INA bearings use material handling and corrosion protection measures
In order to make the deep groove ball bearing parts quenching and tempering the surface residual greater compressive stress, when heated in the hardening pass into the carburizing or nitriding atmosphere, for a short period of surface carburization or nitriding.
Austenitic not actual carbon content of this steel quenching, well below the equilibrium concentration phase diagram shows, so you can suck carbon (or nitrogen). Austenite with high carbon or nitrogen, reduce the Ms quenching surface compared to the inner and center martensitic transformation occurs, resulting in a larger residual compressive stress. The Hardening GCrl5 steel carburizing atmosphere and carburizing atmosphere (both by the low-temperature tempering) after the treatment, the contact fatigue test can be seen, surface carburization life than not carburization increased 1.5 times. The reason is that the surface of the carburized parts having a large residual compressive stress.
The INA bearings parts service life of high-carbon chromium steel material factors and the degree of control:
Carbide steel in the original tissue before quenching requirements of small, dispersed. Austenitizing 630 ℃, can be high temperature or high temperature of 420 ℃, unwrought waste heat to achieve rapid annealing process.
GCr15 steel after quenching, the requirement to obtain the average carbon content of about 0.55% cryptocrystalline martensite, about 9% Ar and 7 percent were uniform, round state undissolved carbides microstructure. Quenching temperature and time to control this microstructure.
Parts after quenching and tempering larger surface residual compressive stress, which contribute to the improvement of the fatigue resistance. Quenching may be used the surface short carburizing or nitriding treatment process, making the large compressive residual stress on the surface.
Manufacturing INA steel bearing parts, and requires a high level of purity, is to reduce the content of O2, N2, P, oxides and phosphides. The electroslag remelting can be used to vacuum smelting technology measures the material oxygen content ≤ 15PPM appropriate.
1, soak method: deep groove ball bearings using soaked in rust oil, allowed to surface adhesion layer of rust grease. The film thickness can control the temperature or viscosity of the anti-rust grease to achieve.
2,Brushing method: NA immersion or spray of INA bearings or special shape bearing brush when it is necessary to pay attention not produce anti-rust oil accumulation, we should pay attention coated to prevent leakage.
3,spray method: some large bearing not the the soaking method oiled generally about 0.7Mpa pressure filtered compressed air in place of the air cleaning spray. Spray method applies the solvent dilution rust oil or a thin layer of anti-rust oil, but it must be used to improve the fire safety and labor protection measures.
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