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1.发明授权公开(公告)号：US11577297B2
公开(公告)日：2023-02-14
申请号：US16627795
申请日：2018-11-29
Applicant: Harbin Institute of Technology
Inventor： Shijian Yuan , Wei Liu
IPC: B21D26/041
Abstract: An accurate springback compensation method for sheet hydroforming component based on liquid volume control is related to a springback compensation method for curved surface part hydroformed with liquid as a punch during deep drawing process. According to the difference between a theoretical volume and a post-springback volume of a target part, an elastic deformation of the die is induced by liquid pressure, the die deformation amount is controlled to be equal to the springback amount. The accurate springback compensation control of a curved surface part is realized to overcome the problems of thickness or mechanical properties variations for different batches of sheets, and the manufacture error of the mould is considered to meet the design requirements. The liquid volume compensation is on-line and in-situ performed without mould re-machining. The advantages is good precision, simple process, high efficiency, short cycle and low cost.
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公开(公告)号：US20240068793A1
公开(公告)日：2024-02-29
申请号：US18108888
申请日：2023-02-13
Applicant: Harbin Institute of Technology
Inventor： Xiaolei Cui , Shijian Yuan
CPC classification number: G01B5/12 , G01B3/34 , G01B5/06 , G01L1/2287 , G01L19/0092
Abstract: A method for measuring an r-value of a tube in a circumferential direction: determine a size of an annular sample, and cutting the sample from a to-be-measured tube; making speckles or circular grids on an outer surface of the sample; sleeving the annular sample in a middle of an outside of a ring segmented rigid die; filling a liquid bag with a fluid medium and controlling an internal pressure, and driving the ring segmented rigid die to move outward uniformly in a radial direction using a uniformly distributed load generated by pressurizing the liquid bag, so as to cause equal diameter bulging of the annular sample; measuring strain in width and circumferential directions in a speckle or circular grid region on the annular sample; and determining the plastic strain ratio of the tube in the circumferential direction according to the strain in the width and circumferential directions.
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3.发明公开公开(公告)号：US20230173567A1
公开(公告)日：2023-06-08
申请号：US17603954
申请日：2021-07-23
Applicant: Harbin Institute of Technology
Inventor： Shijian Yuan , Wei Liu
CPC classification number: B21D37/10 , B21D22/22 , B21D22/205 , B21D37/16 , B21D51/44
Abstract: Disclosed are an apparatus and a method for deep drawing of large-sized thin-wall curved surface parts with servo reverse bulging, which pertain to the technical field of drawing of a thin-wall curved surface part. The apparatus includes a forming die, a jacking unit, and a power unit, wherein the forming die includes an upper die, a lower die, and a blank holder. The upper die and the blank holder are connected to a press machine, the blank holder is disposed above the lower die, and a blank to be drawn is placed between the lower die and the blank holder; the jacking unit is disposed inside the lower die and adapted to move along a moving direction of the upper die, enabling the blank to be drawn to deform by with reverse bulging. The method can inhibit defects of wrinkling and cracking in drawing processes effectively.
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公开(公告)号：US11660653B2
公开(公告)日：2023-05-30
申请号：US17339460
申请日：2021-06-04
Applicant: Harbin Institute of Technology
Inventor： Cong Han , Shijian Yuan , Xiaolei Cui
IPC: B21D26/00 , B21D26/041
CPC classification number: B21D26/041
Abstract: The present disclosure discloses an ultra-low pressure liquid filling forming system for a special-shaped component, including a control system, a supercharger, a driving device, a preforming unit, and a final forming unit. The present disclosure further provides an ultra-low pressure liquid filling forming method for a special-shaped component, including the following steps: S1: making an equal diameter cylindrical coil blank with an overlapping part in a longitudinal direction by using a plate blank; S2: bulging the equal diameter cylindrical coil blank into a variable diameter cylindrical prefabricated coil blank; S3: cutting and welding the overlapping part remaining on the variable diameter cylindrical prefabricated coil blank in the axial direction to obtain a variable diameter prefabricated tube blank; S4: filling liquid and press-forming the variable diameter prefabricated tube blank, so that the variable diameter prefabricated tube blank occurs compressive deformation, thereby forming the special-shaped component.
