Nyob rau hauv kev txhaj tshuaj molding tshuab, lub thoob thiab ntsia hlau yog lub hauv paus ntawm plasticizing thiab conveying. Lawv cov qauv tsim tau hloov pauv ntawm cov txheej txheem hloov pauv ntawm cov khoom siv yas los ntawm cov khoom mus rau lub xeev molten, koom ua ke kev paub los ntawm ntau yam kev qhuab qhia xws li thermodynamics, dej mechanics, thiab mechanical kis. Lub hom phiaj yog kom ua tiav cov txiaj ntsig zoo, zoo ib yam, thiab tswj tau cov nyhuv plasticizing kom tau raws li cov kev cai molding ntawm cov khoom sib txawv thiab cov khoom.
Lub thoob tsim ua ntej hais txog qhov tseeb kev tsim kho ntawm ib puag ncig thermal. Nws yog ib tug cylindrical qauv nrog ib tug loj ntev - mus rau - txoj kab uas hla piv (ntev mus rau puab txoj kab uas hla), ua ib tug kaw plasticizing kab noj hniav ntawm lub puab phab ntsa thiab cov ntsia hlau. Raws li cov kev taw qhia axial, nws tau muab faib ua qhov chaw tswj qhov kub thiab txias sib haum rau ntu pub mis, ntu compression, thiab seem homogenization. Txhua ntu yog nruab nrog cov cuab yeej cua sov ywj pheej thiab tuaj yeem ntxiv los ntawm lub tshuab ua kom txias, tsim cov gradient faib los ntawm qhov kub qis mus rau qhov kub siab thiab tom qab ntawd mus rau homogenization kub. Cov txheej txheem tswj qhov kub thiab txias no tuaj yeem tiv thaiv qhov muag muag ntawm cov khoom siv thaum ntxov, uas yuav ua rau cov khoom siv tsis zoo, thiab tuaj yeem muab cov cua sov txaus rau hauv cov compression thiab homogenization seem, txhawb nqa tag nrho melting ntawm cov khoom nyob rau hauv shear thiab tshav kub conduction. Nyob rau tib lub sijhawm, kev ua kom txias tiv thaiv qhov chaw overheating uas tuaj yeem ua rau cov khoom degradation. Cov txheej txheem rigidity tsim ntawm lub thoob lub cev kuj tseem ceeb heev, uas yuav tsum tau ua kom muaj kev kub siab thiab thermal stress. High-lub zog alloy steel forging los yog centrifugal casting feem ntau yog siv, thiab cov phab ntsa sab hauv tuaj yeem txhim kho nrog bimetallic composite lossis hnav- cov coatings resistant los txhim kho durability.
Lub hauv paus ntawm cov ntsia hlau tsim nyob rau hauv cov geometric tsis thiab kev ua haujlwm sib txuam ntawm cov xov thiab zawj. Raws li cov khoom siv txav ntawm cov ntsia hlau, nws muab faib ua ntu pub, ntu compression, thiab seem homogenization. Cov ntu pub mis muaj qhov sib sib zog nqus grooves thiab lub kaum sab xis helix, ua kom tau zoo thiab ua kom cov ntaub ntawv xoob xoob nrog qis shear quab yuam. Cov seem compression tau maj mam txo qis qhov ntim, siv lub suab lossis qhov sib sib zog nqus qhov sib txawv los ua kom cov khoom siv, tshem tawm cov cua, thiab ua kom qhov ntom ntom, thaum tib lub sijhawm txhim kho cov cua sov los txhawb kev yaj. Cov seem homogenization muaj ntiav thiab ntau cov grooves, stabilizing yaj siab thiab txaus tus nqi los xyuas kom meej uniform metering tso zis. Lub kaum sab xis helix cuam tshuam rau kev xa tawm kev ua haujlwm thiab shear lub zog, xav tau kev ua kom zoo raws li cov khoom siv viscosity thiab cov txheej txheem yuav tsum tau ua. Cov ntsia hlau nto zoo thiab kev kho deg kuj tseem nyob hauv qhov tsim; cov hniav tshwj xeeb los yog protrusions tuaj yeem txhim kho kev sib xyaw ua ke, thaum kho qhov tawv tawv kom txhim kho hnav tsis kam.
Lub haum tsim ntawm lub thoob thiab ntsia hlau ua raws li lub hauv paus ntsiab lus ntawm clearance tswj. Qhov tsim nyog clearance kom yaj sealing, tiv thaiv backflow, thiab txo cov kev khiav hauj lwm tsis kam thiab frictional tshav kub. Ib qho kev tshem tawm me me dhau los ua rau muaj kev siv hluav taws xob ntau ntxiv thiab kev pheej hmoo ntawm kev hnav, thaum loj dhau qhov kev tshem tawm txo cov plasticizing efficiency thiab ua rau to. Kev txhawb nqa thiab thrust qauv tsim ntawm tus tsav kawg yuav tsum xyuas kom meej lub coaxiality thiab axial stability ntawm cov ntsia hlau nyob rau hauv siab torque kom tsis txhob muaj qhov txawv txav tshwm sim los ntawm kev thauj khoom tsis sib xws.
Zuag qhia tag nrho, cov qauv tsim ntawm lub thoob thiab cov ntsia hlau yog ua raws li kev tswj hwm thermal, siv cov khoom siv conveying thiab shearing plasticizing li txhais tau tias. Los ntawm kev ua kom zoo dua ntawm cov qauv, tsis muaj, thiab cov khoom siv, nws ua tiav cov kev hloov pauv ntawm cov ntaub ntawv yas rau hauv cov txheej txheem yaj hauv cov txheej txheem tswj tau, muab qhov tseem ceeb lav rau qhov tseeb thiab zoo ntawm kev txhaj tshuaj molding.
