公开(公告)号：US11618085B2

公开(公告)日：2023-04-04

申请号：US16800688

申请日：2020-02-25

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Baicheng Zhang ,  Lin Zhang ,  Shubin Ren ,  Mingli Qin ,  Xuanhui Qu

IPC: B33Y30/00 ,  B22F12/58 ,  B22F12/67 ,  B22F10/28 ,  B22F12/49 ,  B22F10/14

Abstract: A selective laser melting technology-based apparatus for preparing a gradient material, comprising a laser scanning array lens, and a powder storer, a powder mixer, a powder scraping plate, and a working platform that are provided in sequence from top to bottom; the powder storer is provided with two or more partitions; a bottom portion of the powder storer is provided with an outlet; the powder mixer is provided under the powder storer and is a horizontally provided rotational mixer; the powder scraping plate is disposed under the powder mixer; the working platform is provided under the powder scraping plate; the laser scanning array lens is provided on the working platform. The present invention further relates to a method for preparing a gradient material, comprising powder storing, powder scraping, powder mixing, powder laying, and printing. The method can guarantee the two-phase powder ratio in each layer of powder not change.

公开(公告)号：US11697154B2

公开(公告)日：2023-07-11

申请号：US16926868

申请日：2020-07-13

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Baicheng Zhang

IPC: B22F3/24 ,  C25F3/16 ,  C25F7/00 ,  B33Y40/20

CPC classification number: B22F3/24 ,  B33Y40/20 ,  C25F3/16 ,  C25F7/00 ,  B22F2003/241

Abstract: A polishing method for an inner wall of a hollow metal part, including: firstly, placing a coaxial cathode in an inner hole of a metal part when a metal part model is designed, and printing the metal part model and the coaxial cathode together; then, sealing two ends of an inner hole cavity of the metal part by using a light curing part, fixing the coaxial cathode, filling the cavity with a polishing solution, and performing polishing treatment by using an electrochemical polishing method; and finally, reversing an electrode to break the coaxial cathode and take out the broken coaxial cathode to obtain a polished metal part. The polishing of a complex-shaped inner hole of a 3D-printed metal part is realized, the defect that an inner hole of a 3D-printed metal part with a complex-shaped hollow part cannot be polished by using a traditional machining method is overcome, the problem that an inner wall of a metal part polished by using an electrochemical method is non-uniform is solved, the surface quality of the inner hole of the 3D-printed metal part with the complex-shaped hollow part is improved, and the application prospect and postprocessing technology of the 3D-printed metal part are expanded.