Cov txheej txheem ntau lawm yog pom nyob rau hauv daim duab 1. Feem ntau siv ob-yob ntoo khaub lig-dov piercing txheej txheem yog pom nyob rau hauv daim duab 2. Lub round tube billet yog dov mus rau hauv lub hollow tuab-walled raj (capillary raj), thiab lub axis ntawm ob. rolls tsim ib lub kaum sab xis nrog txoj kab dov. Nyob rau hauv xyoo tas los no, lub kaum sab xis inclination tau nce los ntawm 6 ° ~ 12 ° mus rau 13 ° ~ 17 °, uas ua kom lub perforation ceev. Kev tsim cov yeeb nkab steel nrog txoj kab uas hla ntawm ntau tshaj 250mm, siv cov perforation theem nrab kom txo cov phab ntsa thickness ntawm capillary. Cov thev naus laus zis tshiab xws li perforation nrog active rotating phau ntawv qhia phaj, rear thrust perforation, axial tawm thiab cyclic sab saum toj vuam kuj ua rau tej yam kev txhim kho, yog li ntxiv dag zog rau cov txheej txheem perforation thiab txhim kho cov capillary zoo. Tsis siv neeg raj dov zeb Rolls tuab-walled capillary raj rau hauv nyias-walled khib nyiab raj. Feem ntau tom qab 2 mus rau 3 hla, lub thickness ntawm cov khoom tiav yog dov mus rau phab ntsa thickness, thiab tag nrho elongation yog li ntawm 1.8 mus rau 2.2. Txij li thaum xyoo 1970s, ib lub qhov rolls, ob chav sawv ntsug tandem mills, ob qhov kev taug qab dov thiab lub taub hau kheej kheej tau siv. Technology tau txhim kho kev ua haujlwm ntau lawm thiab pom tau tias lub raj dov mechanization. Cov qauv ntawm lub tshuab leveling zoo ib yam li lub tshuab xuas nrig ntaus. Lub hom phiaj ntawm kev ua kom zoo yog txhawm rau tshem tawm cov teeb meem sab hauv thiab sab nraud thiab cov ellipticity ntawm cov yeeb nkab khib nyiab, thiab txo qhov tsis sib xws ntawm cov phab ntsa sab nraud. Nyob rau hauv xyoo tas los no, kev siv lub tshuab peb-yob leveling tau txhim kho qhov deformation thiab leveling efficiency ntawm lub tshuab leveling. Lub tshuab sizing yog tsim los ntawm 3-12 racks, thiab lub tshuab txo yog tsim los ntawm 12-24 racks, thiab tus nqi txo yog li 3-28%. Lub tshuab txo qhov nro uas tau tshwm sim hauv xyoo 1950 tau tswj cov phab ntsa tuab nrog qhov tsim nyog nruj thaum kho cov yob ceev thiab txo txoj kab uas hla. Hom tshiab ntawm kev nro txo lub tshuab feem ntau yog siv peb-txheej hom, nrog 18-28 racks, nrog kev txo qis tshaj plaws ntawm 80%, phab ntsa txo tus nqi ntawm 44%, thiab qhov hluav taws xob ceev ntawm 18mm ib ob.
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