China Aluminum Industry Network – Proper design, meticulous manufacturing, appropriate die repair, and timely nitriding of extrusion dies are essential steps in preventing surface streak defects. These measures play a crucial role in ensuring the quality and consistency of extruded aluminum profiles.
a. A well-designed extrusion die is fundamental. The layout of the shunt hole should be carefully planned to ensure even metal flow. The length of the working band must be reasonably determined, with smooth transitions between different sections. The shape of the bridge drop and the welding angle should also be optimized so that the weld point falls within the plane of the welding chamber. This helps maintain the structural integrity and strength of the die core. Deepening the welding chamber or increasing its cross-sectional area can further improve performance. In some cases, using the "Shen Bridge" technique is an effective method for minimizing streak defects.
b. The mold must be manufactured strictly according to the design drawings. Particular attention should be given to the surface finish of the shunt hole and the die bridge. Ensuring a drip-like shape on these surfaces improves the flow of solid metal and reduces frictional heat, which can lead to better material distribution and fewer imperfections.
c. When dealing with molds that produce streaks, the die repair technician should visit the production site to observe the actual extrusion conditions. This hands-on approach allows for a more accurate assessment of the problem and the development of an effective repair plan. Observing the profile as it exits the die provides more insight than simply reviewing the exit section, helping to identify the root cause of the issue.
d. Timely nitriding of the extrusion die is essential. This process enhances the surface hardness and wear resistance, ensuring smooth metal flow and reducing the likelihood of defects during the extrusion process.
By implementing these strategies, manufacturers can significantly reduce the occurrence of stripe defects, leading to higher-quality products and more efficient production processes.
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