The team is rolling a 300-mm-wide strip 25-mm thick with two powered rolls each of radius = 250 mm and with entrance speed = 16m/min. The work thickness is to be reduced to 22 mm in one pass at a roll speed of 50 rev/min. The work material has a flow curve defined by K = 275 MPa and n = 0.15, and the coefficient of friction between the rolls and the work is assumed to be 0.12. a. Determine if the friction is sufficient to permit the rolling operation to be accomplished. b. Calculate the roll force. Roll speed, V, c. Calculate the roll torque and horsepower. R=roll radius p-rol pressure

The team is rolling a 300-mm-wide strip 25-mm thick with two powered rolls each of radius = 250 mm and with entrance speed = 16m/min. The work thickness is to be reduced to 22 mm in one pass at a roll speed of 50 rev/min. The work material has a flow curve defined by K = 275 MPa and n = 0.15, and the coefficient of friction between the rolls and the work is assumed to be 0.12. a. Determine if the friction is sufficient to permit the rolling operation to be accomplished. b. Calculate the roll force. Roll speed, V, c. Calculate the roll torque and horsepower. R=roll radius p-rol pressure

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Clutches, Brakes, Couplings, and Flywheels

The clutch is described as a machine element used to connect or disconnect two shafts together to transmit torque or power. The clutch works on the principles of friction. The clutch is commonly used in automobiles to transfer power from the driving shaft to the driven shaft.

Question

The team is rolling a 300-mm-wide strip 25-mm thick with two powered rolls each of radius = 250 mm
and with entrance speed = 16m/min. The work thickness is to be reduced to 22 mm in one pass at a roll
speed of 50 rev/min. The work material has a flow curve defined by K = 275 MPa and n = 0.15, and the
coefficient of friction between the rolls and the work is assumed to be 0.12.
a. Determine if the friction is sufficient to permit the
rolling operation to be accomplished.
b. Calculate the roll force.
Roll speed, v,
R= roll radius
c. Calculate the roll torque and horsepower.
-p-roll pressure
d. Exit velocity under the assumption that the plate widens
by 3% during the operation.
L= contact length
e. Calculate the forward slip.
f. Why it is recommended to use 4-high or cluster mills to
perform the rolling operation?
Figure 1: Rolling process.
g. Discuss the options to improve the process and write your
recommendation to the team.

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