Vim li cas Nto Kho Qhov Teeb Meem rau Railway Fasteners

Corrosion yog thawj tus yeeb ncuab

Thawj thiab pom tseeb yog vim li cas rau kev kho saum npoo yog corrosion. Lub caij nplooj ntoos hlav clip, ntsia hlau ntsia hlau los yog ntses ntsia liaj qhov rooj nyob rau hauv kev pab cuam yog raug rau ya raws, oxygen thiab chlorides los ntawm ntsev tsuag, ballast dej thiab de- icing chemicals, thiab cov electrochemical corrosion uas ua rau tshem tawm cov load- bearing seem ntawm ib feem. Qhov tshwm sim tsis yog xeb xwb: ib qho clip uas poob 20 feem pua ​​​​ntawm nws seem poob qhov tawv thiab clamping quab yuam, ib tug spike nrog pitted threads strips thaum re-tightened, thiab ib tug ntsia liaj qhov rooj nrog ib tug corrosion pit nyob rau hauv lub taub hau pib ib tug qaug zog tawg. Cov txheej txheem ua haujlwm los ntawm ob lub tswv yim: kev tiv thaiv kev tiv thaiv, qhov twg txheej txheej lub cev cais cov hlau los ntawm electrolyte, thiab cathodic tiv thaiv, qhov twg zinc corrodes nyiam thiab tiv thaiv cov hlau ntawm khawb thiab txiav ntug. Yog li ntawd, cov txheej txheem yuav tsum raug xaiv rau ob qho tib si tuab thiab adhesion, thiab tshawb xyuas ntawm qhov ua tiav, vim tias cov txheej txheem delaminates tsim cov kab mob corrosion phem dua li tsis muaj txheej txheej.

Friction Control thiab Thread Function

Kev kho deg kuj txiav txim siab li cas tus fastener behaves mechanically. Lub torque-rau-preload kev sib raug zoo ntawm lub bolted sib koom nyob rau hauv kev sib txhuam coefficient ntawm cov xov thiab lub ntsej muag bearing, thiab cov txheej yog lub ntsiab cuam tshuam rau qhov coefficient: kub -dip galvanized xov muaj ib tug sib txawv kev sib txhuam ntawm ib tug electroplated los yog ib tug zinc flake coated xov, thiab lubricated nyob rau hauv qhov chaw uas yuav tsum tau lubricated. Ib qho kev nkag siab tsis zoo yog tias zinc txheej ua rau cov xov khoob thiab yog li ua rau rub- tawm ntawm cov ntsia hlau ntsia hlau. Qhov tseeb qhov rub- tawm lub peev xwm ntawm cov ntsia hlau ntsia hlau los ntawm daim ntawv xov, qhov ntev ntawm kev sib koom tes thiab lub zog ntawm lub substrate, cov ntoo lossis cov dowel, tsis yog los ntawm cov txheej, thiab cov txheej thickness ntawm cov xov yog txhob txwm txwv, yog li tus spike tseem haum nws cov dowel thiab tuaj yeem ntsia tau rau hauv yam tsis muaj kev puas tsuaj. Qhov txheej txheem ua li cas ntawm cov xov yog tiv thaiv nws los ntawm corrosion thiab tswj kev sib txhuam thaum zawm; nws tsis ntxiv txhua yam tuav lub zog.

Txheej txheej txheem piv

Cov lus hauv qab no qhia txog cov txheej txheem kev tiv thaiv tseem ceeb uas siv rau hauv kev tsheb ciav hlau fasteners thiab lawv cov ntawv thov raug.

Kub-dip galvanizing tseem yog qhov kev xaiv tseem ceeb rau kev khiav tawm vim tias zinc- hlau alloy txheej bonds metallurgically rau cov hlau thiab muab tuab, tawv tiv thaiv. zinc flake txheej yog qhov zoo dua qhov uas qhov yuav tsum tsis txhob pom hydrogen, qhov twg cov txheej yuav tsum nyob twj ywm nyias rau cov xov tolerance, los yog qhov twg muaj kev sib txhuam coefficient xav tau rau torque- tswj kev teeb tsa. Zinc diffusion txheej, qee zaum hu ua sherardizing, muab ib qho nyuaj, zoo li zinc- txheej hlau uas haum rau lub caij nplooj ntoos hlav clips vim nws tsis cuam tshuam rau lub caij nplooj ntoos hlav npau taws thiab tiv thaiv kev puas tsuaj ntawm kev sib cuag ballast.

Hydrogen Embrittlement thiab High -Strength Fasteners

Ib qho kev txiav txim siab txheej tuaj yeem txhais tau tias qhov sib txawv ntawm lub ntsia liaj qhov rooj uas ua haujlwm nees nkaum xyoo thiab ib qho uas snaps tsis ceeb toom: qhov kev xaiv ntawm cov txheej txheem rau hardened fasteners. Electroplating qhia hydrogen rau hauv cov hlau, thiab ntawm bolts ntawm cov cuab yeej chav kawm 10.9 thiab siab dua, los yog nrog hardness saum toj no txog 390 HV, cov hydrogen tuaj yeem txav mus rau kev ntxhov siab thiab ua rau ncua kev puas tsuaj, tawg uas tshwm sim ntau teev lossis hnub tom qab lub ntsia liaj qhov rooj tau nruj. TS EN ISO 4042 Kev xyaum yuav tsum tau ua kom muaj kev ci ntsa iab tom qab electroplating, tab sis cov lus teb zoo tshaj plaws rau cov bolts yog kom tsis txhob electroplating tag nrho ntawm cov khoom tawv tawv thiab siv zinc flake txheej lossis kub -dip galvanizing, uas tsis qhia hydrogen. Tib lub logic siv rau lub caij nplooj ntoos hlav clips: lub caij nplooj ntoos hlav hardened hlau yog rhiab heev rau hydrogen, thiab cov txheej txheem xaiv yuav tsum tsis txhob raug embrittlement ntawm thaj chaw ua hauj lwm ntawm lub caij nplooj ntoos hlav.

