DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Chapter 19, Problem 33RQ
To determine
The need for the all bends in a product is of same radius.
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2. In 4-point bending, it has a higher
probability that defects will exist due to a larger
volume of a material subjected to a bending
moment. True or false?
You have been asked to work on some design problems and technically support the team working on
extrusion and forging operations:
1) The team are extruding a billet that is 80 mm long with diameter of 40 mm is directly to a diameter
of 20 mm. The extrusion die has a die angle of 75°, see Figure 1. For the work metal, K = 600 MPa
and n = 0.25. In the Johnson extrusion strain equation, a = 0.8 and b = 1.4.
Remaining billet length
75
Ram pressure, p
D.
Dr
Figure 1: Extrusion process.
Determine the following design parameters:
(a) Extrusion ratio.
(b) True strain (homogeneous deformation).
(c) Extrusion strain.
(d) Ram pressure at L= 80, 40, and 10 mm.
(e) Draw the relationship between the ram pressure and billet length and discuss the results. What are
your recommendations to dccrcase the required ram pressure?
Must be detailed responses
Question : Provide a precise definition of the cross-product. And give an explanation of how it relates to moments of forces.
Chapter 19 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 19 - What distinguishes sheet forming from bulk...Ch. 19 - What is a definition of shearing?Ch. 19 - Prob. 3RQCh. 19 - What measures can be employed to improve the...Ch. 19 - How does fineblanking create shearing in a...Ch. 19 - Prob. 6RQCh. 19 - What types of cuts are made by squaring shears?Ch. 19 - Why might a long shearing cut be made in a...Ch. 19 - What is a slitting operation?Ch. 19 - What is the difference between piercing and...
Ch. 19 - Prob. 11RQCh. 19 - Prob. 12RQCh. 19 - Prob. 13RQCh. 19 - Prob. 14RQCh. 19 - Prob. 15RQCh. 19 - Prob. 16RQCh. 19 - What is the benefit of making dies as a multipiece...Ch. 19 - Prob. 18RQCh. 19 - Prob. 19RQCh. 19 - Prob. 20RQCh. 19 - Prob. 21RQCh. 19 - Prob. 22RQCh. 19 - When making bends in sheet metal, what is the...Ch. 19 - Prob. 24RQCh. 19 - Prob. 25RQCh. 19 - Why does a metal usually become thinner in the...Ch. 19 - Prob. 27RQCh. 19 - Prob. 28RQCh. 19 - Prob. 29RQCh. 19 - What types of operations can be performed on a...Ch. 19 - Prob. 31RQCh. 19 - Prob. 32RQCh. 19 - Prob. 33RQCh. 19 - Prob. 34RQCh. 19 - What is the primary benefit of incorporating a...Ch. 19 - Prob. 36RQCh. 19 - What is the benefit of using a urethane (rubber)...Ch. 19 - What is the objective of the roll bending process?Ch. 19 - What is the role of the form block in draw bending...Ch. 19 - Prob. 40RQCh. 19 - Prob. 41RQCh. 19 - Prob. 42RQCh. 19 - Prob. 43RQCh. 19 - Prob. 44RQCh. 19 - Prob. 45RQCh. 19 - Prob. 46RQCh. 19 - Prob. 47RQCh. 19 - Prob. 48RQCh. 19 - Prob. 49RQCh. 19 - Prob. 50RQCh. 19 - Prob. 51RQCh. 19 - Prob. 52RQCh. 19 - Prob. 53RQCh. 19 - What is the distinction between shallow drawing...Ch. 19 - What is the function of the pressure ring or...Ch. 19 - Prob. 56RQCh. 19 - Prob. 57RQCh. 19 - Prob. 58RQCh. 19 - Prob. 59RQCh. 19 - Prob. 60RQCh. 19 - Prob. 61RQCh. 19 - Prob. 62RQCh. 19 - Prob. 63RQCh. 19 - Prob. 64RQCh. 19 - Prob. 65RQCh. 19 - Prob. 66RQCh. 19 - Prob. 67RQCh. 19 - Prob. 68RQCh. 19 - Prob. 69RQCh. 19 - Prob. 70RQCh. 19 - Prob. 71RQCh. 19 - Prob. 72RQCh. 19 - Prob. 73RQCh. 19 - Prob. 74RQCh. 19 - Prob. 75RQCh. 19 - What are some of the basic methods that have been...Ch. 19 - Prob. 77RQCh. 19 - Prob. 78RQCh. 19 - Prob. 79RQCh. 19 - Prob. 80RQCh. 19 - Prob. 81RQCh. 19 - What properties from a uniaxial tensile test can...Ch. 19 - How is the formability in biaxial tension...Ch. 19 - What is normal anisotropy, R