What is special casting?

The process of melting the metal into a liquid that meets certain requirements and pouring it into the casting mold. After cooling, solidification and cleaning, the casting (parts or blanks) with predetermined shape, size and performance is obtained.  Basic technology of modern machinery manufacturing industry.  The cost of the blank produced by casting is low. For the parts with complex shape, especially complex inner cavity, it can show its economy.  At the same time, it has wider adaptability and better comprehensive mechanical properties.  But casting production required materials (such as metal, wood, fuel, molding materials, etc.) and equipment (such as metallurgical furnace, sand mixing machine, molding machine, core-making machine, sand falling machine, shot blasting machine, etc.) more, and will produce dust, harmful gas and noise and pollution of the environment.

Casting is a kind of metal thermal processing technology that man has mastered earlier, with a history of about 6000 years.  In 3200 BC, copper frog castings appeared in Mesopotamia.  From the 13th century BC to the 10th century BC, China had entered the heyday of bronze casting, and the technology had reached a fairly high level, such as the 875kg Simuwu square ding of the Shang Dynasty, the Yi Zun plate of Marquis Zeng of the Warring States Period, and the transparent mirror of the Western Han Dynasty, etc., were representative products of ancient casting.  The early casting was greatly influenced by pottery, and most of the castings were tools or utensils in agricultural production, religion and life, with strong artistic colors.  In 513 BC, China produced the world's first recorded cast iron -- the casting tripod of the State of Jin (about 270 kg).  Around the 8th century, Europe began to produce cast iron.  After the industrial Revolution in the 18th century, castings entered a new period of service for large industry.  Into the 20th century, the rapid development of casting, has developed nodular cast iron, malleable cast iron, ultra-low carbon stainless steel and aluminum copper, aluminum silicon, aluminum magnesium alloy, titanium, nickel base alloy and other casting metal materials, and develop a new process for gray cast iron breeding treatment.  After 50's, there appeared wet sand high pressure modeling, chemical hardening sand modeling and core making, negative pressure modeling and other special casting, shot blasting cleaning and other new technologies.

There are many kinds of casting, according to the modeling method is customarily divided into: (1) ordinary sand casting, including wet sand, dry sand and chemical hardening sand type 3.  (2) special casting, press molding materials and can be divided into natural mineral sand as the main special casting molding materials (e.g., Investment Casting, mold casting, shell mold casting foundry, negative pressure casting, mold casting, ceramic mold casting, etc.) and metal as the main mold material of special casting (such as metal mold casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc.).  Casting process usually includes: (1) casting (liquid metal into solid castings container) preparation, casting according to the material can be divided into sand, metal, ceramic, mud, graphite, etc., according to the number of use can be divided into one-time type, half type and type, casting preparation is the main factor affecting the quality of casting;  (2) the melting and casting of casting metal, casting metal (casting alloy) are mainly cast iron, cast steel and cast non-ferrous alloy;  Casting treatment and inspection, casting treatment including the removal of core and casting surface foreign bodies, removal of pouring riser, shovel grinding burr and seam and other protrusions and heat treatment, plastic, rust treatment and rough processing. More info, pls visit: www.sczyltd.com

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