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Definition and production of mold cavity in casting

超级管理员 Views:65 Release time:2024-09-24
In the casting process, the mold cavity refers to the space within the mold that forms the shape of the casting. This space is typically pre-designed and machined into the mold. Here are detailed aspects of the mold cavity in casting:


  1. Definition:
    The mold cavity is the actual space where the casting takes shape. Molten metal is poured into this space, where it cools and solidifies into the desired shape.
  2. Components:
    • Mold Body: Made of high-temperature-resistant materials such as sand, metal, or ceramic.

    • Core: Utilized to create complex structures or cavities within the casting.

    • Gating System: Includes gates, runners, and risers to direct the flow of molten metal into the cavity and ensure the evacuation of trapped air.

  3. Manufacturing:
    • Sand Casting: The cavity is typically formed through molding and sand molding processes.

    • Metal Mold Casting: The cavity is directly machined into the metal mold, offering higher precision and repeatability.

    • Ceramic Mold Casting: Suitable for casting special high-temperature alloys, with the mold made of high-temperature-resistant ceramic material.

  4. Design Considerations:
    • The design of cavities and cores must account for the shrinkage rate of the casting to ensure dimensional accuracy.

    • Good metal flow must be ensured to prevent casting defects such as porosity, inclusions, and cold shuts.

    • The mold should be designed for ease of machining and disassembly to improve production efficiency and reduce costs.

  5. Mold Maintenance:
    • Molds need regular inspection and maintenance to extend their service life. Cleaning and repairing the cavity are crucial to avoid defects during production.


The mold cavity plays a critical role in producing high-quality castings and is a decisive factor in the geometric shape and dimensional accuracy of the final product.