Tang Shenglai (hereinafter referred to as Tanggong), a technical service engineer of Bonnie Chemical (Tianjin) Co., Ltd., analyzed and compared the current status and performance of several mainstream sand binders in the domestic cast steel industry, and combined with the current development of the cast steel industry. The comprehensive characteristics of each resin sand, proposed the technical reform plan of the resin sand of small and medium-sized cast steel plant, and demonstrated the implementation case.
In recent years, the cast steel industry, which is one of the basic industries of China's national economy, has encountered unprecedented challenges. It may be said that it is an industry reshuffle. Many external forces have made domestic foundries improve the quality and reliability of castings and produce high quality near net. Forming castings; strengthening environmental protection, achieving clean and sustainable production; reducing production costs; shortening delivery time four goals as their main task.
Among the factors supporting the above four objectives of the foundry, the quality and application of the modeling materials occupy a very important position. Since the beginning of the 21st century, research and application of various new casting binder materials have progressed rapidly. At present, domestic large, medium and small cast steel enterprises are gradually adopting self-hardening sand technology. In fact, the traditional limestone sand and CO2 water glass sand have been gradually eliminated in the modeling. Instead, they are widely used in several mainstream applications. Self-hardening sand binder process: water glass self-hardening sand, furan resin sand, alkali phenolic resin sand process, and new modified resol phenolic resin - Bonny resin sand process.
From the industry point of view, large steel castings use more alkali phenolic resin in several heavy machinery factories in China (represented by double and too heavy), and also use ester hardened water glass sand technology (to saddle machine total, CITIC Heavy Industry) For the representative); the railway system frame steel castings are mainly made of grease-hardened water glass sand mechanized molding line; other such as stainless steel castings are mainly based on various resin sand processes.
From the perspective of geographical nature, cast steel mills used in the southern part of the country mostly use resin sand, while cast iron mills in the north (including Henan area) use water glass sand.
There are also some cast steel mills that use furan resin sand to make large steel castings, such as shared cast steel.
Domestic small and medium-sized foundry steel mills, due to lack of understanding of resin sand, and their own product grade is not high, but also because these factories lack professional casting talents, so most of these plants stay in water glass sand (mostly blown CO2 water glass sand Process). In recent years, many steel casting factories in Jiangsu and Zhejiang provinces have taken the lead in successfully using new environmentally-friendly adhesives through equipment and technological transformation, and have achieved great results, and have been ahead of domestic counterparts.
Bonny resin is a new type of environmentally friendly cast steel special binder developed and introduced to the market by Bonnie in recent years. In terms of its molecular structure, it belongs to “modified resol phenolic resinâ€, specifically a new type. An environmentally-friendly professional cast steel resin that is completely free of formaldehyde and phenol and combines the superior comprehensive properties of conventional resins. The resin has a series of properties such as secondary hardening of the phenol resin, and maintains the strength, collapsibility, use suitability, and high reproducibility of the furan resin. At present, the resin has been used and tested in more than 30 cast steel enterprises. The products involve various types of steel castings of materials, structures and non-destructive testing grades. The weight of single pieces ranges from tens of kilograms to more than 160 tons, and has achieved remarkable results.
With the continuous development of the foundry market and the influence of international and domestic policies, we must continue to break through the development of raw and auxiliary materials for casting, in order to adapt to the progress of the outside world and retain its own value. From the current point of view, several major binder materials are competing for development, and other binders are also blooming. However, for the foundry, regardless of the binder process selected, the relevant technical and operational personnel of the factory are required. The selected process and material properties have a deep understanding and grasp. From the perspective of sustainable development, the development of binder casting materials is bound to be environmentally friendly, efficient, and energy-saving. Such materials are more vital.
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