A layer of sand that is hard to remove on the surface of the heat-resistant steel castings is known as sticky sand. In terms of adhering sand, will not only affect the heat resistant steel customize the appearance of the castings, next, to a large extent, also is actually increases the custom clean up of the casting itself, the cutting process of workload, as a result, it to a large extent, actually is also will affect the life of the machine itself.
Prevent heat resistant steel adhering sand phenomenon in a custom castings, we actually is also must pay attention to the pulverized coal in the sand directly joined in, and directly in the mold surface is besmear brushs paint adhering sand, etc. Next, it will disappear custom casting sand, in fact, will be divided into mechanical sand or chemical sand.
In terms of the essence of the mechanical adhering sand, in terms of its essence, metal for sand filling pores between infiltration, in this case, in terms of its form, also is actually because of the metal itself infiltration pressure, to a large extent, actually is also will be more than the sand of the gap between gas backpressure and directly by the metal liquid surface tension is caused by the additional pressure, when the liquid metal directly permeate sand gap caused by, such as at that time, which is outside the foam mold.
, of course, we also is to actually pay attention to is custom heat-resistant steel castings is hang up if you want to apply a layer of dense surface coating, to a large extent, actually is also will be directly ACTS as the prevent metal liquid directly into the role of the inside, which, to a large extent, actually is also will effectively prevent the castings produced mechanical adhering sand phenomenon.
Moreover, we also is to actually pay attention to the discovery of heat resistant steel custom castings produced chemical adhering sand phenomenon, also is actually because of the type of material itself is not high refractoriness, and its own as a result of melting temperature is low, when we after pouring into the high temperature liquid metal, actually is also will be more likely to be molten metal, at this time to add a layer of high refractoriness, can prevent the custom chemical adhering sand castings.http://www.dmgcastings.com/