Lubrication points during IKO stainless steel bearing operation

If two incompatible fats are mixed, never mix incompatible greases. Usually the consistency will be soft, and finally the damage will be caused by the loss of grease. If you don't know the grease that IKO bearings used, first remove all the original grease and then add a grease to lubricate.

We often encounter such situations in the process of using stainless steel. How are these situations formed? How to solve them when they are formed has always been the biggest headache for the technicians of major enterprises. The cause and solution of the phenomenon of overheating during use will be introduced in detail: the instantaneous high temperature in the grinding zone can be heated to a temperature higher than the tempering heating temperature of the workpiece at a certain depth (10 to 100 nm). In the case where the austenitizing temperature is not reached, as the temperature to be heated is increased, the surface layer will be re-tempered or high-temperature tempered in accordance with the heating temperature, and the hardness will also decrease. The higher the heating temperature, the more the hardness decreases.

In the grinding process, the grinding wheel and the workpiece contact area consume a large amount of energy, generating a large amount of grinding heat, resulting in local instantaneous high temperature in the grinding zone. Using the linear heat transfer heat transfer theoretical formula to derive, calculate or apply the infrared temperature and thermocouple method to measure the instantaneous temperature under experimental conditions, it can be found that the instantaneous temperature in the grinding zone can be as high as 1000-1500 °C in 0.1-0.001 ms. Such instantaneous high temperature is sufficient to cause high temperature oxidation, amorphous structure, high temperature tempering, secondary quenching, and even burn cracking of the surface layer at a certain depth on the working surface.

The surface of the steel under transient high temperature acts on the oxygen in the air and rises into a very thin (20-30 nm) thin layer of iron oxide. It is worth noting that the thickness of the oxide layer is corresponding to the test results of the total thickness of the surface-grinding metamorphic layer. This shows that the thickness of the oxide layer is directly related to the grinding process and is an important indicator of the quality of the grinding.

The grease used in IKO bearings has rust resistance. The performance of rust prevention is mainly based on the solubility of oil, different viscosity and grease formed by different materials, with different levels of anti-volume and anti-rust properties. Generally speaking, the viscosity is large and the fat solubility is poor. The grease is more waterproof. Even if the grease is filled with water in the stainless steel bearing cavity, it can form a layer of oil film that can resist the appearance of the steel. Because of the low rotation speed of the bicycle, the choice of grease can be relatively high, but the water resistance is very strong. Because the bicycle is often used in car wash, rain, and off-road, it is very important to deal with water, even if it is The slightly viscous grease will not affect the smoothness under low rotation, and once the surface is oxidized, the entire peeling process and aging process will be rapidly intensified.

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FAG needle bearing anti-rust and maintenance method

In order to make the FAG bearing parts quenched and tempered, the surface has a large compressive stress, and a carburizing or nitriding atmosphere may be introduced during quenching heating to perform surface carburizing or nitriding for a short time. Since the actual austenite carbon content is not high when the steel is quenched and heated, it is much lower than the equilibrium concentration shown on the phase diagram, so carbon (or nitrogen) can be absorbed. When austenite contains higher carbon or nitrogen, its Ms decreases, and the martensite transformation occurs in the surface layer after quenching than in the inner layer and the core, resulting in a large residual compressive stress. After the GCrl5 steel was heated and quenched by carburizing atmosphere and non-carburizing atmosphere (both low temperature tempering), the contact fatigue test showed that the surface carburizing life was 1.5 times higher than that of non-carburizing. The reason is that the surface of the carburized part has a large residual compressive stress.

The main material factors and control factors affecting the service life of high carbon chromium steel needle roller bearing parts are:

The carbides in the original structure of the steel before quenching are required to be fine and diffuse. High temperature austenitizing at 630 ° C, or 420 ° C high temperature, can also be achieved by wrought waste heat rapid annealing process.

After quenching the GCr15 steel, it is required to obtain a microstructure of cryptocrystalline martensite having an average carbon content of about 0.55%, about 9% of Ar, and about 7% of undissolved carbide in a round state. The quenching heating temperature and time can be utilized to control the microstructure.

After the parts are quenched at low temperature and tempered, a large compressive stress remains on the surface, which contributes to the improvement of fatigue resistance. A treatment process of surface carburizing or nitriding for a short time during quenching heating may be employed, so that a large compressive stress remains on the surface.

Steel for the manufacture of needle bearing parts requires high purity, mainly to reduce the content of O2, N2, P, oxides and phosphides. Electroslag remelting, vacuum smelting and other technical measures can be used to make the material oxygen content ≤ 15PPM.

1. Immersion method: FAG bearings are immersed in anti-rust grease, so that the surface is adhered with a layer of anti-rust grease. The oil film thickness can be achieved by controlling the temperature or viscosity of the rust preventive grease.

2. Brushing method: It is used for needle roller bearings or special-shaped bearings that are not suitable for soaking or spraying. When brushing, it is necessary to pay attention not to produce anti-rust oil accumulation, but also to prevent leakage coating.

3, spray method: some large bearings can not be immersed oil, generally with a pressure of about 0.7Mpa filtered compressed air in the air cleaning place for spraying. The spray method is suitable for solvent-diluted anti-rust oil or thin-layer anti-rust oil, but it must adopt perfect fire and labor protection measures.

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