Back-up rollers with pivot for metal flattening machines


Steel Industry - Back-up rollers with pivot for metal flattening machines

Technical Drawing and Exploded View  - Back-up rollers with pivot for metal flattening machines

EXECUTION WITH 2 ROWS OF ROLLERS
EXECUTION WITH 4 ROWS OF ROLLERS

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
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


Technical Data - Back-up rollers with pivot for metal flattening machines

C.R. rif / ref Ø est. (mm) Sigla D (mm) d (mm) L (mm) B (mm) E (mm) h (mm) Tenute / Seal PDA File rulli / Rollers Rows Gabbie / cages Cw (KW) Cow (KW)
300-0003 47 CRAT 47X20X155 47 20 155 125 126 - - 4 • 57,2 65,9
300-0004 47 CRAT 47X22X145 47 22 145 115 - 21 - 2 • 46,4 49,2
300-0005 50 CRAT 50X20X165 50 20 166 128 130 - • 4 • 69,1 83,2
300-0006 52 CRAT 52X20X55 52 20 55 24 27,4 - - 2 - 33 43
300-0007 52 CRAT 52X20X125 52 20 125 94 95 - - 4 • 65,1 77,7
300-0008 55 CRAT 55X25X159.5 55 25 159,5 125 - 21 - 4 • 100,4 131,8
300-0009 60 CRAT 60X25X90 60 25 90 50 52 - • 2 • 36,2 43
300-0010 60 CRAT 60X25X160 60 25 160 130 132 - • 2 • 71,3 84,3
300-0011 60 CRAT 60X25X170 60 25 170 130 132 - • 2 • 71,3 84,3
300-0012 60 CRAT 60X30X151.25 60 30 151,25 109,25 111,3 27 • 2 • 70,2 82
300-0013 60 CRAT 60X30X189 60 30 189 160,3 - 25 - 2 • 72,4 85,3
300-0014 60 CRAT 60X30X201 60 30 201 160,3 - - • 2 • 72,4 85,3
300-0015 60 CRAT 60X30X202 60 30 202 160,3 162 27 • 2 • 72,4 85,3
300-0016 65 CRAT 65X25X198 65 25 198 156 168 21,5 - 4 • 124,2 170,6
300-0017 75 CRAT 75X40X165 75 40 165 140 143 29,5 - 4 - 149 208,5
300-0018 76 CRAT 76X40X165 76 40 165 140 143 30 - 4 - 152,3 213,8
300-0019 80 CRAT 80X35X201 80 35 201 160,3 - - • 2 • 111,2 115,6
300-0020 80 CRAT 80X35X210 80 35 210 170 - - • 2 • 111,2 115,6
300-0021 80 CRAT 80X35X230 80 35 230 200 - 30,5 - 2 • 114,5 118,8
300-0022 80 CRAT 80X35X302.5 80 35 302,5 261,8 - - • 2 • 111,2 115,6
300-0023 80 CRAT 80X40X180 80 40 180 140 143 - • 4 • 127,5 171,7
300-0024 80 CRAT 80X40X210 80 40 210 150 156 - - 4 • 136 188
300-0025 90 CRAT 90X45X134.3 90 45 134,3 100 102 - • 2 - 139,3 167,4
300-0026 90 CRAT 90X45X140 90 45 140 100 102 - • 2 - 157,7 195,5
300-0027 95 CRAT 95X45X288 95 45 288 236 240 - • 2 • 173,9 229
300-0028 95 CRAT 95X45X362 95 45 362 310 314 - • 2 • 179,3 238,7
300-0029 100 CRAT 100X45X245 100 45 245 200 201,4 - • 2 • 175 231,1
300-0030 100 CRAT 100X45X246 100 45 246 200 201,4 - • 2 • 175 231,1
300-0031 100 CRAT 100X45X246 100 45 246 200 201,4 - • 4 • 280,8 415,8
300-0032 134 CRAT 134X55X146 134 55 146 83 85 50 • 2 - 227,9 315

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 with pivot for metal flattening machines

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.

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 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.