Group 9 Presentation. Sheet-Metal Forming Processes. Scott Currie Jared Adams Taylor Grisham Yien- Sheng Ao Joe Butner. Extrusion and Drawing of Metals. Definitions.
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Extrusion is defined as the process of shaping material, such as aluminum, by forcing it to flow through a shaped opening in a die. Extruded material emerges as an elongated piece with the same profile as the die opening.
This process of drawing is not to be confused with the drawing process related to the forming of sheet metals
Photos showing a new length of extrudate, just emerging from the press (left) and the production of a profile in progress (right).
The force required for extrusion depends on:
The geometric variables in extrusion are:
Flow through a die
F = 0.7TL(UTS)
Beyond yield strength but below the ultimate tensile strength
Placed on die and bent using a simple punch.
* Internal filling is sometimes necessary to prevent collapse.
Bulging- tubular expansion
Beading- sheet metal bent into cavity
Microcracks can lead to cracks and distortion as a blank is shaped
Machine for making blanks
Serope Kalpakjian, Steven R. Schmid
Prentice-Hall, Fifth Edition