Umbhobho owenza umcu yinkqubo yokuguqulwa kwe-curvature ye-curvature ye-longitudinal kunye nokusebenza okuqhubekayo kwicandelo elinqamlezayo, kwaye umcu ugotywe ngamandla enkqubo yokuguqulwa kwezinto ezininzi.

Umgaqo osisiseko wokwenza ithiyori yentsimbi yomthungo othe tye kukusebenza kwamandla angaphandle ukuvelisa uguqulo lweplastiki yomcu wentsimbi ibe yimilo enqwenelekayo kunye neetyhubhu zobungakanani.Ekubeni umbhobho wentsimbi kwinkqubo yokuguqulwa komgangatho oyintloko kwimiba eqhubekayo ethe tye kunye nethe nkqo, ukubophelela okufakwe kuyo kucwangciswe kwiinkalo ezimbini zokuphumeza kunye nokudlula kwi-mill roll forming, i-roll passes kukwenza i-deformation transverse yensimbi, intsimbi yokusila yentsimbi ilungiselelwe ukuvelisa i-longitudinal deformation, imodeli ethile yokusebenza kunye neentlobo ezahlukeneyo zobunjineli yinkqubo yokuguqulwa kwentsimbi eqhubekayo ukuze iphunyezwe ngezigaba, ukusuka kwi-mill ehambelanayo (kuquka i-groove roll kunye ne-mill arrangement) ukufezekisa. .I-deformation ye-longitudinal kwi-rolling direction ye-plate ithetha kwi-cylindrical shape deformation, i-tube cross-section transverse deformation ithetha i-bend deformation.

Inkqubo yokwenziwa kwemibhobho yahlulahlulwe ngokubanzi yazizigaba ezithathu: icandelo elikrwada leprofayili, inqanaba eliphakathi lotshintsho kunye nokugqiba ukwenza inqanaba, banento efanayo ngumgaqo othi “ellipse a circle”, okukhokelela kuguquko lwezizathu zokuchitha inkqubo yokupasa yahluke kakhulu, ubukhulu becala kwiimeko iindlela zeklasiki, kukho indlela yokugoba emphethweni, indlela yokugoba ejikelezayo, iziko kunye nendlela yokugoba kamva ephuma kwiradiyasi enye, iradiyasi ephindwe kabini, indlela yokubumba “w”.Ukwenziwa kwerowu kunye neentyantyambo ezigogekileyo ziyakwazi ukurhoxiswa, i-axis yayo enkulu ye-elliptical cross-section kwi-transverse direction.