The developing course of casting

Casting is a metal humans master earlier hot working process, about 6000 years of history. China between 1700 ~ 1700 b.c. Has entered the heyday of bronze casting, craft has reached a quite high level. The shang dynasty of China's 875 kg SiMuWu square, yi statue of plate of the warring states period, the western han dynasty through the lens, are the representative of the ancient casting products.
Early castings are mostly agricultural production, religion, life, etc, tools or equipment, color art. Then the casting process is with the parallel development of pottery making craft, much affected by the pottery. China in 513 BC, cast out of the world can be found in the earliest written records of the cast iron state of jin ding, weighing about 270 kilograms. In Europe before and after the eighth century began production of iron castings. The emergence of cast iron parts, expand the application range of castings. In the 15 ~ 17 century, for example, Germany, France and other countries has been equipped with a lot of to residents cast iron pipes for drinking water. Of the 18th century industrial revolution, the steam engine, the loom and railway industries, casting into the great industrial services in the new period, the development of casting technology has great.
In the 20th century, the development of casting speed, one of the important factors is the product technology advances, castings of various mechanical and physical performance is better, still has a good mechanical processing performance at the same time; Another reason is that mechanical industry itself and the development of other industries such as chemical industry, instrument, created favorable material conditions for the foundry industry. As the development of detection methods, ensures the improvement of casting quality and stability, and gives the development of the theory of casting conditions; The invention of the electron microscope, etc, to help people into the metal microscopic world, explore the mysteries of metal crystallization, the research of metal solidification theory, guide the casting production. Developed a large number of superior performance in this period, a variety of new casting metal materials, such as nodular cast iron, the welding of malleable cast iron, ultra-low carbon stainless steel, aluminum, copper, aluminum, silicon, aluminum and magnesium alloys, titanium, nickel base alloy, etc., and the new process of grey cast iron inoculation treatment, the adaptability of castings is more extensive. After the '50 s, the wet sand modelling, high-pressure chemical hardening sand molding and core making, negative pressure molding, and other special casting, the new technology such as the shotblast cleaning, the casting possesses high precision of the shape, size and good surface finish, foundry has been greatly improved the working conditions and environmental health.
Significant progress in the foundry industry, since the 20th century of gray cast iron inoculation and chemical hardening sand molding this two new technology is of special significance. The two inventions, broke through the for thousands of years of traditional methods, has opened up a new field to the casting process, to improve the competition ability of casting has a significant influence.