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　　The Structure of Low-Pressure Die Casting Molds

　　The structure of low-pressure die casting molds has some distinct characteristics. Firstly, the pressure chamber is a key component. It is where the molten metal is held and pressurized. The pressure chamber is connected to the mold cavity through a riser tube. The molten metal is forced up the riser tube and into the mold cavity under low pressure. The mold cavity in low-pressure die casting molds is designed to allow for a gentle and controlled filling of the molten metal. This helps to reduce turbulence and the formation of defects such as porosity and inclusions.

　　The runner system in low-pressure die casting molds is relatively simple compared to some other die casting methods. Since the metal is pushed into the cavity under low pressure, the runner design can be more straightforward. However, it still needs to ensure proper distribution of the metal. The ejector system is similar to that in other die casting molds, consisting of ejector pins and related components to remove the casting from the mold. Cooling channels are important to control the solidification rate of the casting. The low-pressure process may require a different cooling strategy compared to high-pressure die casting to achieve the desired microstructure and mechanical properties of the casting. The mold base and overall structure need to be strong enough to withstand the pressure exerted during the casting process. Additionally, the sealing of the mold is crucial to prevent leakage of the molten metal. Special seals and gating mechanisms are used to ensure a tight seal between the pressure chamber and the mold cavity and between different parts of the mold.

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