Answered: Calculate the percent cold reduction…

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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This is a True or false question that has been bothersome please help
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A compression test is performed on a 2” diameter by 5” long bar of an unknown metal. At the end of the compression test, the bar has a height of 3.5 inches. The strength coefficient (K) and the work hardening coefficient (n ) are 250 MPa and 0.4, respectively. State all assumptions needed to work the problem. a) Calculate the final diameter of the bar in inches. b) Calculate the flow stress in MPa when the length of the bar is 4”.
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.
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.
An annealed copper strip 9 in wide having .2 K=80,000 psi, N=0.60, and a height of 1 in _was flat rolled to a height of 0.90 in with 12 in roller radius rotating at 120 rpm a) Calculate the force and the power .needed to operate this Process
Do both parts
What is the true sliding strain for a low carbon steel bar which is doubled in length by forging.
Low carbon steel plate that is 1.65 inches thick is to be rolled down to 1.3 inches in a single pass. The plate gets 4% wider as the thickness gets smaller. The steel plate has a 174 MPa yield strength and a 290 MPa tensile strength. The plate enters at a pace of 0.6 inches per minute. The rotating speed is 49.0 rev/min, and the roll radius is 12.8 inches. Calculate: a) Determine the minimum required coefficient of friction that would make this rolling operation possible b) exit velocity of the plate (m/min) c) forward slip (m/min) Please submit the final answers in 2 decimal places
A round disk of 200-mm diameter is blanked from a strip of 3.0-mm, half-hard cold-rolled steel whose shear strength = 300 MPa, and clearance allowance = 0.075. Determine a. the appropriate punch and die diameters, and b. blanking force Equation to use Clearance allowance value for three sheet metal groups. Compiled from [3]. Metal Group Ac 0.045 1100S and 5052S aluminum alloys, all tempers. 2024ST and 6061ST aluminum alloys; brass, all tempers; soft cold-rolled steel, soft stainless steel. 0.060 Cold-rolled steel, half hard; stainless steel, half-hard and full-hard. 0.075
Calculate the bending force required for a C50 steel I.5 mm sheet of width I m to be bent in a wiping die. The die radius used is 3 mm. C50 steel, ultimate tensile strength can be taken as 800 MPa.
1. A component is designed to be hot forged in an impression die. The projected area of the product is 5800 mm2. During the forging process flashing is formed so that the area including the flash will be 8900 mm2. The part geometry is considered to be simple and the heated work material yields at 92 MPa. Calculate the maximum force required to perform the operation. 2. What are the advantages and disadvantages to forge a product through the open forging process, rather than to machine it from the same material?

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Calculate the percent cold reduction after cold rolling 0.050-in.-thick stainless steel sheet to 0.029 in.