⑴ Cov duab thiab phab ntsa tuab ntawm cov yas yuav tsum tau tsim los ua kom yooj yim ntawm cov khoom ntws mus rau hauv cov kab noj hniav, thiab sim kom tsis txhob muaj cov fab ntse thiab qhov khoob.
⑵ Lub kaum sab xis yuav tsum loj, 1 degree txog 2 degree rau pwm muaj 15% iav fiber ntau, thiab 2 degree rau 3 degree rau pwm muaj 30% iav fiber. Thaum lub demoulding nqes hav tsis raug tso cai, yuam demoulding yuav tsum tau zam thiab yuav tsum tau siv cov txheej txheem transverse parting.
⑶ Cov ntu ntu ntawm cov txheej txheem pouring yuav tsum loj, thiab cov txheej txheem yuav tsum ncaj thiab luv kom pab txhawb kev tawg ntawm fibers.
⑷ Thaum tsim cov khoom noj khoom haus, kev txiav txim siab yuav tsum tau muab rau kev tiv thaiv tsis txaus sau, anisotropic deformation, tsis sib npaug ntawm cov iav fibers, thiab yooj yim tsim cov cim weld thiab lwm yam tsis zoo. Qhov chaw nres nkoj pub yuav tsum nyias, dav, kiv cua-puab, annular los yog multi-point nyob rau hauv thiaj li yuav ua rau cov khoom ntws turbulent thiab cov iav fiber sib npaug dispersed kom txo tau anisotropy. Nws yog qhov zoo tshaj kom tsis txhob siv rab koob-puab qhov chaw pub noj. Lub qhov ncauj ntu tuaj yeem tsim nyog nce, thiab nws qhov ntev yuav tsum luv.
⑸ Cov tub ntxhais pwm thiab kab noj hniav yuav tsum muaj txaus rigidity thiab lub zog.
⑹ Cov pwm yuav tsum tau ua kom tawv, polished thiab ua los ntawm cov hlau tsis muaj zog, thiab cov khoom hnav yooj yim yuav tsum tau kho yooj yim.
⑺ Lub ejection yuav tsum zoo ib yam thiab muaj zog los pab hloov thiab kho.
⑻ Cov pwm yuav tsum tau nruab nrog lub tank tso pa tawm thiab yuav tsum nyob hauv qhov chaw uas muaj cov cim vuam.
Pwm qhov kub thiab txias
⑴Mould kub cuam tshuam lub voj voog molding thiab molding zoo. Hauv kev ua haujlwm tiag tiag, pwm kub yog teem los ntawm qhov qis tshaj qhov tsim nyog pwm kub ntawm cov khoom siv, thiab tom qab ntawd raug kho kom haum raws li qhov zoo.
⑵ Hais kom raug, pwm kub yog hais txog qhov kub thiab txias ntawm pwm kab noj hniav thaum molding tab tom ua. Nyob rau hauv pwm tsim thiab molding engineering tej yam kev mob teeb tsa, nws yog ib qho tseem ceeb tsis yog tsuas yog yuav tsum tau kom ib tug tsim nyog kub, tab sis kuj yuav faib nws tusyees. .
⑶ Cov pwm pwm tsis sib xws yuav ua rau qhov tsis sib xws thiab kev ntxhov siab sab hauv, yog li ua rau qhov chaw nres nkoj molding muaj qhov deformation thiab warping. duab
⑷ Ua kom cov pwm kub tuaj yeem ua tiav cov teebmeem hauv qab no;
① Ua kom cov crystallinity thiab ntau yam qauv ntawm cov khoom molded.
② Ua kom cov molding shrinkage ntau txaus thiab txo cov post-shrinkage.
③ Txhim kho lub zog thiab kub tsis kam ntawm cov khoom pwm.
④ Txo cov kev ntxhov siab sab hauv seem, molecular alignment thiab deformation.
⑤ Txo cov dej tsis kam thaum lub sij hawm txhaws thiab txo qhov poob siab.
⑥ Ua kom lub ntsej muag ntawm cov khoom molded ci dua.
⑦ Ua kom muaj feem cuam tshuam ntawm burrs tshwm sim hauv cov khoom pwm.
⑧ Ua kom muaj feem ntawm cov hniav nyob ze ntawm lub rooj vag thiab txo qhov kev pheej hmoo ntawm cov hniav nyob deb ntawm lub rooj vag.
⑨ Txo qhov pom tseeb ntawm cov kab sib txuas
⑩ Ua kom lub sijhawm txias.
Dosing thiab plasticization
⑴Nyob rau hauv cov txheej txheem molding, lub plasticizing chav tsev ntawm lub tshuab txhaj tshuaj yog lub luag hauj lwm rau kev tswj (metering) ntawm txhaj tshuaj ntim thiab lub uniform melting (plasticization) ntawm cov yas.
