球墨铸铁滚筒的铸造缺陷分析及防止措施

Casting Defects Analysis and Preventive Measures of Nodular Iron Roller

介绍了滚筒类铸件的结构及技术要求,详细阐述了该铸件的生产工艺,并针对生产中出现的缺陷给出相应防止措施:通过优化冒口设计以及合理布置成型冷铁,很好地解决了滚筒轴头部位缩孔、缩松缺陷;采用优化浇注系统设计,解决了筒身缩松及夹杂类缺陷;铺设倾斜砂床等工艺措施保证铸件尺寸要求;通过预设排气通道和密封措施保障排气畅通,解决铸件气孔类缺陷的发生。生产验证结果显示:采取以上措施后,滚筒铸件的废品率由原来的41.5%降到了4.7%,目前,滚筒的废品率可以稳定控制在3.0%以下,取得了较好的效果。

The structure and technical requirements of roller castings were introduced.The production process of the castings was described in detail,and corresponding preventive measures were given against the defects in the production:by optimizing the design of the riser and rationally arranging the formed chilled iron,the shrinkage and porosity defects of the roller shaft head were well resolved.Optimized pouring system design was adopted to solve the barrel shrinkage and inclusion defects.Inclined sand bed and other technological measures were taken to ensure the size requirements of castings.Exhaust channels and sealing measures were taken to ensure smooth exhaust and solve the occurrence of casting defects such as porosity.The production verification results showed that after taking the above measures,the scrap rate of roller castings had been reduced from 41.5%to 4.7%.At present,the scrap rate of rollers could be stably controlled below 3.0%,and good results had been achieved.