Cov ntaub ntawv siv
Cov pwm hlau tsim nyog yuav tsum raug xaiv raws li kev thov. Rau prototyping, hardened pwm steel yog tsis tsim nyog. Feem ntau, ua ntej- steel hlau los yog txhuas yog siv los txo cov nqi thiab pab txhawb kev hloov pwm thaum lub sij hawm prototyping. Cov hlau mos no tseem tuaj yeem tsim cov ntawv xeem txaus thiab cov khoom ua ntej. Ua ntej-cov hlau pwm tawv tawv (xws li P-20 lossis NAKR-55) feem ntau yog siv rau cov pwm loj vim tias cov pwm hlau tsis zoo rau kev siv loj.
Rau ntau ntau lawm, hardened pwm steel yog xav tau rau cov tub ntxhais thiab kab noj hniav. S-7, H-13, thiab stainless hlau 420 yog cov feem ntau siv steels. S-7 yog cov pwm zoo heev uas tuaj yeem siv rau kev ua haujlwm ntev. Yog tias yuav tsum tau yaj thiab pwm kub heev, H-13 steel yuav tsum tau xaiv. H-13 kuj tseem siv tau los tsim cov kub khiav manifolds. H-13 muaj qhov kub thiab txias heev thiab tuaj yeem tiv taus pwm ua haujlwm kub heev yam tsis muaj kev cuam tshuam rau nws qhov hardness.
Stainless hlau yog qhov kev xaiv zoo tshaj plaws rau cov pwm hlau uas yuav tsum muaj kev hnav siab lossis qhov muaj qhov sib txawv loj hauv ib puag ncig. Siab -cov kab noj hniav tuaj yeem ua tau siv A2, ASP23, lossis D-2 hom hlau.
Tag nrho cov pwm hlau tuaj yeem tiv thaiv kev hnav thiab corrosion los ntawm qee hom txheej. Tsuas yog stainless hlau tuaj yeem kho los ntawm vuam thiab machining. Rau cov hlau nrog cov txheej txheem uas twb muaj lawm, kev kho tsuas yog ua tau tom qab cov txheej txheem raug tshem tawm. Tom qab kho, txheej txheej yuav tsum rov qab siv dua.
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Nto tiav
Qhov saum npoo tiav ntawm molded qhov chaw tuaj yeem sib txawv nyob ntawm qhov yuav tsum tau ua kom zoo nkauj, cov neeg siv khoom xav tau, thiab kev ua haujlwm. Los ntawm daim iav-zoo li siab-gloss tiav ntawm SPI #1 mus rau textured nto tiav los ntawm etching, LNP composites tuaj yeem ua tiav txhua yam ntawm molded ib feem nto tiav. Nws yog ib qho tseem ceeb kom nkag siab tias qee cov ntaub ntawv nthuav tawm kev ua tau zoo dua nrog qee qhov pwm nto tiav. Piv txwv li, polypropylene qhia tau hais tias muaj txiaj ntsig zoo tso tawm hauv cov pwm matte dua li hauv siab -gloss pwm. Ua kom tiav qhov ua tiav siab gloss yog qhov nyuaj nrog siab - muab tub lim. Qhov cua
Qhov cua tshuab yog ib feem tseem ceeb ntawm lub voj voog molding kom ua tau zoo tshaj plaws ntawm pwm. Thaum cov khoom siv thermoplastic nkag mus rau hauv pwm kab noj hniav, cua yuav tsum tau muab tshem tawm. Vents feem ntau yog nyob rau ntawm qhov kawg ntawm qhov chaw, nyob ze ntawm txoj kab seam, thiab ntawm cov kab khiav. Cov vents ntxiv nyob ib ncig ntawm txoj kab sib faib tuaj yeem txhim kho qhov ua tau zoo tag nrho. Residual gas nyob rau hauv pwm tshwm li hlawv cov cim ntawm lub molded ib feem. Ib txoj cai tseem ceeb ntawm tus ntiv tes xoo yog tias cov pa roj hauv pwm yuav tsum muaj peev xwm khiav tawm ntawm tus nqi tib yam li cov yas nkag mus rau hauv kab noj hniav.
Tsis muaj qhov tob sib txawv nyob ntawm cov khoom siv - feem ntau, amorphous thermoplastics xav tau ntau dua qhov tsis muaj qhov tob vim lawv cov viscosity siab dua.
