EBK MANUFACTURING PROCESSES FOR ENGINEE
6th Edition
ISBN: 9780134425115
Author: Schmid
Publisher: YUZU
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Chapter 6, Problem 6.107P
To determine
Theanalytical expression for the magnitude of the back tension.
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Briefly explain various methods available for breakdown passes in rolling. Explain their applications.
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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.
In a slab rolling operation, the maximum thickness reduction (del hmax) is given by del hmax = μ²R, where R is the radius of the roll and u is the coefficient of friction between the roll and the sheet. If µ = 0.1, find the maximum angle subtended by the deformation zone at the centre of the roll.
Chapter 6 Solutions
EBK MANUFACTURING PROCESSES FOR ENGINEE
Ch. 6 - Prob. 6.1QCh. 6 - Prob. 6.2QCh. 6 - Prob. 6.3QCh. 6 - Prob. 6.4QCh. 6 - Prob. 6.5QCh. 6 - Prob. 6.6QCh. 6 - Prob. 6.7QCh. 6 - Prob. 6.8QCh. 6 - Prob. 6.9QCh. 6 - Prob. 6.10Q
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
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- 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 Oarrow_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_forwardA 300mm thick slab is being cold rolled using roll of 600mm diameter.If the coefficient of friction is 0.08. Determine the maximum possible reduction.arrow_forward
- A hot/cold rolling setup is shown right. The operation first hot rolls a 3/8” thick plate, 12” wide (w), of6061 Aluminum, to an intermediate thickness, then finally through cold rolling, down to 1/4” thick plate.The friction factor μ is assumed to be constant at 0.15 for the hot roll, 0.12 for the cold rolling stage. Thefirst set of rolls operate at 50 RPM. Also ignore any width increase during rolling. CW=13% or .13 What is the plate thickness (mm) prior to the last rolls, t1, if the last set of rollers perform cold work reduction listed below at .13 or 13% Note that 9.52 mm is equal to 3/8 of an inch.arrow_forward0/ Two thick slabs of 300mm each, the first one is used in cold rolling where μ=0.08 while the second is used in cold rolling where µ-0.5. The mill roll diameter in each case is the same as 600mm. Determine the max draft (reduction) in both cases. Discuss the wide difference in results.arrow_forward15.A 4.50-in-thick slab that is 9 in wide and 24 in long is to be reduced in a single pass in a two-high rolling mill to a thickness of 3.87 in. The roll rotates at a speed of 5.50 rev/min and has a radius of 17.0 in. The work material has a strength coefficient = 30,000 lb/in2 and a strain hardening exponent= 0.15. The roll force is 483,000 lb 583,000 lb 383,000 lb nonearrow_forward
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