CovSMC khoom molding txheej txheemyog qhov ua tau zoo tshaj plaws hauv cov iav fiber reinforced yas / cov khoom siv molding txheej txheem.Cov txheej txheem SMC molding muaj ntau yam zoo, xws li: cov khoom lag luam yog qhov loj, du nto, cov khoom zoo thiab rov ua dua tshiab, cov qauv nyuaj kuj tuaj yeem ua pwm rau ib zaug, kev ua haujlwm theem nrab tsis tas yuav ua rau cov khoom puas, thiab lwm yam. Txawm li cas los xij, tsis zoo. Cov teeb meem tseem yuav tshwm sim hauv SMC molding txheej txheem, uas feem ntau tshwm sim hauv cov laj thawj hauv qab no:
(Kuv)Tsis muaj khoom: Tsis muaj cov khoom siv txhais tau hais tias SMC molded qhov chaw tsis ua tiav, thiab cov chaw tsim khoom feem ntau yog tsom rau ntawm cov npoo ntawm cov khoom SMC, tshwj xeeb tshaj yog cov hauv paus hniav thiab sab saum toj ntawm cov ces kaum.
(a) Tsawg cov khoom pov tseg
(b) SMC cov khoom muaj fluidity tsis zoo
(C) Cov khoom siv tsis txaus siab
(d) Kho ceev heev
Generation mechanism thiab countermeasures:
①Tom qab cov khoom SMC yog yas los ntawm tshav kub, yaj viscosity yog loj.Ua ntej qhov kev sib txuas ntawm kev sib txuas thiab kev sib zog ua kom tiav, tsis muaj sij hawm txaus, siab, thiab ntim los sau cov pwm kab noj hniav nrog cov yaj.
②) Lub sij hawm cia ntawm SMC molding cov khoom yog ntev dhau lawm, thiab cov styrene volatilizes ntau dhau, ua rau muaj qhov txo qis hauv cov khoom ntws ntawm SMC molding khoom.
③ Cov tshuaj txhuam hniav tsis yog tsau rau hauv fiber ntau.Cov tshuaj nplaum tsis tuaj yeem tsav cov fiber ntau ntws thaum lub sijhawm molding, ua rau cov khoom tsis txaus.Rau qhov tsis txaus ntawm cov ntaub ntawv los ntawm cov laj thawj saum toj no, qhov kev daws teeb meem ncaj qha tshaj plaws yog tshem tawm cov khoom molded no thaum txiav cov khoom.
④ Kev pub mis tsis txaus ua rau cov khoom tsis txaus.Txoj kev daws teeb meem yog txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhuam.
⑤ Muaj huab cua ntau dhau thiab muaj cov teeb meem tsis zoo hauv cov khoom molding.Txoj kev daws teeb meem yog kom tsim nyog nce tus naj npawb ntawm cov pa tawm;tsim nyog nce qhov chaw pub mis thiab burp rau qee lub sijhawm los ntxuav cov pwm;tsim nyog nce lub siab molding.
⑥ Lub siab lig dhau lawm, thiab cov khoom siv molded tau ua tiav kev sib txuas thiab kho ua ntej sau cov pwm kab noj hniav.⑦ Yog tias pwm kub siab dhau lawm, qhov sib txuas sib txuas thiab kho cov tshuaj tiv thaiv yuav ua ntej, yog li qhov kub thiab txias yuav tsum tau qis qis.
(2)Stoma.Muaj qhov tsis tu ncua lossis tsis xwm yeem me me ntawm qhov chaw ntawm cov khoom, feem ntau yog tsim nyob rau sab saum toj thiab nruab nrab nyias phab ntsa ntawm cov khoom.
Generation mechanism thiab countermeasures:
①SMC molding cov ntaub ntawv muaj cov huab cua ntau thiab cov ntsiab lus tsis hloov pauv loj, thiab cov pa tawm tsis zoo;Cov nyhuv thickening ntawm SMC cov khoom tsis zoo, thiab cov roj tsis tuaj yeem raug tsav tawm zoo.Cov laj thawj saum toj no tuaj yeem tswj tau zoo los ntawm kev sib xyaw ua ke ntawm kev ua kom cov vents thiab ntxuav cov pwm.
② Qhov chaw pub mis loj heev, tsim nyog txo qhov chaw pub mis tuaj yeem tswj tau.Hauv cov txheej txheem ua haujlwm tiag tiag, tib neeg yam tseem ceeb kuj tuaj yeem ua rau mob trachoma.Piv txwv li, yog hais tias lub pressurization yog ntxov dhau lawm, nws yuav nyuaj rau cov roj qhwv nyob rau hauv lub molding compound yuav tsum tau tso tawm, uas ua rau cov defects xws li pores nyob rau saum npoo ntawm cov khoom.
(3)Warpage thiab deformation.Qhov laj thawj tseem ceeb yog qhov tsis sib xws ntawm cov molding compound thiab shrinkage ntawm cov khoom tom qab demolding.
Generation mechanism thiab countermeasures:
Thaum lub sij hawm kho cov tshuaj tiv thaiv ntawm cov resin, cov qauv tshuaj hloov, ua rau lub ntim shrinkage.Lub uniformity ntawm curing ua rau cov khoom zoo li warp mus rau thawj kho sab.Qhov thib ob, lub thermal expansion coefficient ntawm cov khoom yog loj dua li ntawm cov hlau pwm.Thaum cov khoom yog txias, nws ib-txoj kev shrinkage tus nqi yog ntau tshaj ib-txoj kev tshav kub shrinkage tus nqi ntawm pwm.Txog qhov kawg no, cov txheej txheem hauv qab no raug coj los daws qhov teeb meem:
① Txo qhov kub thiab txias qhov sib txawv ntawm cov pwm sab saud thiab qis, thiab ua kom qhov kub thiab txias faib raws li qhov ua tau;
②Siv cov khoom cua txias kom tsis txhob deformation;
③ Tsim nyog ua kom lub siab molding, ua kom cov qauv compactness ntawm cov khoom, thiab txo qhov shrinkage tus nqi ntawm cov khoom;
④ Ntev lub sij hawm txuag hluav taws xob kom tsim nyog txhawm rau tshem tawm kev ntxhov siab sab hauv.
⑤ Kho qhov curing shrinkage tus nqi ntawm SMC cov khoom.
(4)Blistering.Lub semicircular bulge nyob rau saum npoo ntawm cov khoom kho.
Generation mechanism thiab countermeasures:
Tej zaum nws yuav yog tias cov khoom siv kho tsis tiav, qhov kub hauv zos yog siab dhau, lossis cov ntsiab lus tsis hloov pauv hauv cov khoom yog loj, thiab cov cua ntxiab ntawm cov nplooj ntawv, uas ua rau lub semicircular bulge ntawm cov khoom.
(①Thaum nce lub siab molding
(②Ntev lub sijhawm txuag hluav taws xob
(③) Txo cov pwm kub.
④ Txo qhov chaw unwinding
(5)Cov xim saum npoo ntawm cov khoom tsis sib xws
Generation mechanism thiab countermeasures:
① Cov pwm kub tsis sib xws, thiab qhov siab dhau lawm.Cov pwm kub yuav tsum tau tswj kom zoo;
② Tsis zoo fluidity ntawm cov khoom molding, uas ua rau cov fibers tsis sib npaug, feem ntau tuaj yeem ua rau cov molding siab kom nce fluidity ntawm cov yaj;
③Pigment thiab resin tsis tuaj yeem sib xyaw zoo hauv cov txheej txheem ntawm cov xim muab tshuaj txhuam.
Post lub sij hawm: May-04-2021
