Chapter 3 - Rolling of metals

Uniform thickness
• Under high rolling forces, the rolls flatten
and bend, and the entire mill is elastically
distorted.
• Mill spring causes the thickness of the
sheet exiting from the rolling mill to be
greater than the roll gap set under no-load
conditions.
• Precise thickness rolling requires the
elastic constant of the mill. Calibration
curves are needed, see Fig.
(1–3 GNm -1 for screw-loaded rolling mills, 4
GNm -1 for hydraulically loaded mills).
Suranaree University of Technology Tapany Udomphol
Jan-Mar 2007