At present, die casting is widely used in many industries and fields, especially in large-scale production of automobile, aerospace and other industries, which has become a very important part. So what are the defects of aluminum alloy die casting? How can we completely solve these problems?
1. Porosity problem.
Porosity refers to the holes with different sizes on the die casting or surface, which will lead to the hardness of the die casting and affect the appearance of the die casting surface. We can choose the appropriate release agent to deal with the pores, adjust the process, reduce the low speed appropriately, and confirm whether the release agent spray too much to deal with the pores.
The impurity problem of aluminum alloy die casting mainly consists of aluminum, silicon and a large number of iron, manganese and chromium compound particles at a certain temperature, and a part of oxidation. We can strictly control the composition of aluminum ingot, clean the smelting furnace for conventional furnace bed, regularly slag and other methods to solve this problem.
3、 Shrinkage problem
Shrinkage refers to the phenomenon of small holes with irregular shape and rough inner wall. If the wall thickness is too large, it will lead to slow cooling and solidification speed inside the casting, uneven thickness of the casting and easy to produce shrinkage cavity. It can be eliminated by reducing the wall thickness of the area where the shrinkage cavity is located, changing the processing area by optimizing the casting and mold structure, increasing the depth of the casting preformed hole, and increasing the pressure to enhance the densification of the structure.
Crack means that the matrix of aluminum alloy die-casting is damaged under the action of external force, resulting in long and thin gap, linear or other linear, and has the trend of outward expansion. This problem can be solved by properly controlling the alloy composition, adding cooling water, changing the structure of aluminum alloy die casting, changing or increasing the ejection position.
There are linear strain marks or overall surface strain on the surface of the casting, the liquid metal will adhere to the surface of the mold, and the surface of the casting will have material shortage and strain problems. We can repair the surface damage of the die, modify the slope, improve the surface finish of the die, adjust the ejector pin, balance the jacking force, tension the die, adjust the iron content of the aluminum alloy, adjust the cooling time and other methods to deal with the strain problem.
The above is a detailed introduction to the causes and treatment measures of die casting defects of Shandong Aluminum alloy. For more information, please click http://www.jnhjgs.cn