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.

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

IPC: B21D37/10 ,  B21D22/20 ,  B21D22/22 ,  B21D37/16 ,  B21D51/44

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.