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.

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.

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

See similar textbooks

Similar questions

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.
q1)Work-parts that have low area to- volume ratio are called. Select one: a. Bulk b. Billets c. Sheet metals d. Foils e. Plates q2)A 42.0-mm-thick plate made of low carbon steel is to be reduced to 34.0 mm in one pass in a rolling operation. As the thickness is reduced, the plate widens by 4%. The yield strength of the steel plate is 174 MPa and the tensile strength is 290 MPa. The entrance speed of the plate is 15.0 m/min. The roll radius is 325 mm and the rotational speed is 49.0 rev/min. Determine (a) the minimum required coefficient of friction that would make this rolling operation possible?
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.
e) :- An extrusion Process is to Yeduce a 80mm long eylindrical billet from an initial diameter of 5omm to afinal diameter of 15mm.The extrusion die has a die angle 90°. The wor k Malevial has strength čoetficient K=600 MPa, n: 0.25.In the Johnson equation, a = 0.8 and b=1.5 Determine : 1- EXtru sion vatio 2-True strain assuming homogenous deformakion. 3- Ram force. 4. Ram Power if ram speed is 300 mm/min. %3D
Q1) Choose the correct answer in the following questions (some questions have multiple answers that are correct). 1. The appropriate punch size for a blanking operation using to perform a cold-rolled steel (half hard) circular part with diameter = 75.0 mm and 2.0 mm thick is: (a) Punch diameter = 77.72 mm and Die diameter = 74.50 mm. (b) Punch diameter = 73.50 mm and Die diameter = 75.50 mm. (c) Punch diameter = 74.70 mm and Die diameter = 75.0 mm. (d) Punch diameter = 75.62 mm and Die diameter = 76.0 mm. 2. In sheet metal processes, the typical of starting work geometry is: (a) high volume-to-area ratio. (b) low volume-to-area ratio. (c) equal volume-to-area ratio. 3. The characteristics of hot working relative to cold working are: (a) fracture of workpart is less likely, (b) friction is reduced, (c) increased strength properties, (d) isotropic mechanical properties, (e) less overall energy is required, (f) lower deformation forces are required, (g) more significant shape changes are…
4- A round wire made of a 70-30 Brass (K=900 MPa, n=0.49) is being drawn a diameter of .08 in and length 25 in to a length of 20 in, in a draw die of 15°. Let the coefficient of friction be 0.15. a) Calculate the drawing force required (frictionless). b) Calculate the drawing force required (including friction).
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.
Manufacturing Processes Q1. Chose the correct answer: 1. Which of the following are variations of sheet-metal-bending operations: (a) coining, (b) flanging, (c) hemming, (d) ironing, (e) notching, (f) shear spinning, (g) trimming, and (h) tube bending? 2. Springback in a sheet-metal-bending operation is the result of which one of the following: (a) elastic modulus of the metal, (b) elastic recovery of the metal, (c) overbending, (d) overstraining, or (e) yield strength of the metal? 3. The cutting force in a sheet-metal blanking operation depends on which mechanical property of the metal (one correct answer): (a) compressive strength, (b) modulus of elasticity, (c) shear strength, (d) strain rate, (e) tensile strength, or (f) yield strength? 4. A circular sheet-metal slug produced in a hole punching operation will have the same diameter as (a) the die opening or (b) the punch? 5. As sheet-metal stock hardness increases in a blanking operation, the clearance between punch and die should…
Manufacturer process A compound die will be used to blank and punch a large rectangle (90x150mm blank dimensions) out of 6061ST aluminum alloy sheet stock 3.5 mm thick. The diameter of inside hole is 25 mm. The aluminum sheet metal has a tensile strength = 310 MPa. Determine the minimum tonnage press (force) to perform the blanking and punching operation (1) assume that blanking and punching occur simultaneously and (2) assume that punching occurs first, then blanking. Take: Ac=0.06
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)
aragraph v F 1 Normal 1 No Spac... Heading 1 Heading 2 85.00 50.00 25.00 A blanking operation is to be performed to create the part shown below out of 2-mm thick half- hard 405 stainless steel. Provide (a) a drawing showing the punch dimensions; (b) a drawing showing the die dimensions; (c) the blanking force necessary. Note: you will need to translate tensile strength to shear based on the conversion from the text and use material properties from the text as well, tensile strength of 405 can be found in Ch. 6 (Metals). All dimensions noted below are in mm. hp 25.00 T Title 25.00 Subtitle Subtle Em... Emphasis DI Styles
16 30. Forging process is suitable for mass production. Select one: True False