Cylindrical Roller Bearings
for Multi-roll Mill Backup Rolls

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CAT.NO.BA015EN-1MY,,
Printed in Japan 23.03（ 04.07）

CAT.NO.BA015EN-1MY

JTEKT started producing cylindrical roller bearings for backup rolls for Sendzimir
mills in the 1950s and has continued to provide superior products for customers
around the world.
As regards to the backup rolls assembling products, which is the Key component of
the Sendzimir mill, we concluded a production agreement for licensing with SENDZIMIR JAPAN, LTD. in 1970 and now supply over 100 products for Sendzimir mills aroundthe world.
We support our customer’s operations stability not only with cylindrical roller bearings for backup rolls, but with cylindrical roller thrust bearings for work rolls , bearing-regrinding jigs, measurement of the bearing’s section height with equipment
developed at JTEKT and our technical know-how and experience.
JTEKT has a long history of providing high quality products and the experience tooffer products with high durability and reliability.

Multi-roll mills enable our customers to utilize extremely small diameter workrolls with a choice of 12 or 20 rolls. Thereby, we are now capable of rolling hardmaterials such as stainless steel sheets and electrical steel sheets as well as
rolling ultrathin copper. Cylindrical roller bearings for backup rolls play a significant role in obtaining this high level of efficiency.
Photo by: SENDZIMIR JAPAN, LTD.
01

02

Cylindrical roller bearings for multi-roll mill backup rolls
Long life, highly corrosion-resistant JHS is driving innovations in steel production equipment.

JTEKT has provided Cylindrical roller bearings for backup rolls with highdurability and precision, contributing to the utmost performance inmulti-roll mills.

Iron manufacturing and rolling mill lines must operate continuously while maintaining high reliability in severe production
environments. Answering these needs through the realization of epoch-making long-life and high corrosion resistance is
JTEKT Hyper Strong (JHS). By adopting newly developed materials and processes for bearing steel, seal materials and othercomponents, we have realized a 2-to-4-fold increase in bearing service life compared to previously used bearings. Continuingon from JHS520 for rolling mill roll necks and JHS210 for Sendzimir rolling mill backup rolls, we are steadily expanding thebearing series according to each application. The JHS bearing series offers total support for achieving maximum performanceand durability in the ever-evolving field of steel equipment. Please keep your expectations high. We won't let you down.

Required performance and issues
Seal structure that maintains a favorable lubricated state
Improving outer ring durability

Seal structure that maintains a favorable lubricated state

Longer inner ring rolling fatigue service life

Improving outer ring rotational accuracy

Improving ease of outer ring regrinding work (P15-16)

Improving outer ring durability

Bearing for oil mist lubrication
Advantages

Bearing configuration and features

Longer inner ring rolling fatigue service life

The bearings which are used for multi-roll mill backup rolls are attached to the rolls on 1 shaft and the bearings outer diameter are fit closely tothe intermediate roll which rotates while loading the rolling component force. Therefore, the outer ring must be fabricated having sufficient rigidityand fatigue strength as well as high precision. At JTEKT, we assemble the bearings in a specially controlled clean working environment.

Rubber mold on outercircumference of seal plate（Minimal clearance)

・Improving bearing service life
(2-fold/4-fold compared to conventional types)
・High sealing performance・Oil seal’s Space-saving size for simple
installation/ removal
・Reducing cleaning time at regular maintenanceby 80％ (according to JTEKT research)

96% reductionof water andforeign matter
intrusion
Rubber mold on innerdiameter of seal plate(Close contact with theinner ring fitting part)【Service life】● The outer surface of the bearing is manufactured through crowning, which accounts
for the contact stress distribution to prevent damage to the intermediate roll due toedge load.

Conventional type

Approx.

Crowned outside surface
Uncrowned outside surface
Typical contact stress distribution of the outer-ring’s outside surface(Refer to P16 for the dimensions of the outer ring crowning)

Improving outer ring rotational accuracy

2-foldApprox.

Conventional type

Developed typeA large amount of foreign matteraccumulated inside the seal plate

Almost no foreign matter accumulation

JHS210 (standard specification)

4-foldJHS210 (premium specification)

Premium specifications● By ensuring that high precision in both the variation of the bearing’s section heights
and high rotation accuracy is achived for optimum distribution of the bearing loads
and supporting the development in rolling precision and the quality of the coils.

