Precision die casting process for rare earth aluminum alloy automobile seat belt mandrel

Abstract

The invention discloses a precision die casting process for a rare earth aluminum alloy automobile seat belt mandrel. The novel die-casting aluminum alloy adopts a rare earth element as an aluminum die-casting alloy element, and by adoption of the precision die casting process technology, parts are formed directly by precision die casting. The process comprises the steps: (1) firstly smelting theconventional die casting aluminum alloy raw and auxiliary materials at the temperature of 650-700 DEG C; (2) performing the necessary slag removal, exhausting and other treatment according to the conventional aluminum alloy die casting smelting process; (3) preparing the rare earth element from, by weight, 0.20-0.40% of silicon, 0.15-0.50% of manganese, 0.10-0.30% of zirconium, 0.10-0.30% of bismuth, and up to 0.01% of titanium; (4) stacking a rare earth intermediate alloy on the position, 15 cm away from the furnace wall, of the aluminum alloy liquid surface, and then using a graphite bell jar (or an iron bell jar) to press the rare earth intermediate alloy into an aluminum alloy melt, and evenly and slowly stirring the mixture along the periphery at the position 10-15 cm away from the furnace wall; (5) raising the temperature to 750-800 DEG C for the metamorphism process, and performing standing for 2-4 hours after the deterioration; and (6) performing die casting.

Description

technical field [0001] The invention relates to a precision die-casting process of a rare-earth aluminum alloy automobile safety belt mandrel, which belongs to the field of machinery manufacturing. Background technique [0002] At present, the material used in the scientific research and production of the international automobile seat belt mandrel is mainly cast aluminum alloy, and the mainstream technology is to prepare and shape through T5 or T6 heat treatment. Ordinary cast aluminum alloys have low mechanical properties, large application limitations, and are difficult to adapt to large-scale production, while heat treatment forms have low yields, many processes, and high costs, all of which restrict the development of automotive seat belt die-casting technology. Contents of the invention [0003] The problem to be solved by the present invention is to provide a precision die-casting process for the mandrel of a rare earth aluminum alloy automobile seat belt, a new type...

AI Technical Summary

Problems solved by technology

This greatly simplifies the process flow, not only solves the problems of low mechanical properties and large application limitations of ordinary cast aluminum alloys, but also solves the problems of traditional safety belt mandrels with many processing steps, low yield and difficulty in mass production