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The reason for the failure of the sliding bearing (2)
Source: Bearing network time: 2013-12-18
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(2) The bearing bush and the bearing seat hole cooperate with each other. The bearing bush can cooperate with the bearing seat hole; the bearing bush can loosen and cause fretting wear. After loose or fretting wear; heat transfer and helium; can make the bearing tile conflict surface temperature too high .
The bearing surface of the bearing bush and the bearing seat are unsanitary; there are particles and dirt; it will also cause poor conduction.
Always look at the appearance of the damaged bearing shell; can provide important information about the failure of the bearing bush; so you should not forget to look at the opposite side of the bearing bush.
(3) Intrusion of particles into particles is an important reason for the failure of sliding bearings; the particles invading the sliding bearings are external; there are also products from the inside of the bearing; that is, the bearing itself wears. The external particles enter the bearing gap first and are smoothed by the oil. Bring in; thus; the sanitary level and sealing layout of the sliding bearing working environment is very important.
Smooth oil can have a hygienic effect; it can also bring particles into the bearing gap; the key is its filtration; therefore; the selection, application and protection of the filter is extremely important.
Generally, the bearing material has certain cavities for embedded particles; the stacked particles exceed the bearing capacity of the bearing material; the bearing conflict will be ground, scratched and worn; the gap will increase; the appearance will become rough. According to the bearing working environment; Smooth method; filter accuracy, seal layout and bearing material matching; is a difficult problem for the sliding bearing painter.
As long as the composition of the particles embedded in the bearing pads is determined; they know their origins and establish the best way and period to eliminate them. The chemical separation skills can separate the embedded particles from the outer surface of the bearing pads. For example: bearing pads with electric lead-coated coating A mixture of acetic acid and hydrogen peroxide can be used, and the aluminum-tin alloy bearing bush can be separated by sodium hydroxide. The tin-bismuth bearing alloy can be separated by a mixture of acetic acid, hydrogen peroxide and sodium hydroxide.
(4) Corrosive smooth oil is continuously oxidized during the application process; the oxidation effect products are acidic substances; they have corrosive effect on bearing data.
In addition, there are some special ways of corrosion should be paid attention to; such as: corrosion of tin-bearing bearing alloy by oxygen, corrosion of sulfur-bearing bearing material of silver and copper, corrosion of copper-lead alloy by moisture, etc.
(5) lack of smooth oil quantity and viscosity modification. If the amount of smooth oil in the sliding bearing is lacking, it will form a catastrophic event. Dynamic pressure bearing; especially in many heavy-duty equipment; often caused by lack of smooth oil when starting Damage; so when starting the equipment; it is very important to make the smooth oil circulation to supply smoothness.
The primary strength of the hydrostatic bearing is that it can be started on the smooth oil film; therefore, when the equipment of the hydrostatic bearing is selected, it is necessary to ensure that the hydrostatic bearing system can be started first;
In the engine; especially in the light load and cold work of the engine; the fuel is often put into the smooth oil. The viscosity of the smooth oil is reduced after the fuel is mixed; the pressure is reduced to a certain critical value; the bearing will exhibit early fatigue damage; the drop is too low; There will also be catastrophic incidents.
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