Txoj Ci Ntawm Qhov Chaw Inject Thiab Yuav Tsum Siv Lis Lwm Hom

Txoj Kab Roj Thiab Lwm Yam Tsis Txaus: Ceev Caij Thiab Kev Txhim Kho Kev Pib

Paub Txog Txoj Kab Roj Thiab Lawv Lub Hom Phiaj, Lub Npeej Siv Thiab Kev Pib Ceev Caij

Txoj kab roj pom tau yam kab ntsug thiab daim duab nyob rau hauv qhov chaw ntxuav rau yog los ntawm kev sib txawv ntawm kev ntxuav rau hauv injection Molding Process . Cov ceev caij tseem ceeb yog:

• Kev sib txawv ntawm kev ntxuav siab , tshpecially rau hauv cov hom polymer semicrystalline uas poob tsis zoo li ib leeg
• Daim duab khoom tsis zoo , xws li cov chaw ntxuav me me lossis cov kab tog nyiag nyiag uas tshimm siab kev ntxuav
• Kev sib txawv ntawm kev tsim , xws li kev pib tuaj tsis zoo lossis tshuab kub tsis zoo

Zoo uas Plastics Technology Institute piav hais tias nyob rau hlis 2023, 62% ntawm cov nqaij muag hauv qhov chaw tsim los ntawm qhov kho tseem ceeb thiab tshuab kub tsis zoo hauv qhov chaw pib.

Cov Caus Nyob Ntawm Short Shots: Kev Pib, Kev Tso Hnub, thiab Kev Tsis Pom Zoo

Short shots pom thaum dundun plastic tsis tau pib ncav cuag. Cov ntsiab lus tseem ceeb yog:

1. Kev pib tsis txaus thiab kom tshem tawm cov kev tsis pom zoo hauv qhov chaw ncav cuag
2. Kev tso hnub tsis zoo , uas tso dej ruaj khov thiab tsim kev pib dua
3. Lub sijhawm muaj zog siab kev nyuaj siab rau kev txhim kho cov duab ntau

Cov qhov kho tshuab tsis sau nyiag tau ib txwm muab rau 34% ntawm cov kev tsis pib hlo tshuab nyob rau hauv cov tshuab kho tshuab siv zog (Polymer Engineering Reports, 2022).

Kev lag luam cov caij ntim rau kev tsws cov teeb meem uas muaj feem cuam rau kev ntim

Kev txhim kho cov caij tseem ceeb tuaj yeem txo cov teeb meem uas muaj feem cuam rau kev ntim:

*Qhov kho tseem cuab yuav sib txawv txog leej ntsiab nrhiav thiab daim duab
**Sauv saub rooj teeb meem

Muab ntxuav siab khiav ceev ntau dua li 20% nrog lub sijhawm npog 2 feeb tuaj yeem txo qhov tsis zoo ntawm kev sib txuas nrog rau hauv cov ntaub ntawv polypropylene, raws li cov ntaub ntawv simulation los ntawm cov tshuab soj ntsuam mold flow . Saib xyuas tag nrho cov kev hloov pauv los ntawm kev them nyiaj DOE (Kev them nyiaj kev them nyiaj).

Zaj thawj thiab qhov kho taw: Txhim kho kev sov thiab kev nyuaj siab hauv plua

Cov ntsiab lus loj thiab kev nyuaj siab khiav tso caij li cas txam theej rau kev tsim kho taw

cov ntawv sau no tsuas yog qhov chaw nyiag uas tshwm sim thaum tsav neeg muaj qhov loj thiab sib txawv nyob rau hauv khib, nws yuav tshwm sim li qhov nqaij ntawm qhov chaw. lub hauv npog feem ntau yuav nyiam ntxhiab dhau dua li sab nraud, yog li nws yuav hlawv mus sab nraud thaum nws sib txuas, tshwm sim qhov chaw tog. thaum tsis muaj ntau zog nyob rau hauv qhov chaw tsav neeg nyob hauv kev tsav tsheb, cov teeb meem no yuav raug dua. ntau tus neeg tsav tsheb pom tias yog tshem qhov nqaij ntawm sink los ntawm 25% mus rau 40%, feem ntau yog tshem zog nyob rau hauv mold los ntawm 10% mus rau 15%, thiab ntxiv ob peb seconds nyob rau hauv holding phase. zoo li cas, tej zaum xwb, txhawj xeeb tshaj plaws yog dab tsi yam khoom uas lawv ua haujlwm nrog vim yog ib qho khoom sib txawv feem ntau yuav muaj kev sib txawv

