03:A 42.0 mm-thick plate made of low carbon steel is to be reduced to 34.0 mm in one pass in a rollingoperation. As the thickness is reduced, the plate widens by 4%. The yield strength of the steel plate is 174MPa and the tensile strength is 290 MPa. The entrance speed of the plate is 15.0 m/min. The roll radius is250 mm and rotational speed is 49.0 rev/min. Determine:1. Minimum required coefficient of friction that would make this rolling operation possible.2. Exit velocity of the plate.04:A metal has a flow curve with strength coefficient is 850 MPa and strain- hardening exponent is 0.30. Atensile specimen of the metal with gauge length of 100 mm is stretched to a length of 157 mm. Determinethe flow stress at the new length and the average flow stress that the metal has been subjected to during3. Forward slip.the deformation.05:A plate that is 250 mm wide and 25 mm thick is to be reduced in a single pass in a two-high rolling millto a thickness of 20 mm. the roll has a radius of 500 mm, and its speed is 30 m/min. the work materialhas a strength coefficient of 240 MPa and a strain hardening exponent of 0.2. Determine:I. roll force.2. Roll torque.3. Power required to accomplish this operation.

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A 42.0 mm-thick plate made of low carbon steel is to be reduced to 34.0 mm in one pass in a rolling operation. As the thickness is reduced, the plate widens by 4%. The yield strength of the steel plate is 174 MPa and the tensile strength is 290 MPa. The entrance speed of the plate is 15.0 m/min. The roll radius is 250 mm and rotational speed is 49.0 rev/min. Determine: 1. Minimum required coefficient of friction that would make this rolling operation possible. 2. Exit velocity of the plate. 3. Forward slip.

A 42.0 mm-thick plate made of low carbon steel is to be reduced to 34.0 mm in one pass in a rolling operation. As the thickness is reduced, the plate widens by 4%. The yield strength of the steel plate is 174 MPa and the tensile strength is 290 MPa. The entrance speed of the plate is 15.0 m/min. The roll radius is 250 mm and rotational speed is 49.0 rev/min. Determine: 1. Minimum required coefficient of friction that would make this rolling operation possible. 2. Exit velocity of the plate. 3. Forward slip.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Section: Chapter Questions

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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

03:
A 42.0 mm-thick plate made of low carbon steel is to be reduced to 34.0 mm in one pass in a rolling
operation. As the thickness is reduced, the plate widens by 4%. The yield strength of the steel plate is 174
MPa and the tensile strength is 290 MPa. The entrance speed of the plate is 15.0 m/min. The roll radius is
250 mm and rotational speed is 49.0 rev/min. Determine:
1. Minimum required coefficient of friction that would make this rolling operation possible.
2. Exit velocity of the plate.
04:
A metal has a flow curve with strength coefficient is 850 MPa and strain- hardening exponent is 0.30. A
tensile specimen of the metal with gauge length of 100 mm is stretched to a length of 157 mm. Determine
the flow stress at the new length and the average flow stress that the metal has been subjected to during
3. Forward slip.
the deformation.
05:
A plate that is 250 mm wide and 25 mm thick is to be reduced in a single pass in a two-high rolling mill
to a thickness of 20 mm. the roll has a radius of 500 mm, and its speed is 30 m/min. the work material
has a strength coefficient of 240 MPa and a strain hardening exponent of 0.2. Determine:
I. roll force.
2. Roll torque.
3. Power required to accomplish this operation.

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