论文部分内容阅读
正火处理的目的在于增加金属基体中的珠光体含量和提高珠光体的分散度,从而提高球墨铸铁的强度、硬度和耐磨性。针对我厂的实际情况,在没有较大正火设备的情况下,为了满足铸件设计要求的机械性能,设法寻求一种直接获得铸态珠光体球铁的方法。这对节约能源、降低成本,提高铸件的质量是很有实用意义的。这种方法就是铸造余热正火。一、试验方案铸造余热正火就是当铸件在铸型中完全凝固后,在一定的高温下打开砂箱,使铸件在空气中自然冷却,从而达到要求的机械性能。我厂生产的二百
The purpose of the normalizing treatment is to increase the pearlite content in the metal matrix and to improve the pearlite dispersion so as to improve the strength, hardness and wear resistance of the ductile iron. In response to the actual situation of our plant, in the absence of larger normalizing equipment, in order to meet the mechanical properties of the casting design requirements, try to find a direct access to cast pearlitic ductile iron method. This is very useful for saving energy, reducing costs and improving the quality of castings. This method is casting residual heat normalizing. First, the test program Casting residual heat normalizing is when the casting is completely solidified in the mold, open the flask at a certain high temperature, the natural cooling of castings in the air, so as to achieve the required mechanical properties. I plant two hundred