Kayendetsedwe ka Makhalidwe ndi Kagwiritsidwe Ntchito ka Ma Direct and Indirect Extrusion for Aluminium Alloys

Ngakhale pafupifupi zotayidwa zonse zotayidwa ndi extrudable mu chiphunzitso, kuwunika extrudability gawo linalake kumafuna kuganizira mozama zinthu monga miyeso, geometry, aloyi mtundu, kulolerana zofunika, scrap rate, extrusion chiŵerengero, ndi lilime chiŵerengero. Kuphatikiza apo, ndikofunikira kudziwa ngati njira yachindunji kapena yosalunjika ndiyo njira yabwino kwambiri yopangira.

Direct extrusion ndi njira yomwe imagwiritsidwa ntchito kwambiri, yomwe imadziwika ndi mawonekedwe ake osavuta komanso kusinthasintha kwamphamvu, ndikupangitsa kuti ikhale yoyenera pakupanga kwambiri. Munjira iyi, chitsulo chotenthetsera cha aluminiyamu chimakankhidwa ndi nkhosa yamphongo kudzera pakufa kosasunthika, ndipo zinthuzo zimayenda mbali imodzi ndi nkhosa yamphongo. Kukangana pakati pa billet ndi chidebe ndi chikhalidwe cha izi. Kukangana kumeneku kumayambitsa kutentha kwa kutentha ndi kuwonjezereka kwa mphamvu, zomwe zimapangitsa kusiyana kwa kutentha ndi kusinthika kwa ntchito pautali wa extrusion. Chifukwa chake, kusiyanasiyana kumeneku kumatha kukhudza kapangidwe kambewu, microstructure, komanso kukhazikika kwazinthu zomaliza. Komanso, popeza kupanikizika kumacheperachepera panthawi yonse ya extrusion, kukula kwa mbiri kumatha kukhala kosagwirizana.

Mosiyana ndi izi, kutulutsa kosalunjika kumaphatikizapo kufa kokwera pa nkhosa yamphongo yomwe imakankhira mbali ina ndi billet ya aluminiyamu yokhazikika, zomwe zimapangitsa kuti zinthuzo ziziyenda mobwerera mobwerera. Chifukwa billet imakhalabe yofanana ndi chidebecho, palibe kukangana kwa billet-to-container. Izi zimabweretsa mphamvu zopanga zokhazikika komanso kulowetsa mphamvu panthawi yonseyi. Kupindika kwa yunifolomu ndi kutentha komwe kumatheka kudzera muzinthu zotulutsa zotulutsa zakunja zowoneka bwino bwino, mawonekedwe ang'onoang'ono osasinthika, komanso makina owongolera. Njirayi ndiyothandiza makamaka pamapulogalamu omwe amafunikira kusasinthika kwakukulu komanso kusinthasintha, monga makina opangira makina omata.

Ngakhale ubwino wake zitsulo, osalunjika extrusion ali ndi malire. Kuipitsidwa kulikonse pamwamba pa billet kungakhudze mwachindunji mapeto a pamwamba pa extrudate, zomwe zimapangitsa kuti pakhale kofunikira kuchotsa ngati-cast pamwamba ndi kusunga billet yoyera. Kuonjezera apo, chifukwa imfa iyenera kuthandizidwa ndikulola kuti extrudate idutse, kutalika kwake kovomerezeka kumachepetsedwa, kuchepetsa kukula kwa mawonekedwe owonjezera.

Chifukwa cha kayendetsedwe kake kokhazikika, kapangidwe ka yunifolomu, komanso kusinthasintha kwapamwamba, kutulutsa kosalunjika kwakhala njira yovuta kwambiri yopangira ndodo za aluminiyamu zogwira ntchito kwambiri ndi mipiringidzo. Pochepetsa kusiyanasiyana kwazinthu panthawi ya extrusion, kumathandizira kwambiri machinability ndi kudalirika kwakugwiritsa ntchito kwa zinthu zomalizidwa.