When casting from the mold after demoulding, due to the different parts removed, unequal heat shrinkable lead to unequal casting size changes, the casting size.1, the reason: as the product of lost wax casting wall thickness is the same, there is a sharp change of thin wall thickness wall, casting existence of stress concentration, when to take out the casting, different parts of the shrinkage of proportion is not shrinking;Casting under the thermal state, small deformation, can also lead to casting on placing method is not correct will cause deformation.2, countermeasures: product structure improvement, such as the smooth transition, the appropriate rounded corners, wall thickness uniformity;Set appropriate reinforcement, reduce stress concentration, increase casting rigid;Set at different positions of the mold temperature control, cooling channel;Change the way lost wax casting mold release agent used, adjust the concentration, adjust the spraying method;Take out after casting water, reduce the lost wax casting deformation;Put out when casting light with light, reduce the deformation force.