EBK MANUFACTURING PROCESSES FOR ENGINEE
6th Edition
ISBN: 9780134425115
Author: Schmid
Publisher: YUZU
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Chapter 6, Problem 6.94P
To determine
The relationship between workpiece height and velocity.
The sketch of the velocity profile for the hammer.
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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)?
Circles of a metal are being punched that will be later stamped into coins. The metal has a shear strength of 32,575 psi. The sheets are 2.1 mm thick. The coin blanks are to be 16.5 mm in diameter. If sheet of metal is expected to produce 50 coin blanks, how much force is required to punch the sheets?
5) A steel specimen of rectangular cross section with 120 mm width, 180 mm
thickness and 90 mm height was upset at room temperature by open-die forging to
a height of 55 mm. If the strength coefficient and strain hardening exponent of this
material were 1015 MPa and 0.17 respectively, the coefficient of friction is 0.2, and
assuming that the thickness would not change during forging; determine the
required upsetting force at the end of stroke.
Chapter 6 Solutions
EBK MANUFACTURING PROCESSES FOR ENGINEE
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
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