Kev soj ntsuam ntawm Kev Txhaj Tshuaj Molding Defects thiab Countermeasures for Solving DefectsAnalysis of Txhaj Molding Defects thiab Countermeasures for Solving Defects

Yog vim li cas rau shrinkage (pits):
Thaum lub tshuab ua haujlwm txias hauv pwm, qhov tsis sib xws ntawm cov yas tshwm sim los ntawm qhov tsis sib xws ntawm phab ntsa thickness ntawm lub workpiece yog hu ua shrinkage. Nws feem ntau tshwm nyob rau ntawm lub dav hlau qhov chaw ntawm phab ntsa thickness, concave zoo, thiab puab puag ncig lub kaum sab xis ntawm cov yas raws li. Lub hauv paus ntsiab lus ntawm kev daws qhov shrinkage yog tias thaum lub sijhawm ua haujlwm txias ntawm lub workpiece, cov nplaum nplaum txuas ntxiv ntxiv cov khoob uas tshwm sim los ntawm qhov shrinkage ntawm lub workpiece. Yog li ntawd, nyob rau hauv ib txwm muaj xwm txheej, nws yog ib qho tsim nyog los xyuas kom meej tias cov channel rau ntxiv cov nplaum nplaum tsis muaj kev cuam tshuam thiab muaj kev txaus siab txaus. Yog tias shrinkage tshwm sim ze ntawm lub rooj vag, nws tuaj yeem daws tau los ntawm kev ncua lub sijhawm tuav. Yog tias shrinkage tshwm sim ntawm cov phab ntsa tuab ntawm cov yas, lub sijhawm txias ntawm cov yas hauv pwm yuav tsum tau txuas ntxiv. Yog hais tias shrinkage yog tshwm sim los ntawm lub zos shrinkage ntawm cov yaj nyob ib ncig ntawm lub insert, uas yog feem ntau yog vim tsis tshua muaj kub ntawm insert, yuav tsum tau ua kom lub kub ntawm lub insert. Yog hais tias deg shrinkage ntawm cov yas yog tshwm sim los ntawm cov khoom tsis txaus, cov khoom yuav tsum tau nce ntxiv Lub sij hawm txias hauv pwm yuav tsum txaus
Kev daws teeb meem hauv kev txhaj tshuaj molding txheej txheem:
Txhaj tshuaj molding yam teeb meem:
Kev txhaj tshuaj tsis txaus;
Nce txhaj tshuaj;
Nce lub sij hawm txhaj tshuaj;
Ua kom lub zog tuav lossis lub sijhawm;
Nce kev txhaj tshuaj nrawm;
Txhim kho lub voj voog txhaj tshuaj;
Ua kom cov compression ceev ntawm cov yas (ua kom rov qab siab, txo qis);
Ua kom qhov kev txhaj tshuaj tsis ntim.
Qhov teeb meem kub: Tus yuam sij rau cov khoom tsim nyog yog nyob rau hauv pwm kub thiab cov khoom kub, uas muaj feem xyuam rau qhov fluidity ntawm cov khoom molten hauv pwm kab noj hniav. Qhov zoo dua qhov fluidity, qhov ntau conducive nws yog rau kev kho tshuab. Feem ntau, cov khoom siv raw tsuas yog siv nyob rau hauv cov qauv ntsuas kub kom pom kev siv, vim tias cov khoom siv kub kub yuav kub hnyiab tau, thiab qhov kub thiab txias yuav tsis muaj fluidity zoo. Nyob rau hauv luv luv, siab los yog tsawg pwm kub thiab cov khoom kub yuav ua rau shrinkage ntawm yas ib feem. Yog li ntawd, nws yog ib qho tsim nyog los ua kom paub qhov zoo ntawm qhov kub thiab txias thaum lub sij hawm debugging txheej txheem.
Cov shrinkage ntau dhau los ntawm cov khoom kub heev;
Cov khoom yog txias dhau, ua rau tsis txaus filling thiab compaction;
Cov pwm kub kub ua rau cov khoom ntawm cov pwm phab ntsa tsis khov sai;
Pwm tsis txaus vim pwm kub tsis txaus;
Hom muaj cov chaw kub hauv zos;
Hloov cov phiaj xwm txias.
