A 300-mm-wide strip 25-mm thick is fed(Bottom roll removed)through a rolling mill with two poweredRollNo-slippointrolls each of radius = 250 mm. The work%3DWorkpiece-thickness is to be reduced to 22 mm inFriction forcesone pass at a roll speed of 50 rev/min. TheEntryRollExitTorquezone gap, Lzonework material has a flow curve defined byK=275 MPa and n 0.15, and the coefficient of friction between the rolls and the work is%3Dassumed to be 0.12. Determine if the friction is sufficient to permit the rolling operation tobe accomplished. If so, calculate the roll force, torque, and horsepower.

Given: The width of strip, b = 300 mm The thickness of strip, x = 25 mm The radius of rolls, R = 250…

A 300-mm-wide strip 25-mm thick is fed (Bottom roll removed) through a rolling mill with two powered Roll No-slip point rolls each of radius = 250 mm. The work Vo Workpiece thíckness is to be reduced to 22 mm in Friction forces Entry Roll zone gap, L zone Exit Torque 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. Determine if the friction is sufficient to permit the rolling operation to be accomplished. If so, calculate the roll force, torque, and horsepower.

A 300-mm-wide strip 25-mm thick is fed (Bottom roll removed) through a rolling mill with two powered Roll No-slip point rolls each of radius = 250 mm. The work Vo Workpiece thíckness is to be reduced to 22 mm in Friction forces Entry Roll zone gap, L zone Exit Torque 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. Determine if the friction is sufficient to permit the rolling operation to be accomplished. If so, calculate the roll force, torque, and horsepower.

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

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

Question

A 300-mm-wide strip 25-mm thick is fed
(Bottom roll removed)
through a rolling mill with two powered
Roll
No-slip
point
rolls each of radius = 250 mm. The work
%3D
Workpiece-
thickness is to be reduced to 22 mm in
Friction forces
one pass at a roll speed of 50 rev/min. The
Entry
Roll
Exit
Torque
zone gap, L
zone
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
%3D
assumed to be 0.12. Determine if the friction is sufficient to permit the rolling operation to
be accomplished. If so, calculate the roll force, torque, and horsepower.

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A 40 mm thick plate made from 410 grade stainless steel is to be reduced to 34 mm in one pass in a rolling operation. As the thickness is reduced, the plate widens by 3%. The entrance speed of the plate is 13 m/min and the roll radius is 310 mm with a rotational speed of 30 rpm. 5.1 Calculate the minimum coefficient of friction required, that will make the rolling operation possible. 5.2 Calculate the exit velocity of the plate. 5.3 Calculate the forward slip. 5.4 If the final width of the sheet is 200 mm, calculate the required roll force. 5.5 Explain what is roll flattening, its effects and how it can be reduced.
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