Kev tsis zoo ntawm kev sov thiab kev lag lub zog tsis zoo li, txawv rau kev kho taw

Zib tug mej kev ua haujlwm tsis zoo yog tias muaj kev sib txawv hauv kev sov taws, uas tshuav tau qhov chaw nyiag hauv qhov chaw. Txawm tias tsuas muaj qhov sib txawv me me ntawm teb nqi hauv qhov chaw sib txawv, xws li nyob rau sab 15 los 20 degrees Celsius, tuaj yeem cuam tshuav rau kev sib txawv ntawm kev hlawv mus li 0.5 los 1.2 percent, uas cuam tshuav rau qhov chaw kom plooj lossis nqaij. Qee yam khwv tshuab xws li polypropylene thiab nylon 6/6 feem ntau muaj teeb meem heev vim lawv tsim cov crystal thaum sov taws. Thaum kom tuaj no, tus khaub ncaws yuav tsum tiv thaiv teb nqi zoo li ib puag ncig plus lossis minus 3 degrees hauv tag nrho qhov chaw. Tus no tuaj yeem muaj los ntawm kev sau khoom tswj hwm kev sov taws lossis siv kev ua haujlwm sov taws zoo sib xws rau qhov chaw tseem ceeb. Cov kev ua no feem ntau lwm plaws rau kev plooj mus li 30 los 50 percent, uas tsim nyog rau kev tswj xyuas lub zog.

Kev lag luam thiab kev tshuaj xyuas rau kev nyiam siab

• Kev lag luam hloov : Tshawb kho cov ntsiab lus loj los nrog ribs lossis gussets kom txo qhov sib txawv ntawm nqi
• Kawm kev tshuab : Txhim kho suab ntawm dej nkhaus lossis tshuab ntxuav hluav taws xob 10–15°C dua qhov chaw sib piv rau qhov sib txawv hauv qhov sib txawv ntawm khoom, kom lag dhau qhov xav tau
• Khoom Siv Xaiv : Siv cov khoom siv tsawg (xws li cov khoom muaj mineral) kom tsawg qhov sib txawv ntawm qhov loj meem

Kev txhim kho qhov ceev thiab qhov chaw nrog kev sim kawm dej nkhaus tuaj yeem txeeg tseg kev sib txawv uas cuam tshuam rau kev lag luam. Cov sensor nyhuv nyhuv sab hauv tam sim no tuaj yeem pab kho kev lag luam hauv yam sib npaug, kom tsawg dua 18–22% hauv cov khoom siv rau lub tshuab mob.

Cov tog raj thiab kev tso tawm: Qhov nyuaj siab ntawm kev tso tawm dej nkhaus hauv cov khoom tshuab

Kev tsim thiab qhov nyuaj siab ntawm cov tog raj thaum dej nkhaus rov miv los

Cov tog raj tsim thaum polymer hlub tshuab tawm ntawm cov ntaus qhw thiab rov miv los tsis muaj kev sib xyaw zoo. Qhov no feem ntau tsawg dua 70% qhov zog tshaj qhov chaw ntxiv (IMS Tex). Txawv npaum li cov dej nkhaus tshwj xeeb, cov tog raj tsis muaj zog txaus rau cov kev siv tseem ceeb xws li cov khoom siv rau kev kho mob thiab cov bracket rau lub tshuab mob.

Kev Txhaj Tawm thiab Kev Siv Txhais Sijhawm Rau Cov Chaw Nyhuv Tsheej

Kev txhaj tawm chaw tsim nyog yuav tshwm sim kev sau hauv qab tawm, txhaj tawm cov chaw nyhuv kom tau raws li kev flow convergence ua ntej muaj kev sib poob. Nce sijhawm ntawm thawj zaug los ntawm 15–25°F (8–14°C) yuav ploj sijhawm fusion nyob rau qhov chaw pib. Cov khoom siv xwm yeem zoo li cov uas siv hauv Lub Npeej Pheej Ntaub Hlau 2024 Study yuav sim kev flow fronts kom daws teeb meem kev txhaj tawm thiab kev caij nyoog.

