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Problems that should be paid attention to when Coboer-machine castings are poured

2011-8-25 Keboer Group 3315

Machine tool castings are cast in lost foam/resin sand. When machine tool castings are cast, the following points should be noted:

1. At the initial stage of pouring, especially when the molten metal is in contact with the foam, the static pressure of the molten metal is less than that of polystyrene when the sprue is not filled or just started pouring. When the gas pressure of the product is too high, it is easy to produce a bonfire phenomenon, causing the molten metal to splash. In order to avoid this phenomenon, the method of first fine flow and slow pouring can be adopted at the beginning of pouring. After the pouring system is filled with the molten metal, the pouring speed can be increased as fast as possible, but the pouring cup is filled with metal instead of Spillover is the criterion. At the end of the casting, when the molten metal reaches the top of the pattern or the root of the riser, it should be slightly packed to keep the metal rising smoothly and not to cause the molten metal to rush out of the riser.

2. Use the bottom note package whenever possible. The bottom note metal liquid has small heat loss, large indenter, and high pouring speed. The slag floats on the upper surface of the molten metal, and the molten steel is relatively clean. Due to equipment conditions, some requirements are not high or general small and medium machine tool castings can also be subcontracted.

3. The pouring process cannot be interrupted. When the lost foam casting is poured, the molten metal must be continuously injected until the mold is completely filled. Otherwise, it is easy to cause a cold partition defect in the entire plane of the casting at the standstill.

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