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1.发明授权公开(公告)号：US11932915B2
公开(公告)日：2024-03-19
申请号：US17179481
申请日：2021-02-19
Applicant: Dalian University of Technology
Inventor： Shijian Yuan , Xiaobo Fan
CPC classification number: C21D1/74 , C21D8/0421 , C22C21/08 , C22C21/16 , C22C21/18
Abstract: The present invention provides a method for forming an aluminum alloy thin-walled curved part by ultra-low temperature gradient drawing. This method includes: placing the aluminum alloy sheet on a die, and closing a blank holder to hold the aluminum alloy sheet in a flange zone; filling a cavity of a die with an ultra-low temperature medium to cool a die cavity zone of the aluminum alloy sheet to a set low temperature, and forming an ultra-low temperature gradient in which the temperature of the die cavity zone is lower than the temperature in the flange zone; applying a set blank holder force to the blank holder, and controlling a punch to move downwards to form a deep-cavity thin-walled curved part; and controlling the punch to move upwards, opening the blank holder, and taking out the formed deep-cavity thin-walled curved part.
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公开(公告)号：US20210162482A1
公开(公告)日：2021-06-03
申请号：US17105138
申请日：2020-11-25
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Zhubin He , Jianshu Liu , Xiaobo Fan , Jiangxiang Yu
Abstract: A method for forming a large-size curved thin-walled metal skin is disclosed, wherein the position and size characteristics of stiffeners on a curved panel is extracted; the thickness of the curved panel and the thin-walled skin after assembly is assumed to be m, and a forming surface of the punch is offset outwards along a normal line by the thickness m to obtain the characteristics of the inner surface of a female die; the number of the discrete support moulds is set to be the same as the number n of the stiffeners based on the size and distribution of the stiffeners on the curved panel; and the punch and the female die combined with the discrete support moulds are used to carry out stamping of a curved thin-walled slab to obtain a required thin-walled skin component.
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公开(公告)号：US11459648B2
公开(公告)日：2022-10-04
申请号：US17189229
申请日：2021-03-01
Applicant: Dalian University of Technology
Inventor： Xiaobo Fan , Shijian Yuan , Zhubin He
Abstract: Provided is a performance controlling method for a high-strength aluminum alloy shell during an ultra-low temperature forming process. The present disclosure greatly improves the performance of an aluminum alloy sheet by applying an ultra-low temperature. The present disclosure cools the aluminum alloy sheet to an ultra-low temperature by using an ultra-low temperature cooling medium, so as to compensate for insufficient hardening caused by insufficient deformation and avoid cracking caused by increased deformation. The present disclosure cools the sheet blank zonally according to a deformation law of a desired curved part, and controls the ultra-low temperature distribution of the sheet blank during forming so as to promote the formation of a substructure in a small-deformation zone. In this way, the present disclosure improves a subsequent age-hardening effect, and corresponding uniformity of microstructure and performance, and effectively solves the problem of non-uniformity due to uneven deformation.
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公开(公告)号：US20220080488A1
公开(公告)日：2022-03-17
申请号：US17474752
申请日：2021-09-14
Applicant: Dalian University of Technology
Inventor： Shijian Yuan , Xiaobo Fan
Abstract: The present disclosure provides a device for super cryogenic forming of a metal thin-walled curved surface part, including a super cryogenic medium conveying and pressurizing unit, a press, a die unit and a control system. A blank holder cylinder, a blank holder slide, a deep drawing cylinder and a deep drawing slide are disposed on the press. The die unit includes a male die, a blank holder and a female die. The super cryogenic medium conveying and pressurizing unit includes an autoboosting cryogenic container. A cryogenic channel in the blank holder, a cryogenic channel in the female die and a cavity of the female die are communicated with an outlet of the autoboosting cryogenic container by cryogenic pipes, respectively. A cryogenic pump is disposed on the cryogenic pipe between the cavity of the female die and the autoboosting cryogenic container.
