Lost wax casting process to produce castings products we all go through inspection, because production after writing only after inspection we can ensure the quality of the product, so the task of inspection of the casting is we must be carefully prepared.Lost wax casting casting surface should be smooth, 1000 mm within the scope of the flatness (or deformation) is not more than 3 m m (special exception);Do not allow the existence of depth and diameter greater than 3 mm hole defect, if such defect repair is bigger than 150 x150mm and lose value as a waste, can repair must be re-examined after welding repair and polished bright and clean;Installation dimensions for drawing requirement tolerances must be strictly implemented according to the drawings, not note tolerances free size of the partial difference is not greater than the size of the smoothness of the lowest level of casting standard regulations of the state;Can't exist on the surface of the product serious crack defects, if the processing surface minor crack length is not more than 20 mm, after check with technical department allowed the use of hot welding repair method to repair.