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Introduction of nodular coated sand casting process:
Film-coated sand: The surface of the sand grains is covered with a layer of solid resin film or core sand before modeling. There are two coating processes: cold method and thermal method: the cold method uses ethanol to dissolve the resin, and adds urotropine during the sand mixing process, so that the two are coated on the surface of the sand particles, and the ethanol is volatilized to obtain the coated sand; The method preheats the sand to a certain temperature, adds resin to melt it, stirs the resin to cover the surface of the sand particles, adds an aqueous solution of urotropine and a lubricant, cools, crushes, and sieves to obtain coated sand. Used for casting steel and cast iron.
1. Vibration sand removal, high strength, low gas generation and low expansion;
2. Good dispersion and high surface finish of castings;
3. The shell can not afford layers, good thermal stability, good thermal conductivity and good fluidity;
4, shell type can not afford layers, good thermal stability, smooth surface of the casting, good thermal conductivity;
5, high strength, high temperature resistance, low expansion, good mold release, good sand resistance;
6, the shell layer is not husk uniform, fast curing speed
The coated sand is mainly made of high-quality natural quartz sand as raw sand, thermoplastic phenolic resin, urotropine and reinforcing agent as raw materials. According to the user's different technical requirements, the proportion is appropriately adjusted in terms of curing speed, film release, fluidity, disintegration, surface smoothness of castings, storage, etc. It is one of the best molding materials for automobiles, tractors, and hydraulic parts. Mixing method of coated sand: It has gone through 4 stages of dry mixing method, cold coating method, warm coating method and hot coating method. At present, almost all of the production of coated sand adopts hot coating method. The thermal film coating process is to first heat the raw sand to a certain temperature, and then mix and stir with the resin, the aqueous solution of urothine, and the calcium stearate, and then cool, crush and sieve. Due to different formulations, the mixing process is different. At present, there are many types of coated sand production lines in China. There are about 2,000 to 2,300 semi-automatic production lines with manual feeding, and there are already nearly 50 computer-controlled full-automatic production lines, which effectively improve production efficiency and product stability. The coated sand process is increasingly recognized by more foundries. This process is now being developed into the foundry valve industry. General valves such as valve plates, the previous FU process, was manually sanding with aluminum molds, and then there was the modeling machine. This year, due to the lack of stylists, the styling workers are generally aging. According to the current situation, the technical department and manufacturers continue to develop The design of the covered sand process replaces the artificial sand turning model. This process has less labor, high efficiency, high surface finish, and high utilization rate of molten iron. The general small valve body is 2 inches, one type is 16 pieces, and it can be stacked up to 15 layers /. The casting has a good geometric size. However, during the pouring process, the temperature of the molten iron and the pouring speed of the worker must be optimistic. This directly leads to the survival rate of the casting. The coated sand shell core machine greatly reduces labor intensity.
Jianxin Foundry is a well-known manufacturer and exporter of cast iron platforms and cast iron measuring tools in North China. Product line includes cast iron platform flat plate, 3D flexible welding platform, test platform, iron floor, three coordinate measuring platform, T-slot assembly platform, inspection marking platform, T-slot ground rail, machine tool casting, granite platform and measuring tools He has accumulated a lot of industry experience over the years, and has made various types of cast-iron platforms for host companies such as Dongfeng Motor, Xiamen Jinlong, Jinan Heavy Truck, China Automotive Research Institute, FAW Toyota, and North Vehicle Research Institute. We are an old company with a history of nearly 40 years, and the industry reputation has been very good.
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