1. Qhov txawv ntawm "rail head hardness" thiab "rail core hardness," thiab vim li cas qhov nyiaj tshuav no tseem ceeb?
Rail taub hau hardness yog qhov nyuaj ntawm txoj kev tsheb ciav hlau sab saum toj (300-400HB rau Q&T rails), optimized rau hnav tsis kam. Rail core hardness yog qhov nyuaj ntawm txoj kev tsheb ciav hlau sab hauv (260-280HB), tsim los rau cov tawv nqaij (muaj peev xwm nqus tau yam tsis muaj kev tawg). Qhov nyiaj tshuav no tseem ceeb heev vim: 1.Ib lub taub hau tawv tsis muaj lub cev tawv: Lub taub hau tiv taus hnav tab sis cov tub ntxhais tawg hauv qab kev co (ntau nyob hauv siab - nrawm nrawm). 2.Lub cev tawv tsis muaj lub taub hau tawv: Lub tsheb ciav hlau absorbs cuam tshuam tab sis lub taub hau hnav sai sai (teeb meem rau hnyav-cov kab). Piv txwv li, AREMA 132RE muaj 340-400HB lub taub hau thiab 280HB core-zoo meej rau 35t axles, vim nws tiv taus hnav thiab tuav cuam tshuam. Qhov "tawv saum npoo, tawv core" tsim yog ib qho tseem ceeb ntawm kev tsheb ciav hlau niaj hnub.
2. Dab tsi yog "rail profile degradation," thiab nws tau saib xyuas li cas rau kev siab - nrawm zoo li CRTS 300N?
Rail profile degradation yog qhov hloov pauv hloov pauv ntawm lub taub hau ntawm txoj kab tsheb vim yog hnav, corrugation, lossis hollow coj-xws li, CRTS 300N rail's 75mm lub taub hau dav nqaim mus rau 74mm tom qab 10 MGT ntawm tsheb. Nws tau saib xyuas sivlaser profile scannersmounted ntawm kev soj ntsuam tsheb ciav hlau (piv txwv li, Tuam Tshoj lub tsheb ciav hlau CRH380A tshuaj xyuas), uas luam theej duab lub taub hau ntawm kev tsheb ciav hlau ntawm 100km / h thiab sib piv cov profile rau tus qauv tsim. Kev ntsuas ntsuas qhov sib txawv ntawm qhov dav, qhov siab, thiab curvature (txog ± 0.05mm). Rau CRTS 300N, yog tias degradation tshaj 1 hli (xws li, 0.8 hli hollow hnav), kev sib tsoo yog teem caij. Kev soj ntsuam txhua hli kom ntseeg tau tias txoj kev tsheb ciav hlau tswj hwm nws qhov profile meej, uas yog qhov tseem ceeb rau kev ua haujlwm zoo, nyab xeeb siab - nrawm.
3. European UIC 54 rail lub tensile lub zog yog dab tsi, thiab nws puas txhawb nqa cov khoom thauj hauv cheeb tsam?
UIC 54 muaj lub zog tensile yam tsawg kawg nkaus ntawm 720MPa, txaus los txhawb lub regional freight tsheb thauj mus los nrog qag loads Tsawg tshaj los yog sib npaug zos rau 20t (xws li, European regional freight tsheb ciav hlau nqa khoom ua liaj ua teb). Thaum lub 20t qag hla, txoj kev tsheb ciav hlau muaj kev ntxhov siab ntawm ~ 550MPa-zoo hauv qab 720MPa, tawm hauv qhov kev nyab xeeb kom tsis txhob muaj qhov deformation mus tas li. UIC 54 lub zog tseem cia nws ua haujlwm dhau sijhawm (piv txwv li, 22t axles) yam tsis ua haujlwm. Cov kab tsheb thauj mus los hauv cheeb tsam feem ntau muaj cov tsheb khiav tsawg dua (10-15 tsheb ciav hlau / hnub), yog li UIC 54 lub zog sib npaug nrog tus nqi -kev ua tau zoo- hnyav dua UIC 60 yuav tsis tsim nyog. Qhov no ua rau UIC 54 qhov kev xaiv ua tau zoo rau kev xa khoom hauv cheeb tsam thoob plaws Tebchaws Europe.
4. Dab tsi yog "rail aluminothermic welding flux," thiab nws cuam tshuam li cas rau kev sib koom ua ke?
Rail aluminothermic welding flux yog sib xyaw ntawm txhuas hmoov, hlau oxide, thiab cov ntsiab lus alloying (manganese, silicon) uas tsav cov tshuaj tiv thaiv aluminothermic. Lub flux muaj pes tsawg leeg cuam tshuam rau kev sib koom ua ke lub zog: 1.High -purity flux: Tsawg hauv sulfur / phosphorus (<0.03%) produces a joint with tensile strength ≥700MPa (compatible with UIC 60), as impurities don't weaken the weld. 2. Alloyed flux: Ntxiv manganese (1.5–2%) kom phim cov tsheb ciav hlau cov hlau sib xyaw, kom ntseeg tau tias qhov sib koom ua ke muaj qhov zoo sib xws rau cov tsheb ciav hlau - tseem ceeb rau siab - nrawm nrawm. 3.Tsawg-flux zoo: High impurities ua rau brittle welds (tensile zog<650MPa), which crack under vibration. For CRTS 300N joints, only certified flux (e.g., German THERMET® flux) is used to ensure the joint can handle 350km/h speeds without failure.
5. Dab tsi yog American AREMA 115RE rail kev sib raug zoo nrog Pandrol clips, thiab vim li cas qhov no tseem ceeb?
AREMA 115RE tau ua tiav nrog Pandrol clips (xws li Pandrol e-Clip), ib qho kev sib txuas uas ruaj ntseg rau cov neeg pw tsaug zog. Lub tsheb ciav hlau lub hauv paus muaj tus qauv "lub xub pwg nyom" (ib lub voj me me) uas cov hlua khi, siv 8-10kN ntawm clamping quab yuam los tuav AREMA 115RE nyob rau hauv qhov chaw. Qhov kev sib raug zoo no tseem ceeb vim tias: 1.Fast installation: Pandrol clips tau teeb tsa hauv vib nas this nrog cov cuab yeej tshwj xeeb, ua kom ceev kev tsim kho rau North American mainlines . 2.Kev vibration tsis kam: Lub clip lub caij nplooj ntoos hlav quab yuam tuav lub zog clamping txawm nyob rau hauv kev sib xyaw ntawm kev vibration (tus neeg caij tsheb + thauj khoom), tiv thaiv AREMA 115RE los ntawm kev hloov pauv . 3.Kev saib xyuas tsawg: Pandrol clips tsis plam yooj yim, txo qhov xav tau kom rov ua kom zoo dua qub. Qhov kev sib raug zoo no ua rau AREMA 115RE + Pandrol clips nrov ua ke rau North American regional thiab mainline railways.