1. What are the reasons why the bulk deformation processes are important commerc

Question

1. What are the reasons why the bulk deformation processes are important commercially and technologically? 2. Name the four basic bulk deformation processes. 3. What is rolling in the context of the bulk deformation processes? 4. In rolling of steel, what are the differences between a bloom, a slab, and a billet? 5. List some of the products produced on a rolling mill. 6. What is draft in a rolling operation? 7. What is sticking in a hot rolling operation? 8. Identify some of the ways in which force in flat rolling can be reduced. 9. What is a two-high rolling mill? 10. What is a reversing mill in rolling? 11. Besides flat rolling and shape rolling, identify some additional bulk forming processes that use rolls to effect the deformation.

Explanation / Answer

1) a) Capable of significant shape change when hot working is used.
b) Positive effect on part strength when cold working is used.

c) Most processes include little material waste and they are net shape processes

2) Rolling, forging, extrusion and wire and bar drawing.

3) When slab's or plate's thickness is reduce by compression in between opposing rolls.

4) A bloom is a rolled steel workpiece with a square cross section of about 150 mm by 150 mm. The starting work unit for a bloom is an ingot heated in a soaking pit. A slab is rolled from an ingot or a bloom and has a rectangular cross section of about 250 mm by 40 mm. A billet is rolled from a bloom and has a square cross section of about 40 mm by 40 mm.

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