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:

Remember: Front tension helps the material move out, reducing roll load and shifting the neutral point towards the exit. Back tension does the opposite.

Answer 1

The Correct Option is B, C

Step 1: Understand the concept of front tension.
In rolling, *front tension* is a pulling force applied at the exit side of the strip. This reduces the effective roll pressure needed to deform the sheet. Step 2: Effect on neutral point.
- Neutral point = location where strip speed = roll surface speed.
- When front tension is applied, the strip is pulled more strongly from the exit side. This makes the forward slip region smaller.
- Therefore, the neutral point shifts towards the roll exit. Step 3: Effect on rolling load.
- Because the sheet is being pulled out by front tension, the rolls need to apply less pressure.
- Thus, rolling load is decreased. Step 4: Eliminate wrong options.
- (A) Neutral point shifts towards entrance → incorrect.
- (D) Rolling load increases → incorrect.
- Correct effects are: (B) and (C). \[ \boxed{\text{Correct Answer = (B) and (C)}} \]