Workshop Technology
Extrusion

Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
Consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part
Is used for reducing the diameter of round bars and tubes by rotating dies which open and close rapidly on the work
Is extensively used for making bolts and nuts

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

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Workshop Technology
Swab is used for

Moistening the sand around the edge before removing pattern
Reinforcement of sand in the top part of the moulding box
Smoothing and cleaning out depressions in the mould
Cleaning the moulding sand

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