Chophimba chamafuta ndi cholumikizira chachifupi, chomwe chimayambitsa izi chifukwa cha kulephera kwa makina amkati monga chodzigudubuza kapena shaft eccentricity, kapena mphamvu yowotcherera kwambiri, kapena zifukwa zina. Pamene liwiro kuwotcherera ukuwonjezeka, chubu akusowekapo extrusion liwiro ukuwonjezeka. Izi facilitates extrusion wa zigawo madzi zitsulo ndi oxides kuti akhala usavutike mtima kusungunula kwa mkulu khalidwe kuwotcherera. Panthawi imodzimodziyo, kuwonjezereka kwa liwiro la kuwotcherera kungathenso kuchepetsa nthawi yotentha ya groove pamwamba, kotero kuti dera lalifupi la mafuta likhoza kufupikitsidwa ndipo malo omwe akhudzidwa ndi kutentha akhoza kuchepetsedwa.

M'malo mwake, osati kutentha komwe kumakhudzidwa kumakhala kwakukulu, komanso gawo lopyapyala lazitsulo zazikulu zamadzimadzi zomwe zimapangidwira pamtunda zimakhala wandiweyani, ndipo ma burrs akuluakulu amapangidwa, omwe amawononga mtundu wa weld. Komabe, pa mphamvu inayake linanena bungwe, ozizira kuwotcherera liwiro sangathe ziwonjezeke popanda malire. Apo ayi, kutentha kwa mbali zonse za billet groove sikungafike kutentha kwa kutentha, kotero kuti pali cholakwika kapena palibe kuwotcherera konse.

Kwa chitsulo chosapanga dzimbiri, kagawo kakang'ono kophatikizana kophatikizana kwamafuta kumakhudza mapangidwe a welds. Kusefa kwamphamvu kumachepetsa ripple kukhala yochepera 1%. Mukawotcherera chitsulo chosapanga dzimbiri, ma frequency nthawi zambiri amakhala ma weld 200 okhala ndi kulimba bwino komanso malo okhudzidwa ndi kutentha kwakukulu. . Kawirikawiri, makoma amkati ndi akunja a chitoliro chowotcherera amapopera kuchokera kumalo otsekemera. Ma thovu apakati, osalekeza ndi abwino kutanthauza kuti mphamvu yowotcherera ndiyokwanira komanso makina ake ndi osafanana komanso mikhalidwe yowotcherera ya thovu ndi yosagwirizana komanso mtundu wa weld ndi woyipa.