Case-hardened steel is used for the inner ring tosuppress the loss of rolling service life under
low-viscosity lubrication. Bearing service life isapprox. 4-fold compared to the conventional
type.

Variation of bearing section heights on one shaft ≦0.006mm
Variation between two adjacent bearings
on one shaft ≦0.002mm

Longer inner ring rolling fatigue service life

Improving outer ring durability

Improving outer ring rotational accuracy

Bearing for forced oil lubrication
Shaft (backing shaft)

Bearing for backup rolls

Cored hardening【Macroscopic structure】
Carburized Steel

60

Developed steel

03

Approx.

Hardness
HRC
40

Carburized SteelApprox.

Conventional type

Developed steel【Surface-hardened layer】※Cored hardening isapplied to bearingsof over 130mm innerdiameter.

3-fold・Outer ring with both high rigidity and durability realized・High resistance to fatigue realized owing to superior materials composition

・Design optimized to match surrounding structure【Service life】

Surface-hardened layer improved approximately 3-fold● Outer ring is fabricated by
JTEKT original developed
steel and cored hardening.

Advantages

Premium specifications

Carburized SteelDeveloped steel

Outside surface Measured positions

1.5〜3-foldBore surface

JHS210 (premium specification)

Case-hardened steel is used for the inner ring tosuppress the loss of rolling service life under
low-viscosity lubrication. Bearing service life isapprox. 1.5~3-fold compared to the conventional type.

Typical hardness distribution of cored hardening outer ring04

Bearing instruction
Here is an illustration of how we disassemble, assemble and inspect the bearings. Please follow this for bearing maintenance.

Oil seal disassembling points

Oil seal inspection points

Snap ring (2 pieces)

Bearing for oil mist lubrication

Shield (2 pieces)

Oil seal (2 pieces)

Cage (2 pieces)
Roller (2 rows)

Confirm no cracking or chipping on seal lip part【！】Caution
In case of cleaning the oil seal with cleaning oil, please wipe off thecleaning oil immediately.

Roller・Cage disassembling points

Inner ring (2 pieces)

Outer ring (1 piece)(2) Remove snap ring (both pieces)(3) Remove oil seals (both pieces)【！】Caution
Be careful to not scratch the oil seal when removing the snap ring and oil
seal.

※ Please use 10-40kPa for oil mist manifold pressure.

Roller inspection points
Confirm no abrasion
Confirm no discoloration
due to temperature rise

Inner ring disassembling points

Confirm no cracking or
chipping

Inner ring inspection points
Confirm for no axial
scratches on raceway

Confirm no rust

Confirm no discoloration due to temperature raise

Confirm no rust(4) Hold the cage and remove it with the roller (both rows)【！】Caution
Be sure to keep all rollers and other parts separate from other bearing
parts and manage each bearing independently.

Outer ring inspection points

Confirm no abrasion
on rib face

Confirm no cracking or
chipping

Confirm no discoloration
due to temperature rise
Confirm no rust

(1) Remove inner rings (both rings)
Shield will be removed with inner rings due to the press-fitting of theinner ring.
【！】Caution
Be careful when handling the shield. Any damage to shield may affect theperformance of the bearing’s sealing.

05

Confirm no slipping
scratches or brinelling

Confirm that race way has no unbalanced,
asymmetrical roller contact marks on both rows.

Confirm that race way has
no unbalanced, asymmetrical roller contact markon both rows
Confirm no abrasion on
rib face06

Bearing instruction
Here is an illustration of how we disassemble, assemble and inspect the bearings. Please follow this for bearing maintenance.

Roller・Cage disassembling points

Roller inspection points

Assembling cylindrical roller bearings for backup rolls

Confirm no cracking or
chipping

Confirm no discoloration
due to temperature rise

(1) Complete cleaning of each part before re-assembling.
(2) Assemble the bearings in the reverse order of disassembling.
(3) Before inserting the inner ring (with shield), supply the initial lubricate oil(mist oil) into the bearing.

(2) Hold the cage and remove it with roller (2 rows and 1 row)【！】Caution
Be sure to keep all rollers and other parts separate from other bearing
parts and manage each bearing independently.