Pwm teeb meem: Yog hais tias lub shrinkage nyob deb ntawm lub rooj vag, nws yog feem ntau tshwm sim los ntawm cov tsis txaus txaus ntawm molten cov ntaub ntawv nyob rau hauv ib feem ntawm cov pwm qauv, uas tiv thaiv kom txhob muaj siab kis tau tus mob. Nyob rau hauv luv luv, nyob rau hauv pwm tsim, yuav tsum tau them nyiaj mloog mus rau uniform phab ntsa thickness thiab txo cov phab ntsa thickness ntawm reinforcing ribs, protruding txhua, thiab lwm qhov chaw kom ntau li ntau tau. Kev txhim kho tuaj yeem ua tau hauv cov hauv qab no:
Nce lub rooj vag pwm;
Ua kom cov kev hloov pauv channel;
Nce lub ntsiab ntws channel;
Ua kom lub nozzle aperture;
Txhim kho cov qauv tso tawm ntawm cov pwm;
Sib npaug pwm filling ceev;
Tsis txhob cuam tshuam hauv cov khoom ntim cov dej ntws;
Lub rooj vag pub mis yog teem rau ntawm phab ntsa tuab ntawm cov khoom;
Yog tias ua tau, txo qhov sib txawv ntawm cov khoom phab ntsa thickness;
Cov teeb meem khoom siv:
Ua kom muaj peev xwm ntawm cov yas txhaj tshuaj molding tshuab;
Ua kom lub voj voog txhaj tshuaj zoo li qub.
Qhov teeb meem cua txias:
Qhov txias ntawm cov khoom hauv pwm yog ntev dhau los kom tsis txhob shrinkage los ntawm sab nraud hauv thiab ua kom lub sijhawm txias ntawm qhov chaw;
Txias cov khoom hauv dej kub;
3. Yuav daws qhov teeb meem li cas? (tseem hu ua overflow los yog batch)
● Yog vim li cas rau flash tiam:
Cov khoom flash yog tsuas yog tshwm sim los ntawm qhov tsis xws luag hauv pwm. Lwm cov laj thawj muaj xws li: kev txhaj tshuaj ntau dua li pwm xauv lub zog, cov khoom kub siab dhau lawm, cov pa tawm tsis txaus, noj ntau dhau, cov khoom txawv teb chaws ntawm pwm, thiab lwm yam.
Yuav ua li cas los txiav txim qhov ua rau flash?
Feem ntau, txoj kev txhaj tshuaj luv luv tau txais yuav, uas yog txhaj rau 90 feem pua ​​​​ntawm cov qauv ntawm cov khoom nyob rau hauv kev txhaj tshuaj tsawg thiab tsis muaj kev tswj xyuas. Xyuas seb puas muaj cov npoo flash ntawm tus qauv. Yog tias muaj, nws yog vim tias cov pwm tsis tsim nyog los yog lub zog kaw ntawm lub tshuab txhaj tshuaj molding tsis txaus. Yog tias tsis muaj cov npoo flash, nws yog vim muaj kev hloov pauv hauv kev txhaj tshuaj, xws li kev tswj xyuas siab dhau los lossis kev txhaj tshuaj nrawm heev.
Feem ntau ua rau flash thiab kev daws teeb meem rau flash:
Pwm teeb meem:
Cov kab noj hniav thiab cov tub ntxhais tsis kaw nruj nreem;
Deviation ntawm kab noj hniav thiab cov tub ntxhais;
Lub template tsis sib npaug;
Template deformation;
Cov khoom txawv teb chaws poob rau hauv pwm nto;
Kev tso tawm tsis txaus ntawm pwm;
Cov pwm tso tawm qhov loj dhau lawm.
Cov teeb meem khoom siv:
Qhov projected cheeb tsam ntawm cov khoom tshaj qhov siab tshaj plaws txhaj tshuaj ntawm cov xovxwm txhaj tshuaj;
Kev teeb tsa tsis raug thiab kev hloov pauv ntawm kev txhaj tshuaj molding tshuab template;
Kev txhim kho pwm tsis raug;
Lub xauv quab yuam tsis tuaj yeem khaws cia tas li;
Kev txhaj tshuaj molding tshuab template tsis yog tib yam;
Uneven deformation ntawm rub pas nrig.
