Foundry casting refers to the use of clay bonded sand for casting, molding materials production is the process method has a long history, is also the most widely application scope.
With a long history dating back to thousands of years ago;
Its application scope, can be said that there is no place not all over the world.
Next, explain foundry casting the granularity of the requirements for you.
1, 140 mesh sieve sand should be 10 -
Keep more of fine sand, can reduce surface adhering sand casting
And will add to the amount of binding bridge between sand, so as to reduce the brittleness of sand, avoid sand washing defects.
In addition, the increase temperature strength of moulding sand, dry strength and humidifying layer strength is good after moisture migration.
2, 200 mesh, 270 mesh sieve and chassis on the sum of fine sand should be less as far as possible.
Such a fine effect on improving surface quality of castings is not big, but will make composite sand moisture content is higher, and can lower the permeability of sand.
The sum of fine shall generally be less than 4%.
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