灰铸铁制动鼓石墨钝化生产工艺探讨

Investigation on Graphite Passivation Production Technology of Gray Cast Iron Brake Drum

针对商用车在反复刹车时频繁的冷热循环易造成制动鼓开裂失效的问题,提出一种利用稀土元素、氮元素及钝化处理工艺钝化片状石墨端部的方法。在高碳当量成分条件下(CE≥3.9%),探讨灰铸铁制动鼓石墨钝化材质及生产工艺,提高制动鼓的常规力学性能和抗热疲劳性能,为商用车耐热及抗热疲劳制动鼓铸件的生产提供技术支持。

Aiming at the problem that the brake drum cracking failure is easily caused by frequent cold and hot cycles during repeated braking of commercial vehicles,a method of passivating the-flake graphite end by using of rare earth element,nitrogen element and passivation process is proposed.Under the condition of high carbon equivalent composition(CE≥3.9%),the graphite passivation material and production process of the gray cast iron brake drum were investigated to improve the conventional mechanical properties and thermal fatigue resistance properties of the brake drum,and provided technical support for the production of heat-resistant and hermal fatigue resistance brake drum castings for commercial vehicles.