What is investment casting also known as?
Analysis & Theory
Investment casting is also called lost wax casting because the wax pattern is melted and lost during the process.
Which material is commonly used to create patterns in investment casting?
Analysis & Theory
Wax is commonly used to make patterns in investment casting due to its ability to melt and burn out easily.
What is the binder used in the CO₂ process?
Analysis & Theory
The CO₂ process uses sodium silicate as a binder, which hardens upon reaction with carbon dioxide gas.
What is the purpose of blowing CO₂ gas in the CO₂ process?
C
To harden the sand mold
Analysis & Theory
CO₂ gas reacts with sodium silicate to form a hard, rigid mold.
Which of the following is a major advantage of investment casting?
B
Low dimensional accuracy
D
Excellent surface finish and accuracy
Analysis & Theory
Investment casting provides high dimensional accuracy and smooth surface finish.
What are cores used for in casting?
B
To create hollow sections inside castings
C
To cool the metal faster
Analysis & Theory
Cores are used to form internal cavities or hollow sections in cast components.
Which of the following materials is commonly used for making cores?
Analysis & Theory
Cores are typically made from dry sand mixed with a binder for strength and easy removal.
What is a drawback of the CO₂ process?
B
Produces rough surface finish
Analysis & Theory
A drawback of the CO₂ process is the potential for increased porosity in the mold.
Why is wax melted out in investment casting?
C
To create a cavity for molten metal
Analysis & Theory
Melting the wax leaves a cavity that will be filled with molten metal.
Which process is most suitable for complex and intricate metal parts?
Analysis & Theory
Investment casting is ideal for producing complex and detailed metal components.