Several types of sliding bearing damage analysis are as follows:
1. Scratch (two-body abrasive wear)
The
hard particles moving together with the shaft diameter are in contact
with the friction surface, which is the lower contact stress between the
particles and the metal surface. They draw linear injuries on the
surface of the pad; the hard particles on the surface of the pad are
also on the surface of the shaft Draw a line of scars, are called scratches. Scratch is a two-body abrasive wear, the direction of the linear wound and the direction of movement of the same axis.
Lubricating oil film rupture, shaft diameter surface of the hub peak
will also scratch the bearing, there are many linear scars, it is also
two body abrasive wear.
Hard particles embedded in the bearing surface and fall off, causing scratches of scratches.
Most of the above particles are iron and sand.
Scratch causes the surface of the friction surface to roughen, thereby
reducing the carrying capacity of the lubricating oil film, and will
form a new scratchable friction surface of the hard particles and hub
peaks, resulting in a vicious circle.
2. (three body) abrasive wear
Into
the bearing gap between the smaller hard particles, wandering between
the two friction surfaces, in the friction surface to produce high
contact stress, constitute three body abrasive wear, similar to the
grinding effect, so that the bearing and shaft diameter surface wear. The
high contact stress between the hard particles and the frictional
surface causes plastic deformation or fatigue damage to the frictional
surface of the ductile metal, causing the frictional surface of the
brittle metal to crack or peel off. Abrasive wear scar is also linear, the direction of movement with the axis of the same direction.
When the edge of the contact, the lack of oil or oil film rupture, etc. will produce severe abrasive wear. Abrasive wear will lead to shaft diameter and / or bearing geometric
size and shape changes, the accuracy of the loss of bearing clearance,
so that the performance of sliding bearings in the life expectancy
before the rapid deterioration.
3. Bite stick (glued)
In
the lubricating oil film rupture or lack of oil in the state, a large
friction factor resulting in a lot of friction heat, bearing
temperature. At
high temperatures, a low melting point metal on the friction surface
adheres to the other friction surface due to softening, with the shear
action formed by the rotational movement of the shaft diameter, the
adherent metal is disengaged from the original surface and transferred
to another friction surface, Resulting in frictional surfaces with obvious pits and bumps. This damage is adhering to wear.
When the bite occurs, the friction increases sharply, the bearing temperature is further increased, forming a vicious circle. When the adhesion is serious, the shaft diameter of the power can no
longer cut off the bond point, the shaft diameter movement will be
terminated, commonly known as "bearing axis", the bearing completely
damaged.
Fatigue wear
Fatigue wear is also known as fatigue damage. Under
the repeated action of the cyclic load, fatigue cracks appear on the
friction surface in the direction perpendicular to the sliding
direction. The crack develops perpendicularly to the surface of the
bearing pad, and extends to the lining and the backing surface, and
extends to the friction surface parallel to the friction surface, The final material from the friction surface was stripped down, resulting in pit-like damage.
5. stripping
When
the bearing pad is manufactured, if the lining force is insufficient or
the bond is poor, the material of the local lining will be peeled off
from the bearing during the operation of the bearing. Peeling
and fatigue peeling somewhat similar, but fatigue peeling around the
perimeter of the pit, combined with the uneven adhesion caused by the
surrounding relatively smooth pits.
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