Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Transcribed Image Text:4- A round sheet metal slug produced in a hole punching operation will have
the same diameter as which of the following? (a) die opening, or (b) punch.
5- proof ( el+ ɛ2+ ɛ3=D0) at constant volume
6- List three of the products produced on a rolling mill.
7- Identify the three basic types of sheet metal working operations.
8- Which of the following is typical of the work geometry in sheet metal
processes? (a) high volume-to-area ratio, or (b) low volume-to-area ratio
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- only d and earrow_forwardWhich of the following operations are closely related to open-die forging: Select one: a. Coining b. Hobbing c. Upsetting d. Flashless forgingarrow_forwardA cylindrical 4135 cold-rolled steel workpiece has an upsetting load applied at room temperature using an open-die forging with flat dies to a new height, ha = 50 mm, as shown below. The initial diameter is do = 220 mm, the initial height is ho = 180 mm. 4135 cold-rolled MPa=1100 Psi= 16000 Strain hardening exponent, n = 0.14 A) What is the diameter of the forging at the end of the forging stroke? B) What is the longitudinal true strain of the forging at the end of the forging stroke? C) What is the true (flow) stress required in the material at the end of the forging stroke? D) Using the average pressure formula, what is the corresponding coefficient of friction if the upsetting force at the end of the stroke is 170 MN?arrow_forward
- (USCS units) A part is hot forged in an impression die. The projected area of the part, including flash, = 17.3 in2. After trimming, the part has a projected area of 12.5 in2. Part geometry is complex. As heated the work metal yields at 13,000 lb/in2and no strain hardening occurs. At room temperature, the metal yields at 30,000 lb/in2. Determine the maximum force required to perform the forging operation. (use table 18.1 for Kf )arrow_forwardanswer the questionsarrow_forwardQuestion 3 A rolling operation on a 250 mm wide, 8 mm thick, 1112 cold rolled steel takes place using hardened steel rolls with a surface finish of 0.03 um. The rolls have a diameter of 350 mm and rotates at 115 rpm. The final thickness of the plate is 6 mm and the entry speed of the plate is 1.8 m/s. Calculate: 3.1 The minimum coefficient of friction required, that will make the rolling operation possible. 3.2 The required roll force. 3.3 The position of the neutral point, xn 3.4 Indicate, using a sketch, the neutral point showing all relevant notation and dimensions.arrow_forward
- Bar stock of initial diameter = 90 mm is drawn with a draft = 15 mm. The draw die has an entrancearrow_forwardName, draw a neat sketch and explain why each of the following designs ofrolling mill are used instead of a basic two high rolling mill.i) A mill consisting of four rollerii) A mill consisting of six or more rollersarrow_forwardName, draw a neat sketch and explain why each of the following designs of rolling mill are used instead of a basic two high rolling mill. i) ii) A mill consisting of four roller A mill consisting of six or more rollersarrow_forward
- 5- Complete the sentence with the correct statement for rolling operation. In the the strip is rolled continuously, through a number of stands. a) Tandem rolling mill b) Four-high mills Two-high mill Cluster mill Three-high millarrow_forwardNote:- • Do not provide handwritten solution. Maintain accuracy and quality in your answer. Take care of plagiarism. • Answer completely. • You will get up vote for sure.arrow_forwardIn rolling process 40mm thick plate is rolled to 20mm in two high rolling mills. Roll diameter is 200mm the angle of contact is 15degree. Determine no of roll passes required to obtain final desires thicknessarrow_forward
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