Wheel flange lubrication


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Metal abrasion (wheel tire)

Description

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Metal abrasion
Extreme wear offs due to
dry friction of the wheel on the rails

     Metal abrasion on wheel and rail,

mainly on
gauge exactness sidewalls,
while travelling curve tracks:
- mostly between two straight track sections
- on bending railway switch constructions and
- reversing loops
to change traffic direction.

High
surface pressure as a sliding friction process leads to the strongest wear offs due to cold weldings and plastic deformation of the steel material up to out rubbing and tearing out of metal filings metal filings from the surfaces because of overstraining.
Therefore burr formations and cavities appear on the wheel tires of the wheels, and furthermore on the sidewalls of the rails. See following drawing and animation.

                                                                  
          
                       Drawing                                                                 Animation


During curve travel the
different ways between inner and outer wheel (on a fixed wheelset axle) are corrected by recurring sliding processes in form of temporary oversteppings of the coefficient of static friction = direct wear off.

Therefore apply lubricator:
= sedimentation of the coarsenesses on wheel and rail
   with contained solids
   (graphite is very well suited).

Aimed
effect (“smoothing effect”)
- coarseness on wheel and rail diminishes for a short time
- excellent sliding properties
- reduction of the axial thrust force (lubrication of head rail running surface)
- essential reduction of wear off..

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