Article
Materials Science, Multidisciplinary
Zhongyuan Shi, Yi Li, Jicai Liang, Ce Liang
Summary: The study combines experimental methods and numerical simulations to investigate the effect of different process parameters on the web thickness of profiles in flexible multi-point three-dimensional stretch bending, and identifies the optimal combination of parameters. The experimental results closely match the numerical simulations, verifying the effectiveness of the numerical simulation approach.
Article
Automation & Control Systems
Chuandong Chen, Jicai Liang, Yi Li, Ce Liang
Summary: This study investigates the factors influencing crease defects in the stretch bending process using multi-point roller dies. The crease defect becomes more pronounced with an increase in pre-stretching length, post-stretching length, and friction coefficient. The number of roller dies has a significant impact on the change in crease defects.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Jicai Liang, Chengxiang Han, Yi Li, Ce Liang, Wenming Jin
Summary: In the process of flexible 3D stretch bending, by adjusting the spacing between dies along the x-axis, the shape deviation difference of the non-contact zone profile near the clamp side and the middle of the profile can be reduced, improving processing accuracy and quality.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2022)
Article
Construction & Building Technology
Hailong Wang, Zhiwei Chen, Hedong Li, Xiaoyan Sun
Summary: This paper introduces a numerical method based on Fick's law and reaction kinetics for predicting the erosion process of concrete in sodium sulphate solution. The model considers the effects of ITZ, pore-filling, and chemo-mechanical damage on diffusivity, as well as uneven precipitation of gypsum and ettringite in concrete. Simulation results show that the ITZ has a significant impact on diffusion and expansion of concrete specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Fei Teng, Jicai Liang, Shaoqiang Wang, Qigang Han
Summary: Flexible 3D stretch bending (FSB) is a technology that uses multi-point molds to bend and deform profiles. The study found that the forming accuracy, bending moment, and bending deformation of the profile differ between the contact zone and the non-contact zone.
Article
Automation & Control Systems
Xiao Jing Liu, Ying Ying Zhou, Peng Chen, Chao Li, Jin Qin
Summary: In this paper, a rigid-flexible composite drawing warm forming process is proposed to improve the forming quality and fittability of 5A06 aluminum alloy complex bottom parts. The influence of this process on the forming process and fitting accuracy of the parts was explored through numerical simulation and forming experiments.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Automation & Control Systems
Ce Liang, Yadan Luo, Jicai Liang, Yi Li
Summary: This paper investigates the springback issue in multi-point stretch bending and establishes an analytical model for the relationship between springback error and stress. A springback prediction model is proposed and it shows more reliable prediction results compared to the traditional model under different bending radii. Furthermore, the secant method is used to calculate the springback compensation factor to control the springback error within an acceptable range for the profile.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Automation & Control Systems
Simon Wagner, Fabian Kayatz, Manuel Munsch, Cedric W. Sanjon, Marek Hauptmann, Antonio Delgado
Summary: Thermoforming is a complex process, and numerical simulations are an important tool for studying the interactions between the process and its parameters. Forming air impact thermoforming, which takes advantage of the flow inside the pressure chamber, is an effective deformation behavior. Structural simulation models can be used to approximately consider the effects of the flow field on the deforming plastic sheet.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Automation & Control Systems
Chuandong Chen, Jicai Liang, Yi Li, Ce Liang
Summary: Flexible stretch-bending of multi-point roller dies technology is a new three-dimensional forming technology that reduces die cost and improves production efficiency. This study focused on the effect of die arrangement on T-profile and L-profile, and found that the length of the non-contact area significantly influences the three-dimensional deformation of the profiles.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Pavel Solfronk, Jiri Sobotka, Sarka Bukovska, Josef Bradac
Summary: With the increasing usage of the finite element method, the concept of a virtual factory that treats the entire production process as a chain of interrelated technologies is gaining popularity. This paper focuses on the effect of residual stress on the seamed pipe end section, considering the influence of preceding welding. Numerