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WorksheetsExploring Metal-Casting Processes
Total questions: 15
Worksheet time: 8mins
What is metal casting?
A process of recycling old metal into new forms.
A technique for welding metal pieces together.
A method of shaping metal using high temperatures without molds.
Metal casting is a manufacturing process that involves pouring molten metal into a mold to create objects.
Name three common metal casting processes.
sand casting, investment casting, die casting
welding
plastic molding
forging
What is the main purpose of a mold in casting?
To shape molten material into a specific form.
To mix different materials before casting.
To store the finished product after casting.
To cool down the molten material quickly.
Describe the difference between sand casting and investment casting.
Sand casting is more expensive than investment casting; investment casting is used for large structures.
Sand casting is for larger, less detailed parts; investment casting is for high precision and intricate designs.
Sand casting is a method for creating glass products; investment casting is for metal parts.
Sand casting is used for jewelry making; investment casting is for construction materials.
What materials are typically used for making molds?
Concrete, fabric, leather, foam
Stone, clay, vinyl, carbon fiber
Wood, glass, paper, rubber
Metals, plastics, silicone, ceramics
Explain the term 'pouring temperature' in metal casting.
The temperature at which metal solidifies in the mold.
The temperature of the mold before pouring the metal.
The temperature at which metal is cooled after casting.
The temperature at which molten metal is poured into a mold during casting.
What is the role of a riser in a casting process?
The role of a riser in a casting process is to supply additional molten metal to compensate for shrinkage during solidification.
To shape the final product after solidification.
To cool the molten metal quickly.
To provide a mold for the casting process.
How does the cooling rate affect the properties of the cast metal?
The cooling rate influences the microstructure, hardness, and ductility of cast metal.
Cooling rate only affects the color of the cast metal.
A slower cooling rate always increases brittleness.
The cooling rate has no effect on the metal's properties.
What are the advantages of using die casting?
Limited design flexibility
Poor surface finish
Low production rates
Advantages of using die casting include high production rates, excellent dimensional accuracy, ability to produce complex shapes, smooth surface finish, and cost-effectiveness for large runs.
What is the significance of gating systems in casting?
Gating systems control the flow of molten metal, reduce defects, and ensure uniform filling of molds in casting.
Gating systems are used to cool the metal after casting.
Gating systems are primarily for aesthetic purposes in casting.
Gating systems are only necessary for large-scale industrial casting.
Describe the process of lost-wax casting.
A method of creating sculptures by carving directly into stone.
A process where metal is shaped by hammering it into a mold.
A technique that involves pouring wax into a mold and letting it harden.
Lost-wax casting is a process where a wax model is coated to form a mold, the wax is melted away, and molten metal is poured into the cavity to create a cast object.
What are some common defects found in castings?
Shrinkage cavities, gas porosity, cold shuts, inclusions.
Dimensional inaccuracies
Color variations
Surface scratches
How can the quality of a casting be tested?
Thermal conductivity measurement
Color matching with a reference sample
Visual inspection, dimensional measurement, non-destructive testing, and mechanical property testing.
Chemical analysis of the mold material
What is the difference between ferrous and non-ferrous casting?
Ferrous casting contains iron; non-ferrous casting does not.
Ferrous casting is used for electrical applications, while non-ferrous is not.
Non-ferrous casting contains iron; ferrous casting does not.
Ferrous casting is lighter than non-ferrous casting.
Explain the concept of 'shrinkage' in metal casting.
Shrinkage refers to the increase in volume of metal as it heats up.
Shrinkage is the process of adding more metal to a mold during casting.
Shrinkage occurs only in non-ferrous metals during casting.
Shrinkage is the reduction in volume of metal as it cools and solidifies during casting.
