Casting weight and size range are very wide, weighs only a few grams of the lightest and heaviest up to 400 tons, the thinnest wall thickness of only 0.5 mm, wrought iron fence, the thickness can be more than 1 m, wrought iron, the length may be a few millimeters to ten meters, can meet the requirements of different industrial sectors. Casting quality has a great impact on the performance of mechanical products. For example, wear resistance and dimensional stability of the casting machine, a direct impact on the accuracy of the machine to maintain life; all kinds of pump impeller, housing and hydraulic cavity size, accuracy and surface roughness profile, directly affect the pump and efficiency of the hydraulic system, the development of energy consumption and cavitation etc; intensity combustion engine block, cylinder head, cylinder, piston rings, exhaust pipes and other castings and resistance to spalling resistance, direct impact on the working life of the engine. Classification mainly sand casting foundry and specialty casting two categories. An ordinary sand casting, the use of sand as the mold material, also known as sand casting, foundry, including wet sand, dry sand and chemical hardening sand three categories, but not all can be used for sand casting. Iron Gate advantage is low cost, because the mold used sand can be reused; drawback is time consuming Iron accessories mold making, casting itself can not be reused must be destroyed in order to obtain the finished product after. 1.1 Sand (core) casting methods: wet sand type, self-hardening resin sand, water glass sand, dry-type and dry type, solid casting, vacuum molding. 1.2 sand core manufacturing method: is selected based on the sand core size, shape, production volume and the specific production conditions. In production, a whole can be divided into handmade and machine-made core core. Two special casting, press molding material 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, casting ceramics, 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. Iron window _ Chen Hua Machinery (certified) _ Iron provided by China Machinery Co., Ltd. Qingdao Chen. Qingdao Hua Chen Machinery Co., Ltd. (www.qdchenhua.com) is Qingdao, a leader in CNC machine tools over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Chen Hua Machinery leadership in the staff warmly welcome all inquiries negotiations to create a better mechanical Chen Hua future.