Re: SLS part bed temperature

From: Toby Gill (T.J.Gill@liverpool.ac.uk)
Date: Wed Apr 30 2003 - 12:34:17 EEST


Gui Wee Siong

During laser scanning the bed temperature will rise though a 30 degrees
increase seems a little high.
There are a few suggestions i can think of that may be of help.

1.In the build profile editor on the Sinterstation 2000 it is possible to
set the temperature according to the build height and I presume this is the
case for the 2500. You could possibly lower the bed temperature after the
first few layers to reduce the risk of exceeding your melt temperature.

2. Check that downdraft is switched on as this will help to keep a constant
bed temperature during the processing.

3. Ensure there is sufficient spacing between parts or orientate parts so
that the layer is not covered by a solid mass. This will allow heat to
dissipate through the bed and reduce the temperature rise.

4. It may also be possible to increase the time between successive scans
and/or layers allowing the bed to return to the set temperature.

regards

Toby

--On 30 April 2003 16:35 +0800 #GUI WEE SIONG#
<weesiong_gui@pmail.ntu.edu.sg> wrote:

> I am presently doing test sintering on polycaprolactone (PCL) on the SLS
> machine Sinterstation 2500. I am working at ambient temperatures of 30ºC.
> I noticed that the actual part bed temperature rises to more than 60ºC
> after some time, although I set the part bed temperature at 30ºC. As PCL
> has a melting point of 60ºC, the samples melted.
> Is there any way we can control the temperature at around 30ºC or
> possibly switch off the heater of the SLS machine? Please advise.
> Thank you
>



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