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Ib -Cavity thiab Multi-Cavity
Peb hom pwm pwm feem ntau yog siv hauv kev lag luam, tshwj xeeb tshaj yog rau cov pwm siv LNP cov khoom sib xyaw.
Hom ntau tshaj plaws yog ob- phaj txias runner configuration pom nyob rau hauv daim duab 1. Cov khoom yog txhaj rau hauv ib feem los ntawm lub runner bushing thiab lub runner system. Tom qab txias, tag nrho cov molded qhov chaw yog ejected (xws li rooj vag, runners, thiab sprues). Tom qab ntawd cov khoom raug tshem tawm, thiab cov neeg khiav dej num thiab cov sprues tseem raug muab pov tseg lossis rov ua dua tshiab.
Daim duab 2 qhia peb - phaj pwm nrog cov neeg khiav dej txias. Nrog rau qhov tsim no, cov khoom siv yog txhaj rau hauv cov kab noj hniav los ntawm kev khiav thiab sprue system. Tom qab txias, cov pwm qhib, cais ib feem ntawm lub rooj vag thiab cov neeg khiav dej num. Ib feem ntog tawm lawm los ntawm cov neeg khiav dej num. Cov khiav, rooj vag, thiab sprues tseem yuav tsum tau rov ua dua lossis muab pov tseg.
Daim duab 3 qhia txog hluav taws xob kub kub khiav manifold pwm. Lub manifold thiab rooj vag sojntsuam raws yog rhuab mus rau los yog ze ntawm lub polymer lub melting kub, ua kom cov khoom molten. Qhov no tshem tawm qhov xav tau los daws cov khib nyiab ntawm cov neeg khiav dej num, rooj vag, thiab sprues. Cov tshuab no kim dua li cov qauv siv ob- phaj lossis peb- phaj tsim tab sis muaj kev tswj xyuas cov khoom zoo dua qub thiab tsim cov khoom pov tseg me me.
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Kub Khiav
Puv kub khiav pwm, los yog "runnerless" pwm, muaj ntau yam zoo, tab sis yuav tsum tau ua tib zoo tsim kom muaj kev tswj kom zoo ntawm cov yaj ntws mus rau hauv cov pwm kab noj hniav. Thaum cov pwm tsis muaj pwm tsim kom tsis muaj khoom pov tseg thaum lub sijhawm ua haujlwm molding, lawv yooj yim rau cov teeb meem thaum pib, tshwj xeeb tshaj yog nrog semi-crystalline LNP composites, uas yog nquag ua kom khov sai. Cov hauv paus ntsiab lus kom ua raws li muaj xws li:
• Siv tsuas yog zoo- sib npaug kub khiav manifold tshuab tshwj xeeb tsim los rau daim ntawv thov.
• Nyob ntawm cov khoom siv, tus khiav kub tuaj yeem tsim los tso cai ncaj qha rau ntawm qhov chaw uas siv lub qhov rooj qhib lub hauv paus phaj, lossis lub rooj vag valve rau seem - pub dawb molding, lossis lub rooj vag tuaj yeem nyob rau ntawm qhov chaw me me.
• Txoj kev sib tw khiav thiab cov phaj kub kub yuav tsum muab txoj hauv kev zoo rau hauv pwm kab noj hniav thiab yuav tsum tau muab tso rau sab nraud.
• Thaum siv cov iav fiber reinforced resins ntev, lub rooj vag residue yog yam tsis muaj kev zam.
• Siv cov txheej txheem ua tiav los ntawm ib lub chaw tsim khoom kub khiav, tsis yog siv cov khoom sib txawv los ntawm cov tuam txhab sib txawv.
• Lub rooj vag loj nyob ntawm tus nqi thiab hom khoom siv ntxiv, qhov loj / qhov sib piv, thiab phab ntsa thickness.
• Yog xav paub ntxiv txog kev tsim qauv kub, sab laj GE Plastics Group cov neeg ua haujlwm.
2. Phau Ntawv Qhia Txog Cov Txheej Txheem Txheej Txheem Txheej Txheem Txheej Txheem Pwm hauv Kev Lag Luam Ua Lag Luam
Cov lus hauv qab no muab cov neeg ua haujlwm molding thiab cov neeg tsim pwm nrog ntau yam kev kho pwm steel los txhim kho corrosion los yog hnav tsis kam. Lwm cov kev daws teeb meem kuj tseem muaj.
