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BJ130半轴为我厂主要产品,一段时期,在淬火后发现了大批开裂现象,废品率达到7％,这种情况以往极少出现,因此,对事故的原因进行了仔细分析。 BJ130半轴材率为40Cr,生产工艺流程如下:下料→锻打→退火→精加工→调质→校正→包装。退火工艺为880±10℃×3h炉冷到550℃出炉空冷,调质工艺为900℃×7～8min(盐炉),油冷,450℃×2h
BJ130 axle for the main products of our factory, for a period of time, after quenching found a large number of cracking phenomenon, the rejection rate reached 7%, this situation rarely seen in the past, therefore, a careful analysis of the causes of the accident. BJ130 semi shaft material rate is 40Cr, the production process is as follows: blanking → forging → annealing → finishing → quenching and tempering → calibration → packaging. Annealing process is 880 ± 10 ℃ × 3h furnace cooling to 550 ℃ baked air cooling, quenching and tempering process is 900 ℃ × 7 ~ 8min (salt furnace), oil cooling, 450 ℃ × 2h