The document discusses various types of rolling mills used to roll metals, including two high, three high, two high reverse, four high, multi, universal, and planetary rolling mills. It describes the basic setup and functions of two high, three high, two high reverse, four high, and cluster rolling mills. Additionally, it mentions tandem, universal, and planetary rolling mills as well as shape rolling operations like ring and thread rolling. Finally, it lists some common defects in rolled metal parts.

1. MANUFACTURING
TECHNOLOGY – I
CRAFTED BY:
RAMESH KUMAR A
Assistant Professor
Sona College of Technology
Salem
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2. ROLLING OF METALS
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3. TYPES OF ROLLING MILLS
Two high rolling mill
Three high rolling mill
Two high reverse rolling mill
Four high rolling mill
Multi rolling mill
Universal rolling mill
Planetary rolling mill
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4. TWO HIGH ROLLING MILL
Two rolls
Rolls rotate in a constant
direction
Both cold and hot working
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5. THREE HIGH ROLLING MILL
Three rolls
Upper and lower rolls are drive
rolls
Middle rolls rotates by friction
Rolling of two continuous
passes in a rolling sequence
without reversing the drive
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6. TWO HIGH REVERSIBLE ROLLING MILL
Rolls can rotate in both
direction
Reducing the handling of hot
metal in between the rolling
passes
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7. FOUR HIGH ROLLING MILL
It has a roll stand with four
parallel rolls one above the
other
The top and the bottom rolls
rotate in opposite direction as
do the two middle rolls
The two middle are smaller in
size than the top and bottom
rolls which are called backup
rolls for providing the necessary
rigidity to the smaller rolls
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8. CLUSTER ROLLING MILL
 It is a special type of four high
rolling mill in which each of the
two working rolls is backup by two
or more of the larger backup rolls
for rolling hard in materials
 It may be necessary to employ
work rolls of a very small diameter
but of considerable length
 In such cases adequate of the
working rolls can be obtained by
using a cluster mill
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9. TANDEM ROLLING MILL
 It is a set of two or three stands of
roll set in parallel alignment
 So that a continuous pass may be
made through each one
successively with change the
direction of material
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10. UNIVERSAL ROLLING MILL
 Metal is reduced to desired shape
by both horizontal and vertical
rolls
 Sheets, plates, slabs and beams
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11. PLANETARY ROLLING MILL
 Requiring large reduction
 Number of free rotating wheels
are fixed to a large backup roll
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13. SHAPE ROLLING OPERATIONS
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14. RING ROLLING PROCESS
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15. RING ROLLING PROCESS
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16. THREAD ROLLING PROCESS
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17. THREAD ROLLING PROCESS
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18. DEFECTS IN ROLLED PARTS
 Surface defects:
 Rust, scratches, cracks and pits
 Internal structural defects:
 Waviness, zipper cracks, edge cracks, alligatoring
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