8 A multi-pass cold rolling operation is to be used to reduce the thickness of a plate in a reversing2 high mill. The following data is provided for the rolling operation:h = 5 cm, h=2.5 cm, R = 350 mm, μ = 0.16. If the draft is to be equal on each pass, the minimumnumber of passes required is

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Answered: ti-pass cold rolling operation is to be…

ti-pass cold rolling operation is to be used to red mill. The following data is provided for the ro cm, h=2.5 cm, R = 350 mm, μ = 0.16. If the draft er of passes required is.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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0/ 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.
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.
A hot rolling operation is being carried out on 250 mm wide and 25mm thick low carbon steel (C=165MPA, m=0.10) plate at 1000°C. The roll diameter is 450mm and it is rotating at 120 proposed that a reduction of 20% be taken in the rolling process. rpm. It is If the strain rate in the rolling processes can be expressed by the following expression: V, h. = 3 L h, Where V, is the roll surface speed, ho is the intial thickness of the plate, hfis the final thickness of the plate and L is the contact length between the roll and plate in the deformation zone. Compute the flow stress required to deform the carbon steel plate.
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.
5) A steel specimen of rectangular cross section with 120 mm width, 180 mm thickness and 90 mm height was upset at room temperature by open-die forging to a height of 55 mm. If the strength coefficient and strain hardening exponent of this material were 1015 MPa and 0.17 respectively, the coefficient of friction is 0.2, and assuming that the thickness would not change during forging; determine the required upsetting force at the end of stroke.
Figure 1. shows the rolling operation. Determine the position bn. of the neutral point? Neglect front and back tensions. Additional data: Hardened steel 0.04 μm and rolling temperature -190°C. rolls, surface roughness of the rolls 0.3 in. 1-5t/s R=4 in. Fig:1 0.1 in. 7 ft/s
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.
Wire is drawn through a draw die with entrance angle a= 17°. Starting diameter is 3.0 mm and final diameter = 2.4 mm. The coefficient of friction at the work-die interface = 0.08. The metal has a strength coefficient K = 205 MPa and a strain-hardening exponent n = draw force in this operation. Why are multiple passes usually required to achieve the desired reduction? (Hint: Observe the draw stress value found in this question) 0.20. Determine the draw stress and Lubricant box Initial wire stock (in coil form) Multiple pass/draft drawing Draw die V2, F V3, F shown in figure. Capstan drum (holds multiple loops of wire) (1) (2) (3)
Questions: 1. Two thick slabs of 300mm each, the first one is used in cold rolling where u=0.08 while the second is used in cold rolling where u-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. = 2. A tensile specimen of the metal of 100 mm is length stretched to a length 157 mm during the rolling process. If the metal has a flow curve with parameters: K = 850 MPa and strain hardening exponent n = 0.30. Determine the average flow stress that the metal has been subjected to during the deformation.
In a single pass rolling process using 410 mm diameter steel rollers, a strip width 140 mm and thickness 8 mm undergoes 10% reduction of thickness. Find the angle of bite in radians?
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 kW
I need only part d) plz answer in 30min 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.