CASTINGCASTING

Hassan SarwarHassan SarwarME1004M-10COct 18, 2005

OBJECTIVE:OBJECTIVE: Objective of this presentation

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

WHAT IS CASTING?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.

Where is it used?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.

Four elements of Four elements of Casting: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.

Four Elements of Casting Four Elements of Casting ContinuedContinued

Cores: Cores are basically used to

produce tunnels and holes in our shape.

Part: The part is the final product

of this process.

CASTING WITH RESPECT CASTING WITH RESPECT TO DIFFERENTIALTO DIFFERENTIAL

What is differential?

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

How is it related to How is it related to casting?casting?

Fig: Fig:

How is it related to How is it related to casting? casting? ContinuedContinued

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.

TYPES OF CASTINGTYPES 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.

SAND CASTING: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.

PLASTER CASTING: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.

SHELL MOLDING: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.

SOURCESSOURCES http://en.wikipedia.org/wiki/

Casting