Discussion :: Workshop Technology
- The purpose of a riser is to
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A.
Deliver molten metal into the mould cavity |
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B.
Act as a reservoir for the molten metal |
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C.
Feed the molten metal to the casting in order to compensate for the shrinkage |
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D.
Deliver the molten metal from pouring basin to gate |
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Answer : Option C
Explanation :
A riser, also known as a feeder, is a reservoir built into a metal casting mold to prevent cavities due to shrinkage.
Most metals are less dense as a liquid than as a solid so castings shrink upon cooling, which can leave a void at the last point to solidify.
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