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某轴间分动箱本体铸件,材质为ZL104,采用砂型低压铸造工艺生产,粘砂缺陷较为严重,通过统计分析,发现铸件粘砂产生的原因主要有:型砂中再生砂含量偏高,砂型(芯)烘烤温度过高,芯盒结构不合理,未设置结壳阶段。降低型砂中再生砂含量和砂型(芯)烘烤温度,防止砂型(芯)开裂;合理设计模具结构,通过舂砂保证砂型(芯)的紧实度;增设结壳阶段等,对预防粘砂效果明显。
The cast-iron body of a certain transfer box is made of ZL104 with low-pressure sand casting process. The sticky sand defects are more serious. The statistical analysis shows that the main causes of sticking sand are the high content of reclaimed sand in the sand, Core) baking temperature is too high, the core box structure is not reasonable, not set crust phase. Reduce the sand content in the sand and sand (core) baking temperature, to prevent the sand (core) cracking; reasonable design of the mold structure, through the sand to ensure sand (core) compaction; additional crust phase, to prevent sticky sand The effect is obvious.