1. Rolling pwm: Txoj kev dav dav ntawm dov pwm yog nias lub khob hmoov rau hauv iav lev. Ua ntej ncaj seam steel yeeb nkab yog dov, lub iav lev yog clamped ntawm cov hlau thiab qhov nruab nrab ntawm cov pwm dov, ua kom cov iav ncoo nyob hauv nruab nrab. Raws li qhov tshwm sim ntawm kev tsis sib haum xeeb, cov nyhuv softening yog ua si rau qhov zoo, thiab cov duab ntawm cov iav mats sib phim cov duab ntawm inlet cone ntawm dov pwm thiab qhov kawg ntawm cov hlau.

2. Rolling nruas thiab mandrel: Cov iav muaj pes tsawg leeg siv rau kev siv du ntawm lub nruas dov thiab mandrel yog hmoov, nrog cov khoom me me thiab siab softness, thiab tom qab ntawd nws yog coated rau hauv lub qhov thiab sab nrauv ntawm cov hlau. Tsis tas li ntawd, nws muaj peev xwm qhwv cov ntaub iav rau sab nrauv ntawm cov khoom siv hlau thiab cua cov iav ntaub sawb rau ntawm tus pas nrig.

3. Tshem tawm cov iav zaj duab xis nyob rau sab nrauv ntawm cov yeeb nkab steel: Txij li cov iav smoothing tus neeg sawv cev yog siv thaum dov, ib daim iav nyias nyias yuav khaws cia rau sab hauv thiab sab nraud ntawm cov yeeb nkab steel. Cov yeeb yaj kiab no zoo ib yam li iav zoo tib yam, tawv thiab tawv. Crisp, uas cuam tshuam rau cov khoom muag tom qab muab tso rau hauv kev siv, yog li nws yuav tsum tau muab tshem tawm. Muaj cov txheej txheem kho tshuab thiab tshuaj lom neeg rau kev tshem tawm. Cov txheej txheem siv tshuab tuaj yeem siv rau kev txhaj tshuaj peening, dej txias thiab ncab thiab ncaj. Yog tias peb siv cov txheej txheem tshuaj los tshem tawm cov iav zaj duab xis, peb txhua tus paub tias cov khoom siv tshuaj ntawm cov iav yog qhov ruaj khov. Yog li ntawd, yog tias peb siv cov txheej txheem tshuaj, peb siv cov kua qaub uas muaj zog lossis cov kua alkaline muaj zog. Txawm li cas los xij, kev puas tsuaj ntawm txoj kev pickling yog tias nws yog corrosive heev rau ntau yam steel yeeb nkab raw cov ntaub ntawv, uas yuav ua rau lub nto ntawm cov yeeb nkab steel yuav tsum tau pickled, tshwj xeeb tshaj yog rau carbon steel. Nws tsis yog tus nqi-zoo thiab tsis tsim nyog xaiv rau pickle ib leeg. Yog li niaj hnub no, txoj kev tshem tawm cov kua qaub thiab alkali feem ntau yog siv.