Chapter 13 Rolling

Question 1

Rolling

Answer 1

is the process of reducing the thickness or changing the cross section of a long workpiece by compressive forces applied through a set of rolls

Question 2

anisotropic

Answer 2

A material that has different measured physical properties in different directions due to its grain structure

Question 3

No-slip point

Answer 3

neutral point or no-slip point, the velocity of the strip is the same as that of the roll. To the left of this point, the roll moves faster than the strip; to the right, the strip moves faster than the roll.

Question 4

Forward slip

Answer 4

is a measure of the relative velocities in the roll gap. Forward slip also correlates with the surface finish of the rolled strip, with low values being preferable to high values.

Question 5

draft

Answer 5

the difference between the final thickness and initial thickness during the rolling process

Question 6

crown and how do you fix it?

Answer 6

a result of roll deflections, the rolled strip will now be thicker at its center than at its edges

You can use rollers with a thicker diameter at the center known as a camber.

Question 7

how does tension effect rolling?

Answer 7

Applying tensions to the strip to reduce the roll pressure, as a result of which the compressive stresses required to plastically deform the material become smaller. Because they require high roll forces, tensions are particularly important in rolling of high-strength metals.

Question 8

barrel shaped or thermal camber

Answer 8

A problem that arises during rolling that happens due to the high heat. Rollers deforms creating a barrel shape which in turn produces sheets that have a thinner center width.