Chapter 3 - Rolling of metals

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Thickness measurement in continuous hot mill • In a continuous hot mill, the strip thickness is measured indirectly by measuring the rolling load and using the characteristic curve of the mill to establish the thickness. • The error signal is fedback to the rolling mill screws to reposition them so as to minimise the error. • An x-ray gauge is used after the last stand to provide an absolute measurement of sheet gauge. Suranaree University of Technology Tapany Udomphol Jan-Mar 2007
Thickness measurement in continuous cold strip mills • Thickness is measured by x-ray gauges while the error in the thickness following the first stand is usually fedback to adjust the gap sitting on the first stand. • Gauge control in subsequent stands usually is achieved by controlling the strip tension through controlling the relative roll speed in successive stands or the coiler speed. • Gauge control through control of strip tension has faster response time than control through change in roll setting. sensors Thickness gauging is achieved by using two opposing sensors with laser spots aimed at opposite sides of a target. The sensor readings are subtracted from the sensor separation distance to yield a real-time thickness measurement. Suranaree University of Technology Tapany Udomphol Jan-Mar 2007
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Rolling of metals Subjects of inter
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www.world-aluminium.org Introductio
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Sheet rolling machines Rolled strip
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Rolls Mill rolls Mill rolls Suranar
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Typical arrangement of rollers for
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Typical arrangement of rollers for
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Different types of rolling processe
Page 15 and 16: Transverse rolling • Using circul
Page 17 and 18: Shaped rolling or section rolling A
Page 19 and 20: Simulation of ring rolling Simulati
Page 21 and 22: Powder rolling Metal powder is intr
Page 23 and 24: Thread rolling Cut thread and rolle
Page 25 and 26: Example for hot strip mill process
Page 27 and 28: Cold-rolling Cold rolling www.willi
Page 29 and 30: Cold-rolling Cold rolling • Cold
Page 31 and 32: h o Forces and geometrical relation
Page 33 and 34: • At only one point along the sur
Page 35 and 36: h o v o p A R N B h f Friction hill
Page 37 and 38: Therefore Free engagement will occu
Page 39 and 40: Problem with roll flattening When h
Page 41 and 42: Simplified analysis of rolling load
Page 43 and 44: 2) Normal friction situation In the
Page 45 and 46: • Frictional force is needed to p
Page 47 and 48: 3) Sticky friction situation What w
Page 49 and 50: Relationship of µµµµ, rolling l
Page 51 and 52: Problems and defects in rolled prod
Page 53 and 54: Uniform thickness • Under high ro
Page 55 and 56: Flatness • The roll gap must be p
Page 57 and 58: • Hot mill can be provided with f
Page 59 and 60: Possible effects when rolls are ove
Page 61 and 62: • Edging can also be caused by in
Page 63 and 64: Rolling mill control • Modern con
Page 65: Rolling load P3 P2 P1 Situation whe
Page 69 and 70: The stresses acting on an element o
Page 71 and 72: The forces acting in the vertical d
Page 73 and 74: The rolling load or total force P i
Page 75 and 76: Torque and power Torque is the meas
Page 77 and 78: The torque M T is equal to the tota
Page 79: References • Dieter, G.E., Mechan
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Chapter 3 - Rolling of metals

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