The phenomenon of cold insulation and casting of steel castings

For some large steel castings, no matter in what way the surface of the product forming, more or less have some quality defects, the more obvious is the cold shut and misrun phenomenon, from the general quality of workpiece. In order to further improve the quality of steel castings, the relevant processes need to be optimized to eliminate the generation of various defects.
Cold insulation of steel castings
The so-called cold separation phenomenon, is because the surface tension of large castings causes, resulting in two different directions to the same position of the steel can not be well fused together, leading to the occurrence of bad phenomena. Can be found through observation, a dent junction in general cold shut, rounded and smooth edge.
Two, cast steel casting defects
This is because the liquid steel is not fully filled with large castings, making large castings shape is not complete, the problem often appears in the far from the gate location.
Three, the causes of defects and Solutions
From the above definition, the fundamental causes of the two defects are liquidity solution is not good, but because of the low pouring temperature, pouring system section size or improper proportion, the static head is not enough, casting speed, middle flow and running fire and mould good air permeability and other factors.
In order to prevent the occurrence of similar problems, one can strengthen the control of the melt melting quality, improve its liquidity; and can choose proper pouring temperature, casting speed to accelerate the uniform flow; on the other hand also need to design the gating system, flowing in a mould distance should not be too long, while paying attention to mold exhaust, when necessary exhaust riser design.