挤压铸造致密化机理
The densification mechanism of squeeze casting
摘要：
基于经典凝固理论和塑性形变理论，分析了挤压铸造过程中的凝固过程。在忽略熔体密度变化的情况下，冲头速度与凝固速度之间存在线性关系。为了获得无缺陷的铸件，冲头速度应大于凝固速度。并对致密化机理进行了探讨。塑性形变将导致中心熔融金属的径向移动，从而减小从中心到型壁的温度梯度，这为获得无缺陷铸件提供了条件：同时形核。
英文摘要：
The solidification process during squeeze casting is analyzed based on the classical solidification and plastic deformation theory. The linear relationship between punch velocity and the solidification rate is established if the density change of molten meals is neglected. To obtain defect-free castings, the punch velocity should be larger than the solidification rate. The densification mechanism is also discussed. The plastic deformation will result in the radical movement of the central molten metals, which reduces the temperature gradient from the center to the mold wall, which provides the condition to obtain defect-free castings: simultaneous nucleation.
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