EBK MANUFACTURING PROCESSES FOR ENGINEE
6th Edition
ISBN: 9780134425115
Author: Schmid
Publisher: YUZU
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Chapter 6, Problem 6.60Q
To determine
The effect on the value of maximum reduction per pass when friction is included.
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* A cylindrical workpiece made of 1100-0 Aluminum that is 18 in high and 16 in in diameter and is to
be reduced in height by 25% by open-die forging. Let the coefficient of friction be 0.15. K=20
mpa,n=0.35,
Calculate the forging force.
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)?
6.100 A 0.25-m-wide billet of 5052-O aluminum
(K = 210 MPa, n = 0.13) is forged from a thickness
of 30 mm to a thickness of 20 mm with a long die with
a width of 75 mm. The coefficient of friction for the
die/workpiece interface is 0.25. Calculate the maximum
die pressure and required forging force.
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
Ch. 6 - Prob. 6.11QCh. 6 - Prob. 6.12QCh. 6 - Prob. 6.13QCh. 6 - Prob. 6.14QCh. 6 - Prob. 6.15QCh. 6 - Prob. 6.16QCh. 6 - Prob. 6.17QCh. 6 - Prob. 6.18QCh. 6 - Prob. 6.19QCh. 6 - Prob. 6.20QCh. 6 - Prob. 6.21QCh. 6 - Prob. 6.22QCh. 6 - Prob. 6.23QCh. 6 - Prob. 6.24QCh. 6 - Prob. 6.25QCh. 6 - Prob. 6.26QCh. 6 - Prob. 6.27QCh. 6 - Prob. 6.28QCh. 6 - Prob. 6.29QCh. 6 - Prob. 6.30QCh. 6 - Prob. 6.31QCh. 6 - Prob. 6.32QCh. 6 - Prob. 6.33QCh. 6 - Prob. 6.34QCh. 6 - Prob. 6.35QCh. 6 - Prob. 6.36QCh. 6 - Prob. 6.37QCh. 6 - Prob. 6.38QCh. 6 - Prob. 6.39QCh. 6 - Prob. 6.40QCh. 6 - Prob. 6.41QCh. 6 - Prob. 6.42QCh. 6 - Prob. 6.43QCh. 6 - Prob. 6.44QCh. 6 - Prob. 6.45QCh. 6 - Prob. 6.46QCh. 6 - Prob. 6.47QCh. 6 - Prob. 6.48QCh. 6 - Prob. 6.49QCh. 6 - Prob. 6.50QCh. 6 - Prob. 6.51QCh. 6 - Prob. 6.52QCh. 6 - Prob. 6.53QCh. 6 - Prob. 6.54QCh. 6 - Prob. 6.55QCh. 6 - Prob. 6.56QCh. 6 - Prob. 6.57QCh. 6 - Prob. 6.58QCh. 6 - Prob. 6.59QCh. 6 - Prob. 6.60QCh. 6 - Prob. 6.61QCh. 6 - Prob. 6.62QCh. 6 - Prob. 6.63QCh. 6 - Prob. 6.64QCh. 6 - Prob. 6.65QCh. 6 - Prob. 6.66QCh. 6 - Prob. 6.67QCh. 6 - Prob. 6.68QCh. 6 - Prob. 6.69QCh. 6 - Prob. 6.70QCh. 6 - Prob. 6.71QCh. 6 - Prob. 6.72QCh. 6 - Prob. 6.73PCh. 6 - Prob. 6.74PCh. 6 - Prob. 6.75PCh. 6 - Prob. 6.76PCh. 6 - Prob. 6.77PCh. 6 - Prob. 6.78PCh. 6 - Prob. 6.79PCh. 6 - Prob. 6.80PCh. 6 - Prob. 6.81PCh. 6 - Prob. 6.82PCh. 6 - Prob. 6.83PCh. 6 - Prob. 6.84PCh. 6 - Prob. 6.85PCh. 6 - Prob. 6.86PCh. 6 - Prob. 6.87PCh. 6 - Prob. 6.88PCh. 6 - Prob. 6.89PCh. 6 - Prob. 6.90PCh. 6 - Prob. 6.91PCh. 6 - Prob. 6.92PCh. 6 - Prob. 6.93PCh. 6 - Prob. 6.94PCh. 6 - Prob. 6.95PCh. 6 - Prob. 6.96PCh. 6 - Prob. 6.97PCh. 6 - Prob. 6.98PCh. 6 - Prob. 6.99PCh. 6 - Prob. 6.100PCh. 6 - Prob. 6.101PCh. 6 - Prob. 6.102PCh. 6 - Prob. 6.103PCh. 6 - Prob. 6.104PCh. 6 - Prob. 6.105PCh. 6 - Prob. 6.106PCh. 6 - Prob. 6.107PCh. 6 - Prob. 6.108PCh. 6 - Prob. 6.109PCh. 6 - Prob. 6.110PCh. 6 - Prob. 6.111PCh. 6 - Prob. 6.112PCh. 6 - Prob. 6.113PCh. 6 - Prob. 6.114PCh. 6 - Prob. 6.115PCh. 6 - Prob. 6.116PCh. 6 - Prob. 6.117PCh. 6 - Prob. 6.118PCh. 6 - Prob. 6.119PCh. 6 - Prob. 6.120PCh. 6 - Prob. 6.121PCh. 6 - Prob. 6.122PCh. 6 - Prob. 6.123PCh. 6 - Prob. 6.124PCh. 6 - Prob. 6.125PCh. 6 - Prob. 6.126PCh. 6 - Prob. 6.127PCh. 6 - Prob. 6.128PCh. 6 - Prob. 6.129PCh. 6 - Prob. 6.130PCh. 6 - Prob. 6.131PCh. 6 - Prob. 6.132PCh. 6 - Prob. 6.133PCh. 6 - Prob. 6.134PCh. 6 - Prob. 6.135PCh. 6 - Prob. 6.136PCh. 6 - Prob. 6.137PCh. 6 - Prob. 6.138PCh. 6 - Prob. 6.139PCh. 6 - Prob. 6.140PCh. 6 - Prob. 6.142DCh. 6 - Prob. 6.143DCh. 6 - Prob. 6.144DCh. 6 - Prob. 6.145DCh. 6 - Prob. 6.146DCh. 6 - Prob. 6.147DCh. 6 - Prob. 6.149D
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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
