China Aluminum Industry Network – Proper design, meticulous manufacturing, appropriate die repair, and timely nitriding of extrusion dies are essential to prevent the occurrence of streak defects.
a. A well-designed extrusion die plays a crucial role in avoiding streaks. This includes the correct placement of the shunt hole, proper determination of the working land length, and smooth transitions between different sections. The shape of the bridge drop and the welding angle should be carefully considered so that the welding point falls within the plane of the weld chamber. Ensuring sufficient rigidity and strength of the die core is vital, as is deepening the weld chamber or increasing its cross-sectional area when necessary. In some cases, using the "Shen Bridge" technique can significantly reduce the likelihood of streak defects. This is one of the fundamental strategies for maintaining consistent metal flow and preventing surface imperfections.
b. Mold manufacturing must strictly follow the specifications outlined in the drawings. Special attention should be given to the surface finish of the shunt hole and the die bridge, ensuring they have a drip-like shape. This improves the flow of solid metal and reduces frictional heat, which helps maintain uniform material distribution during extrusion.
c. When dealing with molds that produce streaks, it's important for the mold repair technician to visit the site and understand the actual extrusion conditions. This allows for a more accurate assessment of the problem and the development of an effective repair plan. Observing the profile discharge in real time, rather than relying solely on visual inspection of the extrusion head, provides more precise insights into the defect’s origin and helps determine the best course of action.
d. Timely nitriding of the extrusion dies is also critical. It enhances the surface hardness and wear resistance, contributing to better metal flow and reducing the chances of streak formation. By combining these measures—design, processing, repair, and treatment—manufacturers can significantly improve the quality and consistency of extruded aluminum profiles.
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