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With the advance of science and technology and the foundry industry's vigorous development, different casting methods have different casting preparation content. The most widely used sand casting, for example, casting preparation, including modeling material preparation and modeling, core-making two major operations. Sand casting used to modeling, core-making a variety of raw materials, such as casting sand, sand binder and other auxiliary materials, as well as formulated by them into the sand, core sand, paint, etc. collectively referred to as modeling materials, modeling materials to prepare for the mission is in accordance with the requirements of the casting, the nature of the metal, selecting the appropriate raw sand, binder and auxiliary materials, and then according to a certain proportion of the mixture into the sand with a certain function of the sand and core sand. Commonly used sand mixing equipment are wheel mixer, counter-current sand mixer and continuous sand mixer. The latter is designed for mixing chemical self-hardening sand, continuous mixing, sand mixing speed.
     
Molding, core making is based on the requirements of the casting process, in determining a good molding method, ready to molding materials on the basis of. The precision of the casting and the economic effect of the whole production process depends mainly on this process. In many modern foundries, molding, core-making are mechanized or automated. Commonly used sand molding core making equipment are high, medium and low pressure molding machine, air punch molding machine, no box shot pressure molding machine, cold core box core making machine and hot core box core making machine, coated sand core making machine and so on.
     
Castings from the pouring of cooled casting after taking out, with a gate, risers, metal burrs, phi seams, sand casting castings are still adhering to the sand, and therefore it is necessary to pass through the finishing process. The equipment for this kind of operation has grinding machine, shot blasting machine, pouring riser cutting machine and so on. Sand casting sand finishing is a process of poor labor conditions, so in the selection of modeling methods, should try to take into account the sand finishing to create convenient conditions. Some castings due to special requirements, but also by the casting of post-treatment, such as heat treatment, shaping, rust treatment, roughing and so on.
      
Casting process can be divided into three basic parts, namely, casting metal preparation, casting preparation and casting processing. Casting metal refers to casting production for pouring castings of metal materials, it is a metal element as the primary component, and participate in other metal or non-metallic elements and alloys, customarily referred to as casting alloys, the primary cast iron, cast steel and casting non-ferrous alloys.
       
Castings from the pouring of cool casting after taking out, there are sprues, risers and metal burrs phi seams, sand casting castings are still adhering to the sand, and therefore it is necessary to go through the finishing process. The equipment for this operation has a shot blasting machine, gate riser cutting machine. Sand casting sand finishing is a process of poor labor conditions, so in the selection of modeling methods, should try to take into account the sand finishing to create convenient conditions. Some castings due to special requirements, but also by the casting of post-treatment, such as heat treatment, shaping, rust treatment, roughing and so on.
        
Casting is a more economical way of forming blanks, on the shape of complex parts can show its economy. Such as automobile engine block and cylinder head, ship propellers and exquisite works of art. Some difficult to cut parts, such as steam turbine nickel-based alloy parts do not have to casting methods can not be formed.
     
In addition, casting parts size and weight of the customary range is very wide, the metal type is almost unrestricted; parts in general mechanical function, but also has a wear-resistant, corrosion-resistant, shock-absorbing and other inductive function, is other metal forming methods such as forging, rolling, welding, punching and so on can not do. Therefore, in the machine manufacturing industry with the casting method of production of billet parts, in terms of quantity and tonnage so far is still the most.
     
Casting production often have to use a variety of metals, coke, wood, plastics, gas and liquid fuels, modeling materials. Required equipment are smelting metal with a variety of furnaces, sand mixing with a variety of sand mixing machine, there is molding core with a variety of molding machine, core making machine, there are finishing castings with the sand machine, shot blasting machine and so on. There are also for special casting machines and equipment and many transportation and material handling equipment.
             
Casting production has different characteristics with other processes, the first is customary wide, need more information and equipment, pollution of the environment. Casting production will occur dust, harmful gases and noise pollution of the environment, more serious than other machinery manufacturing process, the need to take measures to control.
         
Casting products to develop the trend is to require castings have better general function, higher precision, less margin and more bright surface. In addition, the requirements of energy saving and society's call for the restoration of the natural environment is also increasingly high. In order to accustom to these requirements, new casting alloys will be developed, smelting new technology and new equipment will be presented accordingly.
     
Casting production mechanization and automation in the increasing degree of the same time, will be more to the flexible