Discussion :: Workshop Technology - Section 1 (Q.No.48)
|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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