Nau'i na asali da manyan sigogi na allura gyare-gyaren sukurori: Gabaɗaya, dunƙule ya kasu kashi uku: sashin ciyarwa, sashin matsawa, da sashin homogenization. Sashen ciyarwa - tare da ƙananan ƙananan diamita, babban aikinsa shi ne jigilar albarkatun kasa zuwa sassan da ke gaba; don haka babban abin damuwa shine isar da iya aiki. Siga: (L1, h1), h{4}} (0.12 - 0.14)D. Sashin matsawa - tare da canza diamita na tushe, babban aikinsa shine ƙaddamarwa da narke kayan aiki, kafa matsa lamba. Siga: matsi rabo ε=h1/h3 da L2. Ya kamata a bayyana daidaito ta amfani da gradient A=(h{13}} h3)/L2. Sashin homogenization (sashe na mita) - yana fitar da kayan da aka narke daga sashin matsawa zuwa gaba da dunƙule a ƙayyadaddun adadi da zazzabi. Siga: (L3, h3), h{19}} (0.05 - 0.07)D.
Ga dukkan dunƙule, siga na L/D (tsawon{0}}zuwa{1} diamita rabo) yana da fa'idodi da rashin lahani da yawa: L/D, tare da saurin juyi n, muhimmin abu ne a cikin ƙarfin robobi na dunƙule. L/D mafi girma yana haifar da tsawon lokacin zama na abu a cikin ganga, wanda ke da amfani don yin filastik. Hakanan yana rage matsi da kwararar ruwa, yana ƙara haɓaka ƙarfin filastik. Wannan kuma yana da fa'ida ga kayan da ke da buƙatun rarraba zafin jiki. Koyaya, L/D mafi girma na iya yin mummunan tasiri ga masana'anta, taro, da amfani. Gabaɗaya, L/D yana tsakanin 18 zuwa 20, amma akwai yanayin halin yanzu don haɓaka shi. Sauran sigogi sun haɗa da screw pitch S da kusurwar helix φ=πDtgφ. Gabaɗaya, D=S, don haka φ=17 digiri 40′. φ yana rinjayar ƙarfin filastik; gabaɗaya, babban φ yana haifar da saurin isarwa. Saboda haka, φ ya bambanta dangane da siffar kayan. Don foda, φ na iya zama a kusa da digiri 25; don kayan cylindrical, a kusa da digiri 17; kuma ga kayan toshewa, a kusa da digiri 15. Koyaya, ƙimar φ daban-daban suna sa aiki ya fi wahala, don haka φ galibi ana ɗaukarsa azaman 17 digiri 40′. Don kayan da ke da ƙananan danko, nisa e ya kamata ya zama babba kamar yadda zai yiwu. Ƙananan e zai iya haifar da ɗigo cikin sauƙi, amma girman e zai ƙara yawan amfani da wutar lantarki kuma ya haifar da zafi. e=(0.08~0.12)D. A taƙaice, a ƙarƙashin yanayi na yanzu, saboda rashin hanyoyin gwaji masu dacewa, babu cikakkiyar hanyar ƙira don ƙirar dunƙule.
