liam.mccaffrey
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| posted on 6/9/09 at 11:27 PM |
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Casting question
just saw "how its made" and a street lighting company were making a sand core for an ali casting. The guy completely solidifies a
"white sand" core by blowing co2 through it, to aparently start a "chemical reaction"
anyone ever seen or done this? seemed amazing to me
special sand??
[Edited on 6/9/09 by liam.mccaffrey]
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Staple balls
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| posted on 6/9/09 at 11:48 PM |
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Bit of googlage says it's probably sand and Sodium Silicate
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richardlee237
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| posted on 7/9/09 at 06:25 AM |
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This technique has been around for more than 60 years.
The sand is mixed with a resin which is activated by the prescence of CO2. This makes a solid core which can be handled and laid in the mould. When
the mould is broken open the sand can easily crushed in a mill and re used.
The ability to build the core from a series of shaped blocks enables quite intricate castings to be made cheaply.
Quote Lord Kelvin
“Large increases in cost with questionable increases in performance can be tolerated only in race horses and women.”
Quote Richard Lee
"and cars"
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