I need the answer as soon as possible 19.3. A series of cold rolling operations are to be used to reduce the thicknessof a plate from 50 mm down to 25 mm in a reversing two-high mill. Roll diameter=700 mm and coefficient of friction between rolls and work = 0.15. The specificationis that the draft is to be equal on each pass. Determine (a) minimum number of27.passes required, and (b) draft for each pass?

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Answered: 19.3. A series of cold rolling…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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6) Which of the following method(s) reduce the roll separating force in a rolling process? i. Reducing the roller diameter ii. Increasing friction between the rolls and the metal iii. Decreasing friction between the rolls and the metal i & iii only ii & iii only i only i,ii & i
The maximum possible draft in rolling which is the difference between initial and final thickness of the sheet metal, depends on A. Rolling force B. Roll radius C. Roll width D. Yield shear stress of the material
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.
2. Forging. Based on 18.12 (7th ed.) A cylindrical work part has a starting height of 4 inches and a starting diameter of 2.5." In an open-dic forging process, the final height is 2.75". The cocfficient of friction is 0.10 and K = 25,000 psi and n = 0.22. Find the force required, in pounds, at the following heights: a) h= 3.992 in (the start of plastic deformation.) b) h = 3.375 in. (the halfway point) c) h = 2.75 in. (the final height)
1. What process is flexible and is widely used for bending plates for applications such as boilers, cylindrical pressure vessels and various curved structural members? 2. Final velocity of strip in rolling is greater than its initial velocity? True or false?
L) Friction between .................. and .... ........... in direct extrusion more forcerequires.m) The method of sheet forming in which springback is prevented is named ..........
A solid cylinder of diameter 100 mm and height 50 mm is forged between two frictionless flat dies to a height of 25 mm The percentage change in diameter is... (a) 0 (b) 2.07 (c) 20.7 (d) 41.4
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. 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.
18.2 (SI units) A series of cold-rolling operations are to be used to reduce the thickness of a metal plate from 50 mm to 20 mm in a reversing two-high mill. Roll diameter %| 600 mm and coefficient of friction between rolls and work = 0.15. The specification is that the draft is to be equal on each pass. Determine (a) the minimum number of passes required and (b) draft for each pass.
0.075L T 0.8 4.0 -7.0 + All dimensions in inches -2.0- 0.1 T 0.205 0.25 T 0.25 5) Rolling: A rolling operation is performed on a 5 mm thick sheet of low carbon steel (K=530, n=0.26 from Table 8.1). The sheet is reduced by 0.2 mm each pass. The friction at the dies is 0.3. The roller diameters are 50 mm. The sheet width is 125 mm. a) Find the roll force for the 3rd pass. For the 3rd pass the initial thickness is 4.6 mm and the final thickness is 4.4 mm. a) Estimate the power to perform the 3rd pass if the roll rotates at 100 rpm.
8) In blanking operation, if the final blank diameter is 200 mm & the clearance is 1.5 mm, then the Die size should be. 22) In rolling, if the maximum dratt is 12 mm. & the coefficient of friction is 0.2, thus the minimum roll diameter is 111111. mm
Q3) 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. 1500- 1000- 500 75 62 49 36 h (mm) 13 26 39 (h.-h) Stroke Forging force (1000 N)

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