CASTING

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CASTING

• Hassan Sarwar
• ME100
• 4M-10C
• Oct 18, 2005

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OBJECTIVE

• Objective of this presentation is to give an
  introduction on the process of casting, which is
  widely used in mechanical engineering.

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WHAT IS CASTING?

• It is a process in which a hot liquid material is
  introduced into a mold of a specific shape.
• After it cools down, it forms the specific shape
  of the mold.

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Where is it used?

• This process is used to produce a fabricated
  object, a part, or casing.
• It is widely used in automobile manufacture
  industry, such as the casting of engine blocks or
  cylinder heads.
• It is also used to form various types of liquids,
  meltable plastics and materials.

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Four elements of Casting

• There are four elements of casting
• Pattern
• It is the original template from which the
  mould is prepared.
• Mold
• It is the place with a specific shape, where
  we put our liquid metal to duplicate the shape of
  mould.

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Four Elements of Casting Continued

• Cores
• Cores are basically used to produce
  tunnels and holes in our shape.
• Part
• The part is the final product of this
  process.

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CASTING WITH RESPECT TO DIFFERENTIAL

• What is differential?
• Differential is a device which consists of gears
  in a car, and it proves equally torque to the
  driving wheels.

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How is it related to casting?
Fig
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How is it related to casting? Continued

• In this picture, you can see it is consisted of
  different type of components.
• The casting here is used to create the component
  of this differential.
• They took a material in liquid form, and put it
  into a mold, which eventually looks like this
  component.
• Thus, when the liquid is solid, it forms this
  shape.

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TYPES OF CASTING

• There are many different types of casting.
• However, I am only going to talk about few types
  of casting used in manufacturing because of the
  time limit.

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SAND CASTING

• In sand casting, sand is the main source for the
  casting.
• It is fast and requires only few days to dry. It
  is the oldest yet the best technique of
• casting.
• It is usually used for processing low-temperature
  steel and aluminium, magnesium and nickel alloys.
  

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PLASTER CASTING

• In plastic casting, plaster is used for casting.
• It requires less than a week to prepare.
• The plaster compound usually consists of 70-80
  of gypsum and 20-30 strengthener and water.
• It is used to prepare metals such as Al, Zn or
  copper based alloys.

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SHELL MOLDING

• In this type of casting, a mixture of sand and
  3-6 resin holds the grains together.
• This type of casting takes weeks to get ready.
• It is usually used to create objects from
  aluminium and magnesium.

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SOURCES

• http//en.wikipedia.org/wiki/Casting