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.
For more information and purchase please visit: https://www.supplyforever.com
