When the white mold is dried, the placement is unreasonable. If the code layer is too high, it will cause deformation. The drying time of the white mold is suitable, which causes the linear shrinkage of the white mold to be insufficient excessive . The size of the blank after pouring does meet the requirements of the drawing.

The solution is:

(1) The white mold uses a drying shelf when drying placing, which neither wastes the drying room space nor deforms the white mold;

(2) The drying of the white mold has two functions, one is to dry the moisture inside the white mold, the other is to make the residual foaming agent inside the white mold escape. The white mold will cause linear size shrinkage during the drying process. The mold factory has left the white mold shrinkage margin in the design, but the linear shrinkage of the white mold is different for different products, the same drying temperature drying time. So different products have different drying processes. In the production process, both the two functions of drying the white mold must be taken care of, the size of the casting blank