Modeling and analysis of assembly variation with non-uniform stiffness condensation for large thin-walled structures

Gao, Chang; Yu, Haidong; Gu, Bin; Lin, Yujin

doi:10.1016/j.tws.2023.111042

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…Finally, f k , derived from this fusion, serves as guidance for generating the circular hole boundary segmentation. The structural components and computational procedures encompass the following: Encoder: The encoder comprises multiple layers responsible for extracting the circular hole boundary region from f e , as expressed in Equation (1).…”

Section: Encoding-decoding-attention Fusion Guidance Mechanismmentioning

confidence: 99%

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CHBS-Net: 3D Point Cloud Segmentation Network with Key Feature Guidance for Circular Hole Boundaries

Zhang,

Wang,

et al. 2023

Machines

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In laser scanning inspection systems for sheet metal parts, the rapid and accurate inspection of the high-precision holes is not only crucial but difficult. The accuracy of the circular holes, especially the locating datum holes on the parts, plays an important role in the assembly quality. However, accurately segmenting the circular hole boundary points required for circular hole fitting from large-scale scanning point cloud data remains one of the most difficult tasks for inspection accuracy improvement. To address this problem, a segmentation network called the circular hole boundary segmentation network (CHBS-Net) is proposed for boundary point cloud extraction. Firstly, an encoding–decoding–attention (EDA) fusion guidance mechanism is used to address the imbalance in data distribution due to the small proportion of boundary points in the overall point cloud. Secondly, a long short-term memory (LSTM) network parallel structure is used to capture the contour continuity and temporal relationships among boundary points. Finally, the interference of neighboring points and noise is reduced by extracting features in the multi-scale neighborhood. Experiments were performed using real cases from a sheet metal parts dataset to illustrate the procedures. The results showed that the proposed method achieves better performance than the benchmark state-of-the-art methods. The circular hole inspection accuracy is effectively improved by enhancing the segmentation accuracy of the scanning boundary points.

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Section: Encoding-decoding-attention Fusion Guidance Mechanismmentioning

confidence: 99%

“…The manufacturing quality of circular holes in automobile manufacturing seriously affects the assembly accuracy and directly affects the product quality [1]. To ensure the manufacturing quality of these holes, laser scanning inspection techniques are usually used.…”

Section: Introductionmentioning

confidence: 99%

CHBS-Net: 3D Point Cloud Segmentation Network with Key Feature Guidance for Circular Hole Boundaries

Zhang,

Wang,

et al. 2023

Machines

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“…The thin-walled complex components are widely used in the astronautic, aeronautic, and automobile industries [1][2][3]. In the last few decades, the shape of the component has become increasingly complex [4,5], hard-to-deform materials are widely employed [6,7], and the accuracy demand is greatly improved [8,9].…”

Section: Introductionmentioning

confidence: 99%

Effect of the non-uniform pressure on the deformation and instability of the sheet in flexible-die bulge forming

Wang,

Wang

2024

Preprint

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In recent years, the application of non-uniform pressure in flexible-die forming, such as viscous pressure forming and magnetorheological pressure forming, has been utilized in manufacturing many thin-walled components. However, the non-uniform pressure is mainly applied to change the shape of the sheet. The effects of the non-uniform pressure on thickness reduction and fracture are still intricate. In this study, the mechanism of the non-uniform pressure to decrease thickness reduction and delay fracture instability in the bulge test is revealed. The non-uniform pressure changes the principal stresses, causing distinct deformation behaviors. There are two opposite effects on thickness reduction and fracture instability. If the pressure at the bulged pole decreases, the shape is more prolate, leading toa decreased average thickness and a decreased polar curvature. The thickness reduction tends to be severe, and the diffuse necking is easy to produce. If the pressure at the bulged pole increases, the shape is more oblate, leading to an increased strain gradient. The thickness reduction tends to be severe, and the localized necking is easy to produce. Characteristics of the pressure to decrease thickness reduction and delay instability are presented. Viscous pressure bulge tests are carried out. Experiment results of the shape, thickness uniformity, polar strain, and fracture verify the theory. The fracture strain increases by 5.6 % compared with the uniform pressure condition. This study proves that non-uniform pressure can promote sheet formability, indicating that non-uniform pressure has broad application prospects in sheet metal forming.

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Construction of digital twin for clamped near-net-shape blade in adaptive manufacturing

Guo,

Ren,

Liang

et al. 2023

Journal of Manufacturing Processes

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Modeling and analysis of assembly variation with non-uniform stiffness condensation for large thin-walled structures

Cited by 3 publications

References 17 publications

CHBS-Net: 3D Point Cloud Segmentation Network with Key Feature Guidance for Circular Hole Boundaries

CHBS-Net: 3D Point Cloud Segmentation Network with Key Feature Guidance for Circular Hole Boundaries

Effect of the non-uniform pressure on the deformation and instability of the sheet in flexible-die bulge forming

Construction of digital twin for clamped near-net-shape blade in adaptive manufacturing

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