Ch15 Metal Extrusion And Drawing Processes
Ch15 Metal Extrusion And Drawing Processes
Ch15 Metal Extrusion And Drawing Processes
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<strong>Extrusion</strong><br />
Defects<br />
continued<br />
Pipe (aka pipe pipe defect, defect, tailpipe, tailpipe, fishtailing) fishtailing<br />
<strong>Metal</strong> <strong>Metal</strong>-flow flow pattern in (c) tends to draw surface<br />
oxides and impurities toward the centre of the billet<br />
Can be minimized<br />
By modifying flow pattern to be more uniform<br />
Control friction<br />
Minimize temperature gradients<br />
Improve billet billet surface surface by by machining machining or or etching etching to to remove<br />
remove<br />
scale & surface impurities prior to extrusion
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