① Cua kub chim (Tsuas Kub)
Txawm hais tias kwv yees li ntawm 60-85% ntawm cov yas yaj yog vim lub zog hluav taws xob tsim los ntawm kev sib hloov ntawm cov ntsia hlau, lub melting lub xeev ntawm cov yas tseem cuam tshuam los ntawm qhov kub ntawm cov cua kub chim, tshwj xeeb tshaj yog kub nyob ze rau pem hauv ntej. cheeb tsam ntawm lub nozzle - qhov kub nyob rau hauv pem hauv ntej cheeb tsam yog siab dhau heev lawm Thaum nws yog siab, nws yog ib qho yooj yim mus ua rau cov khoom dripping thiab hlua rub thaum tshem tawm cov khoom.
②Screw ceev
A. Lub melting ntawm cov yas feem ntau yog vim cov cua sov uas tsim los ntawm kev sib hloov ntawm cov ntsia hlau. Yog li ntawd, yog tias cov ntsia hlau tig nrawm dhau, nws yuav muaj cov teebmeem hauv qab no:
ib. Thermal decomposition ntawm plastics.
b. Cov iav fiber ntau (fiber-ntxiv yas) yog luv luv.
c. Cov ntsia hlau los yog cua sov chim hnav sai dua.
B. Qhov chaw ntawm kev sib hloov ceev tuaj yeem ntsuas los ntawm qhov loj ntawm nws qhov nrawm nrawm:
Circumferential ceev=n (rotation speed) * d (inch) * π (circumferential ratio)
Feem ntau, rau cov yas uas tsis tshua muaj viscosity thiab zoo thermal stability, lub peripheral ceev ntawm cov ntsia hlau pas nrig tig mus txog 1m / s, tab sis rau cov yas uas tsis zoo thermal stability, nws yuav tsum tsawg li ntawm 0. 1.
C. Hauv daim ntawv thov, peb tuaj yeem txo cov ntsia hlau ceev kom ntau li ntau tau kom cov rotating pub tuaj yeem ua tiav ua ntej pwm qhib.
③ Rov qab siab (BACK Pressure)
A. Thaum cov ntsia hlau tig thiab txau cov khoom siv, lub siab uas tau los ntawm cov yaj thawb mus rau pem hauv ntej kawg ntawm cov ntsia hlau yog hu ua rov qab siab. Thaum lub sij hawm txhaj tshuaj molding, nws tuaj yeem hloov kho los ntawm kev kho cov roj tshem tawm siab ntawm kev txhaj tshuaj hydraulic lub tog raj kheej. Lub siab rov qab tuaj yeem ua raws li nram no:
ib. Lub yaj melts ntau uniformly.
b. Colorants thiab fillers yog dispersed ntau tusyees.
c. Cia cov roj tawm ntawm qhov chaw nres nkoj blanking.
d. Kev ntsuas qhov tseeb ntawm cov khoom pub.
B. Cov qib siab rov qab yog txiav txim siab los ntawm viscosity thiab thermal stability ntawm cov yas. Lub siab rov qab siab dhau yuav ua rau lub sijhawm pub mis ntev dua thiab yooj yim ua rau cov yas kom dhau los vim qhov nce ntawm kev sib hloov shear quab yuam. Feem ntau, 5--15kg/cm2 yog qhov tsim nyog.
④ TSHUAJ TIV THAIV, DECOMPRESSION
A. Ua ntej cov ntsia hlau tig thiab txau, cov ntsia hlau raug tshem tawm kom zoo kom txo tau lub siab yaj ntawm qhov kawg ntawm cov pwm. Qhov no yog hu ua pem hauv ntej loosening. Nws cov nyhuv tuaj yeem tiv thaiv cov yaj ntawm lub nozzle los ntawm kev tawm dag zog ntawm cov ntsia hlau. Nws feem ntau yog siv nyob rau hauv kub khiav. Pwm txoj kev.
B. Tom qab kev sib hloov ntawm cov ntsia hlau thiab kev pub mis tiav lawm, cov ntsia hlau tau raug tshem tawm kom zoo kom txo tau lub siab yaj ntawm qhov kawg ntawm cov ntsia hlau. Qhov no yog hu ua rov qab-retraction, thiab nws cov nyhuv tuaj yeem tiv thaiv kom tsis txhob poob ntawm lub nozzle.
C. Qhov tsis zoo yog tias nws yooj yim rau lub ntsiab channel (SPRUE) lo rau cov pwm; looseness ntau dhau tuaj yeem nqus tau hauv huab cua thiab ua rau huab cua cim hauv cov khoom molded.
