Fishplate Material Strength thiab Joint Connection Reliability
Dab tsi yog cov qauv rau kev faib cov khoom siv zog ntawm lub teb chaws tus qauv fishplates?
National standard fishplates muab faib ua qib zoo tib yam thiab siab - qib zog raws li cov khoom siv zog. Cov qib zoo tib yam feem ntau siv 45 # siab - cov pa roj carbon zoo nrog lub zog tensile ntawm Ntau dua lossis sib npaug li 600MPa, uas yog tsim rau cov kev xav tau ntawm kev sib txuas yooj yim ntawm cov pa hluav taws xob ceev. High-lub zog fishplates txais Q345 qis- alloy steel, uas nws lub zog tensile tuaj yeem ncav cuag ntau dua 700MPa thiab lub zog tawm los tsis pub tsawg dua 345MPa, ua tau raws li qhov yuav tsum tau ua ntawm hnyav - tsheb ciav hlau railways. Cov txheej txheem cov ntaub ntawv tseem muaj cov kev cai meej ntawm elongation: qhov elongation ntawm qib zoo tib yam fishplates yog ntau dua los yog sib npaug rau 16%, thiab qhov siab ntawm - qib zog yog ntau dua los yog sib npaug rau 18%, xyuas kom meej tias qhov sib koom ua ke muaj peev xwm deformation yas txaus. Nyob rau tib lub sijhawm, tus qauv xav kom qhov cuam tshuam qhov tawv nqaij ntawm cov ntses yog ntau dua lossis sib npaug ntawm 27J ntawm chav tsev kub, thiab qhov cuam tshuam ntawm cov qauv tshwj xeeb rau thaj tsam alpine tseem yuav tsum muaj ntau dua lossis sib npaug ntawm 20J ntawm -40℃qis kom tiv thaiv qhov kev pheej hmoo ntawm qhov kub thiab txias ntawm qhov tawg. Tsis tas li ntawd, lub hardness ntawm cov khoom yuav tsum tau tswj nyob rau hauv ntau yam ntawm HB180-220 kom sib npaug zog thiab processability.
Dab tsi yog qhov zoo ntawm lub siab -lub zog alloy steel qauv ntawm txawv teb chaws tus qauv fishplates?
Txawv teb chaws tus qauv siab -lub zog alloy steel fishplates feem ntau ntxiv micro- alloy cov ntsiab lus xws li vanadium thiab titanium, uas tuaj yeem ua kom cov nplej zoo dua thiab txhim kho cov khoom zoo ntawm cov hlau. Nws lub zog tensile tuaj yeem ua tau ntau dua 20% siab dua li ntawm lub teb chaws tus qauv zoo tib yam. Qhov piv ntawm cov khoom siv zog rau lub zog tensile ntawm cov hlau alloy steel phaj nrog cov qauv no yog qhov tsim nyog, thiab nws tsis yooj yim rau kev ua kom cov yas deformation thaum muaj cov loads, ua kom lub sijhawm ntev - lub sij hawm nruj ntawm qhov sib koom ua ke. Cov mis mos alloy kuj tuaj yeem txhim kho qhov qaug zog ntawm cov hlau. Nyob rau hauv siab - zaus alternating loads, lub neej qaug zog tuaj yeem ncav cuag 1.5 npaug ntawm lub teb chaws tus qauv qauv, hloov mus rau qhov pib nquag- nres ua haujlwm ntawm kev tsheb ciav hlau hauv nroog. Tsis tas li ntawd, cov khoom siv hlau alloy muaj kev tiv thaiv corrosion zoo dua, thiab cov zaj duab xis passivation tsim los ntawm cov ntsiab lus hlau tuaj yeem txo cov xeb nyob rau hauv ib puag ncig sab nraum zoov thiab ntev kev pab cuam lub neej. Nyob rau tib lub sijhawm, nws muaj kev sib txuas zoo thiab tuaj yeem ua tiav kev txhim kho pob tw nrog ntau hom kev sib tw, ua kom haum rau cov kev xav tau ntawm kev hla kev hla - ciam teb railways.
Yuav ua li cas lub machining raug ntawm fishplate bolt qhov cuam tshuam kev sib txuas kev ntseeg tau?
