Several bearing steel metallurgy technology described as follows:
1. Vacuum induction smelting method cure method (VIM)
In vacuum induction smelting, select basic does not contain impurities, chemical composition and smelting alloy steel level as scrap steel into small electric induction furnace, the furnace at large vacuum chamber, vacuum chamber consists of a sealed hopper to add the required alloy. Start as early as during the rapid melting and refining of molten steel degassing, after completion of smelting, let the fire tilt and molten steel into the steel mold. In a vacuum sealed room, the steel mold into and exit from pouring position automatically. This vacuum induction melting furnace process is used to make high quality air bearing steel is one of the earliest vacuum smelting method. Today, one of its main function is to provide for the production of high purity of vacuum arc remelting steel electrode.
2. The vacuum arc remelting (VAR)
This process is to have the ideal chemical composition of an electrode placement around a water cooling, internal to the vacuum of copper. Arc generated at the bottom, and the same alloy electrode between the composition of the substrate. When the electrode loss under high vacuum degree, it will automatically fall, and the control voltage to maintain a constant operation parameters. Because of the control mode of solidification, so basically no center hole and water the remelting steel key segregated. Remelting steel improved the mechanical properties, especially mechanical properties of the transverse direction.
3. The introduction of continuous casting
Adopt top casting before Series Of SKF Bearings http://www.timkenbearings-hk.com/news.html 50 s, 50 s after the bottom casting method is adopted, with anti oxidation coating agent, inert gas protection, improve the material measures such as floor brick, make the bottom casting molten steel ingot purity are improved greatly. Since 1982 the introduction of large section (370 mm x 470 mm billet) vertical continuous casting technology for bearing steel production technology and a new step. In the process of continuous casting billet to take effective measures to isolate steel exposed to air, strictly control the quality of refractory material and make the oxygen content of billet is able to control well, achieve (3 ~ 8) x 10-6 range. The adoption of high power electromagnetic stirring device, solidification stage can greatly improve the crystalline structure.
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