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Questions and Answers
What is the main objective of metal forming?
What is the main objective of metal forming?
- To increase the yield strength of metal workpieces
- To reduce the ductility of metal workpieces
- To produce chips from metal workpieces
- To change the shape of metal workpieces using stresses beyond yield strength (correct)
How is plastic deformation different from elastic deformation?
How is plastic deformation different from elastic deformation?
- Elastic deformation is temperature dependent, while plastic deformation is not
- Plastic deformation results in a permanent change in shape, while elastic deformation does not (correct)
- Plastic deformation always leads to fracture, while elastic deformation does not
- Elastic deformation requires higher stress than plastic deformation
What must a metal possess for successful forming operation?
What must a metal possess for successful forming operation?
- High yield strength and low ductility
- Low yield strength and low ductility
- High yield strength and high brittleness
- Low yield strength and high ductility (correct)
What distinguishes shaping from forming?
What distinguishes shaping from forming?
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What is the ability to change the shape of metal in a solid state without deterioration of metal properties called?
What is the ability to change the shape of metal in a solid state without deterioration of metal properties called?
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Study Notes
Metal Forming
- The main objective of metal forming is to give a desired shape to a metal without changing its mass or composition.
Deformation Types
- Plastic deformation: permanent change in shape and size of a metal under stress, does not return to original shape after removal of stress.
- Elastic deformation: temporary change in shape and size of a metal under stress, returns to original shape after removal of stress.
Successful Forming Operation
- A metal must possess ductility, malleability, and sufficient strength for a successful forming operation.
Shaping vs. Forming
- Shaping: refers to the process of generating a specific shape or profile on a metal surface.
- Forming: refers to the process of changing the shape or size of a metal without breaking or cracking it.
Metal Properties
- The ability to change the shape of metal in a solid state without deterioration of metal properties is called formability.
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