Mechanical Engineering - Workshop Technology - Discussion

48. 

In a four high rolling mill, there are four rolls out of which

[A]. one is working roll and three are backing up rolls
[B]. two are working rolls and two are backing up rolls
[C]. three are working rolls and one is backing up roll
[D]. all of the four are working rolls

Answer: Option B

Explanation:

No answer description available for this question.

Sohel said: (Jul 16, 2016)  
In Four Roll Mill, it has a roll stand with four parallel rolls one above the other.

The top and the bottom rolls rotate in opposite direction as do the two middle rolls.

The two middle are smaller in size than the top and bottom rolls which are called backup rolls for providing the necessary rigidity to the smaller rolls.

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