Causes of iron trapping in castings in precision casting
Published:
2018-11-29
There are many reasons for iron clamping in the casting in precision casting, which can be analyzed from welding, shell making and casting, the following are the reasons for iron clamping from shell making.
There are many reasons for iron clamping in the casting in precision casting, which can be analyzed from welding, shell making and casting, the following are the reasons for iron clamping from shell making.
1, improper allocation of raw materials: chemical reaction in the surface layer slurry produces a lot of gas, it will be attached to the wax parts with the paint. In addition, the slurry is too thick will also make its liquidity decline, some grooves of the wax parts at the corners can not be covered, leaving a pore, after casting will have iron beans appear.
2, the correct choice of sand grain mesh: the casting structure is complex, there are deep and narrow gaps or holes, due to the sand scattering too coarse, so that these places are plugged, making the dipping slurry is not enough, thus leading to the type shell is not dense, part of the local shell is thin, the strength is reduced.
Corresponding measures: Before dipping the slurry, use the air gun to blow away the upper layer of floating sand, then you can pass the silica sol first, and then dip the slurry, which can strengthen the fluidity of the slurry and prevent the blockage situation. After the floating sand, the operator can use a fine rod to pass a round hole, the gap at the heap of sand, also conducive to the subsequent dipping slurry on the sand. In addition, for the deep hole products, the sand can be filled into the hole with slurry after three layers, so as to prevent iron leakage from the inner wall of the deep hole.
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