: I; o & ampn * I； q！ a)` & amp； First of all, L- W needs to make it clear that importing CAD graphics into sketches must conform to the operation rules of the next "feature". The steps are as follows: [4 o6 Z9 k2 U3 X% p6 x ~6 L v Z 1: Save the graphics in CAD format as DXF 2000 format; 3 l6 ~！ ` 5 x) Y4 Z) n2: Open the CAD drawing in CATIA (displayed in the engineering drawing in CATIA when opened); ; q+x & amp； U% m9 l- N* h4 R3: Select, copy (Ctrl+C) and paste the CAD graphics shown in the drawing into the sketch (Ctrl+V)4: Exit the sketch and enter the feature operation. Note: The "fillet" in the CAD drawing may make mistakes when exiting the sketch, so it needs to be trimmed in the sketch! The above method can improve the efficiency of quickly generating three-dimensional drawings from the original CAD sheet metal (complex single plane wall) two-dimensional drawings. The teacher of Zhengzhou mold design training will tell you that it may be that the graphics are too complicated and the calculation is interrupted. In this case, it is suggested that it can be closed in sections, and finally it can be calculated into a total entity through Boolean operation, or the position near the middle can be materialized first, and then chamfered, so that the subsequent position does not need to be materialized. In addition, it may be that the accuracy is not enough to close it. For example, the line of a certain part is not continuous enough, which leads to the poor continuity of the surface made of this line. In the subsequent surface operation, cracks are generated due to cutting and repairing. A surface with insufficient quality cannot be closed into a solid. In this case, we can consider repairing the surface instead of simply relaxing the tolerance. Sometimes the surface can be operated by filling, repairing, trimming and connecting, and finally it can be closed, but at its edge, cracks appear due to different curvature and tension. These gaps can be analyzed by analyzing the internal connection checker analysis. When modeling surfaces, we should actually pay the most attention to the basic elements. High-quality lines will produce high-quality surfaces, and high-quality surfaces can be combined to form a volume within the allowable modeling tolerance.