Qingzhou Nagin New Material Technology Co., Ltd. was founded in 1982, formerly known as Wang Qingzhou Casting Co., Ltd., is casting the development, production and sales of high-tech enterprises. The main production equipment LFC molding line, resin sand molding equipment, molding clay, sand, coated sand molding equipment, intermediate frequency electric furnace smelting equipment for 3 sets, modeling workshop area of ??5000 square meters, more than 50 production workers, skilled workers, more than 10 people. The company's development objective is "to build brand strength, strong fine foundry industry." Company since its inception, has been committed to LFC process, coated sand craft, resin sand cast iron castings such as R & D and manufacturing, the company mainly produces gray ductile castings, annual production of 7000 tons. Companies rely on excellent product quality to win the broad market, has established long-term cooperative relationship with the United States Caterpillar SEM Machinery, Shandong Crane Factory, Shengli Oilfield, Dongying, Weifang Haihua other companies. The company "quality first, the user is responsible for customer satisfaction" principle of service, and constantly open up the domestic and international markets, and dedication to providing quality castings and services at home and abroad. The company mainly in gray iron, ductile iron oriented products. The main production HT150, HT200, HT250, QT400, QT450, QT500, QT600 other brands castings. Products covering all major machinery products, railway castings, road and bridge castings, engineering machinery, irrigation machinery and other infrastructure. Clay, sand casting process: the clay and the amount of water as the main binder sand, direct co-type and in the wet state after pouring into sand. Wet casting a long history, a wider application. Depends on the strength of wet clay and sand mixed with water by a certain percentage from the clay slurry. Once a good mix of sand that has a certain strength, after Chung made real sand, you can meet the requirements of combined type and pouring. Therefore, the amount of clay in the sand and water is a very important factor in the process. The advantages are: ① clay rich resources and cheap. ② used wet sand clay sand after proper treatment, most can be recycled for reuse. ③ mold manufacturing cycle is short, high efficiency. ④ good mix of sand can be used for a long time. ⑤ real sand Chung still suffer after a small amount of deformation without damage, and lower on the draft core are very favorable. Disadvantages are: ① sand when you want a thick clay slurry is coated on the sand surface, knead the role requires use of high-power blender equipment, it is impossible to get good quality sand. ② Due to mix well after sand has a very high strength, not easy when modeling the flow of sand, it is difficult Chung real, laborious hand-shape when they need certain skills, when the device modeling of complex machines and huge. ③ mold stiffness is not high, poor dimensional accuracy of the casting. ④ easy to produce red sand casting, sand, porosity and other defects. Coated sand casting process: shell shape refers to the resin sand and preheat to metal contact 150-350 ℃ to form consistent with the metal mold cavity contour modeling method of the thickness of a hard shell 6-12.5mm . Advantages: High ① casting dimensional accuracy, a small allowance. ② smooth casting surface. ③ pourable thin-walled castings. ④ casting scrap rate. ⑤ improve productivity Disadvantages: ① with a metal mold, more energy, resin adding volume, high cost. ② sand process is relatively complex. ③ high cost, suitable for casting large. Resin sand casting process: self-hardening furan resin sand named from English Furan No-Bake process, it is expressed as furan resin binder, and add a catalyst mixed sand, no bake hardening or pass gas, namely sand molding method can make the self-curing at room temperature. Is often referred to as "chilled resin sand" or even "resin sand." Advantages are: ① casting surface smooth, clear edges, high dimensional accuracy. ② high modeling efficiency, increased productivity and space utilization, shorten the production cycle. ③ resin sand (core) high strength (including high-temperature strength), forming a good, fat volume than other organic mold is low, good thermal stability, good ventilation, can greatly reduce the viscosity of the casting sand, gravel, trachoma, porosity, shrinkage, cracks and other casting defects, thereby reducing scrap rates, can produce complex parts, key pieces of clay sand is difficult to make. Disadvantages are: ① the original sand are higher, such as particle size, particle shape, Si02 content, powder content, alkali metal salts and clay content and others have more stringent requirements. ② temperature and humidity affect the curing speed and strength after curing. ③ Compared with inorganic binder mold, resin sand gas evolution is high, such as inappropriate measures, easy to produce pores class defects. ④ hardening mechanism is due to dehydration condensation type, so the hardening reaction need some time alone to look like a low turnover rate, multi-Mo Yang adapted to high-volume production of castings. ⑤ Compared with clay, sand, costs are still high. ⑥ of ductile iron castings such as stainless steel or a low C, sulfur or carburizing surface due to seepage may adversely ball or by carbon. Lost foam casting process: EPC (also known as solid casting) is the combination of size and shape similar to the foam casting model bonded into the cluster model, fire-resistant paint and brush after drying, buried in the dry sand vibration modeling, pouring under negative pressure, so that the model gasification, liquid metal occupy model position, forming a new casting after casting solidification cooling. The advantages are: high ① casting accuracy, surface finish and reduce cleanup. ② design flexibility. ③ no tradition of casting sand core. ④ reduce the weight of rough castings, and small machining allowance. ⑤ can achieve large-scale, high-volume production. Disadvantages are: ① Among the craft ductile castings, easy to produce gray folder phenomenon. ② casting material and its suitability for the good order of the difference is roughly: gray cast iron - non-ferrous alloys - ordinary carbon steel - ductile iron - low carbon steel and alloy steel; through the necessary preparations so as not to cause craft experiments, commissioning cycle is too long. ③ casting size mainly consider use of appropriate equipment (eg, tap sets, sand box). The more complex the more ④ casting structure to reflect the lost foam casting process and economic superiority, for a narrow channel and mezzanine of the cavity structure, the former LFC process requires the use of pre-experiment, in order to put into production.