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公开(公告)号：US10589504B2
公开(公告)日：2020-03-17
申请号：US16094626
申请日：2016-12-27
Applicant: Harbin Institute of Technology
Inventor： Zhubin He , Kun Zhang , Haihui Zhu , Shijian Yuan
IPC: B32B3/00 , B32B15/00 , B32B37/00 , B32B38/00 , B32B37/12 , B32B38/18 , B32B3/26 , B32B15/01 , B23P15/00
Abstract: A lamination manufacturing method for large-sized metal components with complicated structures is provided, relating to a part manufacturing method to solve the problem that traditional machining, entire plastic forming and the existing additive manufacturing method are difficult to manufacture large-sized metal components with complicated special-shape structure and high-performance requirement. The manufacturing method includes the steps: step 1. obtaining a three-dimensional digital model of a large-sized metal component with complicated structure, and dividing the model into a plurality of slice layers; step 2. selecting the actually available metal sheet corresponding to the thickness of each slice layer divided in step 1, and machining each metal sheet to obtain a shaped sheet consistent with the model of each slice layer in step 1; step 3. stacking the shaped sheets obtained through machining of step 2 according to the order of the corresponding slice layers in step 1; and step 4. obtaining a required large-sized metal component with complicated structure after all the shaped sheets are connected into a whole. The present invention is used for shaping large-sized components with complicated deep cavity and inner hole structures.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20200078848A1
公开(公告)日：2020-03-12
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 , C22F1/18 , C22F1/02
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) controllalbe-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, achieveing 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.
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公开(公告)号：US09808850B2
公开(公告)日：2017-11-07
申请号：US15340776
申请日：2016-11-01
Applicant: HARBIN INSTITUTE OF TECHNOLOGY (WEIHAI)
Inventor： Guannan Chu , Yanli Lin , Shijian Yuan
IPC: B21D26/02 , B21D26/033 , B21D19/00 , B21D26/045 , B21D26/039 , B21D15/03 , B21D26/041
CPC classification number: B21D26/033 , B21D15/03 , B21D19/00 , B21D26/039 , B21D26/041 , B21D26/045
Abstract: A process for forming a hollow member with A complicated cross-section wherein a section of a tube blank first undergoes a bending deformation due to its internal pressure and bend moment generated by the upsetting of an upper die, and is then compressed to be molded under the support of the internal pressure. The process of the invention does not require the reshaping step at an increased pressure. The process can make a hollow member with a complicated cross-section formed under a low pressure, and solves a technical bottleneck relating to a conventional process for forming this kind of members that is subject to an ultrahigh pressure generator.
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公开(公告)号：US11175206B2
公开(公告)日：2021-11-16
申请号：US16704546
申请日：2019-12-05
Inventor： Xiaosong Wang , Weilong Hu , Shijian Yuan
Abstract: Disclosed are a tube pure shear loading device and method. A first mandrel penetrates into a first half tube, and a second mandrel penetrates into a second half tube. The size of the first mandrel matches the size of the first half tube, and the size of the second mandrel matches the size of the second half tube. A first connecting portion of the first mandrel and a second connecting portion of the second mandrel are loaded, and a first protruding portion and a second protruding portion transmit a force to a to-be-tested tube, so that a material of a whole tube in the same plane as a right plane or a left plane of the first half tube and a left plane or a right plane of the second half tube is in a pure shear stress state.
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9.发明申请公开(公告)号：US20210130016A1
公开(公告)日：2021-05-06
申请号：US16715093
申请日：2019-12-16
Applicant: Harbin Institute of Technology
Inventor： Shijian Yuan , Xiaolei Cui
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.
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公开(公告)号：US10940520B2
公开(公告)日：2021-03-09
申请号：US16484959
申请日：2018-10-17
Applicant: HARBIN INSTITUTE OF TECHNOLOGY
Inventor： Shijian Yuan
IPC: B21D26/027 , B21D26/041
Abstract: Some embodiments of the disclosure provide methods and systems for controlling dimensions of metal hydroformed parts. According to an embodiment, a control method includes: obtaining an inner cavity volume of a target part and an inner cavity volume of a tube blank; injecting a liquid into the tube blank under a high pressure condition; determining a liquid volume compression compensation quantity according to the inner cavity volume of the target part; determining a liquid volume increment-target part corner radius relationship according to the inner cavity volume of the target part, the inner cavity volume of the tube blank, and the liquid volume compression compensation quantity; determining a liquid volume increment according to the liquid volume increment-target part corner radius relationship; and controlling dimensions of a metal hydroformed part according to the liquid volume increment.
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