Workshop Technology
The purpose of a riser is to

Deliver molten metal into the mould cavity
Feed the molten metal to the casting in order to compensate for the shrinkage
Deliver the molten metal from pouring basin to gate
Act as a reservoir for the molten metal

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Workshop Technology
During hot working of metals

All of the listed here
Grain structure of the metal is refined
Mechanical properties are improved due to refinement of grains
Porosity of the metal is largely eliminated

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