How to ensure the quality of foundry sand
Release time:
2020-12-24
In the process of casting at high temperature, the sand size is easily changed due to the thermal expansion of the sand, which affects the accuracy of the casting size and the appearance and performance of the casting. At the same time, the thermal expansion coefficient of the molding sand is too large, which will cause casting defects such as sand inclusion, scarring, and rat tail. All kinds of factors make foundry enterprises more careful in choosing molding sand, not only to consider the thermal expansion coefficient of molding sand, but also to take into account the cost of molding sand.
The basic requirements of foundry sand are mainly to have high purity and cleanliness; high refractoriness and thermal stability; suitable particle shape and particle composition; not easy to be wetted by liquid metal; and cheap and easy to obtain. In addition, the particle shape and particle composition of casting sand have an impact on the fluidity, compactness, permeability, strength and permeability of liquid metal, and are important indicators of the quality of casting sand.
In the early days, most of the natural silica sand containing clay, that is, mountain sand and river sand, they have good plasticity, but now the emergence of foundry sand, can be said to be a better substitute, its characteristics and quality is relatively good, in the future trend has a good prospect.
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