Light thin plate glue-containing rolling forming coupling modeling and quality prediction method

A quality prediction, fluid-solid coupling model technology, applied in the direction of instruments, electrical digital data processing, geometric CAD, etc., can solve the problems of high forming accuracy, mesh distortion, calculation divergence, etc., to improve the forming prediction accuracy, improve Prediction accuracy and the effect of optimizing process parameters

Active Publication Date: 2020-06-02
TONGJI UNIV
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  • Abstract
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Problems solved by technology

Adhesive flows in the narrow gap between the inner and outer plates, and the influence of conventional test methods on the adhesive is difficult to measure and quantify
Since the rolling process with adhesive involves the fluid-solid coupling effect of free liquid surface movement, there are still deficiencies in the use of existing numerical algorithms, and it is difficult to build an accurate numerical prediction model. The main problems and difficulties are as follows:
[0007] (1) The Lagrangian method is efficient, but it is easy to encounter grid distortion when calculating large deformations, which eventually leads to calculation divergence
[0008] (2) The Euler m

Method used

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  • Light thin plate glue-containing rolling forming coupling modeling and quality prediction method
  • Light thin plate glue-containing rolling forming coupling modeling and quality prediction method
  • Light thin plate glue-containing rolling forming coupling modeling and quality prediction method

Examples

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specific Embodiment

[0051] like figure 1 As shown in , the complex structure of the car door is complex, with various structural forms, such as curved surface-curve rolling structure 6, flat-convex rolling structure 7, flat-concave rolling structure 8, flat-linear rolling structure 9, etc. .

[0052] According to the rolling process, there are mainly 5 steps, and the sequence is: flanging, gluing, gluing, pre-flanging, and final flanging.

[0053] as figure 2 The shown planar curved aluminum alloy sheet with adhesive roll-in structure is an example:

[0054] (1) Adhesive material characteristics

[0055] Use a rotational viscometer to measure the relationship between the dynamic viscosity of the adhesive and the shear rate, such as image 3 As shown, then according to the curve, the rheological model is determined to be a power-law non-Newtonian fluid, and the constitutive model is:

[0056] τ=K·γ^n

[0057] (2) Material tensile test

[0058] Using a universal material stretching machine,...

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Abstract

The invention relates to a numerical modeling and quality prediction method capable of quantifying the influence of an adhesive on rolling forming of a light thin plate, which is beneficial to improving the manufacturing precision and quality of a light door cover part and providing a reference basis for improving and optimizing rolling and pressing process parameters. First, material properties of the adhesive and the lightweight sheet are determined. Then, establishing a geometric model of the adhesive-light thin plate, simulating the adhesive by adopting a meshless smooth particle method SPH, simulating the light thin plate by adopting a finite element method FEM, and establishing a fluid-solid coupling model of the SPH-FEM; and finally, under boundary and load constraint conditions, finishing rolling process simulation and quality prediction of the light sheet containing the adhesive. Compared with the prior art, the method has the following beneficial effects: (1) the optimizationof the constitutive model of the adhesive is facilitated; and (2) the coupling algorithm is beneficial to improving the forming prediction precision of the light thin plate. And (3) the distributionof the adhesive is favorably controlled.

Description

technical field [0001] The invention relates to the technical field of automobile thin plate forming and manufacturing, in particular to a lightweight thin plate containing rubber roller forming coupling modeling and a quality prediction method. Background technique [0002] The quality of the door cover not only determines the static perception of the vehicle, but also has an important impact on the dynamic performance NVH, reflecting the advanced level of manufacturing technology. The structural optimization of the door cover is an important part of the lightweight body. Materials used in lightweighting include high-strength steel, carbon fiber materials, aluminum alloy materials and other alloy materials. Among them, aluminum alloy has become the material of choice for lightweight body door covers due to its high weight reduction rate, high strength, good formability and no need for surface treatment. [0003] The assembly and connection of the inner and outer panels of...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F30/15G16C60/00G06F113/24
CPCG16C60/00
Inventor 朱文峰李建军
Owner TONGJI UNIV
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