Effect identification method of bearing parts of the non-standard heat treatment technology applications

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Repair imported bearings, quenching, tempering, annealing, and three common heat treatment methods, tools, alcohol lamp and torch, the method is simple, very practical.
General filing system parts to quenching, in order to improve the hardness of parts, and to lay the foundation for grinding, polishing.thin wall bearings
Quenching method is to wet the steel parts of the file system, surface dipped in some borax, red-hot alcohol lamp L with blowpipe into the oil. The parts surface coverage borax purpose in order to prevent the parts decarburization phenomenon. The broken parts of fire due to the surface layer of borax, was black.
Tempering must be removed before. Parts borax into the water-filled copper container and the alcohol lamp seven heated to boiling, borax automatically from parts off.
Quenching part very hard, very brittle, must be tempered to achieve appropriate hardness. After heating was stopped, the parts of the quenching is usually placed on a copper plate, and heated in the alcohol lamp, so that parts become brown in the air can be cooled naturally. Usually between R C55-62 Rockwell hardness Day tempered hardness of parts. The imported bearing movement parts (steel) hardness requirements recommended in Appendix nv.abec 9 bearings
(1) expand the range of applications of GCr15 steel GCr15 steel M quenching ferrule generally effective wall thickness of 12mm or less, but the BL quenching nitrate cooling ability, the use of stirring, moving string, add water and other measures ferrule The effective wall thickness can be expanded to about 28 mm.
(2) hardness and stability, good uniformity
BL transformation is a slow process, generally GCr15 steel required 4h GCr18Mo steel need 5h, ferrule in saltpetre in a long time, such as temperature, the surface of the heart tissue shift almost the same time, so the hardness stability, uniformity, general GCr15 steel BL quenched hardness 59 ~ 61HRC uniformity ≤ 1 HRC, unlike M quenching ferrule wall thickness slightly larger on low hardness, soft spots, and poor uniformit y.deep grove ball bearing
(3) reduce quenching, grinding cracks
Railway, production of non-standard bearings, rings large size, heavy weight, M tissue fragility oil quenching, high hardness after quenching often take strong cooling measures result quenching microcrack; when BL quenching, BL tissue much better than the toughness of the M organization, while the surface of up to -400 ~-500MPa compressive stress, greatly reduces the the quenching cracks tendency [19]; ​​grinding surface compressive stress is partly offset by a grinding stress, the overall stress levels, greatly reducing the grinding cracks.
(4) increase the bearing life
Withstand large impact loads railways, non-standard bearings after M after quenching the main failure mode: sets of cracks within the assembly, the use of the process by the the impact outer ring ribs off the block, the inner ring fragmentation austemperin g bearing good impact toughness, surface compressive stress, regardless of assembly sets of cracks within, coat ribs off the process of using block the inner sleeve fragmentation tendentious greatly reduced, and lower roller edge stress concentration. Therefore, M quenched after austempering than the average life expectancy and improve the reliability.ball bearing supplier