3D printing method for complex curved hollow structure, and printer

A 3D printing method for the complex curved hollow structure, comprising the following steps:

• a bottom die to which the complex curved hollow structure is attached is manufactured, and the bottom die is provided with a molding surface C with the shape consistent with that of the complex curved surface to be molded;
• then the bottom die serves as a support, and the complex curved hollow structure is molded on the molding surface C of the bottom die;
• and molding of the bottom die and molding of the complex curved hollow structure are completed under the same world coordinate system, that is, after the bottom die is molded, a to-be-molded part is printed on the molding surface C of the bottom die in situ, and the bottom die does not need to be taken down from an objective table and then transplanted into a printing system of the to-be-molded part;
• the molding of the bottom die and the molding of the complex curved hollow structure are located under the same world coordinate system and are achieved by sharing the objective table by two sets of printing systems, after the bottom die is molded on the objective table, the bottom die and a molding part of the complex curved hollow structure are subjected to tool setting, and then additive molding is achieved on the molding surface C of the bottom die;
• when the complex curved hollow structure is molded in an extrusion mode, the molding part is an extrusion nozzle;
• if SLA molding is adopted, the molding part is an optical part for curing materials;
• the solid model of the bottom die is manufactured by using a DLP molding method, during DLP molding, the bottom die is arranged at the lower part, the objective table is arranged at the upper part, and the bottom die is molded on the objective table in a lifting manner;
• after the bottom die is molded, the objective table rotates around a middle shaft by 180 degrees, so that the bottom die is arranged at the upper part, and the objective table is arranged at the lower part;
• the extrusion nozzle and the bottom die are subjected to tool setting, a coordinate system of the solid model of the bottom die in an extrusion method is identical to that of the solid model of the bottom die in the DLP molding method, and the extrusion nozzle is aligned with a starting point position of molding in the extrusion method.