SKF bearings use those heat treatment skills

(1) Clean heat treatment

Waste water, waste gas, waste salt, dust, noise and electromagnetic radiation produced by heat treatment will pollute the environment. To deal with the environmental pollution of heat treatment, the implementation of clean heat treatment (or green heat treatment) is one of the development directions of heat treatment skills in developed countries. In order to reduce the emission of SO2, CO, CO2, dust and coal slag, the use of coal as fuel has been completely eliminated, and the amount of heavy oil used has become less and less. Most people switch to light oil, and natural gas is still the most ideal fuel. The waste heat utilization of the incinerator has reached a high level. The optimization of the incinerator structure and the strict control of the air-fuel ratio ensure that the NOX and CO are reduced to the lowest limit under the premise of reasonable incineration; gas carburization and carbonitriding are used And vacuum heat treatment technology replaces salt bath treatment to reduce the pollution of waste salt and CN-containing toxic substances to water sources; selects water-soluble quenching oil to replace part of quenching oil, and uses biodegradable vegetable oil to replace part of mineral oil to reduce oil pollution.

(2) Fine heat treatment

Fine heat treatment has two meanings: on the one hand, it is based on the application requirements, materials, and structural dimensions of the parts, using physical metallurgy common sense and advanced computer simulation and testing skills to optimize process parameters to achieve the required functions or maximize the use of data On the other hand, it is sufficient to ensure the stability of the optimized process, the finished product quality dispersion is very small (or zero) and the heat treatment distortion becomes zero.

(3) Energy-saving heat treatment

Scientific production and power management are the most potential factors for the useful utilization of power. It is the choice of scientific management to establish a professional heat treatment plant to ensure full production and make full use of equipment capabilities. In terms of heat treatment power structure, priority is given to selecting primary power; making full use of waste heat and waste heat; choosing low-energy, short-cycle processes to replace long-cycle and high-energy-consuming processes.

(4) Less non-oxidizing heat treatment

By choosing protective atmosphere heating instead of oxidizing atmosphere heating to controllable atmosphere heating that accurately controls carbon potential and nitrogen potential, the function of the parts after heat treatment is improved, and the defects of heat treatment such as decarburization and cracks are greatly reduced, and the finishing allowance after heat treatment is reduced , Advance the utilization of materials and machining efficiency. Vacuum heating gas quenching, vacuum or low-pressure carburizing, nitriding, nitrocarburizing and boronizing can significantly improve quality, reduce distortion, and advance life.

The quality control of heat treatment of bearing parts is the most severe in the entire machinery industry. Bearing heat treatment has made great progress in the past 20 years, mainly in the following aspects: the study of basic heat treatment theory; the study of heat treatment technology and application skills; the development of new heat treatment equipment and related skills.