Manufacturing Engineering And Technology -- Access Card
7th Edition
ISBN: 9780133131109
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Textbook Question
Chapter 13, Problem 36QTP
In Example 13.1, calculate the roll force and the power for the case in which the workpiece material is 1100-O aluminum and the roll radius, R, is 8 in.
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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,
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Chapter 13 Solutions
Manufacturing Engineering And Technology -- Access Card
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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- A strip (300x30 mm) is fed through a rolling mill with two powered rolls (each with radius of 300 mm) rotating at the speed of 60 rpm. The flow stress of work material is 90 MPa, and the coefficient of friction between rolls and work is 0.12. For a single rolling operation performed at the contact angle of 6.28°, calculate the followings:a) Work thickness after rolling (in mm)arrow_forwardQ#4: (b) Explain the disadvantages of Tube Drawing process in which mandrel is not used.arrow_forwardDescribe with the aid of a neat sketches two forging processes and briefly discuss their relative merits and limitations:arrow_forward
- 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. To do 5.1 If the final width of the sheet is 200 mm, calculate the required roll force. 5.2. Explain what is roll flattening, its effects and how it can be reduced.arrow_forwardDerive the expression for roll separating force and power in rolling.arrow_forwardShow your illustration and complete solution in a drawing plate. Two parallel shafts, 11 inches apart and rotating at 75 RPM and 200 RPM, are connected by cylinders in pure rolling contact. Determine the diameters of the cylinders: (1) when they turn in opposite directions; and (2) when they turn in the same direction.arrow_forward
- Explain 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_forwardAn annealed 4340 steel strip of 300 mm width and 7 mm thickness is rolled to a thickness of 5 mm. The roll radius is 175 mm and rotates at 180 rpm. Calculate the roll force and the power required for the process.arrow_forwardA 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.arrow_forward
- Compare hot and cold rolling products in terms of surface quality, mechanical properties, force required for rolling.arrow_forwardTwo parallel shafts, 11 inches apart and rotating at 75 RPM and 200 RPM, are connected by cylinders in pure rolling contact. Determine the diameters of the cylinders: (1) when they turn in opposite directions; and (2) when they turn in the same direction.arrow_forwardEstimate the roll force, F, and the torque for an AISI 1020 carbon-steel strip that is 200 mmwide, 10 mm thick, and rolled to a thickness of 7 mm. The roll radius is 200 mm, and itrotates at 200 rpm. Note that K = 530 MPa and n = 0.26.arrow_forward
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