(3) Txhaj tshuaj molding mob teeb meem:
① Lub xauv quab yuam tsawg dhau;
② Kev txhaj tshuaj siab dhau lawm;
Lub sijhawm txhaj tshuaj ntev dhau lawm;
Kev txhaj tshuaj nrawm dhau lawm;
Tsis sib xws filling ceev;
Kev cuam tshuam ntawm cov khoom ntws hauv pwm kab noj hniav;
Kev tswj ntau dhau ntawm kev pub mis;
Kev txhaj tshuaj tsis zoo tshwm sim los ntawm kev ua haujlwm.
(4) Qhov kub thiab txias:
Qhov kub ntawm cov khoom thoob yog siab dhau lawm;
Lub nozzle kub siab dhau lawm;
Cov pwm kub siab dhau lawm.
(5) Cov teeb meem khoom siv:
Ua kom muaj peev xwm ntawm cov yas txhaj tshuaj molding tshuab;
Ua kom lub voj voog txhaj tshuaj zoo li qub.
Yuav ua li cas los daws qhov tsis sib haum xeeb ntawm flash thiab shrinkage:
Txo kev txhaj tshuaj nrawm, txo qhov txhaj tshuaj, thiab ua kom lub zog tuav thiab lub sijhawm;
Yog tias tsis muaj cov nplaum nplaum nyob rau lub sijhawm no, nws yog ib qho tsim nyog yuav tsum tau ua kom kub molding;
Yog hais tias lub flash tsuas yog tshwm sim los ntawm lub zos shrinkage thiab pressurization, nws yog tsim nyog los xyuas seb cov kua nplaum nyob ib ncig ntawm lub shrinkage cheeb tsam yog ib yam nkaus thiab nyias, vim hais tias lub nyias cheeb tsam yuav ua rau kom txias thiab molten kua nplaum yuav tsum tau rov qab mus rau lub shrinkage cheeb tsam.
4. Qhov ua rau thiab kev daws teeb meem ntawm cov pob dub:
1) Yog tias qhov kub thiab txias ntawm cov khoom siv lub raj yog siab dhau, ua rau cov khoom molten overheat thiab decompose, nws yog ib qho tsim nyog yuav tsum tau xyuas seb qhov ntsuas kub ntawm cov khoom siv raj puas tawm ntawm kev tswj thiab tsim nyog txo qhov kub ntawm cov khoom raj;
2) Yog hais tias cov khoom molten nyob twj ywm nyob rau hauv cov khoom chim ntev dhau lawm thiab ua rau lub zos overheating thiab decomposition, cov ntaub ntawv chim, nozzle, thiab cov ntsia hlau yuav tsum tau soj ntsuam kom tsis txhob suav tsis tau tuag ces kaum nyob rau hauv lub rov qab valve, thiab kho;
3) Kev sib txhuam thiab overheating ntawm cov khoom siv molten thiab cov khoom phom sij ua rau cov khoom molten decompose. Yog li ntawd, qhov sib txawv ntawm cov ntsia hlau thiab cov khoom thoob yuav tsum tau kho kom tsis txhob muaj zog shear ntau dhau, lub rooj vag me me, lossis kev txhaj tshuaj molding ceev;
4) Cov roj seem hauv cov pwm kub hnyiab vim adiabatic compression, ua rau cov khoom molten overheat thiab decompose. Yog li ntawd, qhov kev txhaj tshuaj nrawm tuaj yeem raug txo kom tsim nyog thiab qhov chaw nres nkoj ntawm cov pwm tuaj yeem txhim kho.