Qhov tsis zoo ntawm Jetting: Kev Nqa Tawm Ntau thiab Qhov Tsom Nozzle

Kev rov qab tuaj yeem pom los ntawm cov kab ntsug nyiaj nyiaj ntawm cov chaw uas thaum dundob plastic rov qab hauv lub thawv tsis raug thiab tsis tshwm sim ib qhov saum npoo smooth. Teeb meem no feem ntau tshwm sim nrog cov kauj ruam leej li 0.04 inches lossis 1 millimeter, tshpecially thaum kev xa injection tuaj txog dua li 4 cubic inches per second. Thaum kho tej no, cov neeg tsim khoom feem ntau siv cov nozzle tapered lossis cov qauv hot runner systems. Cov kev daws teeb meem no pab tshwm sim ib qhov flow pattern smooth, layered uas hu ua laminar flow uas yog qhov tseem ceeb heev rau kev tsim cov khoom sab nraum hlub, tshaib uas neeg siv xav tau rau cov khoom zoo li phone cases thiab lwm yam khoom glossy.

Flash, Voids, thiab Surface Defects: Mold Integrity thiab Material Handling

Kev Tshwm Sim ntawm Flash Los ntawm Parting Line Misalignment thiab Clamp Force

Flash yuav tshwm sim thaum duab ntau hnyav taj taj poob los ntawm cov chaw me me nyob rau hauv qhov kho, feem ntau yog vim tus ntsiag tug tsis muaj kev sib cuag zoo lossis tsis muaj nuj nqi tshem kom nyob ib leeg. Txhawm rau xyuas cov ntaub ntawv uas tau tsim los ntawm xyoo dhau los, nyob rau sab nraud ob hlis ntawm cov teeb meem flash no tuaj yeem txhais tau tias yog qhov tooling cuam tshwv. Thiab yog tias nuj nqi tshem saum npoo li 3 rau 5 tons rau hauv ib square centimeter, duab ntau hnyav feem ntau yuav tshwm sim. Cov neeg tsim khoom pom tias thaum lawv rov sau qhov kho dua ib zaug txog li 50,000 lub sijhawm tsim khoom, nws muaj kev pab loj. Thaum ntxiv cov pressure sensors los saib seb nuj nqi tshem meej tshaj plaws, nws pab rau cov chaw tsim khoom kom lwm li 90% cov teeb meem flash.

Cov chaw ncaj nraim, duab ntau hnyav, thiab cov duab ntau hnyav los ntawm dej lossis kub dhau

Txoj hauv kev tshwm sim cov chaw tsis meej lossis cov pob ntawm peb hom lag luam feem ntau yog sib npaum li 0.02% los ntawm dej, uas yuav cuam tshuam thaum dej loj dua li qhov xav tau, lossis thaum cov khoom loj dua qhov tshwj xeej nyob hauv kev tsim kho. Peb tau pom tias, khiav mus rau cov rooj hlub ntoo uas muaj kev txiav txim siab zoo dua, yuav pab kho kom tsawg dua li 70-75% ntawm cov pob no, vim tias nws pab sib thooj ntau dua hauv qhov chaw ua zog. Txog cov caij nplooj ntsha uas tshwm sim tas li tas los no? Feem ntau nws tshwm sim los ntawm cov khoom nyob ntev dhau hauv qhov chaw ntxuav khoom uas muaj kub. Thaum xav tames siab tej problema no, cov neeg tsim khoom yuav tsum sau lub sijhawm uas khoom nyob hauv av, thiab tswj kom kev sov kub tsis txog 25 degrees Celsius ib sekund rau cov khoom uas muaj kev puas siab. Yog tias tuaj to taub tej qauv no, yuav pab tau ntau hauv kev tsim khoom zoo tsis muaj leej twg.

