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WF - Maintenance free selflubricating sliding elements

Products in the WF-group
  • Slidingplates
  • Wear plates
  • Cover plates
  • Multiple area wear plates
  • Straight guide bearings
  • Plain bearings
  • Flanged bearings
  • Details acc. to drawings
  • V-gibs
  • Cam stroke plates
We stock RG-bearings and RG-plates for the automotive industry.
Information about WF

(Wartungs freie Gleitelementen, selflubricating slidingelements). Due to constantly increasing maintenance cost the use of self-lubricating sliding elements is becoming more important. The WF-products starts where normal selflubricating bearings and plates ends.

WF 750 -sliding elements are preferably recommended where loads are very high and sliding speeds < 0,5 m/s respectively where an oscillating sliding movement takes place.

Alloys

WF 750-1, a hard "high tensile brass" with ISO no. CuZn25Al5, is the basic alloy in all stocked products. If another alloy is wished for we can offer most alloys and special sizes acc. to your requirements.

In the table below there is a listing of some alternative alloys.


WF-
alloys
Material-
name
Stress
proof

Rp 0,2
N/mm 2
UTS
R m
N/mm 2
Elong.
A 5 %
Brinell
Hard-
ness

HB 10
Load-
carrying
capacity

N/mm2
Applicational areas
WF 750-1
(Std-
alloy)
CuZn25Al5
SS 5234
DIN 1709
C 86300
480 750 8 180 50 High loadcapacity, high abrasion and wear resistance and moderate corrosion resistance. Hardened mating material is favourable.
WF 750-2 SS 5716
CuAl10NiFe
DIN 1714
C 95500
300 700 13 160 50 High cavitation, erosion and corrosion resistance. Insensitive to shock stress and very good abrasionand wear-resistance. Hardened mating mtrl.
WF 750-3 SS 5465
DIN 1705
C90700
150 280 6 95 2 For medium stress, good behaviour of embed, usuable for many applications and sea water resitant. Unhardened mating material possible.
WF 750-4 RG 7
Rödmetall
DIN 1705
130 270 13 75 30 Std. material for general application and medium stress. Also seawater- resistant, few sensitive to edge pres-sure. Unhard. mating mtrl. possible.
WF 750-5 GG 20
DIN 1791
  200   160 20 Good sliding characteristics under low load . Unhardened mating material possible.
WF 750-6 CK 15, 45
DIN 17210
DIN 1720
        20 Sliding surface hardened. For appli-cations with less stringent sliding requirements.
10 advantages offered by WF 750 self-lubricating elements
  • Maintenance-free
  • Wear-resistant
  • Lower coeffecient of friction
  • Heat-resistant up to ca.150° C
  • Long life (with special-performance macro-depots up to 250° C)
  • Corrosion-resistant
  • Shock-resistant
  • No excess lubricant
  • Ideally suited for oscillating movement
  • Stick-slip-free movement
Important facts

WF 750 self lubricating sliding element are preferably recommended where sliding speeds are < 0,5 m/s respectively where an oscillating movement takes place. For extreme service, (i.e. sliding speed >2,0 m/s) additional lubrication is possible and recommended. Maintenance-free performance of self-lubricating elements requires a proper portion of lubricant. In order to embed the lubricant, we recommend the following minimum wall thickness:

Guideplates : > 10 mm
Bearings : 5 % of inner diameter + 3 mm

Type and arrangements of lubricant macro-deposits as well as portion of lubricant depend on shape of self-lubricating element and sliding direction. They are established for each specific application.

Back up material - The difference in hardness between WF 750-1/2/3 and 4 and the back up material should have a hardness of 100 BHN minimum.

Installation guidelines
The following press fit should be used to fit the bearing into the housing:

Housing : H7
Bearing Od Ø:
r6

Before start-up it is important to oil or grease both sliding surfaces. Commercially available oils or greases can be used.

This is where WF 750 can be put to the best use
  • Steel mills
  • General engineering and steel fabrications
  • Rolling mills
  • Automotive industry (tool posts, body presses)
  • Packing machinery
  • Chemical industry
  • Shipbuilding
  • Offshore-equipment
  • Hydraulic structures
  • Hoist- and conveyor equipment
  • Welding technology
  • Construction and quarrying industry, etc.
For further information

Please don´t hesitate to contact us if further information is needed or wished for.

Phone: +46 19 10 45 25
Fax: +46 19 12 38 55
E-mail : brons@lagermetall.se

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