5. Vuam kab (tseem hu ua vuam kab lossis kab sib koom ua ke)
● Yog vim li cas rau qhov tshwm sim ntawm fusion kab:
Yog vim li cas rau cov tsos ntawm fusion kab nyob rau hauv cov khoom yog feem ntau yog vim qhov txias ntawm lub hauv ntej kawg thaum ob los yog ntau tshaj strands ntawm raw cov ntaub ntawv los ntawm txawv cov lus qhia, uas yuav tsis tau tag nrho fuse nyob rau hauv lub hlws ris, uas ua rau ib tug tsis xws luag nyob rau hauv lub tsos. khoom. Feem ntau, nws tsuas yog cuam tshuam rau cov tsos ntawm cov khoom thiab muaj kev cuam tshuam rau kev pleev xim thiab electroplating. Thaum mob hnyav, nws tuaj yeem cuam tshuam rau lub zog ntawm cov khoom (tshwj xeeb tshaj yog thaum siv fiber ntau reinforced resin).
Kev faib tawm ntawm qhov ua rau fusion kab tsim:
Qhov teeb meem kub:
Qhov kub ntawm cov khoom ntim yog tsawg dhau;
Lub nozzle kub yog tsawg dhau;
Cov pwm kub qis dhau lawm;
Cov pwm kub ntawm txoj kab fusion yog tsawg dhau;
Qhov kub ntawm cov yas yaj yog tsis sib npaug.
Kev txhaj tshuaj molding txheej txheem:
Kev txhaj tshuaj siab tsawg dhau lawm;
Kev txhaj tshuaj nrawm dhau lawm.
Pwm teeb meem: (Sim siv lub rooj vag daim ntawv nrog kev sib tw tsawg dua thiab xaiv lub rooj vag txoj hauj lwm kom tsim nyog. Tsis tas li ntawd, sim ua kom tsis txhob muaj qhov sib xyaw ua kom nrawm thiab cuam tshuam ntawm cov khoom ntim cov dej ntws. .)
Cov pa tsis zoo ntawm lub seam (sib koom);
Cov pwm tsis zoo;
Cov pwm hloov pauv channel me dhau;
Lub rooj vag pwm me dhau lawm;
Lub inlet txoj kab uas hla ntawm peb raws yog me me heev;
Lub nozzle qhov ntawm lub tshuab txhaj tshuaj molding yog me heev;
Yog tias lub rooj vag nyob deb dhau ntawm qhov sib koom ua ke, tuaj yeem ntxiv lub rooj vag auxiliary;
Phab ntsa thickness ntawm cov khoom yog nyias heev, ua rau kom ntxov ntxov solidification;
Lub hauv paus yog offset, ua rau ib sab yog nyias;
Cov pwm yog offset, ua rau ib sab yuav nyias;
Lub workpiece yog nyias los yog thickened ntawm seam (sib koom);
Tsis sib xws filling ceev;
Kev cuam tshuam ntawm pwm filling cov khoom ntws;
Kev siv tsis raug ntawm kev tso tawm tus neeg sawv cev.
6. Cov qauv ntws
Classification ntawm flow qauv:
1) Snake flow qauv: Thaum cov yaj nkag mus rau hauv pwm kab noj hniav los ntawm lub rooj vag, nws tsim cov nyhuv dav hlau, uas tshwm rau saum npoo ntawm cov khoom zoo li tus nab, yog li nws hu ua nab ntws qauv;
2) Wave qauv: Qhov ntws ntawm cov yaj hauv pwm kab noj hniav tsis ruaj khov, qee zaum nrawm thiab qee zaum qeeb, nthuav tawm nthwv dej zoo li cov duab ntawm cov khoom, yog li nws hu ua yoj qauv;
3) Radial qauv: Feem ntau, nws tsuas yog tshwm nyob ze ntawm lub rooj vag, thiab thaum yaj nkag mus rau hauv pwm kab noj hniav, nws tsim ib lub dav hlau, uas zoo nkaus li ib tug radial qauv nyob rau saum npoo ntawm cov khoom, li no nws yog hu ua radial qauv;
4) Fluorescent qauv: Lub shear stress generated los ntawm yaj ntws ua rau saum npoo ntawm cov khoom los ua ib tug luster zoo ib yam li lub cev ntawm ib tug firefly, li no nws yog hu ua fluorescent qauv.
