30 Questions
What is the main difference between expendable mould casting and permanent mould casting?
Expendable moulds are destroyed to remove the casting, while permanent moulds are reused for multiple castings
What is the purpose of cores in sand casting?
To produce internal surfaces in castings
What is the typical composition of foundry sand used in sand casting?
90% silica, 3% water, 7% clay
What is a major requirement for patterns used in sand casting?
Patterns must be oversized to account for shrinkage and machining operations
What is the main purpose of chaplets in the context of cores in sand casting?
To support cores for more stable positioning
Which type of casting requires a new mould for each new casting?
Sand casting
Which casting process involves the use of a pattern made of wax?
Investment casting
What is a disadvantage of investment casting?
High cost
Which casting process is suitable for mass production of non-ferrous alloys and cast iron?
Permanent mold casting
In which type of die casting is the injection system submerged in the molten metal?
Hot-chamber die casting
Which casting process offers the advantage of good dimensional accuracy and finer grain structure?
Permanent mold casting
What is a key advantage of hot-chamber die-casting?
Ability to handle complex shapes
Which type of castings are produced in permanent mold casting?
Multiple castings
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
What is an advantage of investment casting over sand casting?
No need for skilled labor
What does hot-chamber die-casting involve?
Injecting molten metal under high pressure into a die
What is the function of chaplets in the context of cores in sand casting?
To provide stability and support for the cores
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
What is the primary purpose of investment casting?
To produce complex and detailed parts with high dimensional accuracy
What is the typical composition of foundry sand used in sand casting?
90% silica, 3% water, 7% clay
In which type of die casting is the injection system submerged in the molten metal?
Hot-chamber die casting
What is a key advantage of centrifugal casting over other casting methods?
Ability to produce hollow cylindrical parts with high density
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
What is a key advantage of permanent mold casting over sand casting?
Good dimensional accuracy and finer grain structure
What is a disadvantage of hot-chamber die-casting?
Limited to simple shapes
What is an advantage of cold-chamber die casting over hot-chamber die-casting?
Injection system not submerged in molten metal
What is the primary area of application for investment casting?
Mass production of complex parts such as art pieces, jewelry, dental fixtures
Which feature defines the surface quality of casting and the major mold parameters such as strength and permeability?
Grain size and grain shape
What is a common disadvantage of investment casting?
Very expensive process
What is a common advantage of investment casting over sand casting?
Minimal additional machining required
This quiz covers the topics of expendable mould casting (including sand casting and investment casting) and permanent mould casting (such as die casting and centrifugal casting). It also includes information on the production steps and patterns used in sand casting.
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