Hnav, Abrasion thiab Tshwj Xeeb Case

Tshaj li corrosion thiab kev sib txhuam, kev kho deg yuav tsum muaj sia nyob ntawm cov neeg kho tshuab ib puag ncig ntawm kev khiav. Clips thiab bolts nyob ze ballast pom abrasion ntawm pob zeb hmoov av thiab tamping cov cuab yeej, yog li cov txheej yuav tsum tawv txaus kom nyob twj ywm; zinc diffusion thiab kub -dip txheej ua tau zoo, thaum nyias electroplating hnav los ntawm sai. Nyob rau ntawm qhov sib txuas ntawm cov hlau txuas thiab cov ntoo pw tsaug zog lossis cov yas dowel, cov txheej kuj ua raws li cov khoom sib cais uas txo cov galvanic thiab abrasive puas tsuaj rau lub substrate. Cov xwm txheej tshwj xeeb ua kom tiav daim duab: ntawm siab- cov kab nrawm, lub caij nplooj ntoos hlav clips feem ntau tiv thaiv nrog zinc diffusion txheej los yog zinc flake los ua ke nrog kev tiv thaiv corrosion nrog qaug zog- kev nyab xeeb; nyob rau hauv tunnels thiab ntug dej hiav txwv cog, stainless hlau fasteners rau ISO 3506 tshem tawm cov teeb meem corrosion nkaus ntawm tus nqi siab dua; thiab nyob rau hauv hluav taws xob rhiab heev - cheeb tsam hauv Circuit Court, cov txheej thiab cov khoom siv insulating yuav tsum ua ke tuav cov rwb thaiv tsev tiv thaiv ntawm lub fastening system raws li EN 13146-5 kev xeem. Txoj cai xaiv yog txhawm rau txheeb xyuas qhov chaw ib puag ncig, qhov yuav tsum tau siv tshuab thiab cov cuab yeej hauv chav ua ntej, thiab cia cov txheej txheem ua raws.

Cov lus nug nquag

Q1: Vim li cas qhov kev kho saum npoo hu ua kev ua haujlwm zoo dua li cov tshuaj pleev ib ce ntawm cov hlua khi?

Vim hais tias corrosion tshem tawm cov load-cov kabmob seem, kev sib txhuam tswj kev txiav txim siab seb lub zog torque puas muab lub zog clamping tshwj xeeb, thiab txheej txheem txheej tuaj yeem qhia hydrogen rau hauv cov hlau tawv. Tag nrho peb qhov cuam tshuam rau kev nyab xeeb ntawm kev khiav, tsis yog qhov tsos.

Q2: Puas yog zinc txheej ua rau kom rub - tawm lub zog ntawm cov ntsia hlau ntsia hlau?

Tsis yog. Pull- tawm lub zog los ntawm cov ntawv xov, kev sib koom tes ntev thiab lub zog ntawm cov ntoo lossis dowel. Cov txheej tiv thaiv cov xov thiab tswj kev sib txhuam kom nruj, thiab nws cov thickness ntawm cov xov yog txwv kom khaws cia haum.

Q3: Qhov txheej txheem twg yog qhov zoo tshaj plaws rau chav kawm 10.9 taug kev ntsia liaj qhov rooj?

zinc flake txheej rau ISO 10683 lossis kub -dip galvanizing. Ob leeg zam qhov kev pheej hmoo ntawm hydrogen embrittlement ntawm electroplating ntawm hardened steel, uas tuaj yeem ua rau ncua kev puas tsuaj tom qab kev teeb tsa.

Q4: Dab tsi yog qhov tuab ntawm kub -dip galvanizing ntawm fasteners?

40 mus rau 85 um nyob ntawm xov loj thiab ib puag ncig, tswj los ntawm xov kam rau ua. ISO 10684 thiab ISO 1461 txhais cov chav kawm thiab cov txheej txheem pov thawj.

Q5: Vim li cas lub caij nplooj ntoos hlav clips rau siab - cov kab ceev feem ntau zinc diffusion coated?

Cov txheej txheem muab ib qho nyuaj, zoo ib yam zinc- txheej hlau uas tiv thaiv lub caij nplooj ntoos hlav yam tsis muaj kev cuam tshuam rau nws txoj kev npau taws thiab tsis muaj hydrogen, thiab nws tiv taus ballast abrasion zoo dua li nyias electroplating.

Q6: Thaum twg stainless hlau fasteners yuav tsum tau teev?

Nyob rau hauv qhov chaw ntub dej tas li los yog tshuaj lom neeg nruj heev uas cov txheej txheem kho tsis zoo, xws li cov qhov, cov txheej txheem ntug dej hiav txwv thiab cov nroj tsuag muaj kev lag luam. Stainless fasteners rau ISO 3506 tshem tawm corrosion raws li hom tsis ua haujlwm ntawm cov khoom siv ntau dua.