Kev daws rau flow qauv:
1) Snake flow qauv:
Thaum qhov tob ntawm lub rooj vag me me dua li qhov tob ntawm qhov nkag ntawm lub pwm kab noj hniav, thiab lub filling ceev ceev, cov kua dej tsis ruaj khov. Thaum lub dav hlau ntws nyob rau hauv pem hauv ntej tau solidified, thiab ntws ntws tom qab nyob rau hauv lub pwm kab noj hniav, ib tug nab zoo li ntws qauv yuav tshwm nyob rau saum npoo ntawm cov khoom.
● Kev daws:
① Hloov cov txheej txheem. Cov txheej txheem ntawm kev txo cov kev txhaj tshuaj molding ceev yuav maj mam tshem tawm cov nyhuv dav hlau, ua rau cov yaj ntws mus rau qhov txuas ntxiv. Qhov txuas txuas ntxiv yuav ua rau cov khoom muaj txiaj ntsig zoo dua. Tsis tas li ntawd, qhov tsim nyog nce pwm kub thiab yaj kub kuj tseem yuav txo cov nyhuv dav hlau thiab pab kom cov yaj mus rau hauv qhov txuas ntxiv.
② Hloov qhov loj ntawm lub qhov rooj pwm. Thaum qhov tob ntawm lub rooj vag me me dua li qhov tob ntawm cov pwm kab noj hniav, qhov nthuav dav ntawm lub dav hlau qhov hluav taws xob ua rau cov tom ntej yaj mus ua ke nrog cov ntug ntawm lub dav hlau tsis deb ntawm pem hauv ntej, yog li ua rau saum npoo ntawm lub dav hlau. cuam ​​tshuam tsawg pom tseeb. Thaum lub rooj vag qhov tob yog sib npaug los yog ze rau lub pwm kab noj hniav qhov tob, lub filling ceev yog tsawg, tsim ib tug ncua ndlwg.
Hloov lub kaum sab xis ntawm lub rooj vag pwm kom lub kaum sab xis ntawm lub rooj vag pwm thiab cov pwm txav pwm yog 4- 5., nyob rau hauv txoj kev no, thaum cov yaj ntws tawm ntawm lub rooj vag, nws yuav xub thaiv cov pwm kab noj hniav. phab ntsa, uas tuaj yeem tiv thaiv qhov tsos ntawm serpentine ntws qauv.
Hloov txoj haujlwm ntawm lub rooj vag pwm. Teem lub rooj vag pwm ntawm qhov ze tshaj plaws rau phab ntsa kab noj hniav (perpendicular mus rau lub rooj vag kev taw qhia). Thaum cov dej ntws tawm ntawm lub rooj vag, nws yuav xub raug thaiv los ntawm cov pwm kab noj hniav phab ntsa, uas tuaj yeem tiv thaiv qhov tshwm sim ntawm lub dav hlau ntws, ua rau nws txuas ntxiv mus, yog li zam kom tsis txhob muaj cov qauv serpentine ntws.
2) Wave qauv:
Thaum lub sij hawm melt filling txheej txheem, cov tshiab yaj ntws tsis tu ncua presses tawm ntawm lub puab txheej, thawb rau pem hauv ntej stagnant ntws ntawm pem hauv ntej yoj. Nyob rau tib lub sij hawm, pem hauv ntej yoj ntug yog tas li stretched. Vim yog cov dej tsis kam, tom qab ntawd nce hauv yaj siab flattens thiab ua rau cov tshiab tsim ripples, ua rau stagnant txaus tsub zuj zuj thiab tsim wavy qauv ntawm cov khoom. Tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej uas qhov kev txhaj tshuaj ceev ceev, qhov kev txhaj tshuaj siab tsawg, lossis cov qauv pwm tsis tsim nyog, cov yaj ntws nres thiab PP crystallization yog nrawm thiab qeeb, uas yog qhov yuav ua rau tsis sib haum xeeb ntawm cov khoom thiab daim ntawv. wavy qauv ntawm qhov chaw.
● Kev daws:
① Hloov cov txheej txheem. Los ntawm kev siv high-pressure thiab low-speed txhaj tshuaj, qhov ruaj khov ntawm yaj ntws tuaj yeem tswj tau, yog li tiv thaiv qhov tshwm sim ntawm cov qauv yoj.
