Tine + Jan,
Hello there, hope you are both well.
I will just add to some other responses regarding the low thermal
conductivity of epoxy and its effects (or rather, lack of effects!) on
cooling. We performed FEA heat transfer work showing that cooling channels
needed to be REALLY close (around 1mm) to the tool surface to have any
effect with epoxy tools. Generally it is not worth using conformal cooling
channels in these tools.
All geometries are different but generally I would recommend increasing tool
life by early ejection and then cooling the tool with compressed air so that
it will resist injection pressures with the next shot. You may also wish to
open the tool and cool the part as it sits on the core before then applying
the ejector pins.
Hope this helps,
Neil
> -----Original Message-----
> From: owner-rp-ml@bart.lpt.fi [mailto:owner-rp-ml@bart.lpt.fi]On Behalf
> Of Andrzejewski, Jan
> Sent: 01 November 1999 13:34
> To: 'rp-ml'
> Subject: re: Cooling channels in direct AIM tools
>
>
> Tine Hejslet Jørgensen
> Danish Technological Institute
> wrote:
>
> I am searching for some information on cooling channels in direct
> AIM tools:
> 1) Can I use water cooling or is the humidity resistant of the
> stereolithograpy tool to poor?
> 2) Do I need to use a special resin with better humidity
> resistant like 5530
> from Ciba?
> 3) Has anybody done calculations on how close to the part cooling channels
> can be situated without damaging the mould with a certain injection
> pressure?
>
> Ans 1 We would be pleased to quote you for a direct AIM tool in RPC 300ND
> resin, this resin is moisture resistant and high temperature approx 120
> degree C
>
> Ans 2 Yes, we found 5530 had the same humidity resistance as 300ND when we
> conducted plating trials.
>
> Ans 3 We have not yet looked at this yet! do you want to conduct
> collaborative trials?
>
> Jan Andrzejewski jan.rp@pera.com
> PERA
> Technology Centre
> Nottingham Road
> Melton Mowbray
> Leicestershire
> LE13 0PB
> UK
> Tel +44 (0) 1664 501501 Fax +44 (0) 1664 501556
>
>
> For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
>
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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