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Why should the bearing heat treatment
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| Time：2016.11.07 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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We all know that heat treatment technology, then the application of how many people really understand it? Today I put the bearing heat treatment technology to explain to you.
(1) to expand the scope of the application of GCr15 steel, GCr15 steel M quenching ring when the effective wall thickness of 12mm in the following, but BL quenching ability due to nitrate cooling, if the use of mixing, stringing, water and other measures, The effective wall thickness can be expanded to about 28 mm.
(2) hardness and stability, good uniformity
As the BL transformation is a slow process, the general GCr15 steel to be 4h, GCr18Mo steel to be 5h, rings in the salt for a long time isothermal, the surface of the heart tissue changes almost simultaneously, so the hardness is stable, uniformity, the general GCr15 steel BL Hardness after quenching in the 59 ~ 61HRC, uniformity ≤ 1 HRC, not as hardened when the ring wall thickness slightly larger hardness, soft points, poor uniformity and other issues.
(3) to reduce quenching, grinding cracks
In the production of railway and rolling mill bearings, due to the large size and heavy weight of the ferrule, the M structure is brittle during oil quenching. In order to obtain high hardness after quenching, strong cooling is often taken, resulting in quenching microcracking. BL organization is much better than M tissue toughness, while the surface formation of up to -400 ~ -500MPa compressive stress, greatly reducing the tendency of quenching cracks; surface grinding stress in the grinding part of the grinding stress, so that the overall stress level Down, greatly reducing the grinding cracks.
(4) bearing life improved
For the railway, rolling mill bearing, which bear large impact load, after M quenching, the main failure modes are: when the inner sleeve is cracked during assembly, the outer ring rib is broken and the inner ring is broken during the use, while the isothermal quenching bearing As the impact toughness, surface compressive stress, regardless of assembly when the inner casing cracking, or the use of the process outside the box block out block, the tendency to greatly reduce the tendency to break, and reduce the edge of the roller stress concentration. Therefore, after the isothermal quenching than M after quenching the average life expectancy and reliability.
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