公开(公告)号：US11911961B1

公开(公告)日：2024-02-27

申请号：US18242529

申请日：2023-09-06

申请人： NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

发明人： Zhongde Shan ,  Congze Fan ,  Jinghua Zheng ,  Wenzhe Song ,  Yiwei Chen ,  Kai Liu

IPC分类号： B29C64/218 ,  B29C64/236 ,  B29C64/295 ,  B29L31/30 ,  B33Y30/00 ,  B33Y80/00

CPC分类号： B29C64/218 ,  B29C64/236 ,  B29C64/295 ,  B29L2031/3097 ,  B33Y30/00 ,  B33Y80/00

摘要： An additive manufacturing device for an aerospace truss includes a raw material input unit, a longitudinal beam forming unit, a longitudinal beam traction unit, a cross beam forming unit and a truss support unit. The raw material input unit stores pre-impregnated wires and pre-impregnated tapes, and a motor drives rollers to convey the pre-impregnated wires and the pre-impregnated tapes forward; the longitudinal beam forming unit is composed of three sets of forming molds, and the pre-impregnated tapes form V-shaped longitudinal beams through heating molds; a stepper motor used in the longitudinal beam traction unit drives three sets of roller traction devices through steering gears to pull formed longitudinal beams; the cross beam forming unit is composed of a motion module and a printing module, and a truss cross beam is printed through a 3D printing method of molten deposition.

公开(公告)号：US11969943B1

公开(公告)日：2024-04-30

申请号：US18536236

申请日：2023-12-12

申请人： NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

发明人： Yiwei Chen ,  Jinghua Zheng ,  Zhongde Shan ,  Wenzhe Song ,  Congze Fan ,  Hao Zhang

IPC分类号： B29C64/295 ,  B29C64/232 ,  B29C64/245 ,  B33Y30/00 ,  B33Y70/10

CPC分类号： B29C64/295 ,  B29C64/232 ,  B29C64/245 ,  B33Y30/00 ,  B33Y70/10 ,  B29K2905/02

摘要： A hot bed deformation tolerance structure for a large-sized continuous fiber high-temperature 3D printer is provided. Size changes caused by thermal expansion of a hot bed are compensated through motion coordination of a secured hot bed support assembly and a motion device, especially for an aluminum alloy material. A Z-direction motion structure of this structure is fixedly mounted with a frame and works at room temperature. A compensation motion module is fixedly mounted with a Z axis and incompletely secured with the hot bed support assembly, and works at room temperature with the Z axis. The hot bed support assembly is incompletely secured and partially in a high-temperature chamber, with a maximum working temperature of 300° C. The hot bed support assembly retains motion redundancy in a direction of thermal expansion deformation, tolerates thermal deformation through a linear motion module, and compensates for metal deformation through horizontal motion coordination.

公开(公告)号：US12011882B1

公开(公告)日：2024-06-18

申请号：US18520581

申请日：2023-11-28

申请人： NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

发明人： Congze Fan ,  Wenzhe Song ,  Zhongde Shan ,  Yiwei Chen ,  Jinghua Zheng ,  Yaxing Song

IPC分类号： G06T15/00 ,  B29C64/393 ,  B33Y50/02 ,  G06F30/10 ,  G06F113/10

CPC分类号： B29C64/393 ,  B33Y50/02 ,  G06F30/10 ,  G06F2113/10

摘要： A path planning method based on dynamic contour offset discretization and for spatial curved-surface printing is provided. Firstly, transversal equal slicing is carried out on a target model, and single/double contours are labeled; secondly, central slicing is carried out on the model, curvature contours are discretized, feature values of contour offsets of slice layers are calculated on the basis of a surface contour curvature of the model, and dynamic offset filling for inner contours of horizontal slices is realized; then longitudinal equal slicing is carried out on the slices, and spatial discrete points of the target model are obtained; and finally, virtual double contours are constructed for the single contours, and labeling processing for the discrete points is carried out, so that a discretized three-dimensional spatial equidistant lattice of the target model is obtained.

公开(公告)号：US11926098B1

公开(公告)日：2024-03-12

申请号：US18243651

申请日：2023-09-07

申请人： NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

发明人： Zhongde Shan ,  Congze Fan ,  Wenzhe Song ,  Yiwei Chen ,  Jinghua Zheng ,  Linlin Luo

IPC分类号： B29C64/321 ,  B29C64/118 ,  B33Y30/00

CPC分类号： B29C64/321 ,  B29C64/118 ,  B33Y30/00

摘要： A wire feeding mechanism suitable for fused deposition Additive Manufacturing (AM) of a flexible wire is provided, which includes a support housing. A melting nozzle is arranged at the lower end of the support housing, a hook is connected to the inner wall of the top end of the support housing, a connecting rod is connected to the inner wall of one side of the support housing, a wire drawing mechanism is connected to one end of the connecting rod, the wire drawing mechanism is located at the lower end of the hook, a limiting mechanism and a wire guide mechanism are connected to the inner wall of one side of the support housing, the limiting mechanism is located at the lower end of the wire drawing mechanism, the wire guide mechanism is located at the lower end of the limiting mechanism.