低压铸造宽轮辋轮毂轮辐背部缩松缺陷的消除

Elimination of Shrinkage Defect in Cutting Grooves on the Back Side of Spokes on Low Pressure Casting Wide Rim Wheel

低压铸造大尺寸宽轮辋轮毂时轮辐背部挖槽厚大,不能顺序凝固,易出现明显的缩松缺陷,影响产品品质和性能,且在常规模具结构下工艺改进困难。因此,设计了一种内冷却式模具方案,经实际验证,该方案在不使用冷铁及砂芯等情况下,通过更改上、下模镶嵌式结构,优化下模冷却及保温方式,可明显改善轮辐背部挖槽厚大部位的冷却及补缩的工艺问题,进而消除缩松缺陷。

Due to the thick back side of spoke not meeting the sequential solidification requirements,shrinkage defects easily appear in the back side of the spokes on large-size and wide rim wheels after cutting groove,which effects the appearance and safety of the wheel.Meanwhile,it is difficult to adjust and improve the process under the conventional mould structure.An internal cooling die scheme was designed to solve the problem.Through the actual validation,with absence of using the chill or sand core inserts,mould scheme could improve obviously the process of cooling and filling of the thick part of the back side of wheel spokes to eliminate the shrinkage defects by changing the structure of upper and lower insert mold and optimize the cooling and holding temperature of the lower mold.