Sand casting process for large-size aluminum alloy thin-wall part

Abstract

The invention discloses a sand casting process for a large-size aluminum alloy thin-wall part and aims to provide the sand casting process, which realizes good finished product quality, for the large-size aluminum alloy thin-wall part. The sand casting process comprises the following steps: (I) manufacturing a sand mold; (Ii) smelting aluminum alloy and performing exhausting and slag discharging treatment; and (III) performing cast molding. By repeated research experiments and systematic data organization of experimenters and by optimizing various aluminum alloy casting processes, the sand casting process disclosed by the invention solves the problem that a large-size aluminum alloy cast piece has many defects, especially various problems such as incomplete casting of a thin-wall part, generation of air holes, mixing of sand and poor surface molding.

Description

technical field [0001] The invention relates to the technical field of casting aluminum alloys, in particular to a sand mold casting process for large aluminum alloy thin-walled parts. Background technique [0002] At present, the molding technology of aluminum alloy castings is developing rapidly, and the technology is relatively mature, such as extrusion molding, rolling, low-pressure casting, gravity casting, etc. Generally, the metal mold die-casting used for large thin-walled castings, the surface of the pressed parts The quality is good, the internal structure is uniform, and it is an ideal casting process for thin-walled parts. However, the mold opening cost is relatively high, and if there is no large-scale production, the casting cost is relatively high. In actual production, before large-scale production, it is often necessary to carry out experimental production to determine the pouring process, so small batch production is often cast through sand molds . [000...

AI Technical Summary

Problems solved by technology

However, the mold opening cost is relatively high, and if there is no large-scale production, the casting cost is relatively high. In actual production, before large-scale production, it is often necessary to carry out experimental production to determine the pouring process, so small batch production is often cast through sand molds

[0003] Sand mold aluminum-copper alloy metal castings have common disadvantages of poor fluidity, poor surface molding quality, and castings should not be too large, especially for large thin-walled parts with a thickness of 5mm~15mm. The difficulty of pouring and molding is doubled. Dissatisfaction or pouring boundary delamination defects sometimes occur in thin-wall casting, and the casting yield is generally lower than 90%

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