Extrusion die and aluminum alloy profile extrusion method

Abstract

The invention provides an extrusion die and an aluminum alloy profile extrusion method. The extrusion die comprises a body and an extrusion channel, wherein the extrusion channel is arranged in the body, runs through the body and comprises a flow guide groove, a conical groove and a working belt which are connected in sequence, and the flow guide groove, the conical groove and the working belt are the same in section shape. According to an aluminum alloy profile, because the ingredient proportion, the extrusion process parameters and the extrusion die are adjusted, so that the hardness is larger than or equal to HB95, and coarse grains on the surface layer and the section are less than or equal to 94 microns.

Description

technical field [0001] The invention belongs to the technical field of manufacturing aluminum alloy profiles, and in particular relates to an extrusion die and an extrusion method for aluminum alloy profiles. Background technique [0002] 6061 aluminum alloy has excellent mechanical properties, good anodizing effect and medium-strength mechanical properties, and is an excellent material for manufacturing frame structures such as equipment casings. Compared with other aluminum alloys, workpieces made of 6061 aluminum alloy, especially optical products such as camera lenses, are stronger, thinner, more wear-resistant, and have a brighter appearance. [0003] In the conventional preparation method of 6061 aluminum alloy profiles, there will be two different structures of recrystallization and non-recrystallization in the profile, and there will be undesirable defects such as oxidation streaks and dull color after non-recrystallization oxidation; recrystallization is equiaxed gr...

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Problems solved by technology

[0003] In the conventional preparation method of 6061 aluminum alloy profiles, there will be two different structures of recrystallization and non-recrystallization in the profile, and there will be undesirable defects such as oxidation streaks and dull color after non-recrystallization oxidation; recrystallization is equiaxed grains , after oxidation, the appearance effect is better; but if there is only recrystallization structure and no non-recrystallization structure, coarse recrystallization phase will also appear, which will affect the performance of aluminum alloy profiles

Moreover, if the aluminum alloy rod is prepared by the conventional method, the advancing speed of the raw material is only 0.5mm / s~1.5mm / s, and if the cross-section is a special-shaped aluminum alloy profile such as a rounded rectangle, the advancing speed of the raw material is even slower.

[0004] As the most common extrusion technology, forward extrusion is often used to prepare 6061 aluminum alloy profiles. In the process of forward extrusion, if a conventional extrusion die is used, the flow rate of raw materials in the center of the die is greater than that at the edge. The extrusion force of the raw materials is different, so there will be coarse grains on the surface and coarse grains on the cross section. After oxidation, obvious mottling will appear on the surface of the product, which will affect the appearance of the product

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