来源：http://www.jnhjgs.cn 发布时间：2020-08-10 16:41:06 点击：
In the production process of aluminum alloy castings, due to improper operation, improper material selection and other reasons, aluminum alloy die castings will have a variety of quality problems, including mesh burr. What is the matter?
The reticular burr of aluminum alloy casting includes reticular trace, reticular pattern and cracking burr. The main manifestation is the network convex trace and metal thorn formed on the surface of die casting part. The mesh burr of aluminum alloy die casting parts may be caused by too fast metal flow rate and positive erosion of the mold wall; the surface roughness Ra of the mold cavity is too large; the temperature difference between the cold and hot parts of the mold is too large; the material of the die is improper or the heat treatment process is wrong; the casting temperature of the alloy liquid is too high, and the mold preheating is not sufficient; the surface cracking of the mold cavity may cause traces The heat conduction near the gate area is concentrated, and the friction resistance is large. The erosion of hot-melt metal is strong, and the alternation of cold and hot is intense, resulting in hot cracking.
Now that the cause of mesh burr in aluminum alloy die castings has been found, the next solution is to solve the problem. It is necessary for the staff to design the gating system correctly, to meet the requirements of good forming, to use a smaller injection speed as far as possible; to improve the surface quality of the mold cavity and reduce the Ra value; to reduce the pouring temperature of the alloy liquid as far as possible; to fully preheat the mold before die casting to make it reach the working temperature range; to select the mold material correctly and to adopt the reasonable heat treatment process; to anneal the insert regularly, Stress relief.
This paper is provided by Shandong Aluminum Alloy Die Casting finishing, hope to help you, want to know more content, welcome to click our http://www.jnhjgs.cn Website.