In order to eliminate or reduce the influence of air gap, the mold cavity should be designed with a certain inverted taper according to the different shrinkag

In order to eliminate or reduce the influence of air gap, the mold cavity should be designed with a certain inverted taper according to the different shrinkage characteristics of steel grade and the degree of thermal deformation of mold copper plate. Pour mould taper should follow the following principles: the choice of solidification shrinkage properties of steel grade, mould cavity within the shape should be larger limit is suitable for the actual shape of solidification shell mould, make the whole mold gas gap thickness dropped to a lower level, improve the effect of heat transfer in the mould, in order to guarantee the uniformity of the thickness of the solidified shell in the mould and mould under the shell thickness. After the use of copper tube, if the maintenance span can not restore the mold taper to the standard range required by the steel mill, then the life of copper tube of mold is expired.