② tsa lub pwm kub. Raws li pwm kub nce, lub fluidity ntawm yaj nce. Rau cov crystalline polymers, qhov kub siab dua yog qhov zoo rau kev sib xws ntawm crystallization, yog li txo qhov tshwm sim ntawm cov qauv yoj.
Hloov cov pwm kab noj hniav. Cov qauv ntawm cov pwm tuaj yeem ua rau cov qauv wavy rau ntawm qhov chaw ntawm cov khoom. Yog hais tias cov npoo thiab cov ces kaum ntawm cov pwm tseem ceeb yog qhov tseem ceeb thiab cov melt flow resistance yog siab, nws yuav ua rau tsis ruaj khov melt flow thiab daim ntawv yoj qauv. Yog li ntawd, hloov cov npoo thiab cov ces kaum ntawm cov pwm tseem ceeb kom tsis txhob hloov pauv thiab tswj kom ruaj khov yaj ntws tuaj yeem tiv thaiv qhov tshwm sim ntawm cov qauv yoj.
Hloov cov thickness ntawm cov khoom. Tsis sib npaug ntawm cov khoom tuaj yeem ua rau cov dej tsis kam ntawm cov yaj kom nce thiab txo qis, uas ua rau tsis ruaj khov ntawm cov yaj. Yog li ntawd, nws raug nquahu kom tsim cov khoom tuab kom zoo li qhov ua tau los tiv thaiv qhov tshwm sim ntawm cov qauv yoj.
3) Radial qauv:
Thaum qhov kev txhaj tshuaj nrawm dhau lawm thiab cov yaj tsim cov tshuaj txhaj tshuaj, vim qhov elasticity ntawm cov yaj, thaum cov yaj ntws nrawm nrawm ntawm cov khoom ntim rau hauv cov pwm kab noj hniav los ntawm lub qhov rooj pwm, qhov elastic rov qab ntawm cov yaj yog ceev heev, ua rau. yaj mus rupture thiab tsim radial qauv.
● Kev daws:
① Hloov cov txheej txheem. Los ntawm kev siv lub zog siab thiab qis qis, lub sijhawm ntws ntawm elastic yaj ntawm tib lub sijhawm ntws tuaj yeem nce ntxiv, thiab qib ntawm elastic tsis ua haujlwm tuaj yeem nce ntxiv, yog li txo qhov tshwm sim ntawm cov qauv radial.
② Hloov cov duab ntawm lub rooj vag pwm. Ua kom lub rooj vag lossis hloov nws mus rau lub kiv cua zoo li qub tuaj yeem ua ntej me ntsis rov qab elasticity ntawm cov yaj ua ntej nws nkag mus rau hauv pwm kab noj hniav, tsis txhob tawg tawg.
③ Txuas qhov ntev ntawm lub ntsiab channel ntawm cov pwm. Ua ntej cov yaj nkag mus rau hauv pwm kab noj hniav, qhov elastic tsis ua hauj lwm ntawm cov yaj kuj yuav zam tau.
④ Hloov lub cuab yeej nrog lub tshuab txuas ntxiv. Lengthening txoj kev ntws ntawm cov yaj ua ntej nkag mus rau hauv cov pwm kab noj hniav nce qib ntawm elastic tsis ua hauj lwm ntawm cov yaj, thiab tseem tuaj yeem zam cov kab radial tshwm sim los ntawm cov tawg tawg.
4) Fluorescent qauv:
Thaum cov yaj ntws hauv cov pwm kab noj hniav, ib qho kawg ntawm cov saw hlau molecular nyob ze ntawm cov txheej txheem solidification yog tsau rau ntawm cov txheej txheem solidification, thaum lwm qhov kawg yog ncab raws cov kev taw qhia ntws los ntawm cov saw hlau molecular uas nyob ib sab. Vim qhov siab tshaj plaws khiav tsis kam thiab tshaj tawm ntawm cov yaj nyob ze ntawm phab ntsa kab noj hniav, thiab qhov tsawg kawg nkaus khiav tsis kam thiab tshaj tawm ntawm qhov nruab nrab ntawm cov pwm kab noj hniav, qhov kev tshaj tawm gradient yog tsim nyob rau hauv cov kev taw qhia ntws. Yog li ntawd, nyob rau hauv cov ntaub ntawv ntawm kev txhaj tshuaj tsawg, siab txhaj tshuaj, los yog nyias cov khoom thickness, lub shear quab yuam thiab orientation ntawm cov yaj nyob ze ntawm lub pwm kab noj hniav phab ntsa yog lub zog tshaj, thiab cov polymer exhibits nyob rau hauv kev nyuaj siab thaum stretched thaum lub sij hawm khiav, ua rau cov tsos. ntawm cov kab fluorescent nyob rau saum npoo ntawm cov khoom.
