Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (1): 188-199.doi: 10.13229/j.cnki.jdxbgxb20190169

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Springback prediction for double-curvature stiffened panel during milling

Chun-guo LIU1,2(),Xiao-tong YU1,2,Tao YUE1,2,Dong-lai LI1,2,Ming-zhe ZHANG1,2   

  1. 1.Roll-forging Research Institute，Jilin University，Changchun 130022，China
    2.College of Materials Science and Engineering，Jilin University，Changchun 130022，China
  • Received:2019-03-19 Online:2021-01-01 Published:2021-01-20

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Abstract:

Aiming at the springback problem during manufacturing process of aluminum alloy thin-walled parts， a springback prediction method for double-curvature stiffened panel in milling process was proposed. The method estimates the springback value in the two directions of the panel according to the redistribution of the residual stress after the material is removed layer by layer. The finite element simulation results show that the stress distribution and radius after springback of the panel during the milling process were close to the calculated results. The maximum stress variation in both directions appears when the milling depth reaches the initial neutral surface. When the remaining thickness decreases， the errors between calculation results and FEM results increase gradually. In addition， the simulation results of different single-layer milling thickness show that the larger the thickness of single-layer milling， the larger the error of this method， and the maximum error is 9.07%. The forming-milling experiments were performed to verify the proposed method. The results show that the proposed method could predict the springback of the double-curvature stiffened panel.

Key words: double-curvature panel, springback prediction, residual stress, finite element method（FEM）

CLC Number: 

  • TG386

Fig.1

Schematic diagram of computing model"

Fig.2

Schematic diagram of aluminum alloy panel"

Fig.3

Finite element model of bending-milling"

Fig.4

Bending-milling experiment"

Fig.5

Location of point selected"

Fig.6

Stress distribution in every layers of point selected"

Fig.7

Distribution of residual stress of sheet after bending"

Fig.8

Distribution of σx along the z-axis of sheet after milling"

Fig.9

Distribution of σy along the z-axis of sheet after milling"

Fig.10

Selecting position of springback path in milling"

Fig.11

Milling springback curve"

Fig.12

Comparison of error between finite element and calculation results with different bending radii"

Fig.13

Comparison of error between experiment and calculation results with different bending radii"

Fig.14

Distribution of σx along the z-axis after removal of 12 mm from sheet"

Fig.15

Springback error between calculation and finite element results of the panels for different single-layer milling thicknesses"

Fig.16

Comparison of error between finite element and calculation results with different thickness of stiffener"

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