Question

Front tension is applied during cold rolling of a thin metal sheet. Which of the following statements is/are TRUE?

• A. The neutral point shifts towards the roll entrance.
• B. The rolling load is decreased.
• C. The neutral point shifts towards the roll exit.
• D. The rolling load is increased.

Hint:

Applying front tension during cold rolling reduces the rolling load and shifts the neutral point towards the roll entrance. These effects are crucial for optimizing the rolling process.

Answer 1

The Correct Option is A, B

When front tension is applied during cold rolling, the following effects occur: - Neutral point shifting: The neutral point (the point where the metal sheet does not experience any stretching or compression) typically shifts towards the roll entrance when front tension is applied. This is because the material entering the rolls is being pulled in by the tension, which changes the distribution of stresses. 
- Rolling load: The application of front tension reduces the overall resistance to deformation as the material is being pulled, which results in a decrease in the rolling load. 
Thus, Option A and Option B are correct. 
Step 1: Analyzing each option - Option (A): The neutral point shifts towards the roll entrance. - Correct: As described, front tension causes the neutral point to shift towards the entrance of the rolls. 
- Option (B): The rolling load is decreased. - Correct: The front tension reduces the resistance to deformation, resulting in a decrease in rolling load. 
- Option (C): The neutral point shifts towards the roll exit. - Incorrect: This would typically occur if no front tension was applied, or if a different type of tension was used. 
- Option (D): The rolling load is increased. - Incorrect: The rolling load is decreased, not increased, when front tension is applied. 
Step 2: Conclusion The correct answers are Option A and Option B.