在采用热芯盒方法制造砂芯的生产中，顺畅的排气和为保证充型压力而使芯盒有必须的密闭性一直是一对难以解决的矛盾。传统的芯盒排气结构仅仅能满足一些形状简单且精度要求较低的砂芯的生产，而对于一些形状复杂、精度要求较高的砂芯，则必须根据实际砂芯的特点来改进芯盒... In the production of sand cores using the hot-box method, smooth exhaust and the necessary tightness of the core box to ensure filling pressure have always been a pair of difficult to resolve contradictions. The traditional core box exhaust structure can only meet the production of some simple and less precise sand cores. For some complicated and high precision sand cores, the core box must be modified according to the characteristics of the actual core ...