Answered: forming temperature condition. 8) In…

forming temperature condition. 8) In blanking operation, if the final blank diameter is 200 mm & the clearance is 1.5 mm, then the Die size should be 9) Cold working of metals decreases. 1.

Welding: Principles and Applications (MindTap Course List)

8th Edition

ISBN:9781305494695

Author:Larry Jeffus

Publisher:Larry Jeffus

Chapter25: Testing And Inspection

Section: Chapter Questions

Problem 29R: Why are guidelines drawn on the surface of a free-bend specimen?

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ESSE metal forming condition. 5) One of the common methods to reduce spring back in bending process is by- 4) Residual stresses (internal stresses) is found in
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.
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…
An automated blanking and forming line is designed to from 2 mm thick sheet, made from 2024 Aluminum, T4 temper, into a square sheet metal part. Elongation at 50mm 20% Young’s Modulus 70GPa Yield strength 325 MPa UTS 470 A) What is the force required to punch a square piece that is 500 mm on each edge? B) If the sheet blank was bent to a radius of 5 mm, what will be the radius after springback occurs? C) What is the required bend angle to achieve a 90° final bend angel for a bend radius of 5 mm?
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?
B) In a metal forming operation, where the strength coefficient (K = 300 MPa), flow stress is 130 MPa, & the true strain is 0.02. Determine the average or mean flow stress if the maximum strain value during the deformation process is 0.3.
In sheet metal parts, the minimum bending radius is dependent on which of the following elements? a. Thickness b. Type of a material c. State of material d. Thickness and type of material e. Type of process.
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.
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)
3) Which of the below statements is/are correct regarding deep drawing process? i. If the clearance between the punch and the die is less than the thickness produced by free thickening, the metal in these regions will be squeezed, or ironed. ii. The force on the punch required to produce a cup is the summation of the ideal force of deformation, the frictional forces, and the force required to produce ironing (if present). i only ii only Both i and ii None of the above
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…
A brass blank was produced using a force of 25.194 tonnes. The blanking punch radius was measured as 87.889 mm. The blank was prepared to be deep drawn with a 98 mm diameter punch. If you know that the drawing ratio = 1.7959, the deep drawing die radius = 10 mm and the yield strength of :brass = 135 MPa, determine a) The blank thickness = mm b) Shear strength of brass = MPa c) Tensile strength of brass = MPa d) Deep drawing die dimensions = mm e) Show whether the drawing process can be done in one pass or not using three feasibility tests