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轴承套圈球化退火是轴承生产中的一个重要环节.其目的在于获得良好的退火组织,降低毛坯硬度,便于车削加工.并为淬火、口火作好组织准备.在无产阶级文化大革命取得全面胜利的战鼓声中,我厂退火工序投入生产.当时只有一个退火炉.没有现成工艺,我们又是门外汉.工作中遇到了不少困难,退火质量一直不够稳定.例如,操作和化验人员曾经误将过热组织判为欠热组织,造成多次返修.其二是总想多装多退,采用1000×700×500毫米的大箱装料,一车十四箱,结果箱内温差较大,工件组织不均.其三是急于求成,工艺不当.采用了快速高温加热,使炉温很快升到890～900℃,然后进行800℃保温,结果出现上面过热,下面欠热,仅中间合格.另外,由于出炉温度过高,冷却速度太快,
Bearing ring Spheroidizing is an important part of the bearing production.The purpose is to obtain a good annealing organization, reduce the hardness of the rough, easy turning and preparation for quenching, mouth fire organization in the proletarian cultural revolution to achieve full victory Of the drums, I plant annealing process put into production. At that time there was only one annealing furnace. There is no ready-made technology, we are laymen. Work encountered many difficulties, the annealing quality has not been stable enough. For example, the operation and laboratory personnel have mistakenly Overheated organizations sentenced to under-heat organizations, resulting in multiple repairs. The second is always want to wear more equipment, using 1000 × 700 × 500 mm large box loading, a car fourteen boxes, the results of a larger temperature difference between the box, the workpiece Uneven organization. The third is eager to seek, improper process using a rapid high temperature heating, the furnace temperature rose quickly to 890 ~ 900 ℃, then 800 ℃ insulation, the results appear above the overheating, under the heat, only the middle of the pass In addition, the temperature is too high, the cooling rate is too fast,