Aluminium profile extrusion ntau lawm, yuav tshwm nyob rau hauv lub taub hau txiav, tus Tsov tus tw ib nrab ntawm cov tiav ib feem ntawm alkali yaig tshuaj xyuas yuav tshwm sim feem ntau hu ua "shrinkage kab noj hniavqhov tsis xws luag hauvqab ntawm extruded aluminium alloy", uas muaj lub koom haum aluminium profile mechanical zog tsis tuaj yeem ua tau raws li qhov yuav tsum tau muaj, muaj kev nyab xeeb.
Nyob rau tib lub sijhawm, kev tsim cov aluminium alloy profiles rau saum npoo kho lossis tig ua, vim tias muaj qhov tsis xws luag los ua kom tsis muaj qhov txuas ntxiv ntawm cov khoom siv sab hauv, yuav cuam tshuam rau qhov chaw tom ntej thiab ua tiav, qhov hnyav yuav ua rau tsaus nti lossis kev puas tsuaj rau riam thiab lwm yam kev phom sij. 1) Hollowshrinkage kab noj hniavqhov tsis xws luaghauv qab: nyob rau hauv lub nyem hom, qhov nruab nrab ntawm qhov kawg ntawm lub bar los tsim ib tug hollow, cross-section nthuav tawm raws li ib tug ntug tsis du lub qhov los yog ntug uas muaj lwm yam impurities ntawm lub qhov, ntsug yog ib tug funnel-shaped (conical), funnel. ntxeev mus rau cov kev taw qhia ntawm cov outflow ntawm kub, feem ntau nyob rau hauv ib lub qhov-qhov dav hlau pwm extrusion, tshwj xeeb tshaj yog nyob rau hauv lub nyem coefficient yog me me, cov khoom txoj kab uas hla yog loj.
Tus Tsov tus tw ntawm ib phab ntsa tuab los yog ib qho profile uas yog nyem nrog oily extrusion gaskets yog pom ntau dua. 2) Lub nplhaib-puabshrinkage kab noj hniavqhov tsis xws luaghauv qab: nyob rau hauv lub nyem shunt pwm cov khoom ntawm ob qho kawg (tshwj xeeb tshaj yog lub taub hau) yog discontinuous nplhaib los yog arc puab, nyob rau hauv lub vuam kab ntawm ob sab ntawm lub crescent duab yog pom tseeb, lub nplhaib-puab.shrinkage kab noj hniavqhov tsis xws luaghauv qabntawm txhua qhov khoom symmetrical. Yog vim li cas rau kev tsim ntawm lubshrinkage kab noj hniavqhov tsis xws luaghauv qab: mechanical condition of theshrinkage kab noj hniavqhov tsis xws luaghauv qabtsim yog tias thaum lub sij hawm stratosmy dhau lawm, lub extrusion gasket maj mam mus rau hauv pwm, lub nyem nce thiab tsim ib tug dN cylinder ntawm nto siab nyob rau sab ntawm lub nyem lub tog raj kheej.