Bearing industry heat treatment technology and development direction

Bearing industry 2020 - heat treatment technology and development direction 06 - 13 cases, established in the bearing material heat treatment technology is the key technology of the service life of the bearing. Bearing industry in our country, the manufacturing precision of bearing has reached international level, but the use of precision lags far behind abroad; The life of the bearing cannot be compared with abroad. High-end bearing market by foreign basic bearing factory possess. Bearing parts heat treatment quality directly affect the use of the bearing accuracy and longevity. Bearing heat treatment in China started late, but nearly a decade bearing by the rapid development of the conventional heat treatment, the average accuracy of general life of the bearing heat treatment can completely realize the mass production. For a long time high carbon chromium bearing adopts martensite quenching + tempering at low temperature, heat treatment bainite hardening, back to the process only on railway passenger cars and part of the rolling mill bearings, etc. Foreign high carbon chromium bearing has not limited on the whole quenching, surface modification on the high carbon chromium bearing in order to realize batch production. The surface modification include low temperature ion seepage, carbonitriding, ion nitriding, surface coating, high-energy beam ion implantation, laser surface heat treatment, etc. Seepage in low temperature can improve the self-lubricating bearing lower bearing friction coefficient; Carbonitriding, ion nitriding, etc all can improve the surface hardness increase abrasion resistance. Bearing technology progress of annealing process is mainly on the energy saving and temperature uniformity. Waste heat utilization annealing, double row double annealing furnace energy saving are batch used in bearing industry. The annealing quality improved significantly, uniform annealing. Energy saving at least 25% compared with before at the same time, the minimum up to 110 c/t, annealing power consumption has been fairly basic and abroad. But after annealing organization levels of detail, there is still a gap with foreign. Degree of carbide refining and all affect the evenness of the service life of bearing. Bearing forging refining process and after the double refining technique have also been used in foreign countries, domestic has not been applied industrial batch, now companies are doing this work, estimates that soon you'll be able to process the breakthrough, reportedly double refinement can improve the bearing life more than 1 times. But double refining process risk is big, the key technology breakthrough. Industrial practice is moving forward, in the near future refinement process will be at the high end bearing double promotion. Double refining technique not only can improve the bearing life, also can improve the dimension stability of bearing operation. At the same time can give full play to the material performance, save material resources. Bainite hardening get better impact toughness of bainite, bainite and martensite compared with good impact toughness, fracture toughness and dimensional stability, but the hardness is lower than that of martensite. High carbon chromium bearing steel bainite hardening and other industries has been successfully used in railway, achieved good efficiency. High carbon chromium bearing steel carburizing and carbonitriding has mature technology abroad, some domestic manufacturers. Carburizing and carbonitriding high carbon chromium bearing use in the field of high-end cars, high-end motorcycle and precision machine tools. These markets are now occupied by foreign more, the wide prospect of market. High carbon chromium bearing steel carburizing and carbonitriding process can prolong the service life of bearing. Ion implantation technology, on the bearing surface modification is nearly 20 years. It can improve the friction of base material. Wear, corrosion and other chemical properties, is a very meaningful materials surface modification technology. Existing industrial practice abroad, the domestic is still in the phase of laboratory. The surface modification technology can greatly improve the service life of bearing, on the domestic bearing heat treatment is worth promoting. At the same time do a good job in high carbon chromium bearing steel surface modification technology is of great significance to saving energy and reducing consumption. Play to potential of materials to the limit is one of the biggest energy saving; The best way is to save resources. Heat treatment technology is the best way to exert potential of materials to the limit of. Bearing precision heat treatment technology for the better development, also through the precise temperature, controlled cooling medium to ensure the bearing quenching after the size of the discrete degree is smaller, but the cost is higher, general enterprises difficult to achieve. Another type of quenching process has limited success in bearing industry development, it is better to control the deformation. Limit type quenching is different from die after carburizing and quenching, high carbon chromium bearing steel is not applicable to die quenching, die quenching is unqualified soft point and organization; Limit type quenching by above 300 ℃ in oil free quenching, type cooling mould under 300 ℃. In a word, the development direction of bearing heat treatment technology for material limit, save material resources, reducing pollution emissions. This paper extracts in the metal processing ( Hot working) Magazine,