Marshall
The thermal mass of a molten particle is small. You can actually spray it
onto wax if you know what your doing and consequently a cross linked polymer
(e.g. SLA) is no problem. The trick is really three fold. Firstly you must
not overheat / burn the part, secondly you must get the material to adhere
to the part (and preferably select the time for the two to separate), and
thirdly you must prevent/control the residual stress build up that occurs
upon cooling of the superheated metal. For this reason low melting point
materials such as Zinc are relatively simple to spray, while higher
performance materials (i.e. steel) are more difficult but can produce
extremely robust tools.
Regards
Ben (Halford)
Consultant
PERA Technology
England
0044 (0)1664 501501 ext. 516
ben.halford@pera.com
www.pera.com
> -----Original Message-----
> From: Marshall Burns [SMTP:Marshall@Ennex.com]
> Sent: 22 November 1999 19:11
> To: RP-ml@bart.lpt.fi
> Subject: Physics of spray metal tooling
>
> Good morning,
>
> Does anyone here know the physics or the metallurgical theory behind
> spray metal tooling? I'm interested in understanding how a powder metal
> spray can be applied to a plastic surface and form a dense solid without
> melting or burning the plastic. Your insights will be appreciated.
>
> Thank you.
>
> Best regards,
> Marshall Burns
> President, Ennex Corporation
>
> Marshall@Ennex.com
> Los Angeles, USA, (310) 824-8700
> www.Ennex.com
>
>
>
> 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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