Some castings due to special requirements, but also by casting processing, such as heat treatment, plastic, rust treatment, rough. The weight of iron is more economical rough forming method for complex shaped parts more demonstrated its economy. Such as a car engine cylinder block and cylinder head, ship propellers and exquisite works of art. Somewhat difficult to cut parts, such as gas turbine nickel-based alloy parts not with heavy rail can not be forming. In addition, the range of part size and weight with heavy rail is very wide, the type of metal is almost unlimited; parts in general mechanical properties at the same time, with wear, corrosion-resistant, shock-absorbing performance and other metal forming methods such as forging, rolling, welding, punching, etc. can not do. Used with the method of production of the heavy rail rough parts in the machine manufacturing industry in the number and tonnage is still by far the largest. With the production of heavy rail, regular use of the material has a variety of metals, coke, wood, plastics, gases and liquid fuels, modeling materials. That is required for smelting metal with a variety of stoves, the sand used in various Mixer, modeling core making, molding machine, core making machine, clean up the castings shakeout machine, shot blasting machine and so on. As well as for the heavy iron machinery and equipment of the special distribution and transport and material handling equipment. With heavy iron production has different characteristics and other processes, mainly wide adaptability, needed materials and equipment, pollute the environment. Production will generate dust, harmful gases and noise pollution of the environment with heavy rail, to be more serious than other mechanical manufacturing processes need to take measures to control. With heavy iron product development trend is to require casting a better overall performance, higher accuracy, less margin and smooth surface. In addition, the energy requirement and the community to restore the voice of the natural environment. In order to meet these requirements, the new weight alloy will be developed, and the smelting of new technology and new equipment will be a corresponding. Increasing at the same time, the degree of mechanization and automation of the production with heavy rail will be more flexible production, to expand the adaptability of different lot sizes and multi-variety production. New technologies to save energy and raw materials will be given priority in development, to produce less polluting new technology and new equipment will first be taken seriously. Quality control techniques in the process of detection and nondestructive testing, stress determination by, there will be a new development. With heavy rail workers in electronic technology and testing methods continue to progress under the condition of the metal crystalline solidification and sand compaction and theory more in-depth exploration of an effective way to improve casting performance and internal quality. Robotics and computer applications, where the weight of iron production and management areas will become increasingly widespread.