China in 513 BC, cast out of the world's oldest written records found in cast iron - casting Jin Ding, weighing about 270 kg. Europe around the eighth century AD began producing cast iron. Cast member appears to expand the scope of application of the casting. For example, in 15 to the 17th century, Germany, France and other countries have laid a lot of cast-iron pipes for drinking water to residents. After the Industrial Revolution of the 18th century, and so on steam engines, textile machines and railway industry rise foundry casting, foundry casting entered a new era of large-scale industrial services, casting technology began to have a big development. In the 20th century, the development of fast-speed casting, which is an important factor in the progress of technology products, requiring better casting a variety of mechanical and physical properties, while still having good mechanical processing performance; the other reason is the mechanical industry itself and other Industries such as the development of chemical, instrumentation, etc., to the casting industry to create a favorable material conditions. Such as the development of testing methods to ensure the improvement of the quality of castings and stability and to the development of casting theory provided the conditions; electron microscope invented to help people deep into the microscopic world metal probe the mysteries of metallic crystals, theory of metal solidification lost wax casting, casting production guidance. 2 special casting casting mold, press molding materials can be divided into natural mineral sand as the main form of special casting material (such as investment casting, mud casting, shell casting, vacuum casting, solid casting, ceramic casting etc.) and metal as the main material of special casting mold (such as metal casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc.) categories. 2.1 Metal casting method using a melting point higher raw metal production molds. Which is subdivided into gravity casting, low pressure casting and high pressure casting method. Subject to the melting point of the mold may be cast metal has also been limited. 2.2 This method of lost wax casting method for membrane casting and solid casting. First copy the desired wax casting objects, and then immersed containing ceramic (or sol [2]) in the pool and be dry, so to wax replica made of a ceramic membrane covered, repeating the steps until the outer membrane enough to support the casting process (about 1/4 inch to 1/8 inch), and then melt the wax mold, and pulled out of the mold. Thereafter the mold needs to be repeated high temperature, hardness can be used to enhance the rear casting. This method has good accuracy, but also can be used as a refractory metal (e.g. titanium) casting. However, due to the high prices of ceramic, and repeated heating and complex production needs, so the cost is quite expensive. [3] casting, Chen Hua machinery, sand casting provided by the China Machinery Equipment Co., Ltd. Qingdao Chen. Qingdao Chen Hua Machinery Co., Ltd. (www.qdchenhua.com) quality of service and products, continue to receive the recognition and trust of new and old customers and the industry. Our company is a certified member of the whole alliance network operators, business alliance customer service icon on the page, you can talk directly with our customer service staff, to our future cooperation happy!