HILERAS/6 ROWS

Technical  characteristics

Multi  row  cylindrical  roller  bearings  are  being used in applications where a high radial load ca- pacity is required,chiefly in rolling mill stands, roller presses and calendars.

These bearings are designed for accepting high radial loads only.Hence,any axial load must be accommodated by a separate locating bearing.

VEO multi row cylindrical roller bearings are avai- lable in different basic layouts andvarious mate- rial and design variants.The bearings are being optimized for working at high speeds which is ty- pical for calendar and

rolling mill applications.

Due to the widerange of different designs avai- lable,all VEO multi row bearings are being produ- ced to customer's orders only.

Four row cylindrical roller bearings

VEO four row cylindrical roller bearings are be ing designed for working at heavy loads and high speeds,i.e.in  rolling  mill  stands.VEO  offers  a wide variety of different designs

VEO four row cylindrical roller bearings are avai- lable in a variety of differentdesigns for meeting the individual requirements of different applica- tions.Depending on the individual designs,these bearings may

feature following technical charac- teristics:

Oil grooves in the side faces of inner and/or outer ring

Helical  groove  in  the  bearing  bore  diameter

Circumferential   groove   and   lubrication holes in the outer ring

Tapered  bore

Case  hardened  rings  and  /or  rollers

Bainitic  hardened  rings  and  /or   rollers

Seals on one or both sides

Six row cylindrical roller bearings

Six  row  cylindrical  roller  bearings  are  primarily used  in  small  cold  rolling  mills  for  flat  products where high forces and high speeds occur.

The bearings have an outer ring with two loose flanges  and  three  loose  guiding  rings,between which the six roller rows are guided.

Three double pronged machine brass cages retain the  rollers.

The  inner  ring  without  flanges  allow  for  limited axial  displacements  of  the  roll  neck  within  the bearing.

Dimensions

The boundary dimensions of four row cylindrical roller bearings are not subjected to international standards.VEO four row cylindrical roller bearings are being fully interchangeable with the products of other

bearing manufacturers.

The dimensions of the six-row cylindrical roller bearings of series NNU 69 and NNU 60 are in ac- cordance with ISO 15:1998.

Tolerances

VEO four row  cylindrical  roller  bearings  are being produced with the VEO standard accuracy  for rolling neck bearings,i.e.featuring P6 dimensionalaccuracy and a P5 inner ring running 

accuracy as standard.

VEO six row cylindrical roller bearings are standard manufactured to normal tolerance class,PN.

Internal  radial  clearance

VEO four row cylindrical roller  bearings are  normally produced with C3 or C4 radial internal clearance required for rolling mill bearings. Bearings for mounting with a loose fit on the roll necks

generally  have C2  radial  internal clearance.

VEO six row cylindrical roller bearings are produ- ced with the radial internal clearance specified by customer order

The clearance values,where standardized,con- form to DIN620-4 and ISO5753:1991 and are given in the tables of radial cylindrical roller bearings.

Minimum  load

Rolling element bearings require a minimum ra- dial  load  to  avoid  sliding  friction.Particularly cylindrical roller bearings require a minimum ra- dial load of more than 4%of the dynamic load

rating Cr.

Veo four -column and six -column cylindrical roller bearings with cylindrical holes

Veo four -column and six -column cylindrical roller bearings with cylindrical holes

Equivalent dynamic bearing load

P=F

Equivalent static bearing load

P 。=F

Mounting of four and six row VEO cylindrical roller bearings

A particular care combined with knowledge and experience must be applied when handling and mounting multi row cylindrical roller bearings.

In VEO multi row cylindrical roller bearings,all  components of each individual bearing are mar- ked with the same consecutive number to pre- vent the parts of different bearings from getting

mixed up in error.The individual components of a bearing are marked with letters for identifica- tion.

The individual components of each bearing must be mounted in correct sequence.As the indivi- dual parts of every VEO multi row bearings are  being carefully matched,an interchange of com-

ponents even between bearings of the same type must be strictly avoided.