Lub aperture kam rau ua ntawm fishplate bolt qhov yuav tsum tau tswj nyob rau hauv ± 0.1 hli. Yog hais tias lub aperture loj dhau lawm, qhov sib txawv ntawm lub ntsia liaj qhov rooj thiab lub qhov phab ntsa yuav dhau ntawm tus qauv, thiab qhov sib koom ua ke nws yooj yim rau xoob thaum lub tsheb ciav hlau hla, txo qhov kev sib txuas ruaj khov. Qhov nruab nrab ntawm qhov sib txawv ntawm qhov chaw yuav tsum tsawg dua lossis sib npaug li 0.2 hli. Kev sib txawv ntau dhau yuav ua rau muaj kev ntxhov siab tsis sib xws ntawm cov bolts, thiab qee qhov bolts yuav ris ntau dhau, uas yuav ua rau puas tsuaj. Lub perpendicularity yuam kev ntawm lub bolt qhov yuav tsum tsawg tshaj li los yog sib npaug rau 0.5 degree. Yog hais tias lub qhov chaw yog inclined, ntxiv dabtsi yog khoov lub sij hawm yuav tsum generated tom qab lub ntsia liaj qhov rooj yog ntsia, uas yuav ua rau kom lub cev qaug zog puas tsuaj ntawm ntsia liaj qhov rooj thiab fishplate nyob rau hauv ntev - lub sij hawm loads. Qhov roughness ntawm lub qhov phab ntsa yuav tsum tau tswj hauv qab Ra3.2μm. Cov roughness ntau dhau yuav tsim cov ntsiab lus kev ntxhov siab, thiab cov kab nrib pleb yooj yim pib los ntawm lub qhov phab ntsa, cuam tshuam rau tag nrho lub zog ntawm cov ntses phaj. Tsis tas li ntawd, siab - qhov precision ntsia liaj qhov rooj tuaj yeem ua kom haum ntawm lub phaj phaj thiab cov tsheb ciav hlau, txo lub log{14}} kev tsheb nqaj hlau cuam tshuam ntawm kev sib koom ua ke, thiab txhim kho kev tsav tsheb du.
Vim li cas ntses phaj rau hnyav - cov kab yuav tsum tau ntxiv dag zog rau kev tiv thaiv kev qaug zog?
Lub tsheb ciav hlau qag load hnyav - cov kab tsheb loj yog qhov loj, thiab qhov sib koom ua ke yuav dais dynamic loads ob peb zaug ntawm cov pa ceev kab. Yog tias qhov kev qaug zog ntawm lub phaj phaj tsis txaus, cov kab nrib pleb lossis txawm tias pob txha tuaj yeem tshwm sim, ua rau muaj kev hem thawj rau kev tsav tsheb. Txhim kho qhov kev qaug zog tiv thaiv kev tsim kho tuaj yeem txhim kho lub voj voog thauj khoom ntawm lub phaj phaj, ua kom nws tuaj yeem tiv taus tsis pub tsawg dua 3 lab alternating loads, deb tshaj li 1.5 lab lub sij hawm tus qauv ntawm cov pa ceev kab. Tus tsim los tiv thaiv- qaug zog yuav ua kom zoo dua cov qauv ntawm cov phaj ntses, xws li ua cov kev hloov pauv ntawm cov npoo nrog kev ntxhov siab, txo qhov kev ntxhov siab thiab ncua kev pib tawg. Nyob rau tib lub sijhawm, kev txhaj tshuaj peening yuav raug siv rau ntawm qhov chaw los tsim cov kev ntxhov siab seem ntawm cov ntses phaj, tshem tawm ib feem ntawm kev ntxhov siab tensile thiab txhim kho lub neej qaug zog. Tsis tas li ntawd, fishplates nrog rau kev tiv thaiv - kev qaug zog tsim tuaj yeem txo qhov kev tu ncua ntawm cov pob qij txha, txo kev ua haujlwm thiab kev saib xyuas tus nqi ntawm cov kab hnyav- cov kab, thiab xyuas kom muaj kev ua haujlwm tsis tu ncua thiab ruaj khov ntawm txoj kab.
Dab tsi yog qhov tshwj xeeb uas yuav tsum tau ua rau kev xaiv ntawm fishplates nyob rau hauv turnout seem?
Fishplates rau cov khoom xa tawm yuav tsum muaj siab - lub zog thiab qee yam elasticity, nrog lub zog tensile ntau dua lossis sib npaug li 750MPa thiab qhov elongation ntawm Ntau dua lossis sib npaug li 18%, yoog rau cov kev ntxhov siab nyuaj hauv cheeb tsam turnout. Qhov ntev ntawm lub turnout fishplate yuav tsum tau kho raws li qhov tshwj xeeb - zoo li seem ntawm lub turnout rail los xyuas kom meej qhov haum nrog lub tsheb ciav hlau lub taub hau thiab rail duav thiab tsis txhob muaj kev ntxhov siab concentration. Vim qhov chaw nqaim nqaim, lub phaj ntses yuav tsum tau txais kev tsim lub teeb yuag kom txo qhov ntim ntawm qhov chaw ua kom muaj zog, ua kom yooj yim rau kev tsim kho thiab kev teeb tsa. Qhov saum npoo ntawm lub phaj phaj yuav tsum tau hnav tshwj xeeb- tiv taus kho kom txo qis kev sib txhuam nrog qhov hloov pauv thiab txuas ntxiv mus rau qhov kev pabcuam. Tsis tas li ntawd, lub turnout fishplate yuav tsum muaj kev rwb thaiv tsev zoo, ua kom haum rau lub teeb liab hluav taws xob nyob rau hauv qhov chaw tig tawm thiab tiv thaiv cov teeb liab cuam tshuam.