Workshop Technology
The metal extrusion process is generally used for producing

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

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Workshop Technology
Piercing is an operation of cutting

A flat sheet to the desired shape
A hole (other than cylindrical) in a sheet of metal by the punch and the die
A number of holes evenly spaced in a regular pattern on a sheet of metal
A cylindrical hole in a sheet of metal by the punch and the die

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Workshop Technology
In a hot chamber die casting machine

Nonferrous alloys with high melting temperature are casted
Nonferrous alloys with low melting temperature are casted
Ferrous alloys with low melting temperature are casted
Ferrous alloys with high melting temperature are casted

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