and planar...Ch. 19 - Prob. 85RQCh. 19 - Prob. 86RQCh. 19 - Prob. 87RQCh. 19 - Prob. 88RQCh. 19 - What two hot�forming operations can be used to...Ch. 19 - Prob. 90RQCh. 19 - What are the primary assets and limitations of...Ch. 19 - Prob. 92RQCh. 19 - Prob. 93RQCh. 19 - What are some of the attractive features of...Ch. 19 - What are some of the common types of press frames?Ch. 19 - What are some features that may be included into a...Ch. 19 - Prob. 97RQCh. 19 - Prob. 98RQCh. 19 - Prob. 99RQCh. 19 - Prob. 100RQCh. 19 - The maximum punch force in blanking can be...Ch. 19 - Prob. 2PCh. 19 - Prob. 3PCh. 19 - What are some of the techniques for minimizing the...Ch. 19 - Prob. 5PCh. 19 - Prob. 6PCh. 19 - Prob. 1CSCh. 19 - Prob. 2CSCh. 19 - Prob. 3CSCh. 19 - Polymeric materials have characteristically low...Ch. 19 - If adhesive bonding is specified as a replacement...Ch. 19 - Which of the material/process options do you feel...Ch. 19 - Prob. 7CSCh. 19 - Prob. 8CS
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- 1. Once you have overdesigned your product, you need to do a to match the needs and capabilities of your customers. 2. In 4-point bending, it has a higher probability that defects will exist due to a larger volume of a material subjected to a bending moment. True or false?arrow_forwardA flat metal sheet is bent into V shape using appropriate punch and die, both having included angle of 45 degrees. After the process it is found that the included angle of sheet is greater than 45 degrees. This phenomenon is known as: A-positive spring back C-plasticity V die of 0 = 45° 0>45° After process B-Negative spring back. D- Insufficient data.arrow_forward• A cylindrical billet that is 100 mm long and 40 mm in diameter is reduced by indirect (backward) Extrusion to a 15 mm diameter. Die angle = 90°. 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: (a) extrusion Ratio, (b) true strain (homogeneous deformation), (c) extrusion strain, (d) ram pressure, and (e) ram force.arrow_forward
- During a direct extrusion process for a billet with 5 in long and diameter 2.5 in to 1.6 in. For the work metal, strength coefficient is 75000 Ib/in, and strain hardening exponent is 0.4, also the die angle of extrusion is 90. In Johnson extrusion strain equation a = 0.8, and b= 1.5. Determine: (a) extrusion ratio (b) true strain (c) extrusion strain, and (d) ram pressure at length 5, 4.2, 2.3,1.5,and 0 in.arrow_forwardWhat is “Necking”? How does it lead to reduction in engineering stress as true stress increases?arrow_forwardWrite at least Three assumptions in the Theory of simple Bending. What do you mean by Fatigue Ratioarrow_forward
- Explain in your own words how the stress test (performance test) is applied to the patient turning apparatus shown in the figure, and guess how the expected result will be. The main part of the product consists of a polyurethane sponge. Stain-proof upholstery fabric will be used as the outer surface material. In addition, there are heating pads working with the logic of electric blankets in this apparatus, please answer by taking these into account when answering.arrow_forwardWhy are guidelines drawn on the surface of a free-bend specimen?arrow_forwardChapter 18: (USCS units) Aluminium rod stick with a starting diameter = 0.50 in 5) is drawn through a draw die with an entrance angle = 13°. The final diameter of the rod is = 0.375 in. The metal has a strength coefficient = 25,000 lb/in?. and a strain-hardening exponent = 0.20. Coefficient of friction at the work-die interface = 0.1. Determine the (a) area reduction, (b) draw force for the operation, and (c) horsepower o perform the operation if the exit velocity of the stock = 5 ft/sec.arrow_forward
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