Manufacturing Engineering & Technology
Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 34, Problem 27QTP

Taking a simple example, such as the parts shown in Fig. 34.1, estimate the force required for roller burnishing. (Hint: See Sections 2.6 and 14.4.)

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Explain the production of bolts by rubbing method by drawing a figure. Compare and write the advantages of machining with bolt manufacturing.
The figure below shows a symmetric plane-strain upsetting process. The process may also be thought of as a form of side extrusion. Observations show that the deformation is confined to two shear planes, each one being analogous to that seen in plane-strain cutting. You may assume that there is no friction between the work material and the tool/die walls; the uniaxial yield strength of the material is σy and is independent of strain rate and temperature, and the material behaves as a rigid plastic solid.  a) Calculate the pressure (p) required for the upsetting process in terms of σy.  b) If friction existed at the die walls and the frictional work (energy) dissipation was 30% of the energy required for shape change alone (part (a) above), then what would be the pressure (p)?
1. In the manufacture of automotive-body panels from carbon-steel sheet, stretcher strains (Lueders bands) are observed, which detrimentally affect surface finish. How can stretcher strains be eliminated? Explain with appropriate sketches. Also discuss how wrinkles in a deep drawing operation can be eliminated.

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