Page 353 - 04. Subyek Engineering Materials - Manufacturing, Engineering and Technology SI 6th Edition - Serope Kalpakjian, Stephen Schmid (2009)

Qualitative Problems 333

KEY TERMS

Alligatoring Flat rolling Ring rolling Slab
Back tension Foil Roll Spreading
Billet Front tension Roll forging Stand
Bloom Gage number Roll stand Steckel rolling
Camber Hot rolling Rolling Tandem rolling
Cast structure Mannesmann process Rolling mill Temper rolling
Chatter Minimill Rotary tube piercing Thread rolling
Cogging mill Neutral point Sendzimir mill Tube rolling
Cold rolling Pack rolling Shape rolling Wrought structure
Crown Pilger mill Sheet
Draft Plate Skew rolling

BIBLIOGRAPHY

Ginzburg, VB., High-Quality Steel Rolling: Theory and Lee, Y., Rod and Bar Rolling: Theory and Applications. CRC
Practice, Marcel Dekker, 1993. Press, 2004.
Ginzburg, VB., and Ballas, R., Flat Rolling Fundamentals, Lenard, ].G., Primer on Flat Rolling, Elsevier, 2007.
CRC Press, 2001. Tschaetch, H., Metal Forming Practice: Processes, Machines,
Hosford, WE, and Caddell, R.M., Metal Forming: Mechanics Tools, Springer, 2007.
and Metallurgy, 3rd ed., Prentice Hall, 2008.
Lange, K. (ed.), Handbook of Metal Forming, McGraw-Hill,
1985.

REVIEW QUESTIONS

l3.l. What is the difference between a plate and a sheet? l3.7. List the defects commonly observed in flat rolling.
|3.2 Define (a) roll gap, (b) neutral point, and (c) draft. l3.8. What are the advantages of tandem rolling? Pack
rolling?
l3.3 What factors contribute to spreading in flat rolling?
|3.9. How are seamless tubes produced?
l3.4 Explain the types of deflections that rolls undergo.
l3.l0. Why is the surface finish of a rolled product better in
l3.5 Describe the difference between a bloom, a slab, and
cold rolling than in hot rolling?
a billet.
|3.l I. What is a Sendzimir mill? What are its important
I3.6. Why may roller leveling be a necessary operation? features?

QUALITATIVE PROBLEMS

|3.l2. Explain why the rolling process was invented and l3.| 7. Explain how you would go about applying front and
developed. back tensions to sheet metals during rolling. How would you
l3.l3. Flat rolling reduces the thickness of plates and go about controlling these tensions?
sheets. It is possible, instead, to reduce their thickness simply l3.l8. What typically is done to make sure that the product
by stretching the material? Would this be a feasible process? in flat rolling is not crowned?
Explain.
l3.l9. Make a list of some parts that can be made by (a)
I3.l4. Explain how the residual stress patterns shown in shape rolling and (b) thread rolling.
Fig. 13.9 become reversed when the roll radius or reduction-
l3.20. Describe the methods by which roll flattening can be
per-pass is changed.
reduced. Which property or properties of the roll material
l3.l5. Explain whether it would be practical to apply the can be increased to reduce roll flattening?
roller-leveling technique shown in Fig. 13.7a to thick plates.
l3.2|. In the chapter, it was stated that spreading in flat
l3.l6. Describe the factors that influence the magnitude of rolling increases with (a) a decreasing width-to-thickness
the roll force, F, in Fig. 13.2c. ratio of the entering material, (b) decreasing friction, and