公开(公告)号：US20240359225A1

公开(公告)日：2024-10-31

申请号：US18769033

申请日：2024-07-10

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Zhubin HE ,  Haihui ZHU ,  Jian NING ,  Yi XU ,  Linwei LENG

IPC: B21C23/14

CPC classification number: B21C23/14

Abstract: The present invention belongs to the technical field of metal forming manufacturing and discloses an integral forming method for a large-size thin-walled ring shell. The integral ring shell obtained by the forming method of the present invention has only one circumferential weld seam and one radial weld seam. If the two weld seams are located in an excisable process segment region, the target part without weld seams can be obtained after the process segment is cut off. The forming method of the present invention adopts a local thermal expansion forming method, plastic deformation occurs only in mold-constrained high temperature regions in a single local forming process, and a part with each region meeting the requirements can be obtained after several local thermal expansion forming processes. The forming method of the present invention can obtain two open cross-sectional ring shell components or multiple segmented ring shell components at one time.

公开(公告)号：US20230066289A1

公开(公告)日：2023-03-02

申请号：US17864176

申请日：2022-07-13

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Zhubin HE ,  Jiangkai LIANG ,  Wei DU ,  Xinyu HU ,  Yi XU

IPC: B23K26/342 ,  B21B37/24 ,  B23K26/082 ,  B21B47/00 ,  B23K26/70 ,  B33Y10/00 ,  B33Y50/02 ,  B33Y40/20

Abstract: Laser additive manufacturing and a method for preparing thin-walled preforms by laser metal deposition and follow-up rolling. This can solve the problems that when the existing laser metal deposition technology prepares the thin-walled preforms, the limit width size of a molten pool at high power affects the forming wall thickness of the preforms so that it is difficult to prepare preforms with wall thickness less than 2 mm, and the problems of poor surface quality and low accuracy of preforms due to convex and concave peaks caused by the interlayer overlapping, but also can solve the problems that a laser beam with a preset trajectory cannot act on the end surfaces of the preforms due to preform deformation caused by residual stress in a printing process so that the preforms cannot be continuously formed.

公开(公告)号：US20210197261A1

公开(公告)日：2021-07-01

申请号：US16863199

申请日：2020-04-30

Applicant: Dalian University of Technology

Inventor： Zhubin He ,  Yi XU ,  Jiangkai Liang ,  Wei Du ,  Peng Lin

IPC: B22F3/105 ,  B21D26/049 ,  B21D26/041

Abstract: The present invention discloses a method for manufacturing a thin-walled metal component by three-dimensional (3D) printing and hot gas bulging. The present invention uses 3D printing to obtain a complex thin-walled preform, which reduces a deformation during subsequent hot gas bulging. The present invention avoids local bulging thinning and cracking, undercuts at the parting during die closing, and wrinkles due to the uneven distribution of cross-sectional materials, etc. The present invention obtains a high accuracy in the form and dimension through hot gas bulging. After a desired shape is obtained by hot gas bulging, a die is closed to keep the component under high temperature and high pressure for a period of time, so that a grain and a phase of the material are transformed to form a desired microstructure.