Aluminum casting industry knowledge

The wastes in the aluminum casting industry mainly include: waste sand, waste residue, dust, and exhaust gas. According to statistics, for every 1 ton of qualified castings produced in China, about 50 kilograms of dust, 1000-2000 cubic meters of waste gas, 1 to 1.3 tons of waste sand, and 300 kilograms of waste slag are discharged. The total amount of pollutants discharged by the entire aluminum casting industry in 2006 was about 1.5 million tons of dust, 30 billion to 60 billion cubic meters of waste gas, 30 million tons of waste sand, and 9 million tons of waste residue, which is 10 times that of some industrial developed countries. . Although China's current large-scale enterprises have the same level of technological equipment as the internationally advanced aluminum casting enterprises, there are still a large number of enterprises whose technological equipment is backward or even rudimentary. Effectively improving the efficiency of energy and raw materials use in the context of climate change, energy development, and rising raw material prices, it is also necessary to respond to the changing raw material base in recent years. Energy, raw and auxiliary materials, and scrap prices have been in recent years. It has grown exponentially and must therefore be technically responsive in order to remain competitive in terms of international competitiveness and in other areas of manufacturing technology. The aluminum casting industry has a lot of effective improvement potential in this regard.In many places in daily life, such aluminum castings are needed. For example, in the automobile industry, most of the internal pipe fittings of the automobile are made of such aluminum parts, and aluminum parts are made. Automotive pipe fittings are durable and resistant to rust. In addition, this aluminum part can be used in many other areas, such as metallurgy, machinery, construction, and chemical industries. Since the invention of the casting process, aluminum parts have brought good news to all walks of life, and all industries have to use it.Aluminum castings generally have to bear a large load, and the quality can not be too large for handling, so the product generally requires a metal casting process, but in actual production, the pouring and blasting system is still formed in the sand mold. Since the pouring and blasting system is generally arranged above the casting, the casting of the slab type is subject to load, and there are many partitions inside, and the structure is relatively complicated, so that in the case of the top liquid, the cavity will be severely generated in the cavity. Turbulence phenomenon, oxidation inclusions are more serious. In the process design of this type of aluminum castings, the following factors should be noted: First, a large machining allowance is left on the upper surface of the aluminum casting to remove the oxidized inclusions floating on the top as much as possible. Second, for large aluminum castings with a large number of partitions, it is important to avoid the occurrence of insufficient casting defects. The exhaust of the casting itself is very important. Thirdly, when using the metal casting top injection process, in the case of not being able to set enough risers, a funnel-shaped runner can be arranged in a key part, and as the liquid level in the runner continuously sinks, multiple filling is performed to achieve sufficient The effect of feeding.