Casting defects: abrasions Other names: pull, pull marks, sticky mold scars. Features: along the parting direction, due to metal adhesion, mold manufacturing slope is too small to cause injury marks casting surface, serious face became strained. Reason: 1, core, type casting wall slope is too small or appear down the slope. 2, core, pressure-type wall scars. 3, alloy adhesion mold. 4, the top of the casting skewed, or core axis deflection. 5, the wall-type surface roughness. 6, paint spraying less often. 7, aluminum iron content of less than 0.6%. Remedy: 1. Fix the mold, to ensure manufacturing slope. 2, lighting indentation. 3, the rational design of gating system, avoid metal core flow hedge, wall type, due to lower fill rate. 4, the amendment mold structure. 5, polishing surface. 6, the amount of thin, uniform coating, spray coating can not be missed. 7, due to increase the iron content to 0.6 to 0.8%. Casting a variety of classification methods: by its use of different metal materials into steel, cast iron, bronze pieces, cast aluminum, cast magnesium parts, pieces of cast zinc, cast titanium parts. And each class can be divided according to their chemical composition or casting microstructure further divided into different categories. Such as cast iron can be divided into gray iron castings, ductile iron castings, vermicular cast iron, malleable iron, alloy cast iron pieces; according to different methods for molding, casting can be divided into ordinary sand casting, metal casting, die casting centrifugal casting, continuous casting parts, castings, ceramic castings, castings ESR, bi-metal castings. Among the most common application of sand casting, casting about 80% of the total production. The aluminum, magnesium, zinc and other nonferrous castings, mostly casting. . Casting very versatile, has been applied to the metal and machinery and electronics industries throughout 150t bollard, and its use is a growing trend. Specific use, construction, hardware, equipment 1000kn bollard, engineering machinery and other large machinery, machine tools, shipbuilding, aerospace, automotive, motorcycle, electronics, computers, electrical bollards, lighting and other industries, many of which are full of ordinary people day contact, but do not understand metal objects. Chen Hua Machinery Co., Ltd. Qingdao Since its inception, the construction of a large-scale chemical production equipment 1500kn bollard, alkali industry companies Casting a 3.2 m diameter special corrosion-resistant cast iron tower rings and 3.6 meters in diameter sieve special alloys ( is the city's first); manufacture of baking soda carbonation tower complete sets of equipment; the manufacture of large diameter pipe chemicals; for State Power Generation Co., Ltd. Fuzhou Jiangyin plant construction project to install a large trash rack. To produce ten tons of single port buffer grab straps, and access to national patents, products are sold to Taiwan and other places; galvanized towing tank has been used for port construction; building materials enterprises supporting a new brick mold; carving textile carding model and so on. Container Terminal with a wheel guard and towing tank Hom is the company's traditional products in Qingdao Qianwan Container Terminal QQCT three projects, Qingdao Harbor two renovation project, Qingdao Harbor small basin project, Rizhao Port revetment works Rizhao Westport Container Terminal and Grain Terminal works were designed using my bucket wheel guard and towing tank, were evaluated to obtain high-quality project. 1000kn bollard, Chen Hua machinery (certified), bollard provided by China Machinery Equipment Co., Ltd. Qingdao Chen. Qingdao Hua Chen Machinery Co., Ltd. (www.qdchenhua.com) is Qingdao, a leader in CNC machine tools over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Chen Hua Machinery leadership in the staff warmly welcome all inquiries negotiations to create a better mechanical Chen Hua future.