Views: 2 Author: Site Editor Publish Time: 2022-11-30 Origin: Site
Aluminum castings refer to equipment and components made of pure aluminum or aluminum alloys obtained by casting. Generally, sand molds or metal molds are used to pour heated liquid aluminum or aluminum alloy into the mold cavity, and the obtained aluminum parts or aluminum alloy parts of various shapes and sizes are usually called aluminum die castings.
Complex aluminum casting is a new technology with electromagnetic pump low-pressure casting technology as the core, aluminum smelting and molding composite purification technology and manufacturing core, and a modern technology for producing high-quality aluminum castings. The electromagnetic pump low-pressure casting molten metal transmission system has a stable flow, convenient flow control, ease of suction of molten alumina in the process and easy realization. The advantage is the automation of the use process, which not only improves the casting quality of aluminum castings, but also It can also improve the working environment. Reduce labor intensity and realize automation and modern casting production.
Purification of molten enamel alloy castings is an important part of aluminum smelting and composite purification facilities in addition to gas injection and spin foam ceramic filters with high degassing properties except for metal inclusions. In addition, it uses a new long-life lining material, and has an independent insulation/heating system that can be used for a large number of continuous production, but also for intermittent production. This technology of molten aluminum purification has high efficiency, long life, low cost effective, easy to install, use and flexible. Casting experience tells us that to solve complex problems of quality aluminum castings in three main aspects:
(1) Aluminum smelting and melting,
(2) Smooth transition of molten aluminum metal halide lamps
(3) The size and stability of the mold and sand core process.
Modeling the core manufacturing process can see a direct impact on casting quality and yield. The relationship between casting porosity, sand sticking, scarring, thermal cracking and surface quality, dimensional accuracy, and the performance of the sand used is very good. The new technology in modeling and manufacturing is the PEPSET core resin binder used in raw zirconia sand. The resin from hard sand, the difficult kind of no-bake sand mechanism, is an independent, non-hardening chemical reaction. Initially, it is time to start hardening and curing. The reaction is fast once started. So the coach bags, because in a tough, high-strength, small fat gas collapse, have good performance is the complexity of the casting surface, ensuring quality and stability of dimensional accuracy.
Cast aluminum alloy has some advantages that other castings cannot match, such as beautiful appearance, light weight, corrosion resistance and other advantages, making it widely favored by users, especially since the lightweight of automobiles, cast aluminum alloy castings have been widely used in the automotive industry Applications.
The density of cast aluminum alloy is lower than that of cast iron and cast steel, but its specific strength is higher. Therefore, the use of aluminum alloy castings under the same load conditions can reduce the weight of the structure, so aluminum alloy castings are widely used in the aviation industry, power machinery and transportation machinery manufacturing. Aluminum alloy has good surface gloss and good corrosion resistance in the atmosphere and fresh water, so it is widely used in the manufacture of civil utensils. Pure aluminum has good corrosion resistance in oxidizing acid media such as nitric acid and acetic acid, so aluminum castings also have certain uses in the chemical industry. Pure aluminum and aluminum alloys have good thermal conductivity. They are also suitable for heat exchange devices used in chemical production and parts that require good thermal conductivity on power machinery, such as cylinder heads and pistons of internal combustion engines. manufacture.
Aluminum alloys have good castability. Due to the low melting point (the melting point of pure aluminum is 660.230C, the pouring temperature of aluminum alloy is generally about 730-750oC), so casting methods such as metal mold and die casting can be widely used to improve the internal quality, dimensional accuracy and surface of castings. cleanliness and productivity. Due to the large solidification latent heat of aluminum alloy, under the same weight conditions, the solidification process of aluminum liquid lasts much longer than cast steel and cast iron, and has good fluidity, which is beneficial to casting thin-walled and complex-structured castings.
Cast aluminum alloy castings have many advantages, making it one of the most popular casting products for the development direction of the foundry industry and purchasing customers. In the future, with the advancement of aluminum alloy casting technology, it will show itself on a larger stage style.
Analysis of urgent problems to be solved in the future development of domestic aluminum alloy casting industry
Reducing energy consumption, reducing environmental pollution and saving limited resources is a very important and urgent task facing all countries today. Driven by the general trend of lightweighting of automobiles and other products, it can be expected that my country's light metal casting market will develop substantially in the next 10 years. The proportion of aluminum and magnesium alloy castings in each major casting production country is between 13% and 19%, and some countries (such as Italy) are as high as 30% to 40%, while the proportion of aluminum and magnesium alloy castings in my country is not high. to 10%. More than 90% of aluminum castings in developed countries are used in the automobile parts manufacturing industry. In my country, there are still many problems to be solved in order to form large-scale production of aluminum alloy castings and meet the requirements of lightweight automobiles: First, the requirements of automobiles for aluminum castings Thin wall, complex shape, high strength, high quality direction. In order to meet this requirement, the casting process should be further optimized and the development of new alloy materials should be carried out. Second, the production cost should be reduced from the perspective of design and process, such as using one-mold multi-piece technology and automation technology to increase productivity, prolong the service life of the mold, and adopt an integrated design to reduce the number of parts. Third, use computer simulation technology to shorten the development cycle of process solutions. Fourth, increase the recycling of aluminum. Recycled aluminum is the main raw material for aluminum casting. While developing the foundry industry in my country, we should pay attention to the utilization of recycled aluminum resources, develop technologies for effectively separating aluminum from composite materials and waste materials combined with dissimilar materials, and establish a wide range of waste recycling systems.