コアは複雑な鋳造形状の形成にどのような役割を果たしますか？
The Functional Role of Cores in Die Casting
Cores are essential negative-form inserts used in die casting molds to create internal features and complex geometries that cannot be formed by the basic mold cavity alone. They enable hollow sections, undercuts, internal threads, through-holes, and lightening pockets. Without cores, die-cast parts would be largely limited to solid or simple open shapes. Strategic core design during the Tool And Die phase transforms a basic mold into a near-net-shape component, often minimizing the need for subsequent Post Machining.
Types of Cores and Their Application
Cores are categorized based on material and operation:
Fixed Cores: Made from hardened steel and permanently mounted, used to form static internal passages.
Retractable/Movable Cores: Mechanically or hydraulically actuated to slide into position before injection and retract after solidification, forming undercuts and complex internal channels.
Sand Cores: For internal geometries that cannot be ejected with standard metal cores, Sand Casting techniques can be integrated. Sand cores are broken and washed out post-casting, enabling complex features in Aluminum Die Casting, Zinc Die Casting, and Copper Die Casting.
Enabling Design Complexity and Part Consolidation
Advanced core use enables part consolidation, allowing a single die-cast component to replace multiple fabricated pieces. For example, in our Gigabyte Custom GPU Frame, cores produce precise mounting points and structural ribs in one shot. Similarly, cores allow the creation of internal mechanisms and aesthetic details in the Chanel Perfume Bottle Cap. This capability is central to our die castings Design service, where part geometry is optimized for manufacturability from the outset.
Core Design and Tooling Considerations
Effective core design requires precise engineering. Cores must account for material shrinkage, include drafts for ejection, and withstand high-pressure and thermal shock during molten metal injection. Materials like H13 Steel are chosen for high-temperature strength and thermal fatigue resistance. Proper venting is critical to allow air and gases to escape from deep cavities, preventing defects. Precision tooling ensures successful Mass Production of intricate die-cast components.
