Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
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Chapter 18, Problem 5P
To determine
The region in direct extrusion to measure the
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A process currently services an average of
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Manufacturing Processes
Q1. Chose the correct answer:
1. Which of the following are variations of sheet-metal-bending operations: (a) coining, (b) flanging, (c)
hemming, (d) ironing, (e) notching, (f) shear spinning, (g) trimming, and (h) tube bending?
2. Springback in a sheet-metal-bending operation is the result of which one of the following: (a) elastic
modulus of the metal, (b) elastic recovery of the metal, (c) overbending, (d) overstraining, or (e) yield strength
of the metal?
3. The cutting force in a sheet-metal blanking operation depends on which mechanical property of the metal
(one correct answer): (a) compressive strength, (b) modulus of elasticity, (c) shear strength, (d) strain rate, (e)
tensile strength, or (f) yield strength?
4. A circular sheet-metal slug produced in a hole punching operation will have the same diameter as (a) the
die opening or (b) the punch?
5. As sheet-metal stock hardness increases in a blanking operation, the clearance between punch and die should…
Chapter 18 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 18 - Briefly describe the evolution of forming...Ch. 18 - What are some of the possible means of classifying...Ch. 18 - How are bulk deformation processes different from...Ch. 18 - Prob. 4RQCh. 18 - Prob. 5RQCh. 18 - Prob. 6RQCh. 18 - Prob. 7RQCh. 18 - Why is it undesirable to minimize friction between...Ch. 18 - Prob. 9RQCh. 18 - Prob. 10RQ
Ch. 18 - Prob. 11RQCh. 18 - Prob. 12RQCh. 18 - Prob. 13RQCh. 18 - Prob. 14RQCh. 18 - Why is foil almost always rolled on a cluster...Ch. 18 - Prob. 16RQCh. 18 - Prob. 17RQCh. 18 - Prob. 18RQCh. 18 - Prob. 19RQCh. 18 - Explain how hot�rolled products can have...Ch. 18 - What is mill scale, and how can it be removed?Ch. 18 - Discuss the problems in producing uniform...Ch. 18 - Prob. 23RQCh. 18 - How might the addition of horizontal tensions act...Ch. 18 - What are some other techniques to reduce roll...Ch. 18 - What is thermomechanical processing, and what are...Ch. 18 - Provide a concise description of the forging...Ch. 18 - What are some of the types of flow that can occur...Ch. 18 - Prob. 29RQCh. 18 - Prob. 30RQCh. 18 - Prob. 31RQCh. 18 - Prob. 32RQCh. 18 - Prob. 33RQCh. 18 - Prob. 34RQCh. 18 - Prob. 35RQCh. 18 - Prob. 36RQCh. 18 - Prob. 37RQCh. 18 - Prob. 38RQCh. 18 - Prob. 39RQCh. 18 - Describe some of the primary differences among...Ch. 18 - What are some common examples of impression�die...Ch. 18 - What are some of the significant requirements of...Ch. 18 - Why are different tolerances usually applied to...Ch. 18 - What are some of the roles played by lubricants in...Ch. 18 - What are some of the attractive features of...Ch. 18 - What types of product geometry can be produced by...Ch. 18 - What is upset forging?Ch. 18 - What are some of the typical products produced by...Ch. 18 - What types of products can be produced by...Ch. 18 - What are some of the attractive features of...Ch. 18 - How does roll forging differ from a conventional...Ch. 18 - Describe the swaging process.Ch. 18 - What kind of products are produced by swaging?Ch. 18 - How can the swaging process impart different sizes...Ch. 18 - What are some possible objectives of...Ch. 18 - Provide a concise definition of extrusion.Ch. 18 - What metals can be shaped by extrusion?Ch. 18 - What are some of the attractive features of the...Ch. 18 - What is the primary shape limitation of the...Ch. 18 - What is the primary benefit of indirect extrusion?Ch. 18 - What are some temperature considerations in hot...Ch. 18 - Why might lubricant selection be more critical in...Ch. 18 - What are some possible causes of surface cracks in...Ch. 18 - How might tubular products be made by extrusion?Ch. 18 - What types of products are made using a...Ch. 18 - Why can lubricants not be used in spider�mandrel...Ch. 18 - What are some of the attractive features of...Ch. 18 - What are some unique concerns and limitations of...Ch. 18 - What is the unique capability provided by...Ch. 18 - How is the feedstock pushed through the die in...Ch. 18 - Describe the Conform process of continuous...Ch. 18 - What types of feedstock can be used in continuous...Ch. 18 - How is wire, rod, and tube drawing different from...Ch. 18 - Why are rods generally drawn on draw benches,...Ch. 18 - Why is the reduction in area significantly...Ch. 18 - What is the difference between tube drawing and...Ch. 18 - For what types of products might a floating plug...Ch. 18 - What are some of the benefits of cold drawing of...Ch. 18 - What types of materials are used for...Ch. 18 - What is the benefit of a tandem wire drawing...Ch. 18 - What is cold forming?Ch. 18 - What types of products are produced by cold...Ch. 18 - What is impact extrusion and what variations...Ch. 18 - If a product contains a large�diameter head and...Ch. 18 - What are some of the attractive properties or...Ch. 18 - What process can be used to produce seamless pipe...Ch. 18 - What type of products can be made by the...Ch. 18 - What types of rivets can be used when there is...Ch. 18 - How is coining different from a process known as...Ch. 18 - Why might hubbing be an attractive way to produce...Ch. 18 - How might a peening operation increase the...Ch. 18 - What is burnishing?Ch. 18 - Prob. 1PCh. 18 - Consider the extrusion of a cylindrical billet,...Ch. 18 - The force required to compress a cylindrical solid...Ch. 18 - Prob. 4PCh. 18 - Prob. 5PCh. 18 - Prob. 6PCh. 18 - Prob. 7PCh. 18 - Prob. 8PCh. 18 - Based on the size, shape, and desired precision,...Ch. 18 - What types of engineering materials might be able...Ch. 18 - For each of the shape generation methods in part...Ch. 18 - Which of the combinations of part 4 do you feel...Ch. 18 - For this system, outline the specific steps that...Ch. 18 - For your proposed solution, would any additional...
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- Question 2. It is reduced to 80 mm with forging by stacking a part with a height of 120 mm and a diameter of 75 mm. The friction coefficient between the workpiece and the mold is 0.13. The flow curve of the workpiece is defined by a strength coefficient of 165 MPa and a ping-top of 0.24. Calculate the force during the process at the moments given below and obtain the force-workpiece height graph (1) as soon as it reaches the flow point (flow unit shape change = 0.002), (2) height h = 115 mm, (3) height h = 110 mm, (4) height h = 105 mm, (5) height h = 100 mm, (6) height h = 95 mm, (7) height h = 90 mm, (8) height h = 85 mm, (9) height h = 80 mm,arrow_forwardShow steps, thank youarrow_forwardShow full solution and in 4 significant figuresarrow_forward
- Is force a vector or scaler quantity?arrow_forwardQ1) The redesigned brake caliper is manufactured using SLM from Titanium Ti6Al-4V alloy powder. How many SLM machines are required to manufacture parts for 450 vehicleswhich are to be built in a 20-month production period. The following parameters are in effect:• A single caliper is built at a time• The caliper has a height of 173mm.• Each layer is 32 µm thick• Only one laser is used• The average laser scanning time for each layer with a single laser is 63 seconds• The powder recoating time for every odd numbered layer is 12 seconds and 25 for every evennumbered layer• Every 8th layer is scanned twice, at 2.3 times the usual laser scan speed to provide additional heatinput for in-situ heat treatment• The SLM machine operates at a duty rate of 42% of the 24-hour day, Monday to Friday, for 48 weeksof the year, with 10% of production time lost to unscheduled downtime.arrow_forwardSuppose that a company that works in extruding aluminium products has spent L.E. 50,000 on maintenance materials, L.E. 10,000 on maintenance labour, L.E. 250,000 on manufacturing; in order to produce 10,000 tons of extruded aluminium sections. If the total man-hours worked is 1,000 man-hour, the total cost of investment in the plant and equipment is L.E. 5E06, and the preventive and breakdown maintenance costs are L.E. 40,000 and L.E. 20,000, respectively, find the following: a) The ratio of maintenance labour cost to material cost. b) The ratio of total maintenance cost to total output. c) The ratio of total maintenance cost to total manufacturing cost. d) The ratio of total maintenance cost to total man-hours worked. e) The ratio of total maintenance cost to value of facility. f) The ratio of total preventive maintenance cost to total breakdown cost.arrow_forward
