Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 13, Problem 26QLP
Flat rolling can be carried out by front tension only, using idling rolls (Steckel rolling). Since the torque on the rolls is now zero, where, then, is the energy coming from to supply the work of deformation in rolling?
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A metal strip is to be rolled from an initial wrought thickness of 3.5 mm to a final rolled thickness of 2.5 mm in a single pass rolling mill having rolls of 250 mm diameter. The strip is 450 mm wide. The average coefficient of friction in the roll gap is 0.08. Taking plane strain low stress of 140 MPa, for the metal and assuming negligible spreading, the roll separating force is.....
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 = 500 mm, and its
speed = 30 m/min. The work
material has a strength coefficient
= 240 MPa and a strain hardening
exponent = 0.2. Determine (a)roll
force, (b) roll torque, and (c)
power required to accomplish this
.operation
1365 N & 529865 N-m & 452 W O
500250 N & 12005 N-m & 2456 W O
71254632 N & 135674 N-m & 12053 W O
1851829 N & 46296 N-m & 92,591 W O
(c) A flat rolling operation is being carried out where the roll radius is 200 mm and the roll
rotates at 100 rpm. The workpiece material is annealed low carbon steel with 200 mm wide
and 10 mm thickness. The strength coefficient and the strain hardening of the carbon steel
are 530 MPa and 0.26, respectively. The coefficient of friction is 0.2.
(i)
Caicurae tne roll force and torque if the workpiece is rolled to a thickness of 4 mm.
(ii)
Calculate the maximum possible draft and evaluate how friction effect the thickness
of the rolled workpiece.
Chapter 13 Solutions
Manufacturing Engineering & Technology
Ch. 13 - What is the difference between a plate and a...Ch. 13 - Define roll gap, neutral point, and draft.Ch. 13 - What factors contribute to spreading in flat...Ch. 13 - What is forward slip? Why is it important?Ch. 13 - Describe the types of deflections that rolls...Ch. 13 - Describe the difference between a bloom, a slab,...Ch. 13 - Why may roller leveling be a necessary operation?Ch. 13 - List the defects commonly observed in flat...Ch. 13 - What are the advantages of tandem rolling? Pack...Ch. 13 - How are seamless tubes produced?
Ch. 13 - Why is the surface finish of a rolled product...Ch. 13 - What is a Sendzimir mill? What are its important...Ch. 13 - What is the Mannesmann process? How is it...Ch. 13 - Describe ring rolling. Is there a neutral plane in...Ch. 13 - How is back tension generated?Ch. 13 - Explain why the rolling process was invented and...Ch. 13 - Flat rolling reduces the thickness of plates and...Ch. 13 - Explain how the residual stress patterns shown in...Ch. 13 - Explain whether it would be practical to apply the...Ch. 13 - Describe the factors that influence the magnitude...Ch. 13 - Explain how you would go about applying front and...Ch. 13 - What typically is done to make sure that the...Ch. 13 - Make a list of parts that can be made by (a) shape...Ch. 13 - Describe the methods by which roll flattening can...Ch. 13 - It was stated that spreading in flat rolling...Ch. 13 - Flat rolling can be carried out by front tension...Ch. 13 - Explain the consequence of applying too high a...Ch. 13 - Note in Fig. 13.3f that the driven rolls (powered...Ch. 13 - Describe the importance of controlling roll...Ch. 13 - In Fig. 13.9a, if you remove the top compressive...Ch. 13 - Name several products that can be made by each of...Ch. 13 - List the possible consequences of rolling at (a)...Ch. 13 - It is known that in thread rolling, as illustrated...Ch. 13 - If a rolling mill encounters chatter, what process...Ch. 13 - Can the forward slip ever become negative? Why or...Ch. 13 - In Example 13.1, calculate the roll force and the...Ch. 13 - Calculate the individual drafts in each of the...Ch. 13 - Estimate the roll force, F, and the torque for an...Ch. 13 - A rolling operation takes place under the...Ch. 13 - Estimate the roll force and power for annealed...Ch. 13 - A flat-rolling operation is being carried out...Ch. 13 - A simple sketch of a four-high mill stand is shown...Ch. 13 - Obtain a piece of soft, round rubber eraser, such...Ch. 13 - If you repeat the experiment in Problem 13.45 with...Ch. 13 - Design a set of rolls to produce cross-sections...Ch. 13 - Design an experimental procedure for determining...Ch. 13 - Derive an expression for the thickest workpiece...
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- Walk-Through Video Dashboard Note: - You are attempting question 4 out of 12 In a rolling operation, a plate of 2 cm thick and 25 cm wide is passed through a rolling mill having 2 powered rolls. Assume friction was enough for rolling. Thickness of the plate at the end of operation is 1.7 cm. Each roll has a radius of 0.3 m and a roll speed of 0.5 revolution per second. Flow curve has the following values K = 225 MPa and n = 0.15. Determine the power required for driving the rolls.arrow_forwardA plate that is 260 mm wide and 27 mm thick is to be reduced in a single pass in a two‑high rolling mill to a thickness of 22 mm. The roll has a radius = 510 mm, and its speed = 25 m/min. The work material has a strength coefficient = 235 MPa and a strain hardening exponent = 0.21. Determine (a) roll force, (b) roll torque, and (c) power required to accomplish this operationarrow_forwardDerive the expression for roll separating force and power in rolling.arrow_forward
- Thickness of the plate is reduced from 40mm to 20mm by succesive cold rolling passes using identical rolls of diameter 600 mm. Assume that there is no change in width. If the coefficient of friction b/w the rolls and the workpiece is 0.1. Determine the minimum number of passes required?arrow_forward2. A 300 mm wide, 40 mm thick plate is reduced to 30 mm thickness in one pass by hot rolling. Roll diameter is 200 mm and entrance speed is 16 m/min. Material constants C and m at the process temperature are given as 50 MPa and 0.05 respectively. Determine: a. The minimum friction coefficient required to make this operation possible, b. Assuming that the minimum level of friction is maintained, calculate the exit velocity of the plate by considering there is no widening, c. Calculate the force and power requirement to apply the pass.arrow_forwardPlease give me full explanation in 1hour do it fast A 4-in-thick aluminum slab is 10 in wide and 100 in long. It is reduced in one pass in a two-high rolling mill to a thickness = 3.5 in. The roll rotates at a speed = 12 rev/min and has a radius = 20 in. The aluminum has a strength coefficient = 25,000 lb/in2 and a strain hardening exponent = 0.20. Determine the (a) roll force, (b) roll torque, and (c) power required to accomplish this operation, d) Estimate the GHG emission in an hour for the rolling operation.arrow_forward
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