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Die Casting Defect Analysis: Common Issues & Solutions (二)

Building on common defects like porosity and cracks, Part 2 addresses other frequent issues affecting surface finish, dimensional accuracy, and production stability. Understanding these defects is key to optimizing the entire die casting process.

1. Cold Flakes & Poor-Flow Porosity

Primary Cause: Low metal temperature at the flow front or poor filling pattern leading to incomplete fusion.

Key Solutions: Increase molten metal temperature; optimize filling pattern and gate design; adjust injection speed profile.

2. Flash (Burrs)

Primary Cause: Insufficient clamping force; poor die alignment or fit; excessive metal temperature.

Key Solutions: Verify and adjust clamping force; check and maintain die condition; control metal temperature.

3. Soldering (Sticking) & Carbon Buildup

Primary Cause: Release agent issues (improper type, amount, or application); local die overheating.

Key Solutions: Optimize release agent selection and spraying parameters; manage die temperature; ensure good die surface finish and proper draft angles.

4. Dimensional Issues: Deformation & Incomplete Filling

Common Causes: Uneven ejection force; insufficient machine pressure; low die or metal temperature; blocked vents; improper gating.

Key Solutions: Optimize ejector pin layout and force; ensure adequate machine capacity and injection pressure; maintain optimal process temperatures; clear and design effective venting systems; review and modify gating design.

Conclusion
Effective defect control requires a systematic approach, balancing machine parameters, mold design, and process settings. As a provider of intelligent die-casting solutions, Shimi offers not only reliable equipment but also the process expertise to help you identify root causes and implement effective corrections, ensuring higher productivity and part quality.

This article is based on general die-casting process knowledge, and the solutions provided are directional recommendations. Specific applications must be evaluated based on actual equipment, mold, and material conditions.