Analysis on the prevention method of bearing bush damage

Source: Bearing network time: 2017-09-28

/*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';

Damage to the bearing bush is much more common than bearing bushing; therefore, it is important to prevent bearing damage. The bearing bush is in normal operation; it is gradually worn until it finally loses its working ability; its service life is completed; this natural damage is difficult to prevent. If the engine is not properly adjusted, the quality of the smooth oil is poor, or the operating conditions are such that the bearing is prematurely worn or damaged, it is man-made damage. Human damage does not only affect the normal operation of the engine; Reduce the service life of the bearing bush. Therefore, when the engine is overhauled, it is necessary to pay attention to the alloy appearance of the bearing bush; the appearance shape of the tile back, the end and the marginal edge; if there is an abnormal appearance of the half-wearing omen; it is necessary to carefully find out the reason And adopt the corresponding method; improve the operating conditions of the bearing bush; extend its service life to ensure the normal operation of the engine.
In addition to the burning of the bearing bush; common damages include mechanical scars, fatigue pitting, corrosion and cavitation; the following is a breakdown of the causes of these injuries; and a brief description of its prevention methods.
The main causes of mechanical scratches caused by mechanical scars are: poor processing of the outer surface of the bearing bush; residual knife marks and sharp burrs; scratching of the outer surface of the bearing alloy during operation; forming a track flaw, because the smooth oil is not pure; Follow the smooth oil into the bearing gap; it will also scratch the outer surface of the bearing alloy to form a residual flaw, and other may be a solid foreign object is set on the outer surface of the alloy; gradually inhaled part of the alloy to fall; constitute a point-like scar.
In order to reduce or prevent the mechanical damage caused by the above reasons; the following prevention measures should be adopted: the construction of the bearing surface should be completed in the future; the grinding operation should be carried out; the grinding direction should be the same as the working direction of the shaft operation, sometimes the oil hole of the shaft The marginal roughness; it will also scratch the bearing bush; therefore; also pay attention to dressing the oil hole mouth; make it smooth, in addition to this; the key is to ensure that there is a hygienic smooth oil; this should do two things; The first one should be filled with smooth oil; no foreign matter should be mixed in. The second is to ensure that the smooth oil filtration equipment works well; therefore, it is necessary to regularly remove the oil filter and replace the filter element; replace the new oil regularly.
Weary pitting
(l) Tire damage in the middle of the bearing bush. The cause of this damage is mostly due to overload and excessive bearing clearance; therefore, the application should focus on: preventing the bearing from overloading; do not operate at too low or too high speed, the engine The idle speed should be adjusted to a stable condition without collision, ensuring normal bearing clearance.
(2) The fatigue is dropped. There are two reasons for this damage: they are the same; they are formed by excessive overload and bearing clearance, and the second is due to overheating of the bearing operation. To prevent fatigue from falling; Should ensure that the bearing gap is normal, to prevent the engine speed is too high or too low, check the adjustment of the cooling system operation; to ensure that the engine operating temperature is suitable.
(3) Other fatigue pitting. Mostly because the smooth oil is unsanitary; it is caused by the mixing of foreign matter. The prevention method is the same as the mechanical scar prevention.
Corrosion corrosion is usually caused by impure smooth oil; chemical impurities (acid oxides, etc.) invade into the bearing alloy; oxides are mainly caused by high temperature oxidation of engine oil. When the oil temperature is lower than 150 Â°C; corrosion is slow .
In order to prevent the bearing bush corrosion; the application should pay attention to the temperature of the smooth oil and cooling water; avoid the engine operating at high temperatures.
Cavitation cavitation is a modification of the smooth oil flow rate caused by the change of the rotational speed; bubbles occur in the oil; the pressure generated when the bubble breaks repeatedly impacts the appearance of the alloy; and the appearance of the alloy is damaged. This image is particularly intense at high speed and heavy load. .
To prevent cavitation, the following four points should be emphasized: the amount of smooth oil should be sufficient, the oil pressure should not be too low, and the viscosity of the smooth oil should be reduced. The smooth oil should be replaced in time. If the moisture in the smooth oil exceeds 4%, the cavitation damage will be aggravated; To prevent moisture from mixing into the smooth oil; if there is moisture mixed with oil; should find out the reason; promptly remove; and replace the smooth oil.

Recommend to friends comments close window

Bearing related knowledge

Bearings in various industries, the requirements for the identification of imported bearings and the correction of paper machine bearings
INA imported bearing operation features and commonly used materials "SKF bearing corrosion control and elimination" skills rolling mill bearing characteristics and protection

This article links to http://
Please indicate China Bearing Network http://

Previous:Disposal methods for increasing bearing temperature during turbine operation Next: What are the damage methods for sliding bearings?

Brass Cnc Part

CNC machining is the main process for producing copper parts in many industries. Copper has good ductility, electrical conductivity and thermal conductivity, and various machined copper parts are widely used in various industries such as automotive, aerospace, medical and so on. And copper is one of the materials that are easy to machine.

Brass cnc parts,cnc machine for brass parts,brass cnc turned parts,brass cnc machining,brass cnc,cnc machining brass

Taizhou TS HARDWARE Co., Ltd , https://www.shuwengroup.com