In 1956, the American H.F.Shroyer invented the method of real casting, and won the US patent in 1958. It was called the Cavitiless Casting Mold and Method of making same, and it was the first to use foam processing and sand and casting metal statues and handicrafts parts containing binder.
In 1962, professor a wittmoser of German University developed and applied it to the field of industrial manufacturing under the name of “full mold process”. In the early stage, the CO2 water glass sand molding used in lost foam casting is due to the immature research and production process of foam pattern and environmental pollution. This requires improvement of foam materials and molding process. German h nnellen invented the dry sand lost foam casting method in the early 1960s. In 1962, American M. C. Flemings used dry sand molding without binder to produce castings, which brought the casting into the era of dry sand lost foam casting. In 1964, T.R. Smith and others in the United States studied the method of producing castings with pure dry sand, and announced to the world in the form of patent that casting can be realized without binder.
The full mold casting method using traditional green sand and self hardening molding sand was successfully practiced in 1967, but the dry sand lost foam casting method is still in the experimental improvement stage, because it is easy to collapse in the filling process. In order to solve this problem, in 1967, a wittmoser adopted the magnetic field as the binder and iron shot instead of dry sand as the molding material “magnetic mold process”, which was announced at the GIFA conference in 1968. In 1968, Germany’s e kryzanowsky. Vacuumized the full mold casting and succeeded in pouring. In 1969, Japan invented the vacuum sealing (sand box) molding method, which uses the film to seal the sand box and use the vacuum to form a pressure difference inside and outside the sand box to compact the molding sand, referred to as V method, Based on this method, the full vacuum sealed mold proess (FV method for short) is developed. At the present stage, the lost foam casting process uses this kind of method to fix the molding sand. It is considered as the composite casting process of full mold casting and V-method molding, which absorbs the advantages of both. The lost foam casting method did not develop rapidly at that time. Until the early 1980s, this kind of vacuum negative pressure and dry sand molding casting process was generally recognized and applied. In 1982, the appearance of the first lost foam casting production line in the United States marked that the production automation of lost foam casting application has become a reality.