The process used in metal casting. According to the modeling method, modeling materials and casting methods classification, sand casting, permanent casting, pressure casting, metal casting and investment casting five basic casting methods.
Sand type commonly known as "Frost", the specially prepared sand, installed around the model tamping, remove the model, leaving the cavity in the sand (mold). Metal Casting The molten metal is poured into the mold, the metal in the mold after the condensation, the molding sand (mold) destroyed, they get metal castings.
The permanent casting mold is made of graphite, cement or metal and can be used hundreds of times to several thousand times. Mold can also be made of clay and sand, available dozens of times, called semi-permanent type. The casting method is the same as sand casting.
Pressure casting referred to as "die-casting", is a permanent (metal) casting development. Pressure casting is the strength of the molten metal into the mold, Metal Casting and under pressure in the crystallization and solidification, resulting in tissue density, good performance and high dimensional accuracy of the casting.
Metal casting: the molten metal poured into the rotating mold, the metal liquid in the centrifugal force under the crystallization and solidification, Metal Casting you can get dense and excellent performance of the castings.
Investment Casting: An ancient casting method that has a long history in China. Due to the model with wax-based materials, also known as "lost wax casting." Ancient used for casting works of art. In the twentieth century, for dental technology. After the Second World War, due to the development of gas turbines, investment casting has been promoted to become a metal forming technology in the industry.
Casting is widely used in the manufacturing process because it has many advantages. Since the molten metal can flow into any one of the small places of the mold, Metal Casting it is possible to use casting in both complex and external shapes. Whether non-ferrous or non-ferrous metals can be done with casting. In addition, the tools required for casting are very simple and inexpensive. So the trial production and small batch production, casting is an ideal production method. Only in the casting process to calculate the exact amount of material required. So in the design process to reduce the waste material can be achieved. Castings generally begin to cool evenly from all directions, Metal Casting so we want metal to have no directional properties. Some metals can only be used in the casting process rather than other processes such as forging, because in the metal forming process do not want other metal components involved. Casting can be used in any size and weight of the product manufacturing process, or even 200 tons of products.
However, the accuracy and surface finish of the products in the ordinary sand casting process are in many cases less than the requirements of the product. Taking into account these circumstances, die casting has occurred, in addition to sand casting is labor-intensive, it should be in the mechanical molding and casting mechanization has improved. For some materials, it is often difficult to eliminate the problems that occur during the casting process.