The application provides a lightweight integrated multi-cavity structure part additive manufacturing method, first, a forming direction is selected, and a self-forming structure is designed on a process model design for a partition structure between cavities, so that integrated multi-cavity forming is realized. Further, the requirements of
product integration and lightweight are considered, and an integrated pipeline based on
topology optimization, a self-forming rib and a rib plate or a
variable density point array structure for supporting an internal overhang or a surface that cannot be self-formed are designed. In order to consider the cleaning and detection of excess materials, a process hole structure that is interconnected and connected to the outside is designed at the lowest point in the forming direction of each cavity, so that the lightweight integrated multi-cavity structure
additive process model design is completed. After additive manufacturing is completed according to the selected forming direction, the residual
powder, liquid and other excess materials are completely removed by means of the designed process hole, and finally, the lightweight integrated multi-cavity structure additive manufacturing is realized.