- Estimate the power for annealed low carbon steel strip 200 mm wide and 10 mm thick, rolled to a thickness of 6 mm The roll radius is 200 mm, and the roll rotates at 200 rev/min; use coefficient of friction at the die-work interface (u)= 0.1. A low carbon steel such as AISI 1020 has K (strength coefficient) = 530 MPa and n ( strain hardening exponent) = 0.26 a) 1059 kW b) 950 kW C) 1183 kW d) 875 kWarrow_forward2) Drawing: A round rod of annealed 302 stainless steel (K = 1300 MPa and n = 0.3) is being drawn from a diameter of 15 mm to a diameter of 12 mm at a speed 0.25 m/s, using a semidie angle of 8º. a. Calculate the percentage reduction, the applied force due to ideal deformation, friction, and inhomogeneous deformation. Assume coefficient of friction of 0.1. b. Calculate the required power, process efficiency, and the die pressure at the exit.arrow_forwardExplain briefly the relationship between the load-stroke in open die forging as illustrated in the figures bellow. Take in consideration the effect of coefficient of friction.arrow_forward
- Estimate the power for annealed low carbon steel strip 200 mm wide and 10 mm thlck, rolled to a thickness of 6 mm The roll radius is 200 mm), and the roll rotates at 200 rev/min; use coefficient 0f friction at the die-work interface (p)= 0.1, Alow carbon steel such as AlSI 1020 has K (strength coefficient) = 530 MPaand n (stram hardening exponent) = 0.26arrow_forwardA cylindrical workpiece of 100mm diameter and 150mm in height (Fig. 1) is upset (open die forged) at 1200° C to 100mm height disk (Fig. 2). Material of the workpiece is low carbon steel. A graphite lubricant reduces the friction to u=0.25. A press with 2-m/sec speeds is used to make this part. At 1200° C the material has the values for its C=48MPA and m=0.08 parameters Fig. 1 Height=150mm, Diameter=100mm Fig. 2 Height = 100mm, Diamete = ? mm (a) (b) (c) Determine the final diameter of the disk (see Fig. 2) Determine the true strain rate at the end of process. Calculate the flow stress at the end of the stroke.arrow_forwardA strip with a cross section 120 mm x 6 mm is being rolled with 20% reduction area, using rolls of 400 mm diameter. The coefficient of friction is 0.1. Determine : The final strip thickness. (1) The angle of bite (M) Length of deformation zone (iv) Minimum possible thickness of sheet that can be produced in one passarrow_forward
- Explain the methods of reducing or eliminating springback in bending with proper diagram.arrow_forwardExample 10.3 A cylindrical billet of 40 mm diameter and 100 mm length is reduced by indirect (backward) extrusion to a 15 mm diameter using Flat dies. If the Johnson equation has a = 0.8 and b = 1.5 and the flow curve for the work metal has K = 750 MPa and n = 0.15, determine : (i) Extrusion rations (ii) True strain (homogencous deformation) (iii) Extrusion strain (iv) Ram forcearrow_forwardThe thickness of a sheet is reduced by rolling (without any change in width) using 600 mm diameter rolls. Neglect elastic deflection of the rolls and assume that the coefficient of friction at the roll-workpiece interface is 0.05. The sheet enters the rotating rolls unaided. If the initial sheet thickness is 2 mm, the minimum possible final thickness that can be produced by this process in a single pass isarrow_forward
- Die restrictions affect forging methods. What are this grouping's three main categories?arrow_forwardShow that the true strain rate in extruding a round billet of radius r, as a function of distance x from the entry of a conical die can be given as: 2V,rtana where; V.: ram velocity = (ro-xtana)arrow_forwardThickness of the plate is reduced from 40mm to 20mm by succesive cold rolling passes using identical rolls of diameter 600 mm. Assume that there is no change in width. If the coefficient of friction b/w the rolls and the workpiece is 0.1. Determine the minimum number of passes required?arrow_forward
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