Workshop Technology
Green sand is a mixture of

90% sand and 10% clay
30% sand and 70% clay
70% sand and 30% clay
50% sand and 50% clay

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Workshop Technology
Extrusion

Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
Is extensively used for making bolts and nuts
Is used for reducing the diameter of round bars and tubes by rotating dies which open and close rapidly on the work
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

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