Workshop Technology
The metal extrusion process is generally used for producing

Uniform solid sections
Uniform solid and hollow sections
Uniform hollow sections
Varying solid and hollow sections

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Workshop Technology
The purpose of a riser is to

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

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