Introduction to the method of aluminum alloy
Method to solve casting porosity First analyze the r...
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Sand foundry uses clay-bonded sand as a modeling material to produce aluminum alloy castings. It is a process with a long history and the most widely used process. Speaking of a long history, it can be traced back thousands of years; in terms of its scope of application, it can be said that it is used everywhere in the world. It is worth noting that today, with the vigorous development of various chemically bonded sands, clay green sand is still the most important modeling material. Its wide application range and large consumption make it unmatched by any other modeling material. of.
The ability to adapt to modeling conditions is extremely strong, which is also a major feature of clay green sand. In 1890, the shock pressure molding machine came out. The clay green sand, which has been used for manual molding conditions for a long time, was extremely successful in machine molding, and laid the foundation for the mechanization and automation of subsequent molding operations. Modern high-pressure modeling, jet-pressure modeling, air-punching modeling, static pressure modeling, and non-shock vacuum pressure modeling are all based on the premise of using clay green sand.
The implementation of various new processes has made clay green sand more important in casting production, and it has also caused clay green sand to face many new problems, prompting us to continuously strengthen the research and understanding of clay green sand.
Nowadays, with the rapid development of science and technology, the demand for aluminum castings in various industrial sectors continues to grow, and at the same time, the requirements for the quality of aluminum castings are getting higher and higher. Modern foundries have widely used gravity casting and low-pressure casting processes to produce aluminum castings. The aluminum castings produced by these processes have good appearance and high dimensional accuracy. If the manufacturer has sufficient production technology, the internal quality of the castings produced by the gravity casting and low-pressure casting process can also be comparable to aluminum forgings, without any sand holes and pores.
because each sand mold can only be poured once, the mold is damaged after the casting is obtained and must be reshaped, so the production efficiency of sand casting is low; and because the overall nature of sand is soft However,Jason Response
Aluminum sand casting is a traditional casting process that uses sand as the main modeling material to make molds. This kind of craft is also a popular craft in the market, and we can see products cast by this craft in our lives, such as the relatively hot cast aluminum doors. Let’s take a look at the principle of sand casting process together:
Sand casting mainly adopts the gravity casting process-gravity casting refers to the process of injecting molten metal into the mold under the action of the earth’s gravity, also called casting. Gravity casting in a broad sense includes sand casting, metal casting, investment casting, mud casting, etc.; gravity casting in a narrow sense refers specifically to metal casting. Gravity casting is generally used for sand molds, and low-pressure casting, centrifugal casting and other processes can also be used when there are special requirements. Sand casting has a wide range of adaptability, small pieces, large pieces, simple pieces, complex pieces, single pieces, and large quantities can be used.
The molds used for sand casting were mostly made of wood in the past, and they are commonly called wooden molds. The disadvantage of wooden molds is that they are easily deformed and damaged; in addition to single-piece sand castings, aluminum alloy molds or resin molds with higher dimensional accuracy and longer service life can be used. Although the price has increased, it is still much cheaper than the mold for metal casting. In the production of small batches and large parts, the price advantage is particularly prominent. In addition, sand molds have higher refractoriness than metal molds, so materials with higher melting points such as copper alloys and ferrous metals also use this process.
However, sand casting also has some shortcomings: because each sand mold can only be poured once, the mold is damaged after the casting is obtained and must be reshaped, so the production efficiency of sand casting is low; and because the overall nature of sand is soft However,