Liquid metal forming process more precise and difficult to control, making the casting quality is not stable enough. Compared with the forging of the same material, because the liquid forming tissue loose, coarse grains, internal easy to produce shrinkage, shrinkage, porosity and other defects. Its low mechanical properties. In addition, labor-intensive, poor conditions. Have excellent mechanical and physical properties of the pier bollard equipment, it can have a variety of strength, hardness, toughness overall performance, but also combines one or more special performance bollard equipment products, such as wear-resistant , high temperature and low temperature resistance, corrosion resistance and so on. Casting weight and size range are very wide, weighs only a few grams of the lightest bollard equipment, heaviest up to 400 tons, the thinnest wall thickness of only 0.5 mm, the thickness can be more than 1 meter in length by a few millimeters to ten meters, can meet the requirements of different industrial sectors. Casting defects: streaks. Features: presenting the casting surface is consistent with the direction of flow of the liquid metal bollard equipment manufacturers, hand drawn partial sinking feeling smooth texture. This defect-free development, with a polishing method can place. Reason: 1, the two share a cavity filled metal stream is not synchronized and traces. 2, mold temperature is low, such as zinc alloy die temperature below 150 ℃, aluminum mold temperature below 180 ℃, are easy to produce such defects. 3, the filling speed is too high. 4, the amount of excess paint. Remedy: 1, adjust the gate cross-sectional area or location. 2, adjust the mold temperature, increasing overflow tank. 3. Adjust the speed to change the metal filling the cavity filled with fluid flow pattern. 4, the use of a thin, uniform coating. Bollard equipment manufacturers, Chen Hua machinery (certified), bollard equipment 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.