Metal Extrusions and Roll Forming

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Metal ExtrusionsandRoll Forming

• Chapters 3.1 and 3.11

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http//www.world-aluminium.org/AboutAluminium/Pro
duction/Processing/Extrusion
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http//www.aec.org/techinfo/expro.html
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http//www.aec.org/techinfo/expro.html
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Videos
Pacific Bearing introduction to Extrusion
http//www.youtube.com/watch?viiGlq7408MEfeature
player_embedded
Impact Extrusion
http//www.youtube.com/watch?v9mQ2ic-kDlkfeature
related
Spanish Extrusion Company
http//www.youtube.com/watch?v9HpV483vJq8feature
related
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www.aluminumextrusions.com/ extrusions/
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http//www.engineersedge.com/extrusion.htm
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http//www.alexandriaextrusion.com/media/pdf/techn
ical_guides/6_4.pdf
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http//www.aec.org/techinfo/dies.html
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It is also possible to produce hollow sections
using extrusion. In this case, the die contains a
short piece (or mandrel) in the shape of the
hole. This mandrel is attached to the die by one
or more bridges. As the extruded material
encounters the bridges it is forced to separate,
but it flows around the bridges and joins up
again, much the same as water flowing around the
piers of a bridge. Figure 30 shows such a bridge
die. This works successfully even for processing
of solid metals.
Figure 30
http//openlearn.open.ac.uk/mod/resource/view.php?
id198368
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http//img.directindustry.com/images_di/photo-g/pr
ofile-extrusion-die-163472.jpg
http//www.aluminiumdesign.net/die-design.html
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Bralla
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Roll Forming
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www.poscoauto.co.kr/.../rnd/rnd_process_d04.jsp
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http//www.custompartnet.com/wu/sheet-metal-formin
g
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http//www.iai.dk/Default.asp?ID120
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Videos
Steel Forming Systems overview of their Roll
Forming process
http//www.youtube.com/watch?v44XD5mZoM_0feature
related
Quick Animation
http//www.youtube.com/watch?vik2FfI_vEUENR1
SME description of bow twist, etc http//www.youtu
be.com/watch?vxGLHjyPdDBINR1
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www.roll-forming.com/ simply.htm
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http//www.bikudo.com/product_search/details/46545
/roll_forming_machine.html
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Material straightness is another tolerance
consideration. Factors that establish material
straightness include camber, curve or sweep,
bow, and twist. The terms camber, curve, and bow
are many times interchanged when describing
material straightness, but they actually have
slightly different meanings. A formed part's
horizontal and vertical planes are determined by
their position in the roll forming
process. Material straightness terms
include Camber Camber is the variation of a
side edge from a straight line. Extreme camber
contributes to curve, bow, and/or twist in the
finished part. Curve or Sweep Curve or sweep is
the variation from a straight line in the
horizontal plane measured after the part has
been roll formed. Causes of curve or sweep
included incorrect horizontal roll alignment and
uneven forming pressure. Bow Bow is the
variation from a straight line in the vertical
plane. It can be either cross bow or
longitudinal bow. Bow is often caused by the
existence of irregular vertical spaces on
symmetrical sections and from uneven forming
areas on unsymmetrical sections. could use an
illustration here! Twist A formed part is said
to have twist when it resembles a corkscrew
effect. This is often caused by excessive
forming pressure in the final formed part. For
most roll forming operations, twist is typically
less than 5 in 10 feet of formed parts.
http//www.corrugated-metals.com/rollforming3.html
tolerance
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www.commercialroll.com/crf/roll_forming.htm
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