公开(公告)号：US10576524B1

公开(公告)日：2020-03-03

申请号：US16537382

申请日：2019-08-09

Applicant: Dalian University of Technology ,  Harbin Institute of Technology

Inventor： Shijian Yuan ,  Zhubin He ,  Xiaobo Fan ,  Yanli Lin ,  Guofeng Wang ,  Chang Qi

IPC: B21D37/16 ,  B21D37/02 ,  B21D22/02 ,  B21D37/08 ,  C21D1/673

Abstract: The present invention provides a die capable of achieving rapid forming and quenching therein. The die includes an upper die, a blank holder and a lower die, where the upper die is composed of an internal solid die core and a thin-walled skin. Grooves in communication with each other are disposed between the internal solid die core and the thin-walled skin. In a forming stage, the grooves are not filled or filled with a heat insulating material such as a gas; and in a quenching stage, a low-temperature medium is introduced into the grooves. The die can be used to achieve rapid forming and quenching of metal materials of different types and thicknesses.

公开(公告)号：US11260444B2

公开(公告)日：2022-03-01

申请号：US16743621

申请日：2020-01-15

Applicant: Harbin Institute of Technology

Inventor： Yongchao Xu ,  Shijian Yuan

IPC: B21D22/22 ,  B21D22/06 ,  B21D22/24 ,  B21D24/08 ,  B21D37/10 ,  B21D43/00 ,  B21D11/22

Abstract: The present invention discloses a forming device for a large thin-walled part with a curved surface, which includes a punch, a blank holder, a die, a lower die plate, a first annular sleeve and second annular sleeves. The first annular sleeve is connected with first driving oil cylinders. An inner diameter of the die is greater than an outer diameter of the punch. The first annular sleeve is arranged in a gap between the punch and the die. The second annular sleeve is arranged at the bottom of the punch. The first annular sleeve is arranged outside the second annular sleeve. The second annular sleeve is connected with second driving oil cylinders. The first driving oil cylinders and the second driving oil cylinders are connected with a hydraulic system.

公开(公告)号：US11027863B2

公开(公告)日：2021-06-08

申请号：US16715093

申请日：2019-12-16

Applicant: Harbin Institute of Technology

Inventor： Shijian Yuan ,  Xiaolei Cui

IPC: B21D26/02 ,  B65B3/36 ,  B29D22/00 ,  B65D88/04

Abstract: The present invention discloses a method and system for controlling axial length of an ellipsoidal shell based on liquid volume loading. The method includes: determining the volume calculation models of an unformed prefabricated shell and a formed ellipsoidal shell; determining a calculation model of a volume difference between the unformed prefabricated shell and the formed ellipsoidal shell; determining a structure size of the unformed prefabricated shell according to a target axial length of the formed ellipsoidal shell; obtaining the volume difference between the formed ellipsoidal shell and the unformed prefabricated shell, and recording the volume difference as a target volume; injecting liquid into the unformed prefabricated shell with target volume to obtain the formed ellipsoidal shell. The forming process in the present invention is simple and easy to implement without considering differences in materials and wall thicknesses and can control and adjust the axial length dimension accuracy of a shell.

公开(公告)号：US10710139B2

公开(公告)日：2020-07-14

申请号：US16541583

申请日：2019-08-15

Applicant: HARBIN INSTITUTE OF TECHNOLOGY

Inventor： Shijian Yuan ,  Zhubin He ,  Xiaobo Fan ,  Mingqu Ding ,  Guofeng Han

IPC: B21D26/027 ,  B21D26/025 ,  B21D26/055 ,  B21D37/16 ,  B21D53/04 ,  B21D26/029

Abstract: A method for quick forming of a metal sheet. In an embodiment, the method includes the following steps: placing a metal sheet blank to be formed on a forming mold; introducing high-pressure gases with equal pressures simultaneously into upper and lower enclosed cavities respectively formed by the metal sheet blank and the sealing mold, and the metal sheet blank and the forming mold; heating the metal sheet blank to a preset forming temperature condition; quickly releasing the high-pressure gas from the cavity formed by the metal sheet blank and the forming mold, such that the metal sheet blank bulges; and discharging the gas from the cavity formed by the metal sheet blank and the sealing mold, and opening the mold to obtain a formed metal sheet part.

公开(公告)号：US10688552B2

公开(公告)日：2020-06-23

申请号：US16095938

申请日：2018-05-08

Applicant: HARBIN INSTITUTE OF TECHNOLOGY

Inventor： Gang Liu ,  Shijian Yuan ,  Dongjun Wang

IPC: B21D26/041 ,  B21K21/04 ,  C22F1/02 ,  C22F1/18

Abstract: Provided herein is a method of hot gas forming and heat treatment for a Ti2AlNb-based alloy hollow thin-walled component, which pertains to the technical field of plastic forming manufacture of thin-walled components made from difficult-to-deformation materials, more particularly, a forming method of Ti2AlNb-based alloy hollow thin-walled components is involved. The purpose of this invention is to solve the existing problems that Ti2AlNb-based alloy hollow thin-walled components are difficult to form, process steps are complex, and the shape and dimension precision is in contradiction with the control of the microstructure and properties. The method comprises the following steps: (1) hot gas forming to obtain hot gas formed tube components, and (2) controllable-cooling heat treatment to obtain Ti2AlNb-based alloy hollow thin-walled components. The advantages of this invention are as following: improving production efficiency, high dimensional accuracy, reducing energy consumption, achieving the integration of shape and performance control, and excellent mechanical properties. The invention also relates to Ti2AlNb-based alloy hollow thin-walled components manufactured by a hot gas forming and heat treatment method.