aluminum extrusion
TRANSCRIPT
Aluminum extrusion is extensively used in construction, aircraft and automobile manufacture, consumer
goods and industrial machinery.
Extrusion is the process of shaping metals like aluminum, by forcing it to surge through a formed
opening in a die. Extruded material emerges as an expanded piece with the comparable profile as the
die opening. Through extrusion, very compound cross-sections can be shaped with outstanding strength
and finish.
The extrusion process
The extrusion process itself is like the old Play-Doh Shape Maker. When you clutch the Play-Doh through
the press, the out coming flow takes the shape of the chosen mold. Likewise, the extruded aluminum
takes the form of the opening of the die. By using strong hydraulic presses competent of exerting up to
15,000 tons of pressure, aluminum can be extruded into any shape.
There are two main methods of aluminum extrusion. Lets us know about this:
Direct extrusion
Direct extrusion is the most significant and prevalent method used in aluminum extrusion. In direct
extrusion, the die head is seized stationary and the aluminum billet is enforced through the die using a
stirring ram.
Direct extrusion is mostly used in the manufacture of solid rods, bars, and hollow tubes. The design of
the die can be modified to produce a wide variety of solid and hollow profiles.
Indirect extrusion
In direct extrusion, it is the billet that budges. In indirect extrusion, the aluminum billet is held stationary
and the ram shifts the die to apply pressure in the stationary billet.
The major stages in aluminum extrusion
The process of aluminum extrusion consists of these following phases:
1. A die is cast from the sample of the preferred shape.
2. Aluminum billets are heated in a furnace until 750-925ºF. At this end, the aluminum becomes soft.
3. Lubrication, known as smut, is applied to the ram and billet. The smut is necessary as it makes certain
the billet and ram do not stick collectively.
4. The ram applies force to the billet, pushing it through the die. During this course, liquid nitrogen is used
to chill the die. The cooling prevents the formations of unwanted oxides, as well as prolonging the
length of the die.
5. The extruded aluminum appears from the die, taking on the same shape like the die opening. The
extrusion is dragged onto a cooling table where it is exposed to water, air or a mixture of the two.
6. Next a stretcher is used. This accurate any twisting that may have occurred and unbend the metal.
Hardness and vigor are improved during the stretching process.
7. The extrusions, which may be 50 meters long are fed to a saw conveyor and cut to the requisite profiles
using a circular saw.
8. Lastly, the ended profiles are taken to be finished or fabricated, ready to be dispatched to the customer.
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