1, the wax pattern deformation, after wax models out of the mould, in addition to the size change narrow, sometimes because of the technique is not correct when taken out of man-made deformation;Because the wax models flexure deformation is common in the cool, so just from the molding wax models still carefully placed, usually with large plane datum flat, also may be a wax material too soft, pressed to factors such as unreasonable design.
2, wax mold filling, the main reason is that the temperature of the wax material is too low, injection speed, molding temperature is low, causing wax material in the process of flow cooling fast, performance part or on the edge of Angle and wax models of thin-wall parts, filling place appear rounded edges and corners, this kind of situation and metal casting misrun extremely similar.