● Kev daws:
① Hloov cov txheej txheem. Los ntawm kev siv nruab nrab siab thiab nruab nrab ceev txhaj tshuaj, raws li qhov kev txhaj tshuaj nrawm nce, lub sijhawm txias ntawm cov yaj ntawm tib ceg ntws ntev yuav txo qis, thiab lub zog ntawm chav tsev ntim ntawm cov yaj yuav qeeb. Cov kev ntxhov siab sab hauv ntawm cov khoom tsis muaj zog, txo cov tsos ntawm cov kab fluorescent ntawm qhov chaw ntawm cov khoom.
② Ua kom kub ntawm cov cuab yeej sib tsoo. Cov pwm kub siab tuaj yeem ua kom lub zog ntawm cov macromolecules, txo cov kev taw qhia ntawm molecular thiab kev ntxhov siab sab hauv, yog li txo qhov pom ntawm fluorescent kab ntawm cov khoom.
Hloov cov pwm kab noj hniav thiab ua kom cov thickness ntawm cov khoom. Lub thickness ntawm cov khoom yog qhov loj, cov yaj txias maj mam, lub sij hawm so ntawm kev ntxhov siab yog qhov ntev, thiab kev xav txog kev ntxhov siab yuav txo qis, yog li txo cov qauv fluorescence.
Kev kho cua sov (qhov cub ci lossis dej kub boiling). Kev kho cua sov ua kom lub zog ntawm macromolecules, txo lub sijhawm so, thiab txo cov qauv fluorescence.
7. Npuas thiab paj qauv
● Ua rau tshwm sim:
Npuas yog tshwm sim los ntawm cov yas tsis txaus nyob rau hauv cov pwm kab noj hniav, ua rau cov yas sab nraud kom txias thiab khov, thiab cov yas sab hauv kom ntsws thiab tsim lub tshuab nqus tsev (ceev sab nraud thiab qeeb rau sab hauv). Feem ntau yuav yog vim tsis qhuav ntawm cov ntaub ntawv hygroscopic thiab residual monomers thiab lwm cov tebchaw hauv cov ntaub ntawv.
Txhawm rau txiav txim siab qhov ua rau huab cua qhov, tsuas yog saib seb cov npuas hauv cov khoom yas tshwm sim tam sim ntawd thaum qhib pwm lossis tom qab txias. Yog tias nws tshwm sim tam sim ntawd thaum qhib pwm, nws feem ntau yog vim cov khoom siv teeb meem. Yog tias nws tshwm sim tom qab txias, nws yog vim pwm lossis txhaj tshuaj molding.
Muaj feem cuam tshuam:
Yas muaj cov dej noo thiab cov tshuaj volatile;
Cov khoom kub siab dhau los yog qis dhau;
Kev txhaj tshuaj siab tsawg dhau lawm;
Qhov loj ntawm tus khiav thiab lub rooj vag loj heev;
Cov yas tsis qhuav txaus thiab muaj cov dej noo;
Yas decomposes;
Kev txhaj tshuaj nrawm dhau lawm;
Cov pwm tsis zoo;
Cua yog qhia los ntawm qhov kawg pub.
