Binder materials must be environmentally friendly, efficient, and energy efficient

Tang Shenglai, a technical service engineer at Bonnie Chemical (Tianjin) Co., Ltd., conducted an in-depth analysis and comparison of the current status and performance of various mainstream sand binders used in China's cast steel industry. By integrating the latest developments in the sector, he evaluated the comprehensive characteristics of different resin sands and proposed a tailored technical upgrading plan for small and medium-sized foundries. He also provided real-world implementation examples to support his recommendations. In recent years, the cast steel industry—key to China’s national economy—has faced unprecedented challenges, marking a period of major transformation. Foundries are now under pressure to improve casting quality and reliability, produce high-quality near-net shape components, enhance environmental protection, achieve clean and sustainable production, reduce costs, and shorten delivery times. These four goals have become central to the industry's development strategy. A key factor in achieving these objectives is the quality and application of molding materials. Since the 21st century, the research and application of new casting binder materials have advanced rapidly. Today, both large and small steel foundries are gradually adopting self-hardening sand technology. Traditional limestone sand and CO₂ water glass sand are being phased out, replaced by more efficient and environmentally friendly options such as water glass self-hardening sand, furan resin sand, alkali phenolic resin sand, and the newly developed Bonny resin sand process. From an industry perspective, large steel castings often use alkali phenolic resins in heavy machinery factories like Double and Too Heavy, while ester-hardened water glass sand is commonly used in companies like Tieda Machine and CITIC Heavy Industry. Railway system frame castings are typically made using mechanized molding lines with grease-hardened water glass sand. Stainless steel castings, on the other hand, rely heavily on various resin-based processes. Geographically, steel foundries in southern China predominantly use resin sand, whereas those in northern regions, including Henan, still favor water glass sand. Some steel foundries, such as Shared Casting, also use furan resin sand for large castings. Many small and medium-sized steel foundries in China lack awareness of resin sand technology and often produce lower-grade products. Additionally, they face a shortage of professional casting expertise, which keeps them reliant on traditional CO₂ water glass sand processes. However, some steel foundries in Jiangsu and Zhejiang provinces have successfully transitioned to eco-friendly adhesives through equipment upgrades and technological improvements, achieving remarkable results and setting a benchmark for others. Bonny resin is a new environmentally friendly binder specifically designed for cast steel, recently introduced by Bonnie Chemical. Structurally, it is a modified resol phenolic resin that is completely free of formaldehyde and phenol, combining the best properties of conventional resins. It offers secondary hardening, maintains strength, collapsibility, and excellent reproducibility, similar to furan resins. So far, it has been tested and applied in over 30 steel casting companies across various types of steel castings, from small parts weighing tens of kilograms to large pieces exceeding 160 tons, with impressive outcomes. As the foundry market continues to evolve and under the influence of domestic and international policies, the development of raw and auxiliary materials must keep pace. To remain competitive and preserve value, foundries need to continuously innovate. While multiple binder technologies are currently competing, the future of binder materials will likely focus on being more environmentally friendly, efficient, and energy-saving. For any foundry, understanding the selected binder and its properties is essential for successful implementation. Sustainable development demands that these materials not only meet performance standards but also align with global environmental trends.

Aluminum Precision Turned Parts

1. The hardness of the material is moderate, and the tool wear of the machining equipment and CNC machining center is small.

2. It can be precisely machined into various geometric shapes such as plane, cavity, shell, sphere, arc, and anisotropy.

3. It is not easy to stain and maintain. Aluminum precision parts, precision parts processing, CNC processing

4. It has good durability and is not easy to corrode. With special treatment process, the service life of parts is longer.

5. Aluminum is environmentally friendly and can be 100% recycled, with high recycling value.

The above five points are the material characteristics of aluminum products. Aluminum is a common material in CNC precision parts processing, with moderate hardness, durability and corrosion resistance. In addition, the cost of materials is appropriate. It is the preferred material for most parts manufacturers.

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