Aluminium alloy, core support prepared by same for forming of aluminum alloy casting and preparation of core support

Abstract

The invention relates to an aluminium alloy which comprises the following components by mass: 11-13% of Si, 0.15-0.30% of Mg, 86.7-88.85% of Al. Because the aluminium alloy provided by the invention has a melting temperature range lower than the pouring temperature of a casting aluminum alloy, the treated surface is easy to be melted by high-temperature casting aluminium alloy liquid and fused with a casting aluminum alloy matrix, and the technical problem of the poor fusion of a core support and an aluminium alloy casting body in the forming of a confined aluminum alloy casting in the prior art is effectively solved; and simultaneously, with the core support manufactured by the aluminium alloy, liquid flow stratifiedly flows as laminar flow when passing through the comb holes of the core support, and the flow process is subject to both the gravity action of the upper layer and the uplift action of the lower layer, which can effectively overcome the surface tension effect of liquid flow between layers and avoid the generation of stratified cold shut. The defect that existing core support always has incompact gaps which are easy to form cold shuts is effectively solved, and the internal quality requirements for confined castings are satisfied.

Description

technical field [0001] The invention belongs to the field of casting, and relates to an auxiliary material which is especially suitable for the casting and forming of aluminum alloy castings with pressure bearing requirements, and can also be used in the casting and forming of general aluminum alloy castings, specifically an aluminum alloy, which is made of The core support used for aluminum alloy casting forming and the preparation of the core support. Background technique [0002] In the process of casting production, the sand core is mainly fixed by the core head in the cavity, but sometimes it is difficult to stabilize the sand core only by the core head positioning, so the core support is often used to reinforce the sand core in production to play the role of auxiliary support. [0003] In the application of the core support, attention should be paid to two aspects of strength and fusion with the casting body. First of all, before the casting in the cavity is completel...

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Problems solved by technology

[0006] The purpose of the present invention is to provide an aluminum alloy with a suitable melting point and a core brace for forming aluminum alloy castings made of it, so as to solve the poor fusion between the core brace and the aluminum alloy casting body in the forming of pressure-bearing aluminum alloy castings in the prior art , There are always non-dense gaps, cold shut defects, and technical problems that cannot meet the pressure requirements, so as to improve the metallurgical bonding degree of the casting body and the core support fusion interface, and meet the internal quality requirements of aluminum alloy pressure castings

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