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Patent Agency Ranking
5.发明授权公开(公告)号：US11571731B2
公开(公告)日：2023-02-07
申请号：US16999486
申请日：2020-08-21
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Shijian Yuan , Xiaobo Fan
Abstract: The present invention discloses a method for ultra-low temperature forming an ultra-thin curved part of a high-strength aluminum alloy. The method includes the following steps: step 1: selecting a cladding with a suitable thickness according to a wrinkle limit of a sheet; step 2: stacking the sheet and the cladding, then putting into a die, and closing a blank holder; step 3: filling a cavity of a female die with an ultra-low temperature medium to cool the sheet to below −160° C.; step 4: applying a set blank holding force by the blank holder, and enabling a male die to go down to form a thin-walled curved part; and step 5: opening the die and taking out the formed thin-walled curved part. The present invention utilizes the favorable formability of the high-strength aluminum alloy at the ultra-low temperature and the instability resistance of the thick sheet.
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公开(公告)号：US11440076B2
公开(公告)日：2022-09-13
申请号：US17474752
申请日：2021-09-14
Applicant: Dalian University of Technology
Inventor： Shijian Yuan , Xiaobo Fan
Abstract: The present disclosure provides a device for super cryogenic forming of a metal thin-walled curved surface part, including a super cryogenic medium conveying and pressurizing unit, a press, a die unit and a control system. A blank holder cylinder, a blank holder slide, a deep drawing cylinder and a deep drawing slide are disposed on the press. The die unit includes a male die, a blank holder and a female die. The super cryogenic medium conveying and pressurizing unit includes an autoboosting cryogenic container. A cryogenic channel in the blank holder, a cryogenic channel in the female die and a cavity of the female die are communicated with an outlet of the autoboosting cryogenic container by cryogenic pipes, respectively. A cryogenic pump is disposed on the cryogenic pipe between the cavity of the female die and the autoboosting cryogenic container.
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公开(公告)号：US10960452B2
公开(公告)日：2021-03-30
申请号：US16499993
申请日：2018-12-10
Applicant: DALIAN UNIVERSITY OF TECHNOLOGY
Inventor： Shijian Yuan , Xiaobo Fan
IPC: B21D26/045 , B21D26/041 , C22C21/08 , C22C21/10 , C22C21/12 , B21D26/033 , B21D26/053
Abstract: The present invention discloses a method for pressure forming of an aluminum alloy special-shaped tubular component by using an ultra-low temperature medium. By means of the characteristics that the forming property of an aluminum alloy tube is greatly improved under ultra-low temperature conditions, a tube is cooled and pressurized in a die through an ultra-low temperature medium, so that the tube forms a special-shaped tubular component at an ultra-low temperature. In the method for pressure forming of an aluminum alloy special-shaped tubular component by using an ultra-low temperature medium, the ultra-low temperature medium is not only used for cooling the die and the tube, but also used for pressurization to achieve flexible loading of the tube, which is favorable for forming complex special-shaped tubular components with varied cross-sections.
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公开(公告)号：US10576524B1
公开(公告)日：2020-03-03
申请号：US16537382
申请日：2019-08-09
Inventor： Shijian Yuan , Zhubin He , Xiaobo Fan , Yanli Lin , Guofeng Wang , Chang Qi
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.
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9.发明授权公开(公告)号：US10449633B1
公开(公告)日：2019-10-22
申请号：US16391433
申请日：2019-04-23
Applicant: Dalian University of Technology
Inventor： Shijian Yuan , Xiaobo Fan
IPC: B23K26/26 , B23K20/12 , B23K9/025 , B23K103/10
Abstract: The present invention discloses a gas pressure forming method of an ellipsoid. The formability of a closed polyhedral shell including polar plates, ellipsoidal side flap plates, and welded joints is improved, and the closed polyhedral shell is pressurized into an ellipsoid by using compressed gas under a heating condition, specifically comprising: assembling and welding two polar plates and ellipsoidal side flap plates into a closed polyhedral shell; disposing an electrode on the closed polyhedral shell, energizing and heating to a preset temperature, and then inflating compressed gas into the shell; deforming the closed polyhedral shell under the action of internal gas pressure, stopping inflating gas until a desired curvature shell is obtained, discharging gas, and removing the electrode to obtain a formed ellipsoid.
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