I get that the ingots need a certain draft angle in order to easily eject from the die, but why is the angle usually so extreme? The ingots are, from what i believe, just used for easy storage of metal, but why wouldn’t a lesser angle then be favorable, as the packing of the ingots would be more efficient?
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It’s the draft angle for the casting. You make the hole you’re later going to pour metal into by pressing an ingot-shaped piece of wood or steel into specially-formulated sand. When you pull it out, you don’t want the sides to stick to it or collapse into the ingot-well. If they do, you have to do the whole step over again.
Having a generous draft angle ensures that the casting process goes smoothly, and densely packing the ingots for storage is a non-issue. Even a loosely piled stack of aluminum (read: lightweight for metals) is so heavy that you have to think carefully about whether the floor can support its weight.
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