Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 15, Problem 12RQ
To determine
Explain whether helical gears can be extruded like straight gears through extrusion process or not.
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A 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. if The aluminum sheet metal
has a tensile strength = 310 MPa, a
strength coefficient of 350 MPa, and a
strain-hardening exponent of 0.12. (a)
Assume that blanking and punching occur
simultaneously. (b) Assume the punches
are staggered so that punching occurs
first, then blanking. Determine (1) the
punch and die sizes for the blanking
operation, and (2) the punch and die sizes
for the punching operation.(3) the
minimum tonnage press to perform the
blanking and punching operation
The rim of a steel flywheel 1 m diameter and 200 mm wide is rotating at 2400 rpm. Calculate:
(a) The hoop stress developed.
(b) The shrinkage in the width of the rim
(c) The extension of the circumference due to rotation.
(d) The speed in rpm at which the rim will burst
Material density is 7850 kg/m; Poisson's ratio is 1/3; Young's Modulus is 200 GPa; Yield stress is 400
MPa.(126.4MPA; 0.042 mm; 1.98 mm; 4270 rpm]
The height of the down sprue is 175 mm and its CS are at the base is 200 mm² The CS area of the horizontal runner is also 200 mm² Assuming no losses, indicate the correct choice for the time (second) required to fill a mould cavity of volume 106 mm³ (Use g=10 m/s^ 2 )
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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- Asaparrow_forwardA compound die will be used to blank and punch a large rectangle (90x150mm blank dimensions) out of 6061ST aluminum alloy sheet stock 3.5 mm thick. The diameter of inside hole is 25 mm. The aluminum sheet metal has a tensile strength 310 MPa. Determine the minimum tonnage press (force) to perform the blanking and punching operation (1) assume that blanking and punching occur simultaneously and (2) assume that punching occurs first, then blanking, Take: Ac-0.06arrow_forwardCalculate (1) die pressure distribution and (2) forging force for plane strain forging (open die forging). Assume yield strength of the material is Y, and yielding criterion is von Mises. ho 2Lo h Forged to 2L xdx L 'x+value Note: Assume Zo Constant Plane strain Die pressure distribution h L L Die pressure distribution h MATERIAL L dx -(-1) Friction Hill Y L When 0; =Y P=Y' = Calculate forging force X L dF elemental volume Average pressurearrow_forward
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