In 1958, H.F.shroyer of the United States invented patent technology for making metal castings by using foamed plastic pattern and obtained a patent (Patent No. USP2830343). The original appearance was made of polystyrene (EPS) plate and clay sand, which was used to produce art castings. After using this method, the foam pattern does not need to be played out. Instead, when the liquid metal is poured into the liquid metal, the polystyrene molecules are cracked at high temperature, leaving space filled with molten metal and solidified to form the casting. In 1961, German companies Grunzweig and harrtmann purchased this patented technology for development, and it was applied in industry in 1962. The technology of producing castings with binder free dry sand was patented by H. nellen of Germany and T.R. Smith of the United States in 1964.
In 1967, a. wittemoser of Germany used iron pellets that could be magnetized to replace silica sand as In 1967, a. wittemoser of Germany used iron pellets that could be magnetized to replace silica sand as modeling material and magnetic field as “binder”. This is called “magnetic mold casting”. In 1971, Nagano of Japan invented the V method (vacuum casting method). lost foam casting also uses vacuum pumping to fix molding sand in many places. Before 1980, the use of binder free dry sand process must be approved by the American “full mold process, Inc.” after that, the patent was invalid. Lost foam casting technology has developed rapidly all over the world.
In 1990, General Motors established a new foundry with an annual output of 55000 tons in Saturn, with three fully automatic lost foam casting production lines.
In 1991, Fiat of Italy built the largest lost foam casting production workshop in Europe in Turin, with an annual output of 15000 tons.
In 1993, BMW built a lost foam production line with an annual output of 200000 aluminum alloy cylinder heads of various specifications.
In 2001, SmCo of general motors of the United States built the most advanced and largest lost foam casting in the world.