【！】Caution
・Be careful to insert only appropriate bearing parts. There are no compatible parts withother products.
・During re-assembly, be careful not to contaminate the bearing with any foreign
matter. Please handle with care so as not to scratch any surfaces of the bearing.

Confirm no rust

Confirm no abrasion

Outer ring inspection points
Cage (2 pieces)
Guide ring (2 pieces)(Cage’s bore surface side)

Bearings for forced oil lubrication
Roller (3 rows)

Inner ring (1 piece)

Inner ring inspection points
Confirm there are no axial scratcheson the raceway(1) Remove inner ring (1 piece)

07

Confirm no cracking or
chipping
Confirm no discoloration
due to temperature rise

Outer ring (1 piece)

Inner ring disassembling points

Confirm no slipping
scratches or brinelling

Confirm no rust

Confirm no discoloration
due to temperature rise

Confirm no rust

Confirm that race way has
no unbalanced, asymmetrical roller contact markon 3 rows

Assembling cylindrical roller bearings for backup rolls(1) Complete cleaning of each part before re-assembling(2) Assemble the bearings in the reverse order of disassembling【！】Caution
・Be careful to insert only appropriate bearing parts. There are no compatible parts
with other products.
・During re-assembly, be careful not to contaminate the bearing with any foreign
matter. Please handle with care so as not to scratch any surfaces of the bearing.

Confirm that race way has no
unbalanced, asymmetrical roller
contact mark on 3 rows

08

Examples of bearing failures and countermeasures
JTEKT’s countermeasures for various failures. Please follow this bearing maintenance program for optimum performance.

Raceway・roller flaking
Outside surface of outer ring’s slipping scratches and grinding burnTranscription mark on intermediate roll
＜Probable causes＞･Improper regrinding of outerring(Clogged grinding stone)→rough outside surface(include scratches and foreign
matter)→occurrence of transcription
mark on intermediate roll＜Countermeasures＞･Optimizing grinding conditions,improving grinding stone andcleaning outside surface andshaft＜Countermeasures＞･Reusable by grinding outside
surface･Reusable by grinding intermediateroll＜Probable causes＞･Slip with the intermediate roll
(Sheet jam, involution and so on)＜Countermeasures＞･Review operating conditions＜Countermeasures＞･After removing the slipping scratcheson outer surface of the outer ring, aminimum of 0.5mm re-grinding on
Outside of outer ring’s slipping scratches outer ring diameter needs to be
done.
Transcription

Transcription
mark on intermediate roll
Outside of outer ring’s slipping scratches
Outside of outer ring’s grinding burn＜Probable causes＞･Improper regrinding of outer ring
(Heavy grinding, lack of grinding fluid, clogged grinding stone, etc.)＜Countermeasures＞･Optimizing the grinding conditions, improving grinding stone＜Countermeasures＞･dispose

Brinelling on raceway

Expansion of crowning parton outer ring O.D.

Rough surface ofouter ring O.D.

Raceway ring’s cracking

Rust・scratches
Rust

Raceway flaking

Roller flaking＜Countermeasures＞･After use, disassemble andclean as soon as possible･perform rust prevention
maintenance･confirm the seals condition＜Countermeasures＞･Reusable by lapping using＜Probable causes＞･After use, equipment has been left for a long oil grinding stone or
sandpaper
period without disassembling･In case of severe condition,
・Improper storage condition
dispose・Intrusion of mill water
Scratches＜Probable causes＞･Rolling fatigue service life, excessive loading, improper lubrication＜Countermeasures＞･Review operating conditions･Review viscosity of oil lubrication＜Countermeasures＞･dispose
However, in the case of minimal flaking of the inner ring, it’s reusable byremoving the flaking and setting in an unloading position＜Probable causes＞･Scratches during bearing’s disassemblingor re-assembling

Smearing or abrasions

Raceway wear

Roller Smearing
Brinelling on outerring O.D.
Slipping scratches(see above)
Outer ring cracking
Brinelling on raceway
surface of outer ring

＜Probable causes＞･Foreign matter jam (rolling material’s fragmentation, etc.)＜Countermeasures＞･Rolling oil cleaning＜Countermeasures＞･Reusable by regrinding outside surface. Reusable by lapping raceway
surface. However, if damage is too severe, dispose

