Cov khoom thiab cov txheej txheem ntawm cov yas txhaj tshuaj molding yog cuam tshuam los ntawm ntau yam. Cov yas sib txawv yuav tsum tau tsim cov txheej txheem tsim kom haum rau lawv cov khoom kom tau txais cov khoom siv zoo tshaj plaws.
Cov ntsiab lus txhaj tshuaj molding yog raws li nram no:
Ib, shrinkage tus nqi
Cov yam tseem ceeb uas cuam tshuam rau txoj kev shrinkage ntawm thermoplastic plastics yog raws li nram no:
1. Hom yas
| TSIS MUAJ. | Yasnpe | ShrinkageRnoj |
| 1 | PAB 66 | 1% -2% |
| 2 | PAB 6 | 1% -1.5% |
| 3 | PAB 612 | 0.5% -2% |
| 4 | PBT | 1.5% -2.8% |
| 5 | PC | 0.1% - 0.2% |
| 6 | POM | 2% -3.5% |
| 7 | PP | 1.8% -2.5% |
| 8 | PS | 0.4% - 0.7% |
| 9 | PVC | 0.2% - 0.6% |
| 10 | ABS | 0.4% - 0.5% |
2.Qhov loj thiab cov qauv ntawm cov pwm molding. Cov phab ntsa tuab dhau los lossis qhov cua txias tsis zoo tuaj yeem cuam tshuam qhov shrinkage. Tsis tas li ntawd, lub xub ntiag los yog tsis muaj inserts thiab qhov layout thiab kom muaj nuj nqis ntawm inserts ncaj qha cuam tshuam cov kev taw qhia ntws, ceev tis thiab shrinkage kuj.
3.Daim ntawv, qhov loj me thiab kev faib khoom ntawm lub qhov ncauj. Cov xwm txheej no cuam tshuam rau cov kev taw qhia ntawm cov khoom ntws, ntom xa khoom, kev faib tawm ntom ntom thiab shrinkage nyhuv thiab sib sau ua ke.
4.Pwm kub thiab txhaj tshuaj siab.
Pwm kub yog siab, yaj ceev yog siab, yas shrinkage tus nqi yog siab, tshwj xeeb tshaj yog cov yas nrog siab crystallinity. Qhov kub thiab txias sib npaug ntawm cov khoom yas kuj tseem cuam tshuam ncaj qha rau qhov shrinkage thiab kev taw qhia.
Kev tuav cia siab thiab lub sijhawm kuj tseem cuam tshuam rau kev cog lus. Kev kub siab, lub sij hawm ntev yuav ntsws tab sis cov kev taw qhia loj. Yog li ntawd, thaum pwm kub, siab, txhaj molding ceev thiab lub sij hawm txias thiab lwm yam kuj yuav tsim nyog los hloov shrinkage ntawm yas qhov chaw.
Pwm tsim raws li ntau yam ntawm cov yas shrinkage ntau, yas phab ntsa thickness, zoo li, pub inlet daim ntawv loj thiab tis, raws li kev paub los txiav txim lub shrinkage ntawm txhua feem ntawm cov yas, ces xam cov kab noj hniav loj.
Rau high-precision yas qhov chaw thiab nws yog ib qho nyuaj rau tuav lub shrinkage tus nqi, nws yog feem ntau tsim nyog siv cov nram qab no txoj kev los tsim pwm:
a) Siv cov khoom me me ntawm cov yas hauv cov kab uas hla sab nraud thiab qhov loj me me kom muaj chaw rau kev hloov kho tom qab kuaj pwm.
b) Pwm kuaj los txiav txim siab cov txheej txheem casting, qhov loj me thiab kev ua haujlwm.
c) Kev hloov pauv loj ntawm cov khoom yas yuav tsum tau rov ua dua yog txiav txim siab tom qab rov ua dua (qhov ntsuas yuav tsum yog 24 teev tom qab stripping).
d) Hloov cov pwm raws li qhov tseeb shrinkage.
e) Cov tuag tuaj yeem rov ua dua thiab tus nqi shrinkage tuaj yeem hloov kho me ntsis los ntawm kev hloov cov txheej txheem kom tsim nyog kom tau raws li qhov yuav tsum tau ua ntawm cov khoom yas.
Thib ob,Liquidity
- Lub fluidity ntawm thermoplastics feem ntau yog soj ntsuam los ntawm ib tug series ntawm indexes xws li molecular hnyav, yaj index, Archimedes kauv ntws ntev, kev ua tau zoo viscosity thiab txaus ratio (ntev ntev / yas phab ntsa thickness). Rau cov yas ntawm tib lub npe, cov lus qhia tshwj xeeb yuav tsum tau kuaj xyuas seb lawv cov fluidity puas haum rau kev txhaj tshuaj molding.
Raws li cov qauv tsim pwm, qhov fluidity ntawm cov khoom siv feem ntau tuaj yeem muab faib ua peb pawg:
a) Zoo fluidity ntawm PA, PE, PS, PP, CA thiab polymethylthyretinoene;
b) Nruab nrab ntws polystyrene resin series (xws li ABS, AS), PMMA, POM, polyphenyl ether;
c) Tsis zoo fluidity PC, tawv PVC, polyphenyl ether, polysulfone, polyaromatic sulfone, fluorine yas.
- Lub fluidity ntawm ntau yam yas kuj hloov vim muaj ntau yam tsim. Lub ntsiab influencing yam yog raws li nram no:
a) Qhov kub thiab txias. Cov khoom siv kub kub yuav ua rau kom cov kua dej ntau ntxiv, tab sis cov khoom siv sib txawv kuj sib txawv, PS (tshwj xeeb tshaj yog cuam tshuam tsis kam thiab siab dua MFR tus nqi), PP, PA, PMMA, ABS, PC, CA plastic liquidity nrog kub hloov. Rau PE, POM, tom qab ntawd kub nce thiab txo qis muaj kev cuam tshuam me ntsis rau lawv cov dej.
b) Siab. Txhaj tshuaj molding siab ua kom yaj los ntawm kev ua haujlwm shear, cov kua dej kuj tseem nce ntxiv, tshwj xeeb tshaj yog PE, POM rhiab dua, yog li lub sijhawm ntawm kev txhaj tshuaj molding siab los tswj cov dej ntws.
c) Tuag qauv. Xws li cov txheej txheem nchuav, qhov loj me, qhov teeb tsa, qhov system txias, qhov tso pa tawm thiab lwm yam cuam tshuam ncaj qha cuam tshuam rau qhov tseeb ntawm cov khoom molten hauv kab noj hniav.
Pwm tsim yuav tsum tau ua raws li kev siv cov yas ntws, xaiv cov qauv tsim nyog.Molding tuaj yeem tswj cov khoom kub, pwm kub thiab txhaj tshuaj siab, txhaj tshuaj ceev thiab lwm yam los kho qhov ntim kom tau raws li qhov xav tau molding.
Lub sij hawm xa tuaj: 29-10-21