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3. Khiav, Sprues, thiab rooj vag
Sprue Bushings
Thaum siv cov pwm pwm, cov khoom kub nkag mus rau hauv pwm los ntawm sprue bushing. Lub tshuab khiav khiav coj cov khoom siv los ntawm lub rooj vag mus rau hauv pwm kab noj hniav. Tsim kom raug thiab sizing ntawm sprue bushing yog ib qho tseem ceeb rau kev tsim cov yaj tis thiab raug ejection ntawm molded ib feem. Lub sprue "O" txoj kab uas hla yuav tsum yog kwv yees li 20% loj dua lub nozzle tawm txoj kab uas hla los tiv thaiv sprue blockage thaum pwm qhib. Ib daim duab schematic ntawm sprue qhov ntev yog qhia hauv qab no. Qhov "O" qhov ntev kuj tseem cuam tshuam nrog qhov loj ntawm cov khoom thiab cov neeg khiav dej num. Heated runner bushings tuaj yeem siv los hloov cov pa sib tw khiav. Tus nqi pib ntawm kev sib tw ua kom sov (lossis "kub" bushing) yuav siab dua li ntawm "txias" bushing, tab sis nws txo qis pov tseg vim tias nws tshem tawm cov neeg khiav dej num uas khiav raws txhua qhov chaw lossis cov neeg khiav dej num. Nrog cov cua sov bushing, kev tswj ntawm qhov kub thiab txias nkag mus rau hauv lub tshuab khiav yuav ua tau ntau yam meej.
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Runner Design
Cov neeg khiav dej num yuav tsum ua kom luv li sai tau kom txo qis qis qis qis. Ib qho hla -section yog qhov zoo dua. Yog hais tias tus khiav yuav tsum tau muab tso rau hauv ib nrab rau hauv pwm, siv ib tug trapezoidal khiav nrog ib tug puag ncig hauv qab. Semi- cov neeg sib tw khiav thiab tiaj tus tsis muaj txiaj ntsig thiab tsis pom zoo. Cov neeg khiav dej num yuav tsum tso cai rau cov khoom ntws sib npaug thiab tsis txwv rau hauv ib lossis ntau qhov chaw (yog tias siv ntau cov kab noj hniav). Feem ntau, tus khiav yuav tsum tau txo qis hauv txoj kab uas hla los ntawm 20% rau txhua txhua 90 degrees ntawm kev sib hloov. Qhov no yuav tsum tau txiav txim siab thaum tsim lub tshuab khiav. Circular runner diameters feem ntau yog 0.125 "- 0.375" (3.2 - 9.5mm). Duab
Rooj vag |
Lub rooj vag tsim rau LNP cov khoom sib xyaw yuav tsum muab cov npoo machining ntau yam tsis muaj kev tsim hauv - pwm kev ntxhov siab. Nyob ntawm seb hom rooj vag siv (piv txwv li, submarine, ntug, lug, thiab lwm yam), qee qhov yooj yim rooj vag qhov ntev tswj tus nqi sau, tus nqi ntawm cov khoom ntws mus rau hauv pwm kab noj hniav, thiab ib feem ntawm solidification tus nqi.
Phab ntsa thickness txiav txim qhov loj ntawm lub rooj vag, thaum lub geometry ib feem txiav txim lub rooj vag qhov chaw ntawm ib feem. Muaj peb lub rooj vag tseem ceeb: qhov tob, qhov dav, thiab lub ntsej muag. Cov qauv tsim tshwj xeeb rau ntau hom rooj vag muaj nyob rau nplooj ntawv tom ntej.
Rooj vag Loj/Qhov chaw
• Qhov tsawg kawg nkaus rooj vag yog 0.040 "(1mm), 0.100" (2.5mm) rau Verton ntev fiber ntau sib xyaw - puag ncig los yog trapezoidal - 50-60% phab ntsa thickness (rau crystalline composites) - 50-75% phab ntsa thickness (rau amorphous composites)
• Qhov zoo tshaj plaws, lub rooj vag yuav tsum tau muab tso rau qhov chaw ntawm phab ntsa yog thickest - dlhos lub rooj vag ncaj nraim nrog phab ntsa los yog bushing los tiv thaiv backfilling thiab "jetting" (tshwj tsis yog Verton ntev fiber ntau composites) - tunnel rooj vag tsis pom zoo rau Verton composites.
