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TECHNICAL PAPERS

Modeling and Simulation of Shrinkage During the Picture Tube Panel Forming Process

[+] Author and Article Information
Huamin Zhou1

State Key Laboratory of Mold & Die Technology, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, People’s Republic of Chinahmzhou@263.net

GuoDong Xi, Dequn Li

State Key Laboratory of Mold & Die Technology, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, People’s Republic of China

1

Corresponding author.

J. Manuf. Sci. Eng 129(2), 380-387 (Sep 02, 2006) (8 pages) doi:10.1115/1.2673274 History: Received February 09, 2006; Revised September 02, 2006

The accurate prediction of residual stresses and shrinkage of the formed picture tube panel is important to achieve high quality and precision of the final product. In this paper, the numerical simulation of shrinkage of molded panels was carried out in consideration of the residual stresses accumulated during both the packing and free-to-contract stages. For residual stress analysis, a thermorheologically simple viscoelastic material model was introduced to consider the stresses relaxation effect and to describe the mechanical behavior according to the temperature change. The deformation of molded parts induced by the residual stresses was calculated based on the theory of shells, represented as an assembly of flat elements formed by combining the constant strain and the discrete Kirchhoff triangular elements. The simulation results of the developed program were side verified by comparing the dimensional accuracy of the panels produced by the molds, which compensated for a uniform part shrinkage or the predicted ununiform part shrinkage.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Deformation decomposition of shell element in the local coordinate system

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Figure 2

Forming process of the picture tube panel

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Figure 3

Cross-sectional view of a panel mold: (1) plunger stem, (2) coolant tank, (3) mold ring, (4) mold punch, (5) picture tube panel, (6) cavity plate

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Figure 4

Measurement points on the part surface in the experiments

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Figure 5

Temperature of several points at the surface of the part

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Figure 6

Evaluation of the temperature distribution along the thickness direction of point 1

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Figure 7

Final in-plane residual stresses distributions along the thickness direction of points 1–3

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Figure 8

Computed shrinkage of the panel, a cross-sectional display with magnification of 5: the gray frame is the designed model and the color shaded is that after shrinkage

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