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微型轴承钢保持架,下料后要求低温退火以消除内应力,但我厂过去是采用盐浴炉进行加热退火的,经常产生叠在一起、麻点或腐蚀等缺陷,严重影响产品质量.后来热处理小组的老工人同志们,根据这种情况,反复试验研究,终于用土办法解决了这一问题.从71年8月份以来,土法光亮退火一直在成批生产中采用,退火质量稳定合格.其具体方法如下:用一个铁皮箱子,在箱子底部放上一层60～70%的生石灰和40～30%的细河沙,使工件不与氧气接触(所用的石灰与河沙均需事先烘干拌匀).装箱法同团体渗碳一样,
Miniature bearing steel cage, after the request of low-temperature annealing to eliminate stress, but I used to use the factory salt bath furnace annealing, often stacked together, pitting or corrosion and other defects, seriously affecting the quality of the product. Based on this situation, the veteran comrades of the heat treatment group have repeatedly tried and studied this problem and finally solved this problem with the soil method. Since August 71, the bright annealing of earthwork has been used in batch production and the quality of annealing has been passed. The specific method is as follows: Use a metal box, placed in the box at the bottom of a layer of 60 to 70% quicklime and 40 to 30% fine sand, so that the workpiece is not in contact with oxygen (lime and sand used in advance to be roasted Dry mix well.) Packing law with the same group carburizing,