Aluminum alloy extrusion die

Abstract

The invention discloses an aluminum alloy extrusion die. The die comprises a die shell, and an extrusion chamber and a die bridge which are arranged in the die shell, the die bridge is connected with the die shell, the extrusion chamber is divided into N extrusion subchambers; and the die bridge comprises a first outer wall and a second outer wall, the vertical section of the die bridge comprises a first vertical section portion, and the first vertical section portion gradually narrows along the pushed extrusion direction of fluidic aluminum alloy, wherein an angle between the first outer wall and the second outer wall in the first vertical section portion is a first predetermined angle, and extends along a first predetermined length. The die bridge is arranged in a feeding chamber to make the fluidic aluminum alloy divided by the die bridge and the fluidic aluminum alloy entering the center of the feeding chamber blocked and rubbed by the die bridge in order to realize slow flow in the extrusion process, so the flow velocities of center metal and edge metal are balanced, and the discontinuity phenomenon is reduced.

Description

technical field [0001] The invention relates to an extrusion die, in particular to an aluminum alloy extrusion die. Background technique [0002] Backsinking rejects are a common defect in forward extrusion. figure 1 Schematic illustration of the extrusion process of a fluid aluminum alloy in an existing die. Such as figure 1 As shown, during the extrusion process, the edge fluid aluminum alloy is hindered by the friction between the mold and the extrusion cylinder, and the flow velocity will be slower than that of the central fluid aluminum alloy. When the extrusion enters the late stage, a vacant state is bound to be formed due to the large outflow of the center fluid aluminum alloy. Flow, to fill the vacancy of the central fluid aluminum alloy, so that the dirt, cold metal aluminum, oxides, etc. at the edge enter into the product, destroying the structure of the product, that is, forming a tail. [0003] Therefore, due to the oil stains, oxides on the surface of the r...

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Problems solved by technology

[0003] Therefore, due to the oil stains, oxides on the surface of the raw materials, dirt in the extrusion cylinder, cold aluminum alloy, etc., flow into the product at the later stage of extrusion, forming a discontinuous, non-dense structure, sometimes even hollow, making the structure and properties of the product Go bad, can't be used and become waste products, greatly reducing extrusion yield

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