re: Injection Mold Tool Backfill

From: bvanhiel@nordson.com
Date: Thu Jul 24 1997 - 18:32:40 EEST


Jeff,

Quickcast is not the best way to create an injection mold. Instead model
the mold as a thin shell (~.050" thick) rather than a solid and leave the
back of the mold open. Create some internal ribs to help support the thin
shell. Then backfill using an aluminum-filled epoxy. Leave some extra
length on the back so that you can mill the mold insert to the correct
thickness after the epoxy hardens. Then fit the insert into the mold and
shoot parts!

You may be able to find some additional information at the RPMI webpage at
www.rpmi.marc.gatech.edu

I haven't checked the page in a while so I'm not sure what changes they've
made, but I'm sure there is a description of the process somewhere.

-Brian
-------------
Original Text
>From "Dark, Jeffrey T" <Jeff.Dark@PSS.Boeing.com>, on 7/23/97 1:19 PM:
Hulloooo out there!

Who has experience backfilling large QC patterns (18 x18 x 3/4) with
a compatible material? My purpose is to save time on machines while
providing a strong enough model for injection molding.

What is that material?

What equipment is needed?

What procedure is used?

What pitfalls are there to be avoided?

Come on, I know you're out there!
Thanks, Muchas Gracias, Merci, Grazia, Dahnke, etc.

Jeff Dark
Technical Focal
BCAG Rapid Prototyping Center
Boeing Company
(206) 655-4366 PH
(206) 655-0934 FAX
Jeff.Dark@PSS.Boeing.com

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