In the coated sand production areas should be strengthened following two aspects: (1) hair coated sand pollution, mainly from the following aspects: ① to reduce the amount of resin and curing temperature; ② coated sand to improve the overall performance, especially ③ strengthen pollution research phenolic resin substitutes; high temperature performance;. (2) increase the regenerative capacity of coated sand coated sand coated sand production equipment package recycling has been a topic of concern for the majority of experts, the current coated sand regeneration equipment is expensive and regeneration efficiency is not high, productivity is 5 tons / hour The thermal regeneration equipment prices in the 1200-1600 ten thousand yuan coated sand suppliers, recycled coated sand will cost 65-90 yuan / ton, so the cost can not be cast for domestic enterprises in addition to the quality of coated sand core the geometry of the sand core, dimensional accuracy, surface quality and thickness of the shell outside the coated sand Which is stronger, but also by observing the color of the sand core to test the core sand curing conditions. The normal situation is that the appearance of the sand core should be uniformly brown, center yellow, when burnt brown and even black exterior rendering, insufficient hardening look yellow, white center with Sand cast iron main process parameters: Iron type wall thickness 25mm, covered sand thickness 5-8mm (for small bore ductile iron crankshaft); iron-type quality in general is about five times the mass of castings; iron ore ratio (casting quality and the consumption ratio of the amount of coated sand) 6-7. Iron-type cladding sand molding methods (ie sand overlying obtained) has shot molding and compression molding sand two, the former is currently used more coated sand, sand covered for ordinary coated sand, particularly suitable for mass production ; the latter is suitable for single-mass (iron type size up to several meters in length) of the crankshaft, covering a variety of fluidized sand Sand. The former sand shot selection pressures related to the thickness of the coated sand, sand shot when the pressure is 0.2-0.6MPa, coated sand thickness is 4-5mm, its densest core production entity theory, almost coated sand production all types, particularly solid core precision castings. When using the wet coated sand, direct access to hot-box core making equipment and tooling without the original equipment and tooling to make any changes. When using dry sand coated sand coated manufacturers, due to their mobility, and the need to exhaust the way the core box, the nozzle and the core box seals for special treatment. Angle of repose principle can be used (coated sand repose angle of about 30o), coated sand into the sand shot resolved when the exhaust chamber and shoot do not shoot automatically when the sand coated sand whereabouts and other issues. Currently, the use of dry heat coated sand box core technology manufacturers are more coated sand suppliers, Qingdao Heng (certified), coated sand by Heng Machinery Co., Ltd. Qingdao. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) is Qingdao, cleaning, cleaning equipment leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Qingdao Heng led the staff warmly welcome all inquiries negotiations to create a better future Qingdao Heng.