Rapid Prototyping - Sla Fdm

In: Computers and Technology

Submitted By imontheoutside
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Sprawozdanie

Ćwiczenia laboratoryjne – zapoznanie się z maszynami do szybkiego prototypowania metodą SLA oraz FDM

Prowadzący:
Mgr inż. Michał Haraburda

Stereolitografia (SLA - Stereolitography)

Opis Opracowana przez firmę 3D Systems technologia polegająca na polimeryzacji płynnej żywicy wiązką lasera. Utwardzenie płynnej żywicy jest możliwe dzięki dodaniu fotoinicjatora, który powoduje w miejscu naświetlenia (w tym przypadku fotonami w skierowanej wiązce laserowej) rozpoczęcie procesu polimeryzacji (łączenia się merów w łańcuchy merowe) w ściśle określonej objętości. Grubość uzyskanej warstwy zawiera się w przedziale 0,05-0,3 mm. W urządzeniach stosowane są lasery o mocy nawet 200 mW. Dokładność urządzeń stereolitograficznych wynosi ok. ± 0,1 mm. Do wytwarzania tą metodą stosuje się żywice akrylowe lub epoksydowe, np. Accura 10 – Żywica standardowa, Accura 48HTR – przeznaczona do gotowych wyrobów, Accura Amethyst - przeznaczona do precyzyjnych modeli

Maszyna[1]

Maszyną do wytwarzania modeli techniką SLA, którą poznaliśmy na zajęciach było urządzenie firmy 3D Systems SLA 250/30. Pozwala ona na budowę modeli w temperaturze pokojowej. Urządzenie to zbudowane jest z czterech podstawowych modułów (oznaczonych na rys. 1):
[pic]
Rysunek 1: Maszyna SLA250/30. 1 – laser, 2 – układ optyczny, 3 – przestrzeń robocza, 4 – zestaw kontrolny z komputerem

1. Lasera Laser jonowy He-Cd (helowo-kadmowy) emitujący wiązkę w zakresie promieniowania ultrafioletowego o długości fali λ=325 nm (nadfiolet) i mocy od 2 do 40 mW. Średnicą wiązki padającej na płynną żywicę = ok. 0,125 mm (zależnie od indywidualnego wykonania każdego lasera).

2. Układu optycznego Układ optyczny maszyny SLA250/30 składa się ze zwierciadeł, których zadaniem jest zwiększenie skupienia promienia lasera oraz skierowania go do przestrzeni roboczej maszyny. Na układ…...

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