Posted by Wardner on July 14, 2011 at 11:23:38 from (209.86.226.57):
In Reply to: freeze plug on M posted by e-manhunt on July 14, 2011 at 09:23:17:
Freeze plugs aren't designed to relieve a casting from expanding ice pressure. Of course, they can do that but a severely frozen casting will have areas that distort anyway.
They are actually core holes where the cores penetrate to the exterior. The exterior portion of those cores rest in pockets that support and locate the core. Those pockets are called core prints and are preformed with the pattern.
A core is used to prevent metal from occupying the space where it is used. If you take something simple like a water outlet, you can see where the core goes. The core will have extensions that fit into a core print.
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