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我厂的X6105曲轴是稀土——镁球墨铸铁,牌号70—2,批量大,质量要求高。特别是在受力的关键部位不允许出现缩松缺陷。可是缩松缺陷往往都在此部位形成。那么,如何减少缩松缺陷成为我们的一个重要课题。 X6105曲轴的缩松部位及分析 X6105曲轴的缩松部位如图1。连杆颈的加工余量为8mm,两侧臂为3.5mm。铸件经车削加工、粗磨、超声波探伤,发现缩松的范围约为φ4～φ12mm,此部位受力恶劣,若存在缩松缺陷,往往是疲劳源,从而产生断裂。
I plant X6105 crankshaft is a rare earth - magnesium ductile iron, grade 70-2, bulk, high quality requirements. Especially in the key parts of the force does not allow shrinkage defects. However, shrinkage defects are often formed in this area. So, how to reduce the shrinkage defect has become an important issue for us. X6105 crankshaft shrinkage parts and analysis X6105 crankshaft shrinkage parts shown in Figure 1. Linkage machining allowance of 8mm, both sides of the arm 3.5mm. Casting by turning, rough grinding, ultrasonic flaw detection and found that shrinking the range of about φ4 ~ φ12mm, this site poor performance, if there is shrinkage defects, often the source of fatigue, resulting in fracture.