Casting Speed Of Fused Cast Series Block
2015-10-10
Casting speed directly determines the casting time, and every fused cast block has its own best casting time. Unreasonable casting time can cause many defects in the casting.
Low casting speed
If the casting speed of fused cast series block is too slow, defects such as corner loose, knot, sand inclusion and Insufficient casting will be produced. Low casting speed leads to thin liquid flows, when the thin liquid flow is casted into the mold of fused cast series block, solidified to a small ball and move to the side corner which will result in loose of edge angle. If the first poured liquid flow has solidified into thin shells which will inward contraction, then poured liquid flows will get into the gaps between the thin shell and the mold which form scar on the surface of fused cast series block. Meanwhile, if the liquid flows are too thin, before reaching the side corner the liquid flow will be solidify which will lead to Insufficient casting. In addition, low casting speed will also lead to long time casting which means that mold baking time will be increased, that the mold cover is easy peeling off into the molten liquid and cause sand inclusion.
High casting speed
If the casting speed of fused cast series block is too fast, the liquid flows become wide which bring a great impact on the casting mold of fused cast series block, then part of casting mold is broken through or melted which can make this part of mold risen up. In addition, when the wide liquid flow is casted into mold, some air is may brought into casting mold and rising to the top cover of the mold rapidly. Meanwhile, liquid touched top cover has already formed thin shell, so when air rises to the top cover that so-called shell is formed. What is more, it is easy to form air bubbles inside the mold when air is brought in mold. Except for the air, wide liquid flows caused by high casting speed may also brings the raw material which is in furnace mouth into molten liquid of fused cast series block.
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