Cobblestone crusher bearing lubricant selection skills

1, anti-rust performance

The grease used in the bearing must have an anti-rust effect, and the anti-rust agent is preferably insoluble in water. Grease should have good adhesion and form an oil film on the surface of the steel.

2, mechanical stability

Grease becomes soft during machining and causes leakage. In normal operation, grease will be trapped inside the bearing by the bearing housing. If the mechanical stability of the grease is insufficient, during the operation, the structure of the soap of the grease will mechanically disintegrate, causing the grease to be destroyed, thereby losing the lubricating effect.

3, oil seal

Oil seals are necessary barriers to protect bearings and lubricants from external contamination. During the operation of the bearings, no matter whether debris or moisture can penetrate into the bearings to prevent damage.

Proper installation and maintenance is an important factor in the longest service life of the bearing. At the same time, attention must be paid to the cleanliness of the bearings, the correctness of the choice of bearings and the selection of appropriate installation and maintenance tools. In addition, the bearings must be protected from contamination and moisture and ensure proper installation and lubrication.

4, mixed grease

Never mix incompatible greases. If two incompatible greases are mixed, the consistency will usually soften and eventually the bearings may be damaged due to the loss of grease. If you do not know which grease the bearing originally used, you must completely remove the old grease inside and outside the bearing before adding new grease.

5, the classification of oil

Mainly according to temperature and working conditions: grease can be classified according to their allowable working temperature. The consistency and lubricating ability of grease are affected by working temperature. Bearings operating at a certain temperature must choose the correct consistency at the same temperature. Grease with good lubrication. Grease is manufactured in different operating temperature ranges and can be roughly classified into low temperature, medium temperature and high temperature greases. At the same time, there is a type of grease called extrusion resistance or extrusion resistance and the addition of molybdenum disulfide, and at the same time, an additive is added thereto to strengthen the strength of the lubricant film.

6, the important factor in the choice of oil

If the grease is wrongly selected, all measures to prevent the bearing are futile. It is important to choose a grease whose base oil viscosity provides sufficient lubrication at the working temperature. The viscosity is mainly affected.

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Characteristics and application of spindle bearing oil

Spindle bearing oil is a special lubricant for spindle bearings of precision machine tools and similar equipment. It plays an important role in ensuring the working accuracy and performance of the spindle and prolonging its service life. It is also called bearing oil.

    Its main performance:

    1, suitable viscosity and good viscosity temperature characteristics

    In order to make the machine tool spindle temperature not too high, the machine tool will be thermally deformed, affecting the machining accuracy or making the bearing poorly lubricated. The lubricating oil of the appropriate temperature should be selected according to the spindle bearing structure, the rotating speed and the bearing clearance, and it is required to have good viscosity-temperature characteristics. To prevent the change in viscosity due to excessive changes in the operating temperature of the spindle and the ambient temperature, which affects the lubrication performance.

    2, good lubricity

    In order to maintain a uniform oil film between the main shaft and the bearing contact surface, and the impact film is not damaged when the spindle starts or stops moving, maintaining good lubrication performance reduces friction and friction heat, reduces spindle temperature rise, and ensures The effect of processing accuracy requires good lubrication performance.

    3, good oxidation resistance

    When the machine tool spindle adopts the circulating lubrication method, the spindle bearing oil is required to be used for a long time without deterioration, so it is required to have good oxidation resistance.

    4, good rust resistance

    Since the oil is inevitably mixed into the condensed water in the air or the machine coolant during the operation of the spindle lubrication system, the oil is required to have good rust resistance.

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FAG bearing type and applicable accuracy grade

FAG bearing type and applicable accuracy grade:

    Bearing form Applicable standard Applicable accuracy grade
    Deep groove ball bearings GB307 Level 0 Level 6 Level 5 Level 4 Level 2
    Angular contact ball bearings 0 level 6 level 5 level 4 level 2 level
    Self-aligning ball bearing
    Cylindrical Roller Bearings 0 Class 6 Level 5 Level 4 Level 2
    Tapered roller bearings Metric series (single row) GB307 Level 0 Level 6 Level 6 Level 5 Level 4
    Metric series (double row, four columns) SB/T5341994 Level 0
    Inch Series SB/CO/T1089 Class4 Class2 Class3 Class0 Class00
    Spherical roller bearings GB307 Level 0
    Thrust ball bearing 0 level 6 level 5 level 4 level
    Thrust spherical roller bearings
    The GB/T30794 standard divides the bearing grade into G E D C B. The ISO, JIS and other standards are as follows:

    Standard accuracy
    GB/T30794 B C D E G
    ISO CLASS2 CALSS4 CLASS5 CLASS6 NORMAL CLASS
    DIN P2 P4 P5 P6 P0
    ANSI ABEC9 ABEC7 ABEC5 ABEC3 ABEC1
    JIS JIS2 JIS4 JIS5 JIS6 JIS0

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Lubrication is important for imported bearings

The importance of lubrication for imported bearings is mentioned in the article "Checking the faults and handling of imported bearings in operation". Now let's talk about the effects of lubrication on imported bearings. Whether the lubricant or lubrication method is correct or not will greatly affect the life of the imported bearings.

    The impact of lubrication on the performance of imported bearings can be divided into the following aspects:

    1. Firstly, lubricate the parts of the imported bearings to reduce the friction and wear of the imported bearings;

    2. The rolling contact surface of the imported bearing often forms an appropriate oil film to prolong the fatigue life of the imported bearing;

    3. The heat generated by friction or other reasons inside the imported bearing is removed by lubrication;

    4, through the lubrication can achieve the effect of rust and dust on the imported bearings.

    The two main lubrication methods for imported bearings are grease lubrication and oil lubrication.

    Grease lubrication has a sealing method in which the sealed bearing is filled with grease in advance, and a filling and fat filling method in which the inside of the outer casing is filled with an appropriate amount of grease and replenished or replaced at intervals. In addition, for machines that require multiple bearings to be lubricated, a centralized grease supply method that connects the pipes to each lubrication location is also used. Grease lubrication can be used after filling the grease for a long time without replenishing, and the structure of the sealing device is relatively simple, so it is widely used. Oil lubrication is relatively simple. Regular lubrication can increase the service life of imported bearings.

    Well, the importance of lubrication on imported bearings is mentioned here.

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