Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 15, Problem 41QTP
To determine
If friction is included in problem 15.40, will there be any difference in the final diameter. Discuss.
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Question 1
solid cylindrical work piece is reduced in height by an open die forging process using flat dies on a mechanical press, powered by a 20 kW motor which operates at 35 strokes per minute with a stroke length of 160 mm. The work piece is 60 mm high and 100 mm in diameter and is to be reduced in height by 15%. The coefficient of friction during the operation is 0,18. Calculate the flow stress of work piece material if the press is set to operate at 90% of its maximum capacity.
Explain in detail the different types of friction?
2) 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.
Chapter 15 Solutions
Manufacturing Engineering & Technology
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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- A solid cylindrical work piece is reduced in height by an open die forging process using flat dies on a mechanical press, powered by a 20 kW motor which operates at 35 strokes per minute with a stroke length of 160 mm. The work piece is 60 mm high and 100 mm in diameter and is to be reduced in height by 15%. The coefficient of friction during the operation is 0,18. Calculate the flow stress of work piece material if the press is set to operate at 90% of its maximum capacity.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_forwardExplain (i) Angle of repose with a Neat diagram (ii) Impending Motion and Limiting Frictionarrow_forward
- * 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.arrow_forwardWhat is friction?arrow_forwardExplain the main objective of the Dimensioning of a Cylindrical Press Fit Joint. Emphasize on the role of the surface pressure.arrow_forward
- Differentiate between dry friction and internal friction ?arrow_forwardIn a rolling mill, the rollers can exert a pressure of 219 MPa on the sheet being rolled. If the friction coefficient between the roller and the sheet metal is 0.35 and the flow stress of the steel being rolled is 120 MPa, what diameter rolls would reduce the thickness of 2mm thick sheet by 25% in a single pass?arrow_forwardDefine the term friction. Explain about static friction and dynamic friction with examples?arrow_forward
- In a rolling operation using a roll of diameter 1.5 m, if a 35 mm thick plate cannot be reduced to less than 12 mm in a single pass then calculate the coefficient of friction btween the rolls and the plate.arrow_forward6.100 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.arrow_forwardA 10 mm thick plate is rolled to 7 mm thick in a rolling mill using 1000 mm diameter rigid rolls. The neutral point is located at an angle of 0.3 times the bite angle from the exit. What will be the thickness of the plate at the neutral point.arrow_forward
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