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Put these extrusion states in order, from first to last

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Slight fall in load as billet starts to move relative to walls

Residual billet becomes small compared with die, radial forces due to friction dominate

Coining of billet transforms locally to fill container, minor bulge occurs

End of steady-state phase

Punch starts to plastically deform the billet

Elastic straining of billet and tooling

Fall in friction force as length of wall contact reduces


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