Give full play to the advantages of the alkaline phenolic resin process
Zhang Kefeng, deputy general manager of Jinan Shengquan Group Co., Ltd. (hereinafter referred to as Zhang Zong) comprehensively analyzed the characteristics of alkaline phenolic resin, the problems to be paid attention to, and the key control measures in production, and gave relevant application cases. The advantages of using basic phenolic resins provide a practical solution.
At the beginning of the 21st century, alkaline phenolic resin was applied in domestic joint ventures and wholly-owned foundries. Most of the new cast steel mills or water glass sands were refurbished, mainly used in cast steel, cast iron and non-ferrous alloys. .
The alkali phenol resin process has the following characteristics:
(1) The resin does not contain nitrogen, and the curing agent does not contain S or P, which avoids defects such as tissue deterioration, thermal cracking and nitrogen pores caused by the increase of S on the surface of the casting.
(2) The hardening system has a thermoplastic and secondary hardening process at a high temperature, and therefore, thermal cracking and burr defects of the steel casting and the ductile iron casting can be greatly reduced.
(3) The process does not produce harmful and irritating gases during sand mixing, molding, core making and casting, and significantly improves working conditions.
(4) Good collapsibility, reduce the time for clearing sand, and improve labor efficiency.
(5) A variety of raw sand can be used, which has good adaptability to the original sand.
(6) The amount of addition is too large.
(7) Sand regeneration performance is inferior to furan resin.
In view of the characteristics of the alkali phenol resin process, there are some problems to be concerned in the actual production: First, it is necessary to fully recognize the importance of vibration and compaction during molding and core making. Higher firmness not only improves core strength and surface quality, but also reduces sticking and porosity defects, reducing resin usage and coating consumption. The second is to fully realize the importance of the classification and management of core sand. On the one hand, it can make the best use of it and reduce waste; on the other hand, it can reduce the regeneration pressure and achieve a virtuous cycle. The third is sand regeneration. The alkali phenolic resin film has good toughness and the sand regeneration effect is worse than that of the furan resin. Therefore, it is necessary to adopt comprehensive measures such as ensuring the quality of the original sand, selecting the superior grade regeneration equipment, reducing the amount of resin added, reducing the ratio of sand to iron, and strengthening the maintenance of the regeneration equipment.
In addition, enterprises should strengthen material consumption management to reduce costs and reduce waste. At the same time, it is necessary to have suitable equipment and methods, such as the use of curing speed automatic regulator, automatically adjust the amount of curing agent according to the amount of resin added, and remotely monitor the operating state of the equipment.
The alkali phenolic resin self-hardening sand process is rapidly expanding its application range with its unique advantages. However, we must pay attention to some problems in use, such as sand regeneration, core sand classification, material consumption management, etc., and take corresponding measures to give full play to the advantages of the process.
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