EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 8220100793431
Author: KALPAKJIAN
Publisher: PEARSON
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Chapter 15, Problem 10RQ
What is land? What is its function in a die?
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The quantity of work that can be done in the die may be used as a defining feature of forging processes. Please identify the following three broad classes that this sorting generates.
6. In reverse drawing, the shape change is significant enough (e.g.,
drawing ratio greater than 2.0) that it must be carried out in two
drawing steps, probably with an annealing operation between the
steps. In redrawing drawing, two draws are accomplished on the
part, one in one direction, the second in the opposite direction (a)
true or (b) false
7. In semicentrifugal casting, a tubular mold is used and a tubular part
is produced. In true centrifugal casting, the shape is solid; an
example is a railway wheel. The mold is rotated so that centrifugal
force is used to distribute the molten metal to the exterior of the mold
so that the density of the final metal is greater at the outer sections
(a) true or (b) false
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.
Chapter 15 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
Ch. 15 - How does extrusion differ from rolling and...Ch. 15 - Explain the difference between extrusion and...Ch. 15 - What is a spider die? What is it used for?Ch. 15 - Why are wires sometimes drawn in bundles?Ch. 15 - What is a dead-metal zone?Ch. 15 - Define the terms (a) cladding, (b) dummy block,...Ch. 15 - Why is glass a good lubricant in hot extrusion?Ch. 15 - What types of defects may occur in (a) extrusion...Ch. 15 - Describe the difference between direct and reverse...Ch. 15 - What is land? What is its function in a die?
Ch. 15 - How are tubes extruded? Can they also be drawn?...Ch. 15 - Prob. 12RQCh. 15 - What is the difference between piping and...Ch. 15 - What is impact extrusion?Ch. 15 - What is the pipe defect in extrusion?Ch. 15 - List the similarities and differences between...Ch. 15 - Explain why extrusion is a batch, or...Ch. 15 - The extrusion ratio, die geometry, extrusion...Ch. 15 - Explain why cold extrusion is an important...Ch. 15 - What is the function of a stripper plate in impact...Ch. 15 - Explain the different ways by which changing the...Ch. 15 - Glass is a good lubricant in hot extrusion. Would...Ch. 15 - How would you go about avoiding center-cracking...Ch. 15 - Table 15.1 gives temperature ranges for extruding...Ch. 15 - Will the force in direct extrusion vary as the...Ch. 15 - Comment on the significance of metal flow patterns...Ch. 15 - In which applications could you use the type of...Ch. 15 - What is the purpose of the land in a drawing die?...Ch. 15 - Can spur gears be made by (a) drawing and (b)...Ch. 15 - How would you prepare the end of a wire in order...Ch. 15 - What is the purpose of a dummy block in extrusion?...Ch. 15 - Describe your observations concerning Fig. 15.9.Ch. 15 - Occasionally, steel wire drawing will take place...Ch. 15 - Explain the advantages of bundle drawing.Ch. 15 - Under what circumstances would backward extrusion...Ch. 15 - Why is lubrication detrimental in extrusion with a...Ch. 15 - In hydrostatic extrusion, complex seals are used...Ch. 15 - Describe the purpose of a container liner in...Ch. 15 - Estimate the force required in extruding 7030...Ch. 15 - Assuming an ideal drawing process, what is the...Ch. 15 - Prob. 41QTPCh. 15 - Calculate the extrusion force for a round billet...Ch. 15 - Prob. 43QTPCh. 15 - A round wire made of a perfectly plastic material...Ch. 15 - Assume that the summary to this chapter is...Ch. 15 - Prob. 47SDPCh. 15 - Figure 15.2 shows examples of discrete parts that...Ch. 15 - The parts shown in Fig. 15.2 are economically...Ch. 15 - Survey the technical literature, and explain how...Ch. 15 - Prob. 51SDPCh. 15 - List the processes that are suitable for producing...
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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
- QUESTION 16 Riser is a cavity connected to the gating system feeding the casting when it is shrinking. O True O False QUESTION 17 In a sheet-metal shearing operation (Punching) used to produce a flat part with a hole in the centre, the part itself is discarded and the piece that is cut out to make the hole is called a scrap. O True O False QUESTION 18 Pieces thicker than 5.45mm are considered sheet. O True O Falsearrow_forwardQ#01 : What is the difference between casting and forging process? Explain the three stages in casting process and its applications.arrow_forward. What types of Forming processes?arrow_forward
- A blanking operation is to be performed on 3.0 mm thick cold-rolled steel (half hard). The part is circular with diameter = 80.0 mm. Determine the appropriate punch and die sizes for this operation.arrow_forward1) A cup-drawing operation is performed in which: The cup's inside diameter = 75 mm and its height = 50 mm. %3D Stock thickness = 3.0 mm. %3D Punch and die radii = 4 mm. Tensile strength = 400 MPa for this sheet metal. %3D (a) Find the required starting blank size (b) Is this drawing operation feasible? (c) Determine the drawing force, and (d) Determine the blank-holder force.arrow_forwardA shell of 100 mm diameter and 100 mm height with the corner radius of 0.4 mm is to be produced by cup drawing. What is the required blank diameter?arrow_forward
- Q: what is the differance between casting and forging processs ? Explain the three stages in casting process and its application.arrow_forwardQ3 Give the reason for 10 of the following. - 1- The use of lubricant in wire drawing die. 2- The uses of tungsten carbide for the manufacturing of die tool. 3- The increase of Mo/Si ratio during the production of white cast iron. 4- The addition of Al to copper alloys. 5- Aluminum is a better overall conductor than Copper for long distance electric transformation. 6- The addition of cryolite in smelting electrical furnace due to the production of aluminum. 7- The addition of Magnesium and Cerium during the production of Ductile cast iron. 8- The addition of 13% Cr to steel in corrosive environment. 9- The increase of hardness for chips due to the cutting process. 10- The brittle fracture of steel at low temperature lower than -4 C. 11- The heating of metal after the rolling process.arrow_forwardIn a green sand moulding process, uniform ramming leads to (a) less chance of gas porosity (b) uniform flow of molten into the mould cavity C)greater dimensional stability of the casting (d) less sane expansion type of casting defectarrow_forward
- The term deep grinding refers to which .17 ?one of the following a) alternative name for any creep feed Grinding) O operation b) external cylindrical creep feed grinding) O c) grinding operation performed at the bottom of a) O ,hole ,d) surface grinding that uses a large crossfeed) O e) surface grinding that uses a large infeed) Oarrow_forward4. What are the advantages and limitations of using die inserts?arrow_forward(USCS units) A part is hot forged in an impression die. The projected area of the part, including flash, = 17.3 in2. After trimming, the part has a projected area of 12.5 in2. Part geometry is complex. As heated the work metal yields at 13,000 lb/in2and no strain hardening occurs. At room temperature, the metal yields at 30,000 lb/in2. Determine the maximum force required to perform the forging operation. (use table 18.1 for Kf )arrow_forward
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