Fishplate Bolt Standards thiab Performance Requirements
Cov txheej txheem tseem ceeb twg yog Asmeskas tus qauv ntses bolts ua raws li?
Asmeskas tus qauv ntses bolts feem ntau ua raws li cov qauv ntawm American Railway Engineering thiab Maintenance- ntawm -Txoj Kev Koom Tes (AREMA) thiab American Society for Testing and Materials (ASTM). Cov qauv no qhia meej meej qhov ntsuas qhov ntev, cov khoom siv, kev kho saum npoo thiab lwm yam kev xav tau ntawm cov bolts. Cov xov tshwj xeeb txais yuav cov xov sib koom ua ke (UN series), xws li xov coarse (UNC) lossis xov coarse ntxiv (8UN). Lub taub hau zoo, tuab, dav thoob plaws flats thiab lwm qhov ntev muaj qhov tshwj xeeb nruj kom ntseeg tau tias muaj kev sib raug zoo nrog cov cuab yeej teeb tsa. Cov qauv tseem qhia meej txog kev xaiv cov khoom siv raws li kev ua haujlwm sib txawv kom ntseeg tau tias muaj kev ntseeg siab ntawm cov bolts hauv kev siv tswv yim.
Dab tsi yog cov khoom siv ntawm cov ntses bolts thiab vim li cas cov ntaub ntawv no tuaj yeem ua tau raws li qhov yuav tsum tau ua?
Cov khoom siv feem ntau yog cov pa roj carbon steel lossis hlau alloy steel, xws li ASTM A307 Qib B, A193 Qib B7, thiab lwm yam. Tom qab quenching thiab tempering tshav kub kho, cov ntaub ntawv no muaj lub zog tensile ntawm ntau tshaj 600MPa, uas tuaj yeem tiv taus lub zog loj ntawm kev ua haujlwm tsheb ciav hlau. Lawv muaj lub zog ua haujlwm siab thiab ua rau qaug zog zoo heev, thiab tuaj yeem tiv nrog siab - zaus vibration loads. Stainless hlau cov ntaub ntawv yog siv nyob rau hauv tshwj xeeb kev ua hauj lwm tej yam kev mob los tiv thaiv tej yam kub thiab corrosive ib puag ncig. Cov tshuaj muaj pes tsawg leeg ntawm cov ntaub ntawv no yog ruaj khov, thiab kev ua tau zoo, uas tuaj yeem ua tau raws li qhov yuav tsum tau muaj ntawm cov xov raug thiab qhov ntev ntawm cov qauv, kom ntseeg tau tias kev sib txuas ntawm lub zog.
Yuav ua li cas cov qauv tsim ntawm ntses bolts txhim kho kev sib txuas kev ntseeg tau?
Nws txais tag nrho -ntev xov tsim. Tsuas yog lub taub hau, lub bolt shank yuav luag tag nrho cov xov kom paub meej txaus meshing ntev nrog ntses daim hlau thiab txiv ntseej. Kev hloov pauv ntawm cov qauv tsim ntawm lub taub hau thiab lub shank txo qis kev ntxhov siab thiab tsis txhob tawg hauv qhov rov ua dua. Qee cov qauv tau nruab nrog cov txiv ntseej xauv lossis cov tshuab ntxhua khaub ncaws kom tsis txhob xoob los ntawm qhov siab - zaus vibration. Lub ntsia liaj qhov rooj ntev yog tsim raws li hom kev tsheb ciav hlau (lub teeb tsheb ciav hlau, tsheb ciav hlau hnyav), feem ntau ntawm 100mm thiab 300mm, txhawm rau txhawm rau txhawm rau txhawm rau txaus. Lub zuag qhia tag nrho cov qauv yog yoog mus rau lub mounting qhov ntawm cov ntses phaj, kom ntseeg tau tias uniform kis tau tus mob ntawm preload thiab txhim khu kev twb kev txuas stability ntawm lub sib koom tes.
Dab tsi yog txoj kev kho saum npoo ntawm ntses bolts thiab lawv txoj haujlwm?
Cov kev kho saum npoo uas muaj xws li kub-dip galvanizing, phosphating + painting, thiab kev kho dub oxide. Kub-dip galvanizing muaj ib txheej zinc txheej thiab muaj zog corrosion kuj, uas tuaj yeem hloov mus rau qhov chaw nyob sab nraum zoov. Phosphating + painting kev kho mob tuaj yeem txhim kho xeb tiv thaiv thiab txuas ntxiv lub neej kev pabcuam ntawm bolts hauv thaj chaw muaj plua plav. Kev kho oxide dub yog tsim rau qhov chaw qhuav thiab tuaj yeem txhim kho qhov tawv tawv thiab hnav tsis kam. Cov kev kho mob no tuaj yeem tiv taus qhov yaig ntawm cov dej vapor thiab plua plav hauv qhov chaw khiav thiab txo cov ntsia hlau corrosion. Kev kho deg kuj tuaj yeem txhim kho qhov kev txhim kho smoothness ntawm bolts thiab tsis txhob xov jamming.
Dab tsi tshwj xeeb kev ua tau zoo yuav tsum tau ntses bolts rau hnyav -cov kab sib ntsib?
Ntses bolts rau hnyav- cov kab tsheb yuav tsum muaj zog tensile ntau dua thiab muaj zog tawm los tiv thaiv cov tsheb ciav hlau loj dua. Qhov yuav tsum tau ua kom qaug zog yog nruj dua, uas yuav tsum tau kuaj xyuas los ntawm kev ua haujlwm qaug zog kom ntseeg tau tias tsis muaj kev ua tsis tiav nyob rau hauv ntev - lub sij hawm siab - zaus vibration. Cov xov raug yuav tsum tau siab dua kom ntseeg tau tias nruj meshing nrog ceev thiab tsis txhob loosening. Kev kho saum npoo yuav tsum tau siv ntau dua corrosion-txoj kev tiv thaiv, xws li thickened kub-dip galvanizing txheej. Nws kuj yuav tsum muaj qhov zoo toughness kom tsis txhob nkig tawg nyob rau hauv hnyav load cuam tshuam thiab ua kom muaj kev ruaj ntseg ntawm txoj kab.