A kind of die casting aluminum alloy and preparation method thereof

Abstract

The invention discloses a die-cast aluminum alloy and a preparation method thereof. The preparation method of the die-cast aluminum alloy comprises the following steps: after furnace temperature is preheated, adding pure aluminum; after the pure aluminum is smelted, heating to 780 to 800 DEG C, and adding an Al-Mn intermediate alloy, an Al-Bi intermediate alloy and Al-Y intermediate alloy; after the alloys are smelted, adding a refining agent for refining and slag removal; stewing for 8 to 12 min, reducing the temperature to 730 to 750 DEG C, and then performing die casting forming to prepare the die-cast aluminum alloy, wherein the mass of each added material and a ratio of each element in each intermediate alloy in the die-cast aluminum alloy are as follows: 0.8 to 1.5 percent of Mn, 0.4 to 0.9 percent of Y, 0.2 to 1.2 percent of Bi, and the balance of Al. The die-cast aluminum alloy prepared by the invention is high in die casting performance, and can realize anodic oxidation, and no flow lines are produced during die casting.

Description

【Technical field】 [0001] The invention relates to alloy materials, in particular to a die-casting aluminum alloy and a preparation method thereof. 【Background technique】 [0002] The preparation methods of aluminum alloy mobile phone structural parts mainly include die-casting, extrusion + CNC and other processes. Although the extrusion + CNC process can obtain a better anodic oxidation effect, the CNC processing volume is large and the cost is high, while the die-casting process is low in cost. , because the surface die-casting flow marks are difficult to eliminate, and a good anodizing effect cannot be obtained. [0003] At present, a variety of new anodic die-casting aluminum alloys have been developed in the industry, generally containing elements such as Zn, Mn, Mg, Co, Fe, etc. The tensile strength is generally in the range of 120-200 MPa, and the die-casting performance needs to be improved. In addition, when the currently developed die-casting aluminum alloy is appl...

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Problems solved by technology

[0002] The preparation methods of aluminum alloy mobile phone structural parts mainly include die-casting, extrusion + CNC and other processes. Although the extrusion + CNC process can obtain a better anodic oxidation effect, the CNC processing volume is large and the cost is high, while the die-casting process is low in cost. , because the surface die-casting flow lines are difficult to eliminate, and a good anodizing effect cannot be obtained

[0003] At present, a variety of new anodic die-casting aluminum alloys have been developed in the industry, generally containing elements such as Zn, Mn, Mg, Co, Fe, etc., and their tensile strength is generally in the range of 120-200MPa, and the die-casting performance needs to be improved

In addition, when the currently developed die-casting aluminum alloy is applied to thin-walled mobile phone structural parts, the surface die-casting flow marks are serious, and a good anodic oxidation appearance effect cannot be obtained, which restricts the application of this process on mobile phone structural parts and cannot be industrialized

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