Cov Ntsiab Lus Hlwb: Splay, Qhov Sis Ntawv, thiab Kev Tswj Cov Khoom Tsieb

Splay (silver streaks) muaj los ntawm resin muaj kua nqaij lossis muaj qhov txias tshuab ntau dhau nyob rau hauv kev rov cuam ntau dua 120 mm/s. Yog khaws temperature ntawm nozzle down los li 8–12°C thiab xaiv 10µm hopper filters tuaj yeem kom splay ceev dua li 68%. Rau kev sib txawv hluv, cov duab tshiab polycarbonate-based purging compounds nyob saum qhov kho tshiab muaj feem cuam txwm zoo ib yam hauv ĨE<1.5 tolerance levels.

Cov kev tswj hwm tiv thaiv thiab cov khoom simulation rau kev tsim kho tsis muaj leej twg

Siv Mold Flow Analysis kom paub ntxoov ntxooj thiab tiv thaiv kev tsis zoo

Kev pab txuas nrog rau kev sim qhov chaw tso dej npog xwm fab xwm fab li Autodesk Mold Flow thiab SolidWorks Plastics txav rau kev saib seb dab tsi tuaj yeem pom hauv qab tsev nyob ib xyoo ua ntej tshwm sim kuv tshuab. Txhawm rau kev suav los ntawm Modern Machine Tools hais tias nyob ib xyoo 2023, muaj pej xeem tshaj li 8 hauv 10 tus neeg tsim khoom uas tau siv cov cuab yeej no tau pom tias lawv cov nqi tshuab hlau tau hloov mus ib thiaj tshiab dua li kev tsim kho tshaib tshaib. Cov programs no zoo nkauj rau kev nrhiav qhov teeb meem - nws tau nrhiav tau tshuab npog, tswb tsis tuaj, thiab cov av kab ruaj uas tuaj yeem tshwm sim. Nws ua li no los ntawm kev nrhiav qhov kub txias li 5 degrees Celsius (uas yog li 180 Fahrenheit). Piv txwv li cov khoom siv rau electronic housing components. Muaj kev sim raug, tus neeg tsim khoom tuaj yeem paub qhov twg yuav tso cov rooj kom tsis muaj dej ntsuag hauv kev tsim kho, uas pheej hmong thiab kom tsawg dej ntxha.

Daim duab Zoo Tshaj: Lub Qhov Roog Thaum Twg, Qhov Tswb Raug, thiab Qhov Tso Av

Kev txhim kho qhov thick (1–3mm zoo tshaj plaws rau ABS thiab PP) pab tiv thaiv kev ntxiav los ntawm kev hlawv tsis zoo. Txoj kab uas muaj roj sib thooj nylon, radial gates cuam tshuam 40% tso thaum ua ntej dhau los ntawm edge gates, raws li cov kaw lus no tshaj tawm los ntawm 2022 polymer flow studies. Cov lus qhia rau kev tsim kho yooj yim:

• Draft angles ≥1°C per side rau kev tshem tseg yooj yim
• Vent depths of 0.015–0.03mm rau kev tso siab tawm tsis muaj flash
• Rib-to-wall thickness ratios nyog hauv qab 60% kom tiv thaiv kev ntxiav

Kev sau cov kev tsim kho thiab kev daws teeb meem rau qhov zoo txaus siab

Kev sib txuas ntawm kev ntsuas siab nyob hauv yam ntxwv piv rau lawv meej kev tswj IoT pab tiv thaiv kev ntxuav siab txo qhov muaj cuab yeej, feem ntau hauv qhov 2% ib leeg. Qhov no muaj tseeb tshaj plaws thaum xav kom tso tseg cov shot tsis zoo hauv lub mold uas muaj ntau qhov. Rau kev saib xyuas theem thaj tsam, kev ntsuas txhua xyoo los ntawm profilometers tuaj yeem pom thaum lub surface ntawm lub mold tau ncav qog dhau li 5 micrometer, uas yog qhov feem ntau hu ua flash problem. Nrhiav cov ntaub ntawv los ntawm ib tug MMT study diav nrog 2023 kuj pom ib yam dab neeg. Lawv pom tias nyob rau hauv 8 ntawm 10 qhov tsis paub tuag tuag yog vim qhov screw check rings tau ncav qog. Qhov no tseem ceeb heev vim tias yuav tsum kho cov chav koom haum no txhua 3 xyoo kom kev lag luam tuaj yeem ncua ncaum.

stems los tso rau ib qhov kev flow yooj yim, muaj ntau nplooj hu ua laminar flow.