Our country is in the 1950s and the beginning of the sixties the investment casting used in industrial production. Later this advanced casting process has been tremendous development, have been widely used in the aerospace, automotive, machine tools, ships, internal combustion engines, gas turbines, telecommunications equipment, weapons, medical equipment and tools and other manufacturing industries, as well as for process Manufacturing and crafts of. The so-called investment casting process, it simply is to use fusible material (such as wax or plastic) fusible model (referred to as the melting mold or model), which is coated in several layers of a special fire-resistant paint cast iron rain covers prices, After drying and hardening after the formation of a whole shell ductile iron water wells, and then steam or hot water in the melt away from the shell model, and then placed in the shell sand box, filled with dry sand around it in shape, and finally cast type into the roaster in the high-temperature roasting (such as the use of high-strength shell when rain covers specification, may not have the shape and baking the shell directly after stripping) after rain covers, mold or shell after roasting, in which cast obtained by casting molten metal. For the ship docked, loading and unloading cargo and tourists up and down the hydraulic structures. Is a major component of the port. Plane dock layout points: Along the Coast, jetty, pier and so on. Pier wharf is divided into the shore with isolated Pier Approach linked or continuous pier linking bridging system; jetty was divided into narrow jetty (jetty is a unitary structure) and wide jetty (on both sides of the pier structure, which with Fill constitute dock floor). By sub-section form, there are vertical, slope-style, semi-erect and semi-sloping. According to the structure in the form of points, there is gravity, sheet pile type, high pile, slope style, pier and floating dock type style and so on. By zoning, there is general groceries pier, wharf (fishing pier, oil terminals, coal docks, ore docks, container terminals, etc.), Ferry Terminal, in the dock for harbor work boats and work boats used for ship repair and shipbuilding work and dedicated dock ship repair, outfitting quay rain ductile iron manhole covers | rain covers | Chen Hua Chen machinery provided by the China Machinery Equipment Co., Ltd. Qingdao. Qingdao Hua Chen Machinery Co., Ltd. (www.qdchenhua.com) strong, credible, in Qingdao, Shandong CNC machine tool industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chen Hua machinery and you hand into the brilliant, for a better future!