09＜Probable causes＞･Outside surface damage progresses from slipping scratches.
･Side surface damage progresses from heat cracks (due to slipping withthrust washer.)＜Countermeasures＞･Remove the slipping scratch by regrinding the outer ring O.D.
･Proper management of thrust washers＜Countermeasures＞･dispose＜Probable causes＞･Excessive axial load due tomisaligned roll or irregular section
height of bearings in one shaft.
＜Countermeasures＞･Restraining misalligned roll･Control of section height of bearingsin one shaft＜Countermeasures＞
Inner ring cracking･dispose＜Probable causes＞･Minimal loading･improper lubrication＜Countermeasures＞･proper loading･review lubricant condition＜Countermeasures＞･Reusable by lapping using
In case of severe condition,
dispose (when picture’s
state, dispose)

Raceway wear
＜Countermeasures＞･proper loading･review lubricant condition＜Countermeasures＞･Usually disposal＜Probable causes＞･Excessive loading･improper lubrication
Fretting on bore surface
of inner ring

Roller abrasion＜Probable causes＞･Bearing misalignment･improper lubrication･Foreign matter jam＜Countermeasures＞･Maintaining alignment of
the bearing･review lubricant condition＜Countermeasures＞･usually disposal＜Countermeasures＞･Appropriate caution during
bearing’s disassembling andre-assembling＜Countermeasures＞･Reusable by lapping using
oil grinding stone or
sandpaper･In case of severe condition,
dispose＜Probable causes＞･Loose fitting between shaft and inner ring＜Countermeasures＞･(It is not possible to change
the shaft and inner ring fit
independently)･Apply lubricant into thefitting surface of the shaft
and inner ring Appropriate
operating period＜Countermeasures＞
・Reusable by lapping using
oil grinding stone or
sandpaper

10Bearing dimensions table
A list of available bearings can be found in the following dimensions table. For any dimensions which are not on the table, please consult JTEKT.

C
r
r1

H
T
d D

Design 1

Design 2

Boundary dimensions (mm)Design 3

Basic load ratings (kN)

Fatigue limit
load
(kN)

Bearing No.

Design 4
Bearing
section height
when
Design manufactured(mm)

Design 5

Design 6

Mass (kg)Amount ofbearings
required
per mill
1)

Applicablemulti-rollmill typed (F w )

