Lub shrinkage teeb meem ntawmyas seem(nto shrinkage thiab sab hauv shrinkage kab noj hniav) yog tshwm sim los ntawm lub cev yaj tsis txaus kua nplaum ntxiv thaum cov tuab ua tau txias. Peb feem ntau ntsib tsis muaj teeb meem yuav ua li cas txhawm rau txhawm rau txhawm rau, nce dej nkag, ncua sijhawm txhaj tshuaj, teeb meem ntsws tsis tuaj yeem daws.
Ntawm cov khoom siv feem ntau siv, lub shrinkage kab noj hniav ntawm cov khoom siv PC yog qhov nyuaj tshaj plaws los daws vim yog lub nrawm nrawm nrawm nrawm, thiab cov teeb meem me me thiab cov teeb meem shrinkage ntawm PP cov khoom kuj tseem nyuaj dua los daws.
Yog li ntawd, thaum ntsib qhov teeb meem loj ntsws ntawm tuab thiab qhov loj, nws yog qhov tsim nyog yuav tau coj qee cov txheej txheem tsis siv tshuaj txhaj tshuaj, txwv tsis pub nws nyuaj los daws cov teeb meem. Hauv kev tsim ntau lawm, peb tau pom cov txheej txheej kev paub zoo tshaj los daws qhov teeb meem nyuaj ntawm kev txhaj tshuaj molding.
Ua ntej tshaj plaws, nyob rau hauv qhov ua kom ntseeg tau tias qhov kev txhaj tshuaj tsis muaj qhov tsis txawv txav, txoj hauv kev ntawm lub sijhawm ua kom txias txias yog coj los ua qhov txhaj tshuaj molding tawm ntawm cov pwm ua ntej ntawm qhov kub. Nyob rau lub sijhawm no, qhov kub ntawm cov txheej sab nraud ntawm qhov txhaj tshuaj molding yog qhov tseem heev, thiab daim npog tsis yooj yim dhau, yog li qhov kub sib txawv ntawm sab hauv thiab sab nraud tsis loj heev, uas yog qhov zoo rau tag nrho cov ntsws, yog li txo qis concentrated shrinkage sab hauv txhaj tshuaj molding ib feem. Vim tias tag nrho shrinkage ntawm kev txhaj tshuaj molded qhov yog tas mus li, qhov ntau qhov zuag qhia tag nrho, qhov tsawg dua qhov yuav nkag siab zuj zus, yog li txo sab hauv shrinkage thiab sab ntsej muag ntsws.
Tom qab ntawd, yog tias yuav kom daws tau cov teeb meem ntawm lub ntsws me me ntawm cov kab noj hniav, nws yuav tau tham txog hauv qab no. Raws li rau qhov teeb meem ntawm kev txhim kho lub ntsej muag shrinkage, txoj kev daws teeb meem shrinkage kab noj hniav tom qab txhaj tshuaj molding ntawm qhov kub yog qhov txawv ntawm kev daws teeb meem shrinkage kab noj hniav.
Qhov teeb meem ntawm lub ntsej muag ntsws yog qhov los ntawm qhov kub siab tuaj pwm ntawm qhov pwm thiab qhov txias ntawm lub peev xwm txias. Qhov saum npoo ntawm cov haujlwm tshiab txhaj tshuaj moulding yog tseem mos (tsis zoo li lub ntsej muag tawv ntawm PC seem, uas yog cov yooj yim los tsim shrinkage kab noj hniav). Sab hauv lub ntsej muag ntsws uas tsis tau tshem tawm tag nrho yog vim qhov teeb meem ntawm lub tshuab nqus tsev, Vim li ntawd, cov nplaim txhaj moulded qhov chaw tau nrawm sab hauv sab hauv qhov nruab nrab ntawm qhov nruab nrab siab, thiab tib lub sijhawm, lub teeb meem shrinkage kab noj hniav tshwm sim. Cov. Ntxiv mus, qeeb qeeb ntawm qhov ua kom lub ntsej muag nrawm nrawm dua, ntau dua yuav tsim cov shrinkage kab noj hniav, xws li PP khoom, ntawm qhov tsis tooj, qhov ntau dua yuav tsim shrinkage kab noj hniav.
Yog li, tom qab txhaj cov khoom raug muab tso tawm ntawm cov pwm ua ntej ua ntej, nws yog qhov yuav tsum tau txias kom lawv, thiaj li cov nplaim ntawm qhov chaw txhaj tshuaj tuaj yeem tswj tau qee qhov tawv, kom nws tsis yooj yim los ua shrinkage kab noj hniav. Txawm li cas los xij, yog tias qhov teeb meem ntawm shrinkage yog teeb meem loj, kev txias txias yuav tsis tshem tawm. Nws yog ib qho tsim nyog yuav tau txais cov txheej txheem ntawm txoj kev tso dej khov kom ua rau qhov chaw ntawm cov txhaj tshuaj sai sai kom tsis txhob ntsws, tab sis sab hauv cov shrinkage kab noj hniav tseem yuav muaj. Rau cov khoom siv nrog cov mos mos uas zoo li PP, vim yog cov nyhuv ntawm lub tshuab nqus tsev thiab shrinkage quab yuam, qhov txhaj tshuaj moulded qhov chaw yuav poob zuj zus, tab sis cov neeg kawm ntawv ntawm shrinkage tau txo ntau heev.
Nyob rau tib lub sijhawm, yog tias lub sijhawm txhaj tshuaj txuas ntxiv kom hloov lub sijhawm txias, lub ntsej muag ntsws thiab txawm tias sab hauv shrinkage yuav raug kho kom zoo dua.
Txhawm rau daws qhov teeb meem ntawm shrinkage kab noj hniav, vim tias qis dhau pwm yuav ua rau qhov siab ntsws tsawg dua, nws yog qhov zoo dua kom txias cov pwm nrog tshuab dej, tsis txhob siv cov dej khov. Yog tias tsim nyog, cov pwm kub yuav tsum tau nce mus txog 100 ℃, piv txwv li, thaum txhaj cov khoom PC, qhov ua kom zoo dua ntawm shrinkage kab noj hniav yuav zoo dua. Tab sis yog tias yuav kom daws tau qhov teeb meem ntawm shrinkage, tuag kub tsis tuaj yeem nce ntxiv, tab sis xav tau kom txo.
Thaum kawg, qee zaum qee tus txheej txheem saum toj no tsis tuaj yeem daws qhov teeb meem kom meej, tab sis nws tau ua tau zoo heev. Yog tias nws yog qhov tsim nyog los daws qhov teeb meem ntawm lub ntsej muag ploj, nws tseem yog ib qho kev daws tsis tau ntxiv qhov ntxiv rau tus nqi tsim nyog ntawm tus neeg sawv cev tiv thaiv shrinking. Yog lawm, pob tshab yuav' t ua li no.
Yog tias tseem muaj cov qhab nia shrinkage nyob rau saum npoo ntawm phab ntsa tuab los yog qhov chaw yas xws li cov phab ntsa sab, cov lus qhia ntawm cov khoom siv roj pab txhaj tshuaj yuav daws teeb meem.
Cov roj pab tau txhaj tshuaj molding (GAIM) yog lub tshuab yas moulding tshiab, uas qhia cov pa roj siab rau hauv phab ntsa tuab ntawm qhov, ua rau hollow seem nyob rau hauv kev txhaj tshuaj molding ib feem, ua tiav cov txheej txheem txhawm rau, paub tseeb cov roj siab khaws thiab tshem tawm cov ntsws cim cim ntawm qhov khoom.
Cov txheej txheem kev txhaj tshuaj txhaj tshuaj tsis tuaj yeem ua ke nrog cov phab ntsa tuab thiab daim nyias nyias ua ke, thiab cov seem muaj cov kev nyuaj siab loj, yooj yim kev ua kom tawg, thiab qee zaum muaj cov shrinkage nyob rau saum npoo. Cov cuab yeej siv roj tshiab ua tiav tau zoo tsim cov phab ntsa tuab thiab eccentric phab ntsa khoom los ntawm hollowing tawm sab hauv ntawm phab ntsa tuab, thiab cov khoom lag luam muaj cov khoom zoo heev hauv av thiab tsis tshua muaj kev ntxhov siab. Lub teeb yuag thiab lub zog siab.
Tam sim no peb tau ua tiav cov roj tsim cov khoom tsim qauv thiab tsim cov pwm, suav nrog cov txheej txheem gating, huab cua inlet hom thiab cua faib qauv tsim tshuab, roj pab txhaj txheej txheem tsim thev naus laus zis, roj pabcuam kev txhaj tshuaj txheej txheem tsim thev naus laus zis, roj kev pab txhaj txheej txheem kev siv tshuab simulation, roj pab txhaj tshuaj cov khoom tsis xws luag thiab tshem tawm cov thev naus laus zis, roj pab cov txheej txheem tshwj xeeb cov khoom thev naus laus zis.
Cov khoom siv TV, khoom siv hauv tsev, tsheb, rooj tog, khoom siv niaj hnub, khoom siv hauv chaw ua haujlwm, khoom ua si thiab lwm yam tau qhib qhov chaw thov tshiab rau cov yas moulding. Cov roj siv tshuaj txhaj tshuaj thev naus laus zis tshuab yog qhov tshwj xeeb tshaj yog tsim rau cov yeeb nkab zoo li cov khoom, phab ntsa tuab, phab ntsa eccentric (qhov chaw muaj qhov sib txawv tuab thiab ntu-ntu) thiab cov tiaj tus qauv loj.
Roj pab ntaus ntawv: suav nrog cov nitrogen tsim thiab qhov system pressurization, chav tswj siab thiab txais cov khoom sib xyaw. Cov txheej txheem roj muaj peev xwm txuas tau tag nrho nrog cov txheej txheem kev txhaj tshuaj txhaj tshuaj molding tshuab (txhaj tshuaj molding tshuab).
Nws tuaj yeem txo qhov khoom hnyav (khoom siv txuag) los ntawm 40%, txo lub voj voog molding (txuag lub sijhawm mus txog 30%, tshem tawm cov cim ntsws thiab ua kom cov txiaj ntsig ntawm cov khoom tiav); txo qhov kev txhaj tshuaj txo los ntawm 60%, thiab siv cov tonnage txhaj tshuaj moulding tshuab los tsim cov qhov loj, txo cov haujlwm ua haujlwm; Ntev lub neej pwm, txo cov kev tsim khoom lag luam, thiab txais yuav ntau cov qauv ruaj khov xws li tuab cov hauv paus, kev txhawb nqa tuab, txuas phaj, thiab lwm yam, uas ua rau muaj kev ywj pheej ntawm cov pwm tsim.
