Quality coated sand core in addition to the geometry, dimensional accuracy, surface quality and shell thickness smaller sand core resin sand regeneration line, but also by observing the color of the sand core to test the core sand curing conditions. Normal circumstances is resin sand regeneration, sand core should look uniform brown, center yellow, when burnt brown and even black exterior rendering, lack of hardening yellow appearance, the main craft center is white cast iron with Sand 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 (cast coated sand quality and quantity consumed ratio) of 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, etc., 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, centrifugal casting thermal maximum density of the process is in the rough shape of the metal type ( iron type) in a traditional centrifugal casting process, mainly for the production of Tube rotator casting, first in the iron mold cavity surface coated layer of paint in order to facilitate hanging modulo. In recent years, has developed a suitable alternative coating production centrifugal casting coated sand. Because of its exhaust is less effective, it requires a thin wall (about 3mm), and often using double sand, and casting the contact surface with sand (70/140 mesh), the outer layer of coarse sand (50/100 mesh) stick Performance-caking agent has a great impact on the quality of coated sand, people have been working on how to improve the performance of phenolic resin, and find alternatives to phenolic resin. Abroad has developed a special resin with different properties, such as high strength, low gas resin, the resin is easy to collapsing, there are reports of the use of modified polyester resin sand resin regeneration principle, but did not get the full extension, so far is still widely used modified phenolic resin. China in recent years in research and development dedicated phenolic resin coated sand faster, has developed a different use for the production of modified phenolic resin regeneration principle resin sand, resin sand regeneration, provided by Qingdao Qingdao Heng Heng Machinery Co., Ltd. . 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!