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22/10/2020 - Carbon will precipitate from the austenite and diffuse

When Mechanical Bearing 6001 the steel ingot is trimmed, it is not cleaned up. Therefore, there is strict control in the technical standards of steel. Porosity reduces the density of steel, significantly reduces mechanical properties, and reduces the service life of the bearing. Forged steel dimensional tolerances are generally in accordance with GB908-72 standard, hot-rolled steel dimensional tolerances are in accordance with GB702-86, cold drawn steel is in accordance with GB905-82, and cold drawn steel wire is in accordance with YB245-64. ⑥ Porosity:

The small pores caused by volume shrinkage during the condensation process of molten steel are called porosity. Due to the severe banding of steel, improper cooling after forging and rolling, or incorrect annealing process may cause uneven annealing structure. . After hot pickling, check the segregation and the degree of porosity with the naked eye for shrinkage, white spot cracks, overburning and other defects. Tensile test:

The steel wire and steel plate shall be subjected to tensile test, and the tensile test of the steel wire shall take a sample of 250mm in length at one end of the steel wire and perform the tensile test on the tensile testing machine. The steel or parts with white spots have a significant decrease in longitudinal and transverse mechanical properties, so the steel or parts with white spots have no use value. In general, there must be no cracks, folds, tears, scars and slag inclusions on the surface of the bearing steel. If the cooling rate is too slow between 800 and 900 ℃,

carbon will precipitate from the austenite and diffuse into the grain boundaries, forming secondary carbides between the grain boundaries, present in a network, so it is called a carbide network. How to make the distribution of carbides uniform, dispersed and fine is one of the important issues to improve the quality of bearing steel. Fracture inspection: cold-drawn annealed and hot-rolled annealed steel with a diameter of less than 30mm should be inspected for fracture., grooves are carved on the surface of the steel, which are called scratches or scratches.

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12/10/2020 - The lubrication performance will deteriorate

If the oil viscosity grade is selected too high, it will cause poor pumping performance of the oil pump, decrease in flow rate, and deteriorate lubricity, washing and heat dissipation properties.1.. 6. In severe cases, the lost grease may penetrate into the brake device, causing the brake to fail and cause an accident. 2.

If the use conditions are more severe than the specified use conditions, you should select a higher grade oil (through the test), or shorten the oil change interval appropriately. In the practice of machine oil change and maintenance, the actual conditions of use must also be considered. It is often seen in the oil change, maintenance and repair work of the machine: in addition to coating the hub bearing with grease, the cavity of the hub is also filled. The so-called 63 Series Ball Bearings 'empty hub lubrication' is to coat the hub bearing with grease, and the inner cavity of the hub is only coated with a thin layer of grease to prevent rust.

The fatliquoring method is customarily called 'full hub lubrication'. Therefore, when refueling, you should not 'prefer more' for fear of insufficient fuel. In fact, too much oil will not only increase the power consumption of the crankshaft due to the increased rotational resistance, but also the oil is prone to bubbles, emulsification and leakage, resulting in poor lubrication. High viscosity oil is beneficial to the engine than low viscosity oil. Practice has proved that hollow hub lubrication is the best way for wheel hub bearings. On the contrary, the starting resistance of the engine will increase,

the lubrication performance will deteriorate, and the wear of the parts will be aggravated.   Modern lubricating oils have added various additives to improve their lubricating performance. The effect of full-hub lubrication is better than that of empty-hub lubrication. 'Full-hub lubrication' not only wastes grease, but also increases internal friction due to excessive grease, and the temperature rise of the bearing increases, causing grease loss. More oil than less, we know that a small amount of oil will cause insufficient oil supply, poor lubrication, and cause mechanical accidents. Unchangeable oil grade required by the machine. The basis for 'high-viscosity oil can solve the above problems' is insufficient.

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Carbon will precipitate from the austenite and diffuse
The lubrication performance will deteriorate

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