激冷铸铁凸轮轴“黑线”的形成机理及对策

• 作 者: 沈保罗 李莉 岳昌林 何勇 沈晓海
• 机 构: 四川大学材料科学与工程学院,成都金顶凸轮轴铸造有限公司,
• 出 处: 现代铸铁
• 发表日期: 2009年05期
• 关键词: 激冷铸铁 凸轮轴 黑线 形成机理 对策

综述国内外铸造工作者对激冷铸造凸轮轴“黑线”缺陷的认识过程,认为:铁碳合金同时具有稳定系共晶以及介稳定系共晶两个共晶反应是导致“黑线”产生的根本原因。根据生产实践,提出了合理选择浇注位置、合理设计冷铁、适当降低w(Si)量和提高w(Cr)量等多项措施,可以防止“黑线”缺陷的产生。

In this paper, the author summarizes the recognition process of chilled casting camshaft “black line ” defects by domestic and foreign foundry workers, and concludes that the two eutectic reactions of iron-carbon alloy with stable system eutectic and metastable system eutectic are the causes of “black Line ”the root cause. According to the production practice, a number of measures, such as choosing the pouring location reasonably, designing the cold iron appropriately, reducing the amount of w (Si) properly and increasing the amount of w (Cr), etc., are proposed to prevent the occurrence of the “black line” defects.