Chapter 3 - Rolling of metals

P
Q
Theory of hot-rolling hot rolling
In hot working processes, the flow stress for hot-rolling is a function of
both temperature and strain rate (speed of rolls)
Calculation of rolling load by Sims
= σ b
'
o
[ ( ) ]
1
R ho
− h 2
f Q p
Where Q p is a complex function of
the reduction in thickness and the
ratio R/h f . Values of Q p may be
obtained from
p
=
…Eq.20
2
h ⎡
⎤
o
−1
∆h
R hn
π
⎢π
tan − ln ⎥ −
4∆h
⎢⎣
h f h f hoh
f ⎥⎦
4
…Eq.21
Suranaree University of Technology Tapany Udomphol
Jan-Mar 2007