Chapter 3 - Rolling of metals

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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
Torque and power Torque is the measure of the force applied to a member to produce rotational motion. Power is applied to a rolling mill by applying a torque to the rolls and by means of strip tension. The power is spent principally in four ways 1) The energy needed to deform the metal. 2) The energy needed to overcome the frictional force. 3) The power lost in the pinions and power-transmission system. 4) Electrical losses in the various motors and generators. Remarks: Losses in the windup reel and uncoiler must also be considered. 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
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Transverse rolling • Using circul
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Shaped rolling or section rolling A
Page 19 and 20:
Simulation of ring rolling Simulati
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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 and 66: Rolling load P3 P2 P1 Situation whe
Page 67 and 68: Thickness measurement in continuous
Page 69 and 70: The stresses acting on an element o
Page 71 and 72: The forces acting in the vertical d
Page 73: The rolling load or total force P i
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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