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Manufacturing:
Metal Casting
Metal
Casting Techniques - Squeeze Casting
Squeeze Casting combines
the processes and advantages of Gravity
Casting and Forging. Squeeze Casting uses
metal permanent molds and it has a material
tank. The pouring process uses a cylinder
at the bottom of the material tank to push
the material into molds. This pouring process
is similar as Gravity Casting, but Gravity
Casting uses gravity instead of a cylinder
to load the mold.
After material goes into
the mold, the cylinder of the material tank
continues loading pressure, about 300 tons,
until the end of the casting cycle. When
the material in the mold starts to cool
down, it will begin to shrink. The cylinder
will continue the loading pressure to push
more metal into the mold, making the casting
more solid and with greater detail. This
makes the process similar to Forging. The
casting quality of Squeeze Casting is close
to Forging.
Process
Liquid metal is introduced
into an open die, just as in a closed die
forging process. The dies are then closed.
During the final stages of closure, the
liquid is displaced into the further parts
of the die. No great fluidity requirements
are demanded of the liquid, since the displacements
are small. Thus forging alloys, which generally
have poor fluidities which normally precludes
the casting route, can be cast by this process
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