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SKF bearings heat treatment coating technology

wallpapers Tech 2020-07-29
There are two methods for SKF bearings heat treatment coating technology.
One method is to use PVD to coat the surface of bearings rings and rolling elements with extremely high hardness diamond ring carbon (DLC). The surface hardness is 40~80% higher than that of hardened bearings steel. The friction coefficient is similar to PTFE or MoS2. Has self-lubricating properties. , It has good bonding with the substrate and does not peel off. The life and wear resistance of SKF bearings are greatly improved, and they can still work normally under the condition of cutting oil. They are called "wear-free bearings";
The second is to use PSC to spray a layer of aluminum oxide with a thickness of 100μm on the outer circumference of the SKF bearing outer ring, so that the insulation capacity of the bearing can reach more than 1000V, and the bearing has a higher insulation capacity by increasing the thickness of the aluminum oxide . The coated alumina is firmly bonded to the substrate and can also improve the corrosion resistance of SKF bearings. Electroplated bearings can be installed like ordinary bearings.
Low temperature ion vulcanization is a surface modification technology that emerged in the late 1980s.
The basic principle is similar to ion nitriding. Under a certain degree of vacuum, high-voltage direct current ionizes sulfur-containing gas. The generated sulfide ions bombard the surface of the workpiece and react with the iron on the surface of the workpiece to form a sulfide with a thickness of about 10 μm, which is mainly composed of FeS. Physical layer. Sulfide is a good solid lubricant that can effectively reduce the friction coefficient of the steel contact surface, and with the increase of the load, the friction coefficient is further reduced, so it can greatly improve the wear resistance of the bearing under heavy load and prolong its use The number of bearing seats of SKF bearings can be increased by about 3 times.
The quality of heat treatment is directly related to the quality of subsequent treatment, which will ultimately affect the performance and life of the parts. At the same time, heat treatment is also a major energy consumer and major polluter in the machinery industry.
In recent years, with the progress of science and technology and its application in heat treatment, the development of heat treatment technology is mainly reflected in the following aspects:
1. Clean heat treatment
 Wastewater, waste gas, waste salt, dust, noise and electromagnetic radiation produced by heat treatment will pollute the environment. In order to solve the environmental pollution problem of heat treatment, the implementation of clean heat treatment (or green environment heat treatment) is one of the development directions of heat treatment technology in developed countries. In order to reduce the emissions of SO 2, CO, CO 2, dust and coal slag, the use of coal as fuel has been basically eliminated, and the use of heavy oil has become less and less. Most light oil is used. Natural gas is still the most ideal fuel. The waste heat utilization rate of the burner has reached a very high level. The optimization of the burner structure and the strict control of the air-fuel ratio ensure that NOx and CO are minimized under the premise of reasonable combustion. Gas carburizing and carbonitriding technology is adopted, and vacuum heat treatment technology is used to replace salt bath treatment to reduce the pollution of wastewater and CN toxic substances to water sources; water-soluble synthetic quenching oil is used to replace part of quenching oil, and biodegradable vegetable oil is used to replace part of it Mineral oil to reduce oil pollution.
2. Precision heat treatment
 Precision heat treatment has two meanings: On the one hand, it uses physical metallurgical knowledge and advanced computer simulation and testing technology to optimize process parameters according to the requirements of parts, materials and structure dimensions to achieve the required performance or maximize the use of materials. On the one hand, it is sufficient to ensure the stability of the optimization process, achieve small (or zero) product quality dispersion and zero heat treatment distortion.
3. Energy-saving heat treatment
 Scientific production and energy management are the most potential factors for the effective use of energy. It is the choice of scientific management to establish a professional heat treatment plant to ensure full production and give full play to the equipment capabilities. In terms of heat treatment energy structure, primary energy is preferable. Make full use of waste heat and waste heat; low energy consumption, short cycle technology is used to replace long cycle, high energy consumption technology.
4. Less non-oxidizing heat treatment
 From heating with a protective atmosphere instead of heating with an oxidizing atmosphere to heating with a controlled atmosphere that precisely controls the carbon and nitrogen potentials, the performance of the parts after heat treatment is improved, the heat treatment defects such as decarburization and cracking are greatly reduced, and the heat treatment The amount of finish processing improves the material utilization rate and processing efficiency. Vacuum heating gas quenching, vacuum or low-pressure carburizing, nitriding, nitrocarburizing and boronizing can significantly improve quality, reduce deformation and extend service life.
The heat treatment quality control of bearing parts is the most stringent in the entire machinery industry. SKF bearing heat treatment has made considerable progress in the past 20 years, mainly in the following aspects: basic theoretical research on heat treatment; research on heat treatment technology and application technology; development of new heat treatment equipment and related technologies.

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Tag: SKF Bearings