8. Tsis muaj kua nplaum (tseem hu ua cov khoom tsis txaus, hais txog qhov ua tsis tiav ntawm cov khoom molten rau hauv pwm kab noj hniav, ua rau cov khoom tsis txaus hauv lub workpiece)
● Ua rau thiab kev daws teeb meem:
⑴ Cov khoom siv vim li cas:
Kev cuam tshuam ntawm cov khoom hauv lub hopper;
Ib nrab los yog ua tiav blockage ntawm neckline ntawm lub hopper (bridging)
Kev pub mis tsis txaus;
Lub chaw ua haujlwm ntawm kev tswj tus nqi pub mis yog qhov qub;
Lub peev xwm ntawm lub tshuab txhaj tshuaj molding yog me me dhau (qhov hnyav ntawm cov khoom yas tuaj yeem suav txog 85 feem pua ​​​​ntawm tag nrho cov nyiaj melting ntawm lub tshuab);
Lub nozzle yuav raug thaiv los yog lub qhov nozzle yuav me dhau;
Kev txhaj tshuaj molding lub voj voog tsis zoo tshwm sim los ntawm cov khoom siv.
⑵ Vim li cas rau kev txhaj tshuaj molding:
Kev txhaj tshuaj siab tsawg dhau lawm;
Kev txhaj tshuaj ntau dhau thaum lub sijhawm txhaj tshuaj;
Lub sij hawm txhaj tshuaj yog luv heev;
Lub sij hawm txhaj tshuaj tag nrho yog luv heev;
Kev txhaj tshuaj nrawm dhau lawm;
Kev cuam tshuam ntawm cov khoom ntws hauv pwm kab noj hniav;
Kev txhaj tshuaj molding lub voj voog tsis zoo tshwm sim los ntawm kev ua haujlwm.
⑶ Qhov kub thiab txias:
Ua kom qhov kub ntawm cov khoom ntim;
Nce lub nozzle kub;
Nce pwm kub;
Tshawb xyuas cov thermocouples, tiv thaiv cua sov coils, thiab cua sov tshuab;
Xyuas cov pwm kub tswj cov cuab yeej.
(4) Pwm yog vim li cas:
Cov channel ntws tsawg dhau;
Lub rooj vag me dhau;
Tsis tsim nyog rooj vag txoj hauj lwm;
Tsis txaus cov rooj vag;
Cov khoom txias qhov qhov me me dhau los tsis muaj;
Cov pa tsis txaus (cov pa ntxiv yuav tsum tau muab ntxiv rau hauv thaj chaw uas muaj kev txhaj tshuaj tsis txaus).
⑸ Cov khoom ua rau: cov khoom siv tsis zoo.
Yuav ua li cas los daws qhov tsis sib xws ntawm cov kua nplaum tsis txaus thiab flash?
Nce cov pwm kub;
Yog tias cov pwm zoo li qub, xyuas seb qhov ntsuas phoo ntawm lub tshuab txhaj tshuaj molding zoo li cas;
Yog tias tsis muaj cov nplaum nplaum hauv lub horn mesh, cov txheej txheem txhaj tshuaj molding yuav tsum tau hloov kho;
Nws kuj tseem yuav tsum tau xyuas seb qhov ntxig ntawm cov pwm yog deformed los yog warped.
9. Deformation
Lub warping thiab deformation ntawm txhaj tshuaj molded khoom yog cov teeb meem nyuaj heev. Lub hom phiaj tseem ceeb yuav tsum yog nyob rau ntawm tus tsim pwm, thaum lub sij hawm hloov cov nyhuv ntawm cov txheej txheem yog heev txwv. Qhov ua rau thiab kev daws teeb meem ntawm warping thiab deformation tuaj yeem xa mus rau cov khoom hauv qab no;
Thaum cov residual kev ntxhov siab ua rau deformation vim molding tej yam kev mob, kev ntxhov siab yuav raug tshem tawm los ntawm kev txo cov kev txhaj tshuaj, ua rau pwm thiab ua rau pwm kub sib xws, nce resin kub, los yog siv txoj kev annealing.
Thaum muaj kev ntxhov siab los ntawm kev demolding tsis zoo, nws tuaj yeem daws tau los ntawm kev nce tus naj npawb lossis thaj tsam ntawm cov pas nrig, teeb tsa lub kaum sab xis, thiab lwm txoj hauv kev.
Vim yog txoj kev ua kom txias tsis raug, qhov txias tsis sib xws lossis lub sijhawm txias yuav tshwm sim