EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 8220100793431
Author: KALPAKJIAN
Publisher: PEARSON
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Chapter 13, Problem 50SDP
Derive an expression for the thickest workpiece that can be drawn between two rolls as a function of roll gap, roll radius, and coefficient of friction.
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Q/
A plate of 270 mm wide and 25 mm thick from carbon steel. A two-high
rolling mill is used to reduce the thickness to 20 mm. Roll radius = 600 mm,
and roll speed = 8 rpm. Strength coefficient = 500 MPa, and strain hardening
exponent = 0.25. Determine (a) roll force, (b) roll torque, and (c) power
required to perform the operation.
Don't try if you don't know and don't provide handwritten solution
Estimate the power for annealed low carbon steel strip 200 mm wide and 10 mm thick, rolled to a thickness of 6 mm
The roll radius is 200 mm, and the roll rotates at 200 rev/min; use coefficient of friction at the die-work interface (u)=
0.1. A low carbon steel such as AISI 1020 has K (strength coefficient) = 530 MPa and n ( strain hardening exponent) =
0.26
a)
1059 kW
b)
950 kW
C) 1183 kW
d)
875 kW
Chapter 13 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
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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- Estimate the power for annealed low carbon steel strip 200 mm wide and 10 mm thick, rolled to a thickness of 6 mm. The roll radius is 200 mm, and the roll rotates at 200 rev/min; use coefficient of friction at the die-work interface (p)=0.1. A low carbon steel such as AISI 1020 has K (strength coefficient) = 530 MPa and n ( strain hardening exponent) =0.26a)1059 kWb)950 kWc)1183 kWd)875 kWarrow_forward2)arrow_forwardIf coefficient of friction µ in a rolling process is 0.5 and radius of roller is 1,000 mm, what is the maximum reduction or draft possible?arrow_forward
- A 300 mm thick slab is being cold rolled using roll of 600 mm diameter. If the coefficient of friction is 0.08, the maximum possible reduction is,arrow_forwardIn a rolling operation using rolls of diameter 500 mm, if a 25 mm thick plate cannot be reduced to less than 20 mm in one Pass, Estimate the coefficient of friction between the roll and the plate.arrow_forwardAnswer it fast pleasearrow_forward
- 2. 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_forwardExplain briefly the relationship between the load-stroke in open die forging as illustrated in the figures bellow. Take in consideration the effect of coefficient of friction.arrow_forwardA strip with a cross section 120 mm x 6 mm is being rolled with 20% reduction area, using rolls of 400 mm diameter. The coefficient of friction is 0.1. Determine :* The final strip thickness. () The angle of bite () Length of deformation zone (v) Minimum possible thickness of sheet that can be produced in one passarrow_forward
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