EBK MANUFACTURING PROCESSES FOR ENGINEE
6th Edition
ISBN: 9780134425115
Author: Schmid
Publisher: YUZU
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Chapter 6, Problem 6.127P
To determine
The smaller press is sufficient for the operation or not.
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An open die forging operation is performed to produce a steel cylinder with a diameter of
9.7mm and a height of 1.7mm. The strength coefficient for this steel is 500MPA, and the
strain hardening exponent is 0.25. Coefficient of friction at the die-work interface is 0.12.
The initial stock of raw material has a diameter of 5mm.
(a) What height/length of stock is needed to provide sufficient volume of material for this
forging operation?
(b) Compute the maximum force that the punch must apply to form the head in this open-
die operation.
A cylindrical billet that is 80 mm long and 32 mm diameter is reduced by
backward extrusion to a 12 mm diameter. Half die angle is 90°. If the
Johnson equation has a= 0.8 and b= 1.2 , and the flow curve for the work
material has strength coefficient is 500 MPa, and strain hardening
exponent is 0.8, Determine (a) extrusion ration, (b) true strain, (c)
extrusion strain, (d) ram pressure, and (e) ram force.
A billet 100 mm long and 40 mm diameter is to be extruded in a direct extrusion with
final diameter of product 32 mm. The semi die angle is 60°. The work metal has a
strength coefficient 500 Map, and strain hardening 0.2 use the Johnson formula with
a=0.8 and b=1.45 to estimate the extrusion strain. Determine the pressure applied to
the end of the billet as the ram moves forward.
Chapter 6 Solutions
EBK MANUFACTURING PROCESSES FOR ENGINEE
Ch. 6 - Prob. 6.1QCh. 6 - Prob. 6.2QCh. 6 - Prob. 6.3QCh. 6 - Prob. 6.4QCh. 6 - Prob. 6.5QCh. 6 - Prob. 6.6QCh. 6 - Prob. 6.7QCh. 6 - Prob. 6.8QCh. 6 - Prob. 6.9QCh. 6 - Prob. 6.10Q
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