Foundry Technology Lecture 6: Expendable and Permanent Mould Casting

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What is the main difference between expendable mould casting and permanent mould casting?

Expendable moulds are only used for small castings, while permanent moulds are used for large castings

Expendable moulds require more complex patterns, while permanent moulds use simple patterns

Expendable moulds are made of sand, while permanent moulds are made of metal

Expendable moulds are destroyed to remove the casting, while permanent moulds are reused for multiple castings (correct)

What is the purpose of cores in sand casting?

To produce internal surfaces in castings (correct)

To support the chaplets for stable positioning

To provide enough metal for subsequent machining operations

To help in the cooling and solidification of the casting

What is the typical composition of foundry sand used in sand casting?

95% silica, 2% water, 3% clay

80% silica, 10% water, 10% clay

85% silica, 5% water, 10% clay

90% silica, 3% water, 7% clay (correct)

What is a major requirement for patterns used in sand casting?

Patterns must be oversized to account for shrinkage and machining operations Signup and view all the answers

What is the main purpose of chaplets in the context of cores in sand casting?

To support cores for more stable positioning Signup and view all the answers

Which type of casting requires a new mould for each new casting?

Sand casting Signup and view all the answers

Which casting process involves the use of a pattern made of wax?

Investment casting Signup and view all the answers

What is a disadvantage of investment casting?

High cost Signup and view all the answers

Which casting process is suitable for mass production of non-ferrous alloys and cast iron?

Permanent mold casting Signup and view all the answers

In which type of die casting is the injection system submerged in the molten metal?

Hot-chamber die casting Signup and view all the answers

Which casting process offers the advantage of good dimensional accuracy and finer grain structure?

Permanent mold casting Signup and view all the answers

What is a key advantage of hot-chamber die-casting?

Ability to handle complex shapes Signup and view all the answers

Which type of castings are produced in permanent mold casting?

Multiple castings Signup and view all the answers

What is the primary role of grain size and shape in casting?

Determining the surface quality of the casting and major mold parameters such as strength and permeability Signup and view all the answers

What is an advantage of investment casting over sand casting?

No need for skilled labor Signup and view all the answers

What does hot-chamber die-casting involve?

Injecting molten metal under high pressure into a die Signup and view all the answers

What is the function of chaplets in the context of cores in sand casting?

To provide stability and support for the cores Signup and view all the answers

What is a major limitation of sand casting in terms of pattern and mould cavity size?

Patterns and mould cavity must be oversized to account for shrinkage and machining Signup and view all the answers

What is the primary purpose of investment casting?

To produce complex and detailed parts with high dimensional accuracy Signup and view all the answers

What is the typical composition of foundry sand used in sand casting?

90% silica, 3% water, 7% clay Signup and view all the answers

In which type of die casting is the injection system submerged in the molten metal?

Hot-chamber die casting Signup and view all the answers

What is a key advantage of centrifugal casting over other casting methods?

Ability to produce hollow cylindrical parts with high density Signup and view all the answers

In investment casting, what is the main purpose of preheating the mold to a high temperature?

To eliminate contaminants from the mold and facilitate easier flow of liquid metal into the detailed cavity Signup and view all the answers

What is a key advantage of permanent mold casting over sand casting?

Good dimensional accuracy and finer grain structure Signup and view all the answers

What is a disadvantage of hot-chamber die-casting?

Limited to simple shapes Signup and view all the answers

What is an advantage of cold-chamber die casting over hot-chamber die-casting?

Injection system not submerged in molten metal Signup and view all the answers

What is the primary area of application for investment casting?

Mass production of complex parts such as art pieces, jewelry, dental fixtures Signup and view all the answers

Foundry Technology Lecture 6: Expendable and Permanent Mould Casting

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Questions and Answers

What is the main difference between expendable mould casting and permanent mould casting?

What is the purpose of cores in sand casting?

What is the typical composition of foundry sand used in sand casting?

What is a major requirement for patterns used in sand casting?

What is the main purpose of chaplets in the context of cores in sand casting?

Which type of casting requires a new mould for each new casting?

Which casting process involves the use of a pattern made of wax?

What is a disadvantage of investment casting?

Which casting process is suitable for mass production of non-ferrous alloys and cast iron?

In which type of die casting is the injection system submerged in the molten metal?

Which casting process offers the advantage of good dimensional accuracy and finer grain structure?

What is a key advantage of hot-chamber die-casting?

Which type of castings are produced in permanent mold casting?

What is the primary role of grain size and shape in casting?

What is an advantage of investment casting over sand casting?

What does hot-chamber die-casting involve?

What is the function of chaplets in the context of cores in sand casting?

What is a major limitation of sand casting in terms of pattern and mould cavity size?

What is the primary purpose of investment casting?

What is the typical composition of foundry sand used in sand casting?

In which type of die casting is the injection system submerged in the molten metal?

What is a key advantage of centrifugal casting over other casting methods?

In investment casting, what is the main purpose of preheating the mold to a high temperature?

What is a key advantage of permanent mold casting over sand casting?

What is a disadvantage of hot-chamber die-casting?

What is an advantage of cold-chamber die casting over hot-chamber die-casting?

What is the primary area of application for investment casting?

Which feature defines the surface quality of casting and the major mold parameters such as strength and permeability?

What is a common disadvantage of investment casting?

What is a common advantage of investment casting over sand casting?

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