Kugwira ntchito kwa mandrels oletsedwa

Mandrel ndi chida chofunikira kwambiri popanga mapaipi opanda msoko. Amalowetsedwa mkati mwa thupi la chitoliro, akugwira ntchito limodzi ndi odzigudubuza kuti apange chiphaso cha annular, potero kuthandizira kupanga chitoliro. Mandrels amagwiritsidwa ntchito kwambiri m'njira monga mphero zosalekeza, kutalika kwa mipiringidzo, mphero zapaipi nthawi ndi nthawi, kuboola, kugudubuza kozizira komanso kujambula mapaipi.

Kwenikweni, mandrel ndi cylindrical bar yayitali, yofanana ndi pulagi yoboola, yomwe imatenga nawo gawo pakupindika kwa chitoliro mkati mwa zone yopindika. Makhalidwe ake oyendayenda amasiyana ndi njira zosiyanasiyana zogubuduza: panthawi yodutsa, mandrel amazungulira ndikuyenda axially mkati mwa chitoliro; m'njira zozungulira nthawi yayitali (monga kugudubuza kosalekeza, kugudubuza nthawi ndi nthawi, ndi kuboola), mandrel sazungulira koma amayenda mozungulira pamodzi ndi chitoliro.

M'mayunitsi opitilira mphero, mandrels amagwira ntchito m'magulu, gulu lililonse lili ndi mandrel osachepera asanu ndi limodzi. Njira zogwirira ntchito zitha kugawidwa m'magulu atatu: zoyandama, zopinga, ndi zoyandama pang'ono (zomwe zimatchedwanso semi-constrained). Nkhaniyi ikuyang'ana pa ntchito ya mandrels oletsedwa.

Pali njira ziwiri zogwiritsira ntchito mandrels oletsedwa:

1. Njira Yachikhalidwe: Kumapeto kwa kugudubuza, mandrel amasiya kuyenda. Chipolopolocho chikachotsedwa ku mandrel, mandrel amabwerera mwachangu, amatuluka pamzere wopindika, ndipo amazizidwa ndi kuthiridwa mafuta asanagwiritsidwenso ntchito. Njira imeneyi imagwiritsidwa ntchito ku Mannesmann Piercing Mills (MPM).
2. Njira Yowongoleredwa: Mofananamo, kumapeto kwa kugudubuza, mandrel amasiya kusuntha. Komabe, chipolopolocho chikachotsedwa ku mandrel ndi wovulayo, m'malo mobwerera, mandrel amapita patsogolo mwachangu, kutsatira chipolopolocho kudzera pa chovulacho. Pokhapokha podutsa pa chovulacho m'pamene mandrel amatuluka pamzere wopiringitsa kuti azizizira, kuthira mafuta, ndikugwiritsanso ntchito. Njirayi imachepetsa nthawi ya mandrel pa mzere, kufupikitsa mayendedwe akugudubuza ndikuwonjezera mayendedwe, kukwaniritsa liwiro la mipope 2.5 pamphindi.

Kusiyanitsa kwakukulu pakati pa njira ziwirizi kumakhala njira ya kayendedwe ka mandrel pambuyo pa chipolopolocho chichotsedwa: mu njira yoyamba, mandrel amasuntha mosiyana ndi chipolopolocho, akubwerera ku mphero yopukutira asanatuluke pamzere. Mu njira yachiwiri, mandrel amayenda mbali imodzi ndi chipolopolocho, kutuluka pa mphero, kudutsa pa chovulacho, ndiyeno kutuluka pamzere wogubuduza.

Ndikofunika kuzindikira kuti mu njira yachiwiri, popeza mandrel amafunika kudutsa chovula, mipukutu ya stripper iyenera kukhala ndi ntchito yotseguka yotseguka pamene ikugudubuza mipope yachitsulo yokhala ndi mipanda yopyapyala (kumene kuchepetsa chiwerengero cha stripper ndi osachepera. kawiri makulidwe a khoma la chipolopolo) kuteteza mandrel kuti asawononge mipukutu yovula.