What is Gravity Casting and how is Gravity Casting Used
Learn about Casting Jewelry and the history of Casting
Jewelry
Research and development in gravity casting has taken an
important step in making metal products a part of our day to day lives. The
products used in homes, aircrafts, artifacts, automobiles have become more
durable and less expensive. Cast alloy parts are formed by melting the alloy
and then pouring it in a mold under heavy pressure or vacuum. Gravity casting
is also known as vacuum casting. It is a technique in which large diameter
filaments are used with adequate separation. This ensures that no clusters are
formed and also good metal wetting of the fiber is guaranteed. This technique
was first used in 1970. The gravity casting method has advantages like cost
effective, good quality, and process control over other casting techniques.
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Gravity casting is done in ceramic molds, sand, permanent
casting and also in investment or lost wax casting. The gravity casting process
was started with common steel after successful implementation it was further
tried on heat resistance super alloys. With recent development and with more
refined methods today even titanium alloys are being cast using the gravity
casting method and using ceramic crucibles. The use of desired mold designs and
also specially made unique designs enable a reduction in the metal cast to
yield the given part. This also helps in reducing the amount of energy that is
used in making such casting articles.
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With new developments, today even computerized control of
the vacuum pressure and rate is possible. This enables the user to control the
filling rate. This makes casting of high quality metals like and viscous metals
like metal matrix and composites of aluminum casting possible. This gravity
casting method is used to produce casting worth of more than $200 million. The
industry is expected to grow rapidly in the coming years due to the increase in
production of automotive exhaust manifolds in stainless steel.
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The first ever commercial use of this computerized
technology, was made by Howmet Industries of Whitehall, Michigan. They used
this technology to precisely cast and design turbine blades used in aircrafts.
This technology is also being used by Ford Motors to develop and improve the
casting process of light truck and automobile engine blocks.
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Today, metal parts fabricated using gravity casting method
is being used in 90 per ? cent of all durable goods. Goods like stoves, washing
machine, automobiles, refrigerators, lawn mowers, cars and even boats. Many
other articles like badminton rackets, tennis rackets, and even football studs
are made by using light weight metals which are gravity casting method. This
gravity casting method has been used to develop metal alloy parts, which are
used for the auto and airline industries, which is said to make vehicles
lighter though much stronger and extremely efficient.
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Alloys like ferric cast metals, casting grade iron and steel
are typical metals that are used for gravity casting. Also die cast grade zinc
can be cast using gravity casting method. Also other raw materials like sand, spin
or plaster are used. Aluminum is also used , but it is very difficult to gravity
cast aluminum a lot of care needs to be taken and proper pressure should be
applied to obtain the desired shape and effect.Â
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Tags: adequate separation, artifacts, automotive exhaust, cast alloy, ceramic molds, clusters, composites, exhaust manifolds, filaments, gravity casting, heat resistance, metal matrix, mold designs, new developments, quality metals, refined methods, research and development, titanium alloys, unique designs, vacuum pressure
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