hauv kev saib xyuas.
4. Ua ntej-Tightening Torque Control
Lub zog torque tsis raug ncaj qha cuam tshuam rau kev tiv thaiv -loosing kev ua haujlwm. Lub zog me me dhau los ua ntej tsis txaus, yog li cov xov khub swb hauv lub tsheb ciav hlau kev co thiab loosens; ntau torque plastically deforms lub ntsia liaj qhov rooj, puas lub xov profile, thiab lub preload poob lawm - thaum overstressing clip yuav ua rau qaug zog tsis ua hauj lwm. Precise control muaj peb yam. Khoom siv: digital torque wrenches lossis ntse torque systems nrog qhov tseeb ntawm ± 3% thiab tiag - lub sij hawm tawm tswv yim ntawm cov ntaub ntawv nruj. Cov txheej txheem: peb txoj kev - kauj ruam - pib zawm mus rau 50% ntawm kev tsim torque kom kaw cov qhov khoob khoob, rov- zawm rau 80% rau txawm tias qhov kev ntxhov siab, thiab qhov kawg nruj rau tus tsim tus nqi tuav rau 3-5 vib nas this. Kev pov thawj: lub zog torque- lub kaum sab xis qauv ntsuas lub kaum ntse ntse los txiav txim siab ua ntej, nrog rau qhov piv txwv tsawg kawg yog 5% ntawm cov kab siab - nrawm thiab 10% ntawm cov tsheb ciav hlau hnyav. Cov cuab yeej torque yuav tsum tau ntsuas tsis tu ncua, thiab thaum ambient kub qis dua -10℃tus nqi torque yuav tsum tau nce ntxiv kom ruaj khov ua ntej.
5. Alpine thiab siab -Kev ntsuas qhov siab
Alpine thiab siab- kab qhov siab sib xyaw ua ke tsis tshua muaj kub, muaj zog ultraviolet hluav taws xob, qhov kub thiab txias sib txawv thiab hnyav cua thiab daus, yog li cov fasteners xav tau qis dua - kub tsis kam, UV tsis kam thiab ruaj khov. Rau corrosion: siv qis- kub zinc- aluminium coatings uas ua kom adhesion ntawm -50℃yam tsis muaj nkig tawg lossis tev; siv cov fluorocarbon topcoat uas nws UV aging kuj yog li peb zaug ntawm cov txheej txheem zoo tib yam; thiab siv tsawg-kub elastic sealants uas tsis ntsws thiab tawg nyob rau hauv qhov kub thiab txias sib txawv, tiv thaiv daus thiab noo noo ingress. Rau loosening: muab ob chav ntxhua khaub ncaws (lub caij nplooj ntoos hlav ntxhua khaub ncaws ntxiv rau lub tshuab ntxhua khaub ncaws) nrog rau qis -kub xov-locking nplaum uas ua kom lub zog sib txuas ntawm -40℃; siv cov khoom siv kub uas tsis tshua muaj siab tawv xws li 35CrMoA alloy steel kom tsis txhob tawg tawg; thiab nce lub pre-tightening torque los ntawm 10-15% los them rau qhov kev hloov ntawm cov khoom elastic modulus ntawm qhov kub thiab txias. Ultrasonic kuaj ntawm bolt sab hauv kev ntxhov siab ntawm lub voj voog tsis tu ncua pom kev qaug zog ua ntej tsis ua haujlwm thiab yog txoj hauv kev pom zoo rau qhov chaw huab cua.
6. Cov ntsiab lus xaiv thiab tshuaj xyuas
Rau ib pab neeg yuav khoom, cov lus nug uas siv tau yog: cov chav kawm corrosion puas yog cov kab ntawm (nqaij ntug dej hiav txwv, kev lag luam, tshuaj, de-icing lossis alpine), uas tiv thaiv - txoj kev xoob xoob zoo li kev tswj hwm kev tswj hwm, thiab seb cov ntaub ntawv tshwj xeeb ntawm txheej txheej txheej txheej los ntawm txheej - roughness range, txheej thickness, sealing hom. Nyob rau ntawm qhov chaw, tshuaj xyuas cov fasteners rau xeb streaks ntawm threads thiab nyob rau hauv washers, txheej puas ntawm clip ntiv taw thiab ntsia liaj qhov rooj hau, thiab torque poob ntsuas nrog ib tug calibrated ciaj ntswj. Hloov corroded fasteners nrog tib txheej txheej; sib tov ib qho khoom seem uas tsis muaj kev tiv thaiv rau hauv ib qho kev tiv thaiv kab rov ua dua qhov kev sib txuas tsis muaj zog thiab ua rau lub neej luv ntawm tag nrho cov seem.
FAQ
Q1: Hom kev xeb twg yog nyob rau hauv cov cheeb tsam ntug hiav txwv?
Electrochemical corrosion los ntawm ntsev tsuag; Lub hom phiaj tiv thaiv yog insulating coatings, galvanic cais washers thiab ib tug tag nrho txheej ntxiv sealing system.
Q2: Dab tsi yog qhov txawv ntawm txhua yam thiab tshuaj tiv thaiv -loosing?
Mechanical txoj kev (caij nplooj ntoos hlav ntxhua khaub ncaws, xauv lub tshuab ntxhua khaub ncaws, cotter pin) xauv cov xov los ntawm cov qauv thiab yooj yim rau disassemble; chemical method (anaerobic adhesive, pre-coated bolts) khi cov xov thiab kav ntev dua ntawm kev cuam tshuam.
Q3: Vim li cas cov txheej txheem sib xyaw ua haujlwm ntev tshaj 20 xyoo?
Lub zinc-aluminium sacrificial txheej (50-80 μm) ntxiv rau epoxy intermediate coat (20-30 μm) ntxiv rau silicone sealing muab ob npaug rau thaiv nrog cathodic tiv thaiv thiab tshem tawm crevice corrosion, qhov qub tsis ua hauj lwm taw tes.
Q4: Txoj kev nruj nruj yog dab tsi?
Txoj kev peb - kauj ruam: 50% ntawm tus qauv tsim torque, ces 80%, ces tus nqi tsim nyob rau 3-5 vib nas this, siv lub calibrated digital torque wrench nrog ± 3% raug.
Q5: Yuav ua li cas preload txheeb xyuas tom qab zawm?
Los ntawm txoj kev torque- lub kaum sab xis ntawm tus qauv ntawm yam tsawg 5% ntawm cov fasteners ntawm siab - kab ceev thiab 10% ntawm hnyav- cov kab.
Q6: Cov khoom siv dab tsi haum rau qhov kub thiab txias?
Tsawg- kub tawv alloy hlau xws li 35CrMoA, nrog ua ntej- zawm torque nce 10-15% thiab kuaj ultrasonic ntawm kev ntxhov siab sab hauv ntawm lub voj voog tsis tu ncua.