Inventory sliding bearing type of injury

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Scratches (two-body abrasive wear)

Hard particles moving together with the major axis diameter and the friction surface contact, which is the particles and the metal surface of the lower contact stres s on the pad surface, which draw the linear scars; semi-embedded in the pad surface of the hard particles in the major axis diameter on the surface will not draw linear scars are known as scratching. Scratch the case of two-body abrasive wear, the linear scars direction shaft diameter direction of movement.

Lubricant film rupture, the shaft diameter surface peak wheels will scratch the bush, there are many linear scars, it is also a two-body abrasive wear.

Hard particles embedded in the bearing surface and fall off, resulting in a punctate scars scratches.high speed bearing

Most of these particles is iron at the end and grit.

Scratches cause friction surface roughening, thereby reducing the carrying capacity of the lubricant film, and forming the new hard particles can scratch the friction surfaces and the hub peak, resulting in a vicious cycle.

2 (trisomy) a brasive wear

Small hard particles into the bearing clearance, wavering in between the friction surfaces on the friction surface, produce a very high contact stress, constitutes a three-body abrasive wear and similar abrasive action, the surface of the bush and shaft wear. The high contact stresses between the hard particles and the friction surface of the friction surface of the ductile metal to plastic deformation or fatigue damage, so that the friction surface of the brittle metal to rattle or peeling appears.

Abrasive wear scars is linear, the direction is consistent with the major axis diameter direction of movement.

When the edge of the contact, the lack of oil or oil film rupture will produce severe abrasive wear. Abrasive wear will lead to the loss of the shaft and (or) pad the geometric dimensions and the shape change, the accuracy increased, bearing clearance, so that the slide bearing performance drastically deteriorated before the life expectancy.

Seizure (Birch)

In the lubricating oil film rupture or lack state, the large friction factor causes a lot of frictional heat is generated, the bearing temperature rise. Due to softening at high temperatures, a friction of the surface of the low melting point metal adheres in another friction surface, with axis diameter rotary movement formed by shearing, the adhesion of the metal is separated from the original surface, and transferred to another friction surface, cause the apparent friction surface pits and convex scars. This damage is adhesive wear.

A seizure occurs, the friction increases sharply, bearing temperature rises further, creating a vicious cycle. When serious adhesion shaft diameter rotating power can no longer cut open bonding point, the shaft diameter movement will terminate, commonly known as the "axle bearings completely damaged.double row bearing

4 fatigue wear

Fatigue wear also known as fatigue damage. Repeated under the action of the cyclic loading, in the direction perpendicular to the sliding direction, the friction surface fatigue cracks, cracks perpendicular to the pad surface to the depths development binding surface, Go, and the friction surface extending in parallel to the lining and the backing, Finally, the material from the friction surface is flaking off, causing a crater-like damage.

5. Peel

When manufacturing the pad, if the liner and backing combined force or combination of bad in the bearings during operation, under the action of the load, partial lining material is peeled off from the pad down. Peel and fatigue spalling is somewhat similar to the and fatigue spalling pits surrounding irregular, combined with the adverse result of stripping pits surrounding relatively smooth. 6. Corrosion

The continued oxidation of the lubricating oil during use, the oxidation often produce weak organic acids, its bearing material especially corrosive casting copper lead alloys lead, wherein the lead spotty shedding so that the surface roughening.

Strong inorganic acid corrosion of steel journal surface easier.

After the oxidation of tin in the tin-based bearing alloy is in the pad surface to form a layer of SnO2 and SnO black hard coating layer, the hardness in the range of 200 ~ 600HS. This overlay is extremely harmful to the bearing, it is very hard and can scratch the journal surface, and the bearing clearance smaller.

7. Erosion

(1) cavitation

Cavitation is the solid surface in contact with the liquid, and for relative movement is generated when the form of surface damage.

When the lubricating oil when the low pressure area of ??the oil film, the oil will be the formation of bubbles, the bubble movement to the high-pressure zone, the bubble collapse u nder pressure, a great impact force and a high temperature, solid surfaces in the moment of collapse in this repeated impact, material fatigue off, the friction surface of the small pits, and then developed into a sponge-like scars.

Overloading, high-speed, load and speed changes large plain bearings, cavitation often occurs.china bearing supplier

(2) fluid erosion

Fluid intense impact on the solid surface will cause fluid erosion, punctate scars on the solid surface, the smooth surface of this damage.

(3) electrical erosion

As the motor or electrical leakage, spark is generated between the friction surfaces on the friction surface, causing dot scars, wherein injury reciprocating harder journal surface.

Fretting wear 8.

In the liner layer and the backing, the binding surface of the bush and the bearing, due to the combined action of t he metal surface of micro-vibration (slip) and oxidation, the formation of adhesive wear, oxidation (corrosion) and abrasive wear three forms Composite wear, known as fretting, and punctate it resulting in the combination of surface wounds.