GATE ME 2025 Set 1 — Question 41
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Manufacturing Processes → Forming → Rolling (Load & Torque)
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Question
A plate of 30 mm thickness is fed through a rolling mill with two powered rolls. Each roll has a diameter of 500 mm. The plate thickness is to be reduced to 27 mm in a single pass. Assume no change in width. The process feasibility and the maximum draft (in mm) can be represented, respectively, asUse the coefficient of friction as 0.12
Correct answer
(A) feasible and 3.6
Solution
Given:
Initial thickness, mm
Final thickness, mm
Roll diameter, mm Roll radius, mm
Coefficient of friction, Actual draft, mmMaximum draft for self-entry is given by:Since the actual draft (3 mm) is less than the maximum draft (3.6 mm), the process is feasible. The maximum draft is 3.6 mm.
Initial thickness, mm
Final thickness, mm
Roll diameter, mm Roll radius, mm
Coefficient of friction, Actual draft, mmMaximum draft for self-entry is given by:Since the actual draft (3 mm) is less than the maximum draft (3.6 mm), the process is feasible. The maximum draft is 3.6 mm.
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