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We all know the heat treatment skills; how many people actually know how to use them? Today I will give us a comment on the use of bearing heat treatment skills. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
(1) Expanded the use scale of GCR15 steel; usually GCR15 steel M quenching useful wall thickness of 12MM or less; but BL quenching because of the strong cooling capacity of nitrate salt; if mixing, stringing, adding water, etc.; Useful wall thickness can be extended to about 28MM.
.2) The hardness is stable and uniform. Because the BL transition is a slow process; usually GCR15 steel needs 4H; GCR18MO steel needs 5H; the ferrule is isothermal in the long time in the nitrate salt; the outer core arrangement changes are simply carried out together; Good uniformity; usually GCR15 steel BL after quenching hardness of 59 ~ 61HRC; uniformity ≤ 1HRC; unlike quenching when the ferrule wall thickness is slightly larger, it presents low hardness, soft point, poor uniformity and Other problems.
.3) Reducing quenching and grinding cracks in the production of railway and rolling mill bearings; because the ferrule is large in size and heavy in weight; M is brittle when oil quenching; strong cooling is often adopted to achieve high hardness after quenching; Microcracking, while BL quenching; because the BL arrangement is much better than the M arrangement; the external surface constitutes a compressive stress of up to -400 ~ -500MPA; the quenching crack tendency is greatly reduced, and the external compressive stress is offset during the grinding process. Some grinding stress; reduce the overall stress level; greatly reduce the grinding crack.
.4) Improvement of bearing service life Regarding railways and rolling mill bearings that accept large impact loads; the primary failure mode after M quenching is: inner casing cracking during installation; the outer ring of the impacted outer ring is lost during use. Fragmentation; austempered bearing because of good impact resistance, surface compressive stress; regardless of the inner sleeve cracking during installation; still in the process of using the jacket ribs off the block, the inner sleeve fragmentation tendency is greatly reduced.咴 α α. Therefore; after isothermal quenching than M quenching after the average life and reliability progress.
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Source: China Bearing Network Time: 2013-05-24