D

T

C

r

r1

Cr

C 0r

31.75

76.2

46.23

45.85

0.8

1.5

121

183

31.5

06DC0846A

4

22.200

1.27

40

ZR34

54.999120

25.99925.999

1.6

1.6

99.3

138

18.8

11N1226V

7

32.4672

1.69

24,56

ZR24

55

120

52.197

52

1.6

1.6

254

341

45.9

11DC12524

32.483

3.27

40

ZR24

70

160

90

90

1.5

1.5

434

546

81.2

14DC1690LDS-1

5

44.977

10.1

40

ZR33

70

160.07

90

90

1.5

1.5

475

667

101

14DC1690ADS

1

45.00010.5

32,48,72

ZR33

90

190

100

100

3

3

593

770

109

18DC19100NDS

549.980

14.7

48

ZR25

100

225.021

80

80

1.5

1.5

759

991

136

20DC23080DS

362.47418.2

12（36）

ZR23

100

225.021

120

120

1.5

1.5

1020

1440

199

20DC23120MDS

1

62.474

27.2

32

ZR23

100

225

100

100

3

1.5

683

838

114

20DC23100NDS-1

562.480

21.7

40

ZR23

99.995

225

120

120

1.5

1.5

780

995

135

20DC23120KDS-2

2

62.47426.0

32,40,48

ZR23

130

300

160

159.5

4

3.5

1660

2340

297

26DC30160DS

1

84.9617

64.8

40,48

ZR22

130

300

172.644172.644

4

3.5

1950

2900

363

26DC30170MDS

1

84.955

72.6

40,48

ZR22

130

300

172.644172.644

4

3.5

1650

2210

275

26DC30170KDS-3

2

84.955

70

40,48

ZR22

180

406.42171.04171.04

4

4

2580

3810

450

36DC41171DS

1

113.155

130

48,56

ZR21

180

406.42171.04171.04

4

1

2390

3340

389

36DC41171ADS

6

113.155

124

48,56

ZR21

180

406.42171.04171.04

4

3

2090

2960

346

36DC41171KDS

2

113.155

125

48

ZR21

179.984406.43223.96

217

4

0.5

2940

4500

515

36DC41217DS+DP1

113.155

161

40,48

ZR21

179.984406.43224.25

220

4

3

2430

3530

405

36DC41224KDS

2

113.181

160

32,48

ZR21

180

406.42224.25

224

4

3

2860

4230

480

36DC41224QDS

5

113.155

162

40,48

ZR21

50

110

44.4

44.4

1.1

1.1

158

167

24.5

10NUP1144

–

–

2.33

–

ZR22,ZR21

50

125

48

46

2.0

1.1

202

213

28.0

10NUP1346/48

–

–

3.39

–

ZR21

50

125

52

52

5.0

1.1

226

256

35.0

10NUP1352

–

–

3.8

–

ZR21

Cu

H

Design 7

Applicable multi-roll mill rolls arrangement

Cylindrical roller bearings for work roll thrust

Note 1) The numbers in parentheses, show necessary bearing quantities per mill. Differences in numbers in parentheses mean it is necessary to use other bearings as well.

1112

Bearing dimensions table
A list of available bearings can be found in the following dimensions table. For any dimensions which are not on the table, please consult JTEKT.

C
r
r1

H
T
d D

Dimensions mark design

Design 8

Boundary dimensions (mm)d (F w )D

T

Design 9

Basic load ratings (kN)

C

r

r1

Cr

C 0r

Fatigue limit
load
(kN)

Bearing No.

Cu

Design 10
Bearing
section height
when
Design manufactured(mm)

Design 11

Mass (kg)Amount ofbearings
required
per mill
1)H

934.976

5.15

32

50

120

80

80

1.5

1.5

335

379

56.4

10DC1280DS

50

120

85

85

1.5

1.5

379

427

63.2

10DC1285DS

934.984

5.40

32

60

160

95

95

1.5

2

498

589

88.3

12DC1695DS

946.484

11.5

20（32）

65

170

100

100

2

2

498

597

89.6

13DC17100DS

952.48013.5

10（34）

90

230

100

100

2

3

802

982

133

18DC23100DS

969.98024.2

24（34）

100

260

95

95

2

2

871

1060

143

20DC2695DS

979.970

30.2

32

100

260

105

105

2

2

975

787

161

20DC26105DS

979.970

33.5

32

90

260

125

125

2

2

1150

1520

197

18DC26125DS

984.970

41.3

34

100

260

130

130

2

2

1190

1580

204

20DC26130DS

979.970

41.5

32

110

280

165

165

2

2

1390

1880

250

22DC28165DS

8

84.96560.2

10（34）

120

280

165

165

2

3

1380

1940

244

24DC28165DS

979.965

57.7

14（38）

120

350

165

165

2

3

1710

2220

273

24DC35165ADS

12

114.96598.3

24（34）

130

350

175

175

2

3

1750

2300

281

26DC35175DS

12

109.965101

24（38）

62

155

90

90

1

2

445

529

78.3

12DC1690DS

946.484

9.97

8（44）

62

155

110

110

1

2

505

622

95.6

12DC16110DS

8

46.48412.2

36（44）

90

220

95

95

2

2

664

795

112

18DC2295DS

964.982

20.9

40

90

220

130

130

2

2

873

1130

158

18DC22130ADS

8

64.982

28.7

32,40

115

260

140

140

3

2

1220

1690

225

23DC26140DS

872.470

41.9

40

65

165

70

70

1.5

2

531

586

90.1

13DC1770DS

1149.982

8.83

40

90

220

94

94

2

1.5

860

997

138

18DC2294DS

11

64.976

21.2

40

90

220

96

94

3

3

618

700

101

18DC2294/96DS

10

65.000

21.0

64

130

300.02

130

129

2

3

1300

1740

215

26DC30130DS

985.010

52.2

56

130

300.02

130

129

4

3.5

1340

1620

206

26DC30130BDS

10

85.010

51.8

–

130

300.02

132

129

2

3

1430

1830

231

26DC30132ADS

985.01053.8

72Applicablemulti-rollmill type

Design 12

Applicable multi-roll mill rolls arrangement

12HI

20HI

Note 1) The numbers in parentheses, show necessary bearing quantities per mill. Differences in numbers in parentheses mean it is necessary to use other bearings as well.

