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本文应用弹性力学和传热学等理论导出了树脂砂型(芯)在铸造过程中的热应力和机械应力关于厚度方向的一维空间z和受热时间t的二元方程,据此提出了一种新颖的树脂砂型(芯)热开裂的理论判据,并首次建立了铸件产生脉纹缺陷的理论判据。文中对该热开裂理论判据进行了简化分析,结果表明:以前的一些判据只是该判据的特例或简化式。文章还根据所得的理论判据提出了防止砂型(芯)热开裂和铸件产生脉纹缺陷的措施。
In this paper, the theory of elasticity and heat transfer is used to derive the binary equation of thermal stress and mechanical stress of resin sand mold (core) in the process of casting and the one dimensional space z and the heating time t in the thickness direction. Novel resin sand (core) thermal cracking theoretical criteria, and for the first time established the theoretical criteria for casting defects generated pulse defects. The theoretical analysis of the thermal cracking criterion is simplified. The results show that some of the previous criteria are only special cases or simplifications of the criterion. The article also based on the theoretical criteria obtained to prevent the sand (core) thermal cracking and casting defects generated pulse measures.