- 1. Die casting is the process where molten metal is force into the die cavity at high pressures. There are two types of die casting; hot camber process and cold chamber process. Please describe and draw the schematic illustration to represent each of them. 2. a) Flat rolling reduces the thickness of plates and sheets. It is possible, instead, to reduce their thickness simply by stretching the material? Would this be a feasible process? Explain. b) Defects may be present on the surfaces of rolled plates and sheets, or there may be internal structural defects. Defects are undesirable not only because they adversely affect surface appearance, but also because they may affect strength, formability, and other manufacturing characteristics of the rolled sheets. Describes the typical defects in flat rolling by providing the schematic illustration for each of them.arrow_forwardA compound die will be used to blank and punch a large washer out of 6061ST aluminum alloy sheet stock 3.50 mm thick. The outside diameter of the washer is 50.0 mm and the inside diameter is 15.0 mm. Determine (a) the punch and die sizes for the blanking operation, and (b) the punch and die sizes for the punching operation Vallue for allowance = 0.060arrow_forwardA hydraulic press is used to apply 500 lbs of force to press fit an assembly. The cylinder has a 2" piston and 1.5" rod, and a 16" stroke length. What flow rate (in gpm) is required to retract the press in 0.75 seconds?Answer: 7.6 ± 1.arrow_forward
- 3XPL@!N THE PROCESS @ND PROVIDE EXAMPLES FORMING OPERATIONS 1. Forging is mechanically working or deforming a single piece of a usually hot metal; this may be accomplished by the application of successive blows or by continuous squeezing. 2. Rolling, the most widely used deformation process, consists of passing a piece of metal between two rolls; a reduction in thickness results from compressive stresses exerted by the rolls. 3. Extrusion, a bar of metal is forced through a die orifice by a compressive force that is applied to a ram; the extruded piece that emerges has the desired shape and a reduced cross-sectional area. 4. Drawing is the pulling of a metal piece through a die having a tapered bore by means of a tensile force that is applied on the exit side.arrow_forwardAnswer is Around 5.8lb [diagram must be drawn] An automobile weighing 3900 lbs has 29-inch diameter wheels. Assuming the coefficient of rolling resistance between the tires and the road of 0.02 inch, determine the force necessary to overcome rolling friction on a level road. Answer should be in lbsarrow_forwardThe ABC Company is planning a new product line and a new plant to produce the partsfor the line. The product line will include 8 different models. Annual production of eachmodel is expected to be 900 units. Each product will be assembled of 180 components.All processing of parts will be accomplished in the new plant. On average, 6 processingoperations are required to produce each component, and each operation takes an averageof 1 min (including an allowance for setup time and part handling). All processing operationsare performed at workstations, each of which includes a production machine and ahuman worker. The plant operates one shift. Determine the number of (a) components, (b)processing operations, and (c) workers that will be needed to accomplish the processingoperations if each worker works 2,000 hr/yr.arrow_forward
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