Taw qhia
Cov txheej txheem tsim cov hlau muaj ob txoj hauv kev tseem ceeb: kub dov thiab txias dov. Txhua txoj kev muaj nws qhov zoo thiab qhov tsis zoo, ua rau lawv siv rau hauv kev siv sib txawv. Ib qho ntawm cov lus nug ntau tshaj plaws uas tib neeg muaj yog seb cov hlau dov txias yog qhov nyuaj dua li cov hlau kub kub. Hauv tsab xov xwm no, peb yuav tshuaj xyuas qhov sib txawv ntawm ob txoj hauv kev thiab seb lawv cuam tshuam li cas ntawm cov hlau.
Kub Rolling yog dab tsi?
Kub dov yog txheej txheem ntawm dov hlau ntawm qhov kub thiab txias (feem ntau siab dua 1700 degree F) uas softens cov hlau thiab ua rau nws yooj yim rau kev tsim ntau yam duab. Cov txheej txheem kub dov yuav dhau los ntawm cov hlau los ntawm cov txheej txheem ntawm cov chais kom txo nws cov tuab thiab ua kom nws ua rau hauv daim ntawv xav tau lossis loj. Rolling mills feem ntau yog siv cov ingots loj los yog cov slabs uas tau rhuab mus rau qhov kub thiab txias thiab dov ntawm cov chais kom txog thaum lawv ncav cuag qhov xav tau tuab.
Cold Rolling yog dab tsi?
Txias dov, ntawm qhov tod tes, yog txheej txheem ntawm dov hlau ntawm chav tsev kub lossis me ntsis saum toj no. Cov txheej txheem no ua rau cov hlau hnyav dua thiab muaj zog dua, tab sis kuj yog nkig. Cov txheej txheem txias dov yuav dhau los ntawm cov hlau los ntawm cov chais uas compress nws nruab nrab ntawm lawv kom txo nws cov tuab. Tom qab ntawd cov hlau yog annealed kom tshem tawm cov kev ntxhov siab los ntawm cov txheej txheem dov.
Qhov cuam tshuam ntawm Temperature ntawm Hardness
Ib qho ntawm qhov sib txawv tseem ceeb ntawm kev kub dov thiab txias dov yog qhov cuam tshuam ntawm qhov kub thiab txias ntawm cov hlau. Kub dov hlau yog softer vim hais tias nws yog rhuab mus rau high kub, ua rau cov hlau ua ntau malleable. Yog li ntawd, nws yooj yim dua rau cov duab tab sis kuj tsis tshua muaj zog thiab ruaj khov. Cold rolled steel, ntawm qhov tod tes, yog ib qho nyuaj thiab muaj zog dua vim nws yog dov nyob rau hauv chav tsev kub los yog me ntsis saum toj no, uas ua rau cov hlau ua nkig.
Cov nyhuv ntawm Grain Structure ntawm Hardness
Lwm yam uas cuam tshuam rau lub hardness ntawm steel yog lub grain qauv. Kub dov hlau muaj cov qauv loj dua li cov hlau txias txias vim tias cov hlau tau rhuab mus rau qhov kub siab thaum lub sij hawm dov. Qhov no ua rau muaj ntau qhov sib txawv ntawm cov nplej uas tsis sib xws thiab muaj kev cuam tshuam ntau dua rau kev tawg lossis tsis ua haujlwm hauv kev ntxhov siab. Cold rolled steel, ntawm qhov tod tes, muaj cov qauv me me thiab ntau dua qub vim tias nws yog dov ntawm qhov kub thiab txias. Qhov no ua rau nws muaj zog thiab tsis tshua muaj kev ua tsis tiav.
Tus Nqi Kub Rolling vs. Cold Rolling
Tus nqi kub dov vs. txias dov yog lwm qhov tseem ceeb uas yuav tsum tau xav txog thaum xaiv ntawm ob txoj kev. Kub dov feem ntau kim dua vim nws xav tau ntau lub zog los ua kom sov cov hlau kom kub. Tsis tas li ntawd, kub dov hlau yuav tsum tau ua ntau dua kom ua tiav nws cov duab kawg thiab qhov loj me, uas tuaj yeem ntxiv rau tus nqi. Txias dov, ntawm qhov tod tes, tsis tshua kim vim nws ua tiav ntawm chav tsev kub thiab xav tau lub zog thiab kev ua haujlwm tsawg dua.
Kev siv ntawm Kub Rolled Steel
Kub dov hlau feem ntau yog siv rau hauv daim ntawv thov uas lub zog thiab durability tsis tseem ceeb raws li qhov yooj yim ntawm shaping thiab formability. Piv txwv li, kub dov hlau feem ntau yog siv rau hauv cov khoom siv, xws li I-beams, steel phaj, thiab cov kav dej. Nws kuj tseem siv rau hauv tsheb thiab cov khoom siv ua liaj ua teb, xws li cov cav cav thiab cov khoom siv tshuab.
Kev siv ntawm Cold Rolled Steel
Cov hlau txias txias yog siv rau hauv cov ntawv thov uas muaj zog thiab ua haujlwm ntev yog qhov tseem ceeb, xws li hauv kev tsim cov khoom siv tsheb thiab cov khoom siv. Nws kuj tseem siv rau hauv cov khoom siv xws li vov tsev thiab sab nrauv, thiab hauv kev siv xws li steel tubing thiab piping. Cold rolled steel feem ntau nyiam nyob rau hauv cov ntawv thov no vim nws lub zog, durability, thiab cov qauv zoo li qub.
Xaus
Hauv kev xaus, lub hardness ntawm steel yog cuam tshuam los ntawm ntau yam, nrog rau qhov kub thiab txias uas nws yog dov thiab cov qauv nplej. Kub dov steel yog softer thiab ntau malleable, ua rau nws yooj yim rau cov duab tab sis tsis tshua muaj zog thiab ruaj. Cold rolled steel, ntawm qhov tod tes, yog ib qho nyuaj thiab muaj zog dua, ua rau nws zoo tagnrho rau cov ntawv thov uas muaj zog thiab kav ntev yog qhov tseem ceeb. Kev xaiv ntawm kub dov thiab txias dov yog nyob ntawm qhov kev npaj siv cov hlau thiab cov khoom tshwj xeeb uas xav tau, nrog rau cov nqi thiab cov khoom siv.