Liquid metal filling morphology of different density model combinations in Lost Foam Casting
The model shown in Fig. 1 is made of two models with the same size and different density bonded by […]
The model shown in Fig. 1 is made of two models with the same size and different density bonded by […]
The phenomenon that the mold wall displaces after the molten metal is poured into the lost foam casting mold is
Many observations and experiments have shown that the liquid metal is filled radially forward in the filling process of lost
The filling process of lost foam casting has a decisive influence on the quality of castings. Due to the existence
Fig. 1 to Fig. 3 are isochronous graphs of liquid metal filling pattern of lost foam casting under different pouring
Compared with the traditional casting method, lost foam casting is very simple to box and remove sand. Due to the
Pouring has a great influence on the quality of castings. The more complex the pattern is, the more important it
The outer circle diameter is 150mm, the inner circle diameter is 100mm, and the ring thickness is 20mm. The model
After putting the mold coated with lost foam casting paint into the sand box containing bottom sand, fill the sand
The external geometric dimension is 200mmx100mm, the internal geometric dimension is 150mmx50mm, and the thickness of the model is 20mm.
The test results are shown in the table: Pouring position Total mold filling time (s) Average filling speed (cm/s) Side
Lost foam casting is a special gravity casting. Because of the existence of foam solid shape in the cavity, it
Paint Total mold filling time (s) Average filling speed (cm/s) Low permeability coating 1.18 17.00 Medium permeability coating 1.14 17.54
The test results are shown in the table. Sprue height (mm) Total mold filling time (s) Average filling speed (cm/s)
The solidification process of castings includes phase change, heat and mass transfer, and the heat transfer phenomenon is in the
The test results are shown in the table. Pattern density (g/I) Total mold filling time (s) Average filling speed (cm/s)
The changing trend of the influence of pouring temperature on the average mold filling speed of molten metal in lost
In the filling process of liquid metal in gray iron lost foam casting, there is an air gap between the
Since the early 1980s, fata company of Italy, in cooperation with sapolest company of France, has designed and manufactured several
The test results are shown in the table: Pouring temperature (℃) Total mold filling time (s) Average filling speed (cm/s)
In terms of lost foam casting for mass production, it can be divided into two categories according to the current
Lost foam casting coating is different from traditional sand mold coating. The surface of lost foam castings is the inner
In Britain, the earliest application of lost foam casting is the British cast steel research and Trade Association, whose method
Japan has used this method to produce large castings since the 1960s, such as Kobe iron Institute, which is still
The coating raw material lost foam casting coating is composed of refractory, binder, carrier, suspending agent and special additives such
The United States was the first country to apply the lost foam casting method and was the first to carry
The theoretical research of lost foam casting started late. In the 1950s and 1960s, some research was carried out on
Lost foam casting has outstanding advantages, which has attracted more and more attention of foundry workers in recent years. Lost
The selection of negative pressure degree is particularly critical in vacuum negative pressure lost foam casting. A large number of
Lost foam casting molding is completed by model disappearance, decomposition products escaping from the mold, and liquid metal replacement model.