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连轧机万向连接轴系用42CrMo钢,图1为该轴的示意图。对两端虎口内的圆孤面及平面进行淬火处理,硬度达HRC40以上。虎口内的圆弧面采用中频感应加热,聚乙烯醇合成剂冷却淬火;平面采用中频感应加热,水冷却淬火。对淬火部位进行磁力探伤,结果在圆弧面和平面上均发现裂纹。圆弧面上的裂纹集中分布在虎口唇部。平面上的裂纹呈单条分布,无规律,淬火处理6件连接轴的12个虎口内部都出现上述情况的裂纹。6件连接轴全部报废,损失十多万元。为查清裂纹原因,进行以下分析工作。
42CrMo steel is connected to the shaft of a mill in a rolling mill. FIG. 1 is a schematic view of the shaft. On both ends of the tiger’s mouth round surface and plane quenching, hardness of HRC40 or more. Hukou internal arc surface using induction heating, polyvinylalcohol cooling quenching; flat induction heating, water quenching. The quenching site for magnetic testing, the results found in the arc and plane cracks are found. The arc surface cracks are concentrated in the tiger’s lips. Cracks in the plane was a single distribution, irregular, quenching 6 connecting shaft 12 tiger mouth internal cracks appear above. 6 connecting shaft all scrapped, loss of more than 100,000 yuan. In order to find out the cause of cracks, the following analysis work is done.