Low pressure casting: a high-quality metal casting process

　　Low pressure casting is a casting method that fills a mold with liquid metal under pressure and crystallizes and solidifies under pressure to obtain castings. It is a casting process that falls between gravity casting and pressure casting, and has many unique advantages.

　　The working principle of low-pressure casting is to pour the melted metal liquid into a sealed insulated crucible, and by introducing dry compressed air into the crucible, a certain pressure is formed on the metal liquid surface, causing the metal liquid to rise along the riser under pressure and smoothly fill the mold through the sprue. After the casting is completely solidified, release the pressure and allow the uncured metal liquid in the riser and sprue to flow back to the crucible, thereby obtaining the desired casting.

　　There are many advantages to low-pressure casting. Firstly, it can effectively improve the quality of castings. Due to the filling of the mold under pressure, the filling speed of the molten metal can be well controlled, thereby avoiding defects such as splashing and curling caused by the molten metal during the filling process, making the casting structure dense and uniform, and significantly improving the mechanical properties. Secondly, low-pressure casting is beneficial for achieving mechanization and automation in production, improving production efficiency. The entire casting process can be precisely controlled by computers, reducing manual intervention and lowering labor intensity. In addition, low-pressure casting can reduce the machining allowance of castings and lower production costs.

　　Low pressure casting has been widely used in aviation, aerospace, automotive, shipbuilding and other fields. For example, many key components such as car engine cylinders and wheels are produced using low-pressure casting technology. These castings not only have high quality requirements, but also have complex shapes and strict dimensional accuracy requirements. Low pressure casting technology can well meet these requirements.

　　In summary, low-pressure casting, as an advanced metal casting process, has many advantages and provides strong support for the development of the manufacturing industry. With the continuous advancement of technology and the expansion of application fields, low-pressure casting technology will play a more important role.

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