Effective method to solve sand sticking of gray iron castings
Release time：
2023-02-21
After the completion of casting, gray iron castings sometimes have local sand sticking, which is because the local coating in the mold cavity falls off or cracks during casting, and liquid metal will penetrate between the sand particles, forming different degrees of sand sticking defects. After the completion of casting, gray iron castings sometimes have local sand sticking, which is because the local coating in the mold cavity falls off or cracks during casting, and liquid metal will penetrate between the sand particles, forming different degrees of sand sticking defects.
After the completion of casting, gray iron castings sometimes have local sand sticking, which is because the local coating in the mold cavity falls off or cracks during casting, and liquid metal will penetrate between the sand particles, forming different degrees of sand sticking defects.
The main causes of sand sticking defects are:; The coating is not evenly brushed, the coating permeability is too high, the local dry sand compactness is too low, that is, the sand is not filled to the proper density during molding, the coating on the parts bearing high temperature is too thin, the negative pressure is too large, and the casting temperature is too high to exceed the bearing range of refractory coating.
Methods and measures to solve sand sticking of gray iron castings:
1、 To improve the thickness and fire resistance of the coating, it is recommended to select the fire-resistant coating with better quality as far as possible.
2、 The casting temperature shall be controlled reasonably, and the temperature detection rod shall be used to timely detect whether the molten iron temperature reaches the castable temperature.
3、 The principle of molten metal casting at high temperature and low temperature is adopted to reduce the penetration of molten metal into the cavity.
4、 When molding around the mold, try to select fine molding sand to place molten iron penetrating the coating into the sand particles, and use molding sand with slightly larger sand particles to improve the permeability, and ensure that the molding sand is filled in place and compacted to a reasonable density.
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