4500_HW5

# 4500_HW5 - consider over-bending solution Sketch the...

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University of Missouri-Columbia Department of Mechanical and Aerospace Engineering Manufacturing Methods Fall 2006 MAE 4500 HW #5 1. Sheet Forming A bracket made of leaded brass (E brass =105 × 10 3 MPa) is manufactured by fine blanking, piercing, and bending operations (see Fig. 1) a. Make a sketch of the blanking process (identifying die elements) that assures perpendicular cut surfaces with smooth finish. Explain why the process will result in the required quality. b. Calculate the force required for punching the holes use C 1 = 0.70. c. Calculate the minimum bending radius allowable to avoid necking and the amount of springback in a normal bending operation. Sketch the process. d. Suggest a bending technique that will eliminate any spring back (do not

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Unformatted text preview: consider over-bending solution). Sketch the process and explain why the process will result in the required quality. Figure 1 2. a. Define the differences between normal and planar anisotropy indices of sheet materials. Indicate how each phenomenon affects sheet forming process behavior. b. An aluminum 5052 can, shown in Fig. 2, is to be produced by sheet forming operations. If the volume of the initial blank is 9.817 in 3 , find the initial diameter of the blank and design a process plan to produce the part. Sketch each operation needed and calculate the required forces for the first drawing operation . (LDR for Al 5052 = 2.2). 5.0” dia. 0.125” 0.0625” Figure 2...
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4500_HW5 - consider over-bending solution Sketch the...

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