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Questions and Answers
What is the primary purpose of rolling in metal forming?
What is the relationship between yield stress (S) and yield strength (Y) in strip and sheet shape sectional?
What is the condition in which the velocity of the workpiece is equal to the roller speed?
What is the formula to calculate forward slip (S) in rolling?
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What is the result of the rolling process on the grain structure of the metal?
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What is the term for the maximum amount of deformation that can be achieved in a single pass?
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What is the primary force that reduces the thickness of the work in rolling?
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What is the term for the velocity of the workpiece as it exits the rolls?
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Study Notes
Bulk Forming
- Rolling is a bulk deformation process that reduces the thickness of the workpiece by compressive force exerted by two opposite rolls.
Change in Grain Structure
- Rolling process results in a change in grain structure.
Fundamental Concepts of Metal Rolling
- Rolling is a fundamental process in metal forming.
Forces and Geometrical Relationships in Rolling
- The yield stress in strip and sheet shape sectional (plain strain) is given by S = 1.115Y, where Y is the yield stress.
Neutral Point and Forward Slip
- At the neutral point, the velocity of the workpiece is equal to the roller speed.
- In forward slip, the exiting speed is greater than the roller speed, and is calculated by S = Vf – Vr / Vr, where S is the forward slip, Vf is the exiting velocity of the workpiece, and Vr is the roller speed.
Maximum Reduction
- The maximum reduction in rolling is a critical concept in metal forming.
Key Points about Rolling
- Rolling is a significant process in metal forming with various applications and implications.
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Description
This quiz covers the basics of metal forming, including bulk deformation, rolling, and changes in grain structure. It's a great resource for students learning about metal forming processes.
