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Back-up rollers with pivot for metal  flattening machines

The pivot is made in two different  steel types, according to dimension and shape:

1) core hardened steel UNI 100 Cr6/100 CrMo7;

2) case hardened steel UNI 18 NiCrMo5.

In both cases the degree of hardness is 60-HRC.

The bearings have a grease lubrication system and are supplied already pre-lubricated. The lubrication system foresees both the entrance and the exit of grease. They can be supplied also in Long-life execution.

The sealing system is very efficient, it does not allow outer agents (such as, dust, mill scale, humidity) to enter the back-up roll; at the same time, it prevents the leakage of grease.

Precision class P0; on request the rollers can be manufactured with precision class P5 (DIN 620) and selected in groups.

On request, they can be manufactured in stainless steel.

The wide working surface, along with the rolling system, made of two or more cages, allow the plant to reach very high flattening performance and high speed.

The distance rings, which are obtained entirely on the outer ring and on the pivot, and the circle clearance, which is calculated at the minimum, allow a good support of axial loads.

The execution with roller cages represent the most advanced series of back-up rolls.

This series of back-up rollers is usually manufactured with two lateral thrust bearings in the inner body, either with balls or rollers, which guarantee a very strong support of axial loads.

Back-up rollers with pivot for metal flattening machines have the following characteristics:

The outer ring is supplied in UNI 100Cr6/100CrMo7 core hardened steel that can reach hardness 60-2 HRC.

Once seen the condition of coupling with working cylinders, the degree of hardness can be reduced to 53÷58 on request.

The profile of the outer ring is usually cambered in order to optimize the distribution of the applied load.

The bearings are supplied with 2ZL seals or PP seals, on request

The back-up rolls are grease lubricated according to DIN 51825

Air filling is provided for PDA execution

Dimension H is selected in groups of 0.008 mm

Cw: Dynamic load

Cow: Static load

Technical Characteristics

Back-up rollers for metal flattening machines are made in two different executions:

- full complement of cylindrical rollers

- with roller cages in mould steel or bronze.

The full complement execution allows the bearing to reach a high load capacity both dynamic and static.

1.  Seeger locking ring

2.  Fey seal ring

3.  Support thrust ring

4.  O-ring seal

5.  Outer ring

6.  O-ring seal

7.  Support thrust ring

8.  Fey seal ring

9.  Seeger locking ring

10.  O-ring seal

11.  Cylindrical rollers

EXECUTION WITH 4 ROWS OF ROLLERS

EXECUTION WITH 2 ROWS OF ROLLERS

12.  Cage

13.  Support little thrust ring

14.  Seeger seal ring

15.  Pivot

16.  Seeger seal ring

17.  Support little thrust ring

18.  Cage

19.  Cylindrical rollers

C.R. Ref.

300-0001

300-0002

300-0003

300-0004

300-0005

300-0006

300-0007

300-0008

300-0009

300-0010

300-0011

300-0012

300-0013

300-0014

300-0015

300-0016

300-0017

300-0018

300-0019

300-0020

300-0021

300-0022

300-0023

300-0024

300-0025

300-0026

300-0027

300-0028

300-0029

300-0030

300-0031

300-0032

Rows of

rollers

2

2

4

2

4

2

4

4

2

2

2

2

2

2

2

4

4

4

2

2

2

2

4

4

2

2

2

2

2

2

4

2

Reference

CRAT 24.5X12X75

CRAT 33X19X90

CRAT 47X20X155

CRAT 47X22X145

CRAT 50X20X165

CRAT 52X20X55

CRAT 52X20X125

CRAT 55X25X159.5

CRAT 60X25X90

CRAT 60X25X160

CRAT 60X25X170

CRAT 60X30X151.25

CRAT 60X30X189

CRAT 60X30X201

CRAT 60X30X202

CRAT 65X25X198

CRAT 75X40X165

CRAT 76X40X165

CRAT 80X35X201

CRAT 80X35X210

CRAT 80X35X230

CRAT 80X35X302.5

CRAT 80X40X180

CRAT 80X40X210

CRAT 90X45X134.3

CRAT 90X45X140

CRAT 95X45X288

CRAT 95X45X362

CRAT 100X45X245

CRAT 100X45X246

CRAT 100X45X246

CRAT 134X55X146

D

mm.

24,5

33

47

47

50

52

52

55

60

60

60

60

60

60

60

65

75

76

80

80

80

80

80

80

90

90

95

95

100

100

100

134

d

mm.

12

19

20

22

20

20

20

25

25

25

25

30

30

30

30

25

40

40

35

35

35

35

40

40

45

45

45

45

45

45

45

55

L

mm.

75

90

155

145

166

55

125

159,5

90

160

170

151,25

189

201

202

198

165

165

201

210

230

302,5

180

210

134,3

140

288

362

245

246

246

146

B

mm.

41

57

125

115

128

24

94

125

50

130

130

109,25

160,3

160,3

160,3

156

140

140

160,3

170

200

261,8

140

150

100

100

236

310

200

200

200

83

h

mm.

-

-

-

21

-

-

-

21

-

-

-

27

25

-

27

21,5

29,5

30

-

-

30,5

-

-

-

-

-

-

-

-

-

-

50

Seal

PDA

-

-

-

-

•

-

-

-

•

•

•

•

-

•

•

-

-

-

•

•

-

•

•

-

•

•

•

•

•

•

•

•

Outer Ø

mm.

24,5

33

47

47

50

52

52

55

60

60

60

60

60

60

60

65

75

76

80

80

80

80

80

80

90

90

95

95

100

100

100

134

E

mm.

43

58

126

-

130

27,4

95

-

52

132

132

111,3

-

-

162

168

143

143

-

-

-

-

143

156

102

102

240

314

201,4

201,4

201,4

85

Cages

•

•

•

•

•

-

•

•

•

•

•

•

•

•

•

•

-

-

•

•

•

•

•

•

-

-

•

•

•

•

•

-

Cw

KN

10

18

57,2

46,4

69,1

33

65,1

100,4

36,2

71,3

71,3

70,2

72,4

72,4

72,4

124,2

149

152,3

111,2

111,2

114,5

111,2

127,5

136

139,3

157,7

173,9

179,3

175

175

280,8

227,9

Cow

KN

16,8

33

65,9

49,2

83,2

43

77,7

131,8

43

84,3

84,3

82

85,3

85,3

85,3

170,6

208,5

213,8

115,6

115,6

118,8

115,6

171,7

188

167,4

195,5

229

238,7

231,1

231,1

415,8

315

C.R. s.r.l. - 26845 Codogno (LODI) - ITALY - Via S. Pertini, 6/8 (Z.I.) - tel. +39 0377 437021 - fax +39 0377 437107 - p.iva 01183740198 |  info@crsrl.com