3, can not afford to shell layer, good thermal stability, good thermal conductivity, good liquidity, casting surface; a vibration sand, high-strength, low gas, low expansion; 2, lax, good casting surface finish smooth; 4, high strength, high temperature, low inflation, good mold release, anti-sticky sand is good; 5, the shell is not uniform shelling, fast curing; quality coated sand core in addition to the geometry of the sand core , outside the dimensional accuracy, surface quality and shell thickness, but also by observing the color of the sand core to cure the core sand test case. The normal situation is that the appearance of the sand core should be uniformly brown, pale yellow coated sand regeneration center offer, when burnt brown and even black exterior rendering coated sand regeneration, insufficient hardening look yellow, the center is white iron type Sand casting the main process parameters: the type of wall thickness of 25mm iron coated sand production line regeneration, covered sand thickness 5-8mm (for small bore ductile iron crankshaft); iron-type quality in general is about five times the quality 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, for ordinary coated sand coated sand, particularly suitable for mass production; the latter suitable for single-mass (iron type size up to several meters in length) of the crankshaft and other coated sand recycling plant, 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 coated sand used mainly for high-quality selection of natural quartz sand raw sand thermoplastic phenolic resin, methenamine and enhancer as raw materials. Depending on the technology needs of users, the curing speed, stripping, mobility, collapsibility, the casting surface finish, storage and other aspects of appropriate adjustments to match. Is one of the cars, tractors, hydraulic parts and other materials the best shape. Coated sand regeneration lines, coated sand regeneration, provided by Qingdao Heng Heng Machinery Co., Ltd. Qingdao. Qingdao Heng Machinery Co., Ltd. (www.thjidian.com) strong, credible, Shandong Qingdao Cleaning equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Qingdao Heng and you hand into the brilliant, for a better future!