Interpretation of common problems of die casting aluminum alloy (2)

Second, discussion on the extension and development of die-cast aluminum alloy

1. Overview:

In recent years, there have been many discussions on the extension and development of die-casting aluminum alloy, and many research units and campuses have done many effective operations and attempts, and achieved gratifying results. As far as the development of the entire die-casting aluminum alloy is concerned, improving the function and process level of its materials is the key to expanding the use of aluminum alloy die-casting. Key parts such as cylinder block and gearbox shell have been successfully produced in large quantities in the pillar industry, and the batch of sophisticated production of wheel hubs and a large number of exports to Europe and the United States, which have opened up a vision for the lightweight of cars, but how to extend the die casting parts from the car starter to the whole vehicle to extend the original deformed aluminum alloy welding parts. Riveted parts and stamping parts are replaced by die-cast aluminum alloy, so as to play the advantages of overall enhancement of die-casting parts, good rigidity and further reduction of weight, improve production efficiency, etc., the experience of European and American countries, especially Germany, indicates all this, so it is necessary to greatly improve the plasticity of die-cast aluminum alloy to the elongation of more than 10% and require its strength to match.

2. Trial production and development of high plastic die casting aluminum alloy:

The requirements of high plasticity of die casting aluminum alloy are the necessary requirements for the in-depth development of die casting parts, and also the only way to expand the use of aluminum alloy die casting, and the practice over the years indicates that it is also the bottleneck on the road to die casting. We have communicated with GM Company in the United States to understand their basic requirements for high plastic die-casting aluminum alloy, and formulated the development plan of alloy system based on Al-si-mn-mg. After severely limiting Fe content and using Sr modification treatment, purification treatment after melting and the implementation plan of vacuum die-casting. The obtained multi-furnace test die casting and test rod and T7 solution treatment and high temperature aging treatment, and after big data processing, the analysis of the test data shows that the peak value is 18%, the furnace uniform value is 9%~12%, which is in line with the basic requirements of GM company, and further in-depth operation needs to be continued.

We also tried to produce AI-Mg-Si-Mn non-heat treatment type of high plastic die-casting aluminum alloy plan, due to the influence of magnesium oxidation combustion and slag formation at high temperature during melting, and difficult to control under factory conditions, the experimental data dispersion is difficult to find rules, so suspended, the original thought that if not heat treatment, get the high plasticity of die-casting alloy, not only reduce the process, Reduced production cycle, and more importantly, high temperature solution treatment is a difficult hurdle for die-casting alloys! However, Germany has done a lot of effective work on AI-Mg based high plastic die casting aluminum alloy, which involves the close cooperation of multiple processes. In summary, from the practical performance we have done, it is determined that the basic alloy series plan of GM company is: the selection of purification treatment and vacuum die casting in smelting, as well as the solution treatment of T7 and high temperature aging is one of the effective ways to achieve high plasticity of die-cast aluminum alloy.

Step 3 Discuss

Die-casting aluminum alloy is the main body of non-ferrous alloy die-casting, and AI-Si series alloy is the main body of die-casting aluminum alloy, die-casting industry development is a long way to go, it involves the development of high-function alloy and process development, practice shows that the combination of enterprise-centered universities and research units is a wise choice, we have achieved the relevant effects have been confirmed.

In order to achieve the revival of the entire die-casting industry, the improvement of the function of the die-casting machine, the corresponding progress in the design and manufacturing level of the die-casting mold is also very important, especially the introduction and use of many foreign skills software, which is verified by what method? It's worth considering.

The existing national standard for aluminum alloy has now lapsed and has lost reference value over the years, which is a pity! Therefore, it is urgent to organize relevant departments and relevant forces to prepare new national die-casting standards in line with the status quo of China's die-casting development and in line with the world!

Wuxi Dahao Hardware Manufacturing Co., Ltd. specializes in producing: aluminum die-casting aluminum alloy die-casting precision aluminum die-casting