Precautions for die-casting parts
Release time:2025-08-08
Design Considerations for Die-Cast Parts
When designing die-cast components, it's essential to account for the unique characteristics of the die-casting process to ensure high-quality, cost-effective, and manufacturable parts. Below are key design guidelines:
Wall Thickness:
- Maintain uniform and appropriate wall thickness. Avoid excessively thin walls (which may lead to incomplete filling) or thick sections (which can cause shrinkage porosity and longer cycle times). Typical wall thicknesses range from 1–4 mm depending on the alloy and part size.
Fillets and Corners:
- Use generous fillets (rounded corners) instead of sharp internal or external corners. This improves metal flow, reduces stress concentration, and enhances structural integrity.
Draft Angles:
- Incorporate adequate draft angles (typically 1°–3°) on vertical surfaces to facilitate part ejection and prevent damage to the casting or mold.
Ribs and Structural Features:
- Use ribs to increase stiffness and strength without increasing wall thickness. Ribs should be 40–60% of the nominal wall thickness and properly spaced to avoid sink marks and porosity.
Holes, Bosses, and Pockets:
- Minimize deep holes or deep pockets, as they can cause filling issues and porosity. If required, consider core pins and ensure proper venting. Design bosses with consistent wall thickness and sufficient draft.
Gate, Runner, and Venting System:
- Design the gating system, turbulence-free metal flow into the cavity. Proper runner layout and venting help minimize air entrapment, cold shuts, and oxide formation.
Material Selection:
- Choose the appropriate alloy (e.g., aluminum, zinc, magnesium) based on mechanical properties, corrosion resistance, weight, and casting behavior (e.g., fluidity, shrinkage).
Tolerances and Surface Finish:
- Specify realistic dimensional tolerances and surface finish requirements. Die casting can achieve good surface quality, but tighter tolerances may require secondary machining.
Mold Life and Manufacturability:
- Design for mold longevity by minimizing stress on mold components, avoiding thin or weak mold sections, and using appropriate parting lines.
Minimize Secondary Operations:
- Design the part to reduce the need for post-casting machining, drilling, or assembly, which can increase cost and complexity.
By following these principles, engineers can design die-cast parts that are robust, cost-effective, and optimized for high-volume production.
Henan Yuanfei Metal Material Co., Ltd.
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