Due to the poor fluidity of semi-liquid and semi-solid forming processes, thin-walled castings are best produced by the squeeze casting process. The system is designed to be compatible with the squeeze casting process. Therefore, in the production, the squeeze casting process or the semi-solid forming process can be selected according to the different types of products. R.Hitchings, Metal Cleaner, published a paper on a new low-cost automatic metal-liquid filtration method for automated casting production6. In the case of aluminum alloy casting using a cold chamber die casting machine, since the repetitive automatic casting production process, the operation of the filter sheet/mesh in the casting mold often cannot be realized. The automatic filter suitable for pressure casting and metal casting production developed through experiments has solved the above problems. The machine is mainly composed of a liquid pouring tank and a draft tube and a filter automatic replacement device located in the middle of the machine.
The filter material is woven into a roll of refractory filter mesh to purify the metal liquid. The filter mesh can be selected according to the type of liquid metal to be filtered, such as: glass fiber, silica, alumina, graphite and other materials. In operation, the scum and inclusions left by the filter attached to the screen used by the filter will be quickly replaced by the new screen surface. Prototype testing of the automatic filter was carried out in a foundry that used the metal mold casting method to produce aluminum molds for casting molds. The alloy used was aluminum alloy A380. When profile analysis of the filter residue was performed, a large number of Inclusions, which are obtained by X-rays, consist of aluminum, magnesium, silicon and zinc oxides. In order to prove that the automatic filter improves the quality of the castings, the castings and filtrates produced by the automatic filtration of the aluminum liquid filtered by the automatic filter were selected and compared with those of the castings produced by the aluminum liquid without filtration. The internal inclusions and defects were significantly better than those of the unfiltered ones. Less castings. At the same time, because the size of the working area of ​​the filter screen is controlled, the use cost of the filter screen is significantly reduced.
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