湿型砂工艺铸件缩松缺陷的消除

Removal of Dispersed Shrinkage for Castings with Green Molding Sand Process

采用黏土湿型砂射压造型生产线,铸件存在缩松和硬度过高的缺陷.从浇注温度、冒口颈和碳当量对铸件缺陷的影响进行了分析,发现铁水高温保温时间过长造成碳烧损是引起铸件缺陷的主要原因.为减少铁水的碳烧损,随其保温时间延长添加增碳剂,铸件缩松和过硬的缺陷彻底消除,从而保证了铸件质量.

The defects of dispersed shrinkage and over high hardness existed in castings while using injection and squeeze molding line with green molding sand. The effects of pouring temperature, riser neck and carbon equivalent on casting defects were analyzed. The main reason of defects was that too long holding time at high temperature of molten iron caused carbon loss. To reduce the carbon loss of molten iron, the carburetant is added with increasing of the holding time. The defects of dispersed shrinkage and over high hardness in castings are eliminated thoroughly to ensure the casting quality.