13

14

Improving ease of outer ring regrinding work
We provide regrinding jigs which are capable of grinding the outer ring outside diameter of the bearing with high accuracy.

Required performance and issues

Bearing-regrinding Jigs

Improving ease of outer ring regrinding work
Advantages

・The jigs minimize the radial run out of
the bearings after regrinding.
Once the bearing is installed into the jig, the jig completely
nullifies any clearance on the fitting surface between the jig
and bearing and the Internal clearance of the bearing,eliminating play in the radial direction. The jig grinds theoutside diameter surface while turning the outer ring andretaining the inner ring as stationary, enabling grinding
under the same conditions as when in operation. Grindingof the bearings radial run-out can be performed with a highlevel of accuracy.

Regrinding jig

Jig type and constructions

The jigs come in two types, which should be selected according to the dimensions and types of backing-shaft bearings. Please specify the type suitable to your needs.

■ Type 1■ Type 2

This type of jig is suitable for bearings over 70mm bore with an outer ring rib.
This jig requires a hole for the work carrier on the side face of outer ring.

This type of jig is suitable for both bearings with and without outer ring rib.
It is used on the Sendzimir Rolling Mills ZR21 and ZR22.

Outer ring crowning

Outer ring crowning

Bearing assembly

Bearing assemblyHole for work carrier
No bearing disassembling

・The jigs improve efficient installation and removal

Easy installation/ removal

Bearings can be installed on and removed from the jig
easily without the need of disassembling the inner ring andouter ring. There is no possibility that rollers will come off.

Bearings remain in place

HydraulicHydraulic chamber

Bearing assemblyOuter ring clamps

Outer ring clamps

Bearing assembly
Overview

The outer surfaces of the
bearings used on the backing
shafts of multi-roll mills should
be ground periodically to retain
precise bearing performance,thus ensuring the quality ofrolledproducts. JTEKT
supplies the jigs that grind
bearing’s outside diametersurface with high precision.

HydraulicTypical installation of suitable bearing on jig Type 1

0.25

25

Unit : ㎜

Typical installation of suitable bearing on jig Type 2

0.15

Smooth interconnection by lapping
36DC41171

25

Unit : ㎜

Smooth interconnection by lapping
26DC30170

Regrinding jig
Example of Outer ring crowning dimensions

Cylindrical grinder for outer ring-regrinding

Measurement for bearing section height

JTEKT provides the GE series which is capable of processing both roll

Advantages

grinding and outer ring-regrinding with high accuracy using cylindrical
grinders.

・easy bearing installation / removal

Overview

Mounting the regrinding jig andbearing assembly to the cylindrical grinder

15

・possible to measure to 1/1000mm
・possible to measure bearings radial run-out

When the outer surface of a bearing is ground, it iscritical to accurately control the variation of bearing’s
section heights of all the bearings installed on thebacking shaft. JTEKT supplies Measurement forbearing section height that suit the individual bearings
listed on the dimensional table.

cylindrical grinder（GE6i-PRO）16

Large size bearing technology development center
JTEKT’s accumulated knowledge and experience helps our customers solve problems. We provide new high value-added
products and processes for businesses by having developed a global supply system to meet those demands.

JTEKT established a large size bearing technology development center to evaluate and analyze
large size bearing uses in the industrial machinery field.
Until now, with regards to large size bearings
used in the industrial machinery field, investment
was made in the actual machines before accurate
modeling was done resulting in customer dissatisfaction. As a result, development time took too
long due to the problems that arose.
Now, we are able to simulate and evaluate
production conditions close to the real machines
in our large size bearing technology developing
center.
The accumulated data for bearing testing equipment for steel production equipment introduced
has allowed us to improve the accuracy of CAE
analysis (simulation analysis) which gives us asignificant reduction for the products developmental period and in the development of newhigh value-added products for the future.

■ Bearing testing equipment
for steel production
equipment
Our testing equipment is able to evaluate
the scattering rolling mill water under ahigh temperature environment to recreate
close to actual conditions.
In this way, we can deliver bearings andoil seal components with excellent performance.

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