LubCov txheej txheem molding ntawm SMC khoomyog qhov ua tau zoo tshaj plaws hauv cov txheej txheem molding yas / cov khoom siv sib xyaw ua los ntawm cov iav fiber. Cov txheej txheem molding SMC muaj ntau yam zoo, xws li: qhov loj me ntawm cov khoom raug, qhov chaw du, cov khoom zoo nkauj thiab qhov loj me rov ua dua, cov qauv nyuaj kuj tuaj yeem molding ib zaug, kev ua tiav theem ob tsis tas yuav ua rau cov khoom puas tsuaj, thiab lwm yam. Txawm li cas los xij, cov qhov tsis zoo kuj tseem yuav tshwm sim hauv cov txheej txheem molding SMC, uas feem ntau pom tseeb hauv cov laj thawj hauv qab no:
(Kuv)Tsis muaj khoom sivTsis muaj cov khoom siv txhais tau tias cov khoom SMC molded tsis tau puv tag, thiab cov chaw tsim khoom feem ntau tsom mus rau ntawm ntug ntawm cov khoom SMC, tshwj xeeb tshaj yog cov hauv paus hniav thiab sab saum toj ntawm cov ces kaum.
(a) Tso tawm cov khoom tsawg dua
(b) Cov khoom siv SMC muaj cov kua dej tsis zoo
(C) Lub zog ntawm cov khoom siv tsis txaus
(d) Kho sai dhau
Txoj kev tsim khoom thiab kev tiv thaiv:
①Tom qab cov khoom SMC raug ua kom yas los ntawm cua sov, qhov viscosity ntawm cov yaj yog loj. Ua ntej qhov kev sib txuas thiab kev sib xyaw ua ke tiav, tsis muaj sijhawm txaus, siab, thiab ntim kom puv cov pwm qhov nrog cov yaj.
②) Lub sijhawm khaws cia ntawm SMC molding khoom ntev dhau lawm, thiab styrene volatilizes ntau dhau, ua rau muaj kev txo qis ntawm cov khoom ntws ntawm SMC molding khoom.
③Cov tshuaj nplaum resin tsis ntub rau hauv cov fiber. Cov tshuaj nplaum resin tsis tuaj yeem tsav cov fiber kom ntws thaum lub sijhawm molding, ua rau cov khoom tsis txaus. Rau qhov tsis txaus ntawm cov khoom siv los ntawm cov laj thawj saum toj no, qhov kev daws teeb meem ncaj qha tshaj plaws yog tshem tawm cov khoom siv pwm no thaum txiav cov khoom.
④Kev pub zaub mov tsis txaus ua rau tsis muaj khoom txaus. Kev daws teeb meem yog kom nce qhov pub zaub mov kom haum.
⑤Muaj cua ntau dhau thiab muaj ntau yam khoom tsis haum nyob rau hauv cov khoom siv pwm. Kev daws teeb meem yog kom nce tus naj npawb ntawm cov pa tawm; nce thaj chaw pub mis thiab ua kom lub cev qhuav rau ib lub sijhawm kom ntxuav pwm; nce lub siab pwm kom zoo.
⑥Lub siab lig dhau lawm, thiab cov khoom pwm tau ua tiav kev sib txuas thiab kho ua ntej sau lub pwm qhov. ⑦Yog tias qhov kub ntawm pwm siab dhau, qhov kev sib txuas thiab kev kho yuav nce mus, yog li qhov kub yuav tsum tau txo qis kom tsim nyog.
(2)Lub qhov quav.Muaj cov qhov me me tsis tu ncua lossis tsis sib xws ntawm qhov chaw ntawm cov khoom, feem ntau yog tsim tawm ntawm sab saud thiab nruab nrab phab ntsa nyias ntawm cov khoom.
Txoj kev tsim khoom thiab kev tiv thaiv:
① Cov khoom siv SMC molding muaj ntau cov huab cua thiab cov ntsiab lus volatile loj, thiab cov pa tawm tsis du; qhov cuam tshuam ntawm cov khoom siv SMC thickening tsis zoo, thiab cov roj tsis tuaj yeem tsav tawm zoo. Cov laj thawj saum toj no tuaj yeem tswj tau zoo los ntawm kev sib xyaw ua ke ntawm kev nce tus naj npawb ntawm cov qhov cua thiab ntxuav cov pwm.
② Qhov chaw pub mis loj dhau, kev txo qhov chaw pub mis kom raug tuaj yeem tswj tau. Hauv cov txheej txheem ua haujlwm tiag tiag, tib neeg tej yam kuj tuaj yeem ua rau mob trachoma. Piv txwv li, yog tias qhov kev nias siab ntxov dhau, nws yuav nyuaj rau cov roj qhwv hauv cov tshuaj molding kom raug tso tawm, ua rau muaj qhov tsis zoo ntawm qhov chaw xws li cov qhov hws ntawm qhov chaw ntawm cov khoom.
(3)Kev puas tsuaj thiab deformationQhov laj thawj tseem ceeb yog qhov kho tsis sib xws ntawm cov tshuaj molding thiab qhov shrinkage ntawm cov khoom tom qab demolding.
Txoj kev tsim khoom thiab kev tiv thaiv:
Thaum lub sijhawm kho cov tshuaj resin, cov qauv tshuaj hloov pauv, ua rau lub ntim shrinkage. Qhov sib xws ntawm kev kho ua rau cov khoom zoo li warp mus rau thawj sab kho. Qhov thib ob, qhov coefficient thermal expansion ntawm cov khoom loj dua li ntawm cov pwm hlau. Thaum cov khoom txias, nws txoj kev shrinkage ib txoj kev loj dua li qhov cua sov shrinkage ib txoj kev ntawm cov pwm. Txog qhov kawg no, cov txheej txheem hauv qab no tau txais yuav los daws qhov teeb meem:
① Txo qhov sib txawv ntawm qhov kub ntawm cov pwm sab saud thiab sab qis, thiab ua kom qhov kub faib tawm zoo li qub tau;
②Siv cov khoom siv txias kom txo qhov deformation;
③ Ua kom lub siab molding nce ntxiv, ua kom cov qauv compactness ntawm cov khoom, thiab txo qhov shrinkage ntawm cov khoom;
④ Ntev lub sijhawm khaws cia cua sov kom raug kom tshem tawm kev ntxhov siab sab hauv.
⑤Kho qhov kev kho kom qhuav ntawm cov khoom SMC.
(4)Ua pob liab.Lub voj voog semicircular ntawm qhov chaw ntawm cov khoom kho.
Txoj kev tsim khoom thiab kev tiv thaiv:
Tej zaum cov khoom siv kho tsis tiav, qhov kub hauv zos siab dhau, lossis cov ntsiab lus volatile hauv cov khoom siv loj, thiab cov cua ntes ntawm cov ntawv, uas ua rau lub semicircular bulge ntawm qhov chaw ntawm cov khoom.
(①Thaum nce lub molding siab
(②Txuas lub sijhawm khaws cia cua sov
(③) Txo qhov kub ntawm pwm.
④Txo qhov chaw tsis txav mus los
(5)Cov xim ntawm cov khoom tsis sib xws
Txoj kev tsim khoom thiab kev tiv thaiv:
①Qhov kub ntawm pwm tsis sib xws, thiab qhov khoom siab dhau. Yuav tsum tswj qhov kub ntawm pwm kom zoo;
②Cov dej tsis zoo ntawm cov khoom siv molding, ua rau muaj kev faib tawm fiber tsis sib xws, feem ntau tuaj yeem ua rau lub siab molding nce ntxiv kom ua rau cov dej ntawm cov yaj nce ntxiv;
③Cov xim thiab cov tshuaj pleev xim tsis tuaj yeem sib xyaw zoo thaum lub sijhawm sib tov xim.
Lub sijhawm tshaj tawm: Tsib Hlis-04-2021
