Photosensitive resin hais txog cov khoom siv rau lub teeb curing sai prototyping.Nws yog kua lub teeb curing resin, los yog kua photosensitive resin, uas yog tsim los ntawm oligomer, photoinitiator thiab diluent.Cov photosensitive resin siv rau SLA yog qhov pib zoo ib yam li cov teeb pom kev zoo tib yam prepolymer.Txawm li cas los xij, txij li lub teeb ci siv rau SLA yog lub teeb monochromatic, uas txawv ntawm lub teeb ultraviolet zoo tib yam, thiab muaj cov kev xav tau ntau dua rau kev kho tus nqi, cov photosensitive resin siv rau SLA feem ntau yuav tsum muaj cov yam ntxwv hauv qab no.
(1) Tsawg viscosity.Lub teeb curing yog raws li CAD qauv, resin txheej los ntawm txheej superimposed rau hauv qhov chaw.Thaum ib txheej tiav lawm, vim tias qhov nro ntawm cov resin yog ntau dua li cov khoom siv cob, nws yog qhov nyuaj rau cov kua resin tuaj yeem npog lub npoo ntawm cov khoom kho resin The resin kua theem yuav tsum tau khawb thiab coated ib zaug nrog. kev pab los ntawm tsis siv neeg scraper, thiab txheej tom ntej no tuaj yeem ua tiav tsuas yog tom qab cov kua theem yog leveled.Qhov no yuav tsum tau cov resin kom muaj viscosity tsawg los xyuas kom meej nws zoo leveling thiab ua haujlwm yooj yim.Tam sim no cov resin viscosity feem ntau yuav tsum tau qis dua 600 CP · s (30 ℃).
(2) Kev kho me me shrinkage.Qhov kev ncua deb ntawm cov kua resin molecules yog van der Waals quab yuam qhov deb, uas yog hais txog 0.3 ~ 0.5 nm.Tom qab kho, cov molecules yog crosslinked thiab tsim ib lub network qauv.Qhov kev ncua deb ntawm molecules hloov mus rau covalent daim ntawv cog lus deb, uas yog hais txog 0.154 nm.Obviously, qhov kev ncua deb ntawm molecules ua ntej thiab tom qab kho txo.Qhov kev ncua deb ntawm ib qho ntxiv polymerization cov tshuaj tiv thaiv ntawm cov molecules yuav tsum raug txo los ntawm 0.125 ~ 0.325 nm.Txawm hais tias nyob rau hauv cov txheej txheem ntawm kev hloov tshuaj, C = C hloov mus rau CC thiab daim ntawv cog lus ntev nce me ntsis, qhov kev pab cuam rau kev hloov pauv ntawm kev sib cuam tshuam ntawm intermolecular yog tsawg heev.Yog li ntawd, lub ntim shrinkage yog inevitable tom qab kho.Nyob rau tib lub sijhawm, ua ntej thiab tom qab kho, los ntawm kev tsis sib haum mus rau ntau qhov kev txiav txim, kuj tseem yuav muaj qhov ntim shrinkage.Shrinkage yog qhov tsis zoo rau cov qauv tsim, uas yuav ua rau muaj kev ntxhov siab sab hauv, uas yooj yim ua rau deformation, warpage thiab tawg ntawm cov qauv, thiab cuam tshuam rau qhov tseeb ntawm qhov chaw.Yog li ntawd, kev tsim cov khoom qis qis yog qhov teeb meem tseem ceeb ntawm SLA resin tam sim no.
(3) ceev curing tus nqi.Feem ntau, lub thickness ntawm txhua txheej yog 0.1 ~ 0.2 hli rau txheej txheej los ntawm txheej thaum molding, thiab ib feem yuav tsum tau kho rau ntau pua mus rau txhiab txheej.Yog li ntawd, yog tias cov khoom yuav tsum tau tsim nyob rau hauv ib lub sij hawm luv luv, tus nqi kho yog qhov tseem ceeb heev.Lub sij hawm raug ntawm lub laser beam mus rau ib qho taw tes tsuas yog nyob rau hauv thaj tsam ntawm microseconds mus rau milliseconds, uas yog yuav luag sib npaug rau lub xeev zoo siab lub neej ntawm photoinitiator siv.Tsawg curing tus nqi tsis tsuas yog cuam tshuam cov nyhuv curing, tab sis tseem cuam tshuam ncaj qha rau kev ua haujlwm ntawm lub tshuab molding, yog li nws yog qhov nyuaj rau kev tsim khoom lag luam.
(4) Me me o.Nyob rau hauv tus txheej txheem ntawm kev tsim qauv, cov kua resin tau them rau ntawm ib co kho workpieces, uas muaj peev xwm nkag mus rau hauv cov kho qhov chaw thiab swell lub kho resin, uas ua rau kom qhov loj ntawm ib feem.Tsuas yog thaum cov resin o me me tuaj yeem lav qhov tseeb ntawm cov qauv.
(5) Lub teeb rhiab heev.Vim tias SLA siv lub teeb monochromatic, nws yuav tsum muaj lub wavelength ntawm photosensitive resin thiab laser yuav tsum sib phim, uas yog, lub wavelength ntawm laser yuav tsum nyob ze rau qhov siab tshaj plaws nqus wavelength ntawm photosensitive resin kom deb li deb tau.Nyob rau tib lub sij hawm, qhov nqus wavelength ntau ntawm photosensitive resin yuav tsum nqaim, thiaj li yuav xyuas kom meej tias curing tshwm sim tsuas yog nyob rau hauv lub point irradiated los ntawm laser, thiaj li mus txhim kho cov raug raug ntawm qhov chaw.
(6) High curing degree.Lub shrinkage ntawm post curing molding qauv yuav raug txo kom tsawg, thiaj li yuav txo tau tus ncej curing deformation.
(7) Lub zog ntub dej ntau.Lub zog ntub dej siab tuaj yeem ua kom ntseeg tau tias tsis muaj deformation, nthuav dav thiab interlayer tev tawm hauv cov txheej txheem tom qab kho.
Post lub sij hawm: Jun-01-2022