In the process of jewelry casting, flash and burrs attached to parting surfaces or hole edges are like rough "excrescences" that compromise the dimensional accuracy and surface quality of castings. These excess thin metal residues on casting edges are invisible profit drains—they not only lead to high rework costs but also cause mass production issues or even batch scrapping, becoming a fatal blow to customer trust. As a craftsmanship-focused factory with over 20 years of experience in precision jewelry casting, Yihui Casting emphasizes that solving flash and burr problems is far from merely grinding them away. It requires us to go beyond the surface and conduct a systematic traceability from design origins, mold tools, process parameters to process control. This article clarifies the generation mechanism of these two common defects and explores fundamental solutions to eliminate their root causes, helping jewelry manufacturers upgrade jewelry casting quality.
The occurrence of such jewelry casting defects mainly stems from the following factors, which are closely related to mold stability and process standardization:
Unreasonable ratio of casting powder to water, specifically excessive water dosage that weakens mold structure.
Mold flasks with mixed casting powder are moved, tilted during the standing stage, or the standing time fails to meet standard requirements, resulting in unstable mold cavity formation.
Excessively fast heating rate of the casting oven, exceeding the tolerance range of the mold and causing internal cracks.
Mold flasks are placed for too long before entering the oven, leading to dry cracks inside the mold cavity.
Insufficient binder concentration for platinum casting powder, which cannot ensure the integrity of the mold cavity structure and further triggers internal cracking.
To address the above causes, the following targeted measures can fundamentally avoid the occurrence of casting defects, aligning with Yihui Casting’s intelligent casting process optimization standards:
Optimize casting powder-water ratio: Appropriately reduce water dosage to comply with casting powder usage specifications, laying a stable foundation for mold cavity formation. Yihui Casting recommends referring to the technical parameters ofhigh-quality jewelry casting powder for precise proportioning.
Standardize mold flask standing process: After mixing casting powder, mold flasks must stand for a full hour, and moving is strictly prohibited throughout the process. This avoids mold cavity instability caused by external interference or insufficient standing time, a key part of Yihui’s jewelry casting process control.
Scientifically control oven heating: Implement staged heating in strict accordance with specified procedures to avoid mold cavity damage from rapid temperature rise. Yihui’s intelligent casting oven temperature control systems can automatically regulate heating rates to match mold tolerance.
Strengthen mold flask storage protection: If mixed mold flasks are not to be cast on the same day, cover their surfaces with a wet towel to slow down water evaporation in the mold cavity and prevent dry cracking—an essential tip for traditional casting process upgrading.
Enhance binder concentration: Reduce water addition during binder dilution to ensure the binder fully maintains mold cavity integrity and avoids internal cracking. This is particularly critical for platinum jewelry casting, which has higher requirements for mold stability.
In practical operations, strict implementation of the above measures is essential, along with strengthened process control at all stages. Every operation must comply with jewelry casting quality standards to fundamentally improve casting quality and reduce defects. Yihui Casting has long integrated these solutions into its production system, relying on tech-empowered casting processes to help customers reduce rework costs and enhance batch production stability.
Yihui Casting Technology Co., Ltd. was established in 2003. After more than 20 years of accumulation, Yihui has now developed into a national high-tech enterprise that integrates research and development, production, sales, consulting, installation, and training of lost wax casting equipment, and provides one-stop solutions for metal casting. Yihui Casting Technology products include metal casting equipment, casting wax, graphite products, quartz products, etc., which are exported to Southeast Asia, the Middle East, Europe, America and other regions. The company has its own R&D team, which independently develops and produces automated vacuum die-casting machines, G20 vacuum bead scattering machines, and intelligent system D3 vacuum pressure casting machines, breaking the industry's long-standing dependence on imported high-performance jewelry equipment.
For more information about Yihui Casting Technology Co., Ltd., please visit our official website or contact our team.website: www.yihuicasting.com email : info@yihuicasting.com whatsapp : +86-13802830498
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