Question:
For given reduction and frictional conditions, if the diameter of rolls is increased, the rolling load
For given reduction and frictional conditions, if the diameter of rolls is increased, the rolling load
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Big Rolls = Big Contact Area = Big Load. This is why small-diameter work rolls (supported by backup rolls) are often preferred for heavy reductions.
Updated On: Jul 4, 2026
- Increases
- Decreases
- Unaffected
- Becomes zero
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The Correct Option is A
Solution and Explanation
Step 1: Concept Rolling load is the force applied by the rolls to the workpiece during deformation.
Step 2: Meaning The total rolling load is proportional to the contact area between the rolls and the metal.
Step 3: Analysis Increasing the roll diameter for the same reduction increases the length of the arc of contact.
Step 4: Conclusion A larger contact area results in a higher total rolling load and torque required for the operation. Final Answer: (A)
Step 2: Meaning The total rolling load is proportional to the contact area between the rolls and the metal.
Step 3: Analysis Increasing the roll diameter for the same reduction increases the length of the arc of contact.
Step 4: Conclusion A larger contact area results in a higher total rolling load and torque required for the operation. Final Answer: (A)
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