来源：http://www.jnhjgs.cn 发布时间：2021-09-07 15:30:09 点击：
As many people know, aluminum and aluminum alloys are recognized as ideal materials for future cars. For aluminum. The application of die-casting aluminum parts will greatly reduce the vehicle mass, improve the vehicle power performance and reduce the emission of pollutants.
However, there is a big gap in the bearing capacity of aluminum compared with steel, and the cost is high due to the limitations of current production technology, which limits its application in automobiles.
铝合金压铸的缺陷特征,产生原因,防止方法：名称 流痕及花纹 网状毛翅 脆性 裂纹 缩孔缩松特征及检查方法。
Defect characteristics, causes and prevention methods of aluminum alloy die casting: Name: flow mark and pattern mesh fin brittle crack shrinkage cavity shrinkage porosity characteristics and inspection methods.
Appearance inspection: there are stripes consistent with the flow direction of liquid metal on the surface of aluminum alloy die casting, and there are obvious non directional lines different from the color of metal matrix, and there is no development trend.
Appearance inspection: there are convex or concave traces like reticular hair on the surface of die casting parts, which continue to expand and extend with the increase of die casting times.
Appearance inspection or metallographic examination: the alloy grain is coarse or very small, which makes the casting easy to break or smash.
Appearance inspection: when the casting is placed in alkaline solution, the crack is dark gray, the damage and crack of metal matrix are linear or wavy, the grain is narrow, small and long, and tends to develop under the action of external force. The crack can be divided into penetration and non penetration:
Anatomical appearance inspection or flaw detection; The surface of shrinkage cavity is dark, not smooth and irregularly shaped. Large and concentrated shrinkage cavity and small and scattered shrinkage porosity.
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