ã€China Aluminum Industry Network】 1 Introduction After the aluminum alloy extrusions have been treated by etching or anodizing, the surface of the aluminum extrusions appears bright or dark and parallel to the extrusion direction. This line is generally called the welding stripe. Different from the poor welding, the welding stripe will not reduce the mechanical properties of the profile, but the place where the welding stripe is formed forms a large color difference with other places on the profile surface, which seriously affects the appearance of the decorative surface and is difficult to be accepted by users. Therefore, how to eliminate the surface weld stripe of aluminum profiles is a key issue that we need to study.
2 Formation Cause Analysis and Solution Aluminum alloy profiles are produced by hot extrusion of aluminum alloy rods through extrusion dies. Most of the weld strips appear in the hollow profile, because in the extrusion process, the aluminum alloy ingot is divided into several strands of aluminum alloy flow by the flow splitting die, then several strands of aluminum alloy flow in the die welding chamber are welded under the extrusion force. Together they flow out of the die holes to form hollow profiles. In this process, the welding pressure, the flow state of the aluminum alloy, the extrusion temperature and the extrusion speed all affect the production of the weld stripe. Here are some of the factors that affect the welding stripe generated by the solution.
2.1 Depth of welding chamber The aluminum alloy round ingot is divided into several strands of aluminum alloy flow by die diverting hole, then welded and integrated in the welding zone A area and then flow out of the die hole through zone B. If H ≤ A, that is, the aluminum alloy flow has not yet fully welded and has reached the die hole forming, then the profile surface will form a weld line. Therefore, we should make H ≥ A when designing the height of the welding chamber, and leave a certain height as the B zone, so that the aluminum alloy flows out of the die hole after fully welding. In terms of mold correction, for H ≤ A mold, we can use the method of sinking bridges to mill the shunt bridge in zone C to make the final weld room height H > A. The purpose is also to make the aluminum alloy flow fully welded. After leaving the die hole.
2.2 Distributary bridge shape The aluminum alloy profile commonly used 6063 aluminum alloy, its free flow large expansion angle of about 45 °, that is, in the state of only the extrusion force, the deflection of the flow perpendicular to the direction of the extrusion direction of the larger angle of about It is 45°, and the larger the expansion angle is, the smaller the pressure in the expansion angle direction is, as shown in FIG. 2 . If the friction force is not considered, the flow of aluminum alloy in the direction of the diverging bridge after passing through the diverter bridge is welded behind the diverter bridge, and the welding pressure is proportional to the pressure flowing along the diverging bridge, and the diverging bridge abutment angle. The smaller α, the greater the welding pressure of the aluminum alloy flow after the splitter bridge.
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