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EspañolThe basic principles of metal flow in Gravity Casting Mold are one of the keys to the successful implementation of this process. The metal enters the mold by gravity during the casting process, ensuring the correct shape and structure of the final part.
Rheological properties of metallic liquids
The rheological properties of metallic liquids are one of the basic principles of metal flow. Metals exhibit unique rheological behavior in the liquid state. Its main characteristics include:
Viscosity and Flowability: The viscosity of metallic liquids is relatively low, which allows the metal to flow freely under certain conditions. The fluidity of different metals varies, but in general, lower viscosity facilitates flow.
Effect of temperature on fluidity: As the temperature increases, the fluidity of metals increases. In Gravity Casting Mold, the metal needs to be heated to a high enough temperature to bring it to a liquid state and maintained within a sufficient temperature range to ensure fluidity.
Effect of Gravity on Metal Flow
Gravity Casting Mold's name contains "Gravity," which refers to the main driving force for metal flow. The action of gravity causes the liquid metal to flow from top to bottom along the guide structure of the mold, filling the entire mold cavity. Compared with other casting processes, Gravity Casting Mold relies on the gravity of the earth and does not require additional pressure equipment, simplifying the process.
Gravitational potential energy: By flowing from a higher position to a lower position, the potential energy of metal is converted into kinetic energy, pushing the metal to flow. When designing the mold, you need to consider the flow path of the metal in the mold to maximize the use of gravity.
Effect of mold structure on metal flow
The mold structure of Gravity Casting Mold plays a key role in guiding and controlling metal flow. Here are some key factors in mold construction:
Gate design: The gate is the channel through which metal enters the mold. Its design needs to consider the direction, speed and resistance of metal flow. Excellent gate design helps ensure that metal fills the mold cavity at a uniform rate, preventing gas from mixing in and creating defects.
Guide structure: The guide structure within the mold determines the flow path of the metal. The carefully designed guide structure can avoid turbulence during the flow of metal and ensure the smoothness of metal flow.
Mold cavity design: The shape and size of the mold cavity has a direct impact on the metal flow and solidification process. Reasonable mold cavity design can ensure that the metal forms the required part shape in the mold.
Effect of surface tension
The surface tension of metal liquid is another important factor affecting metal flow. Surface tension is the result of molecular interactions at the surface of a liquid and usually appears as a thin film on the surface of the liquid.
Surface coating: By coating special materials on the surface of the mold, the surface tension can be changed, reducing the resistance to metal flow, making it easier for the metal to flow into the mold.
Wettability: The wettability of metal on the mold surface affects the flow of metal inside the mold. Excellent wettability helps the metal fill the mold better.
