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In forging pressure P and longitudinal stress (σx

) build up to a maximum value at the centre

of the plate(work), and reduce to a minimum value at the edge(end) of the plate. When this

variation in P & ( σx

) is plotted over the entire length, a peak exists at the centre,

resembling a "hill".

This plot is called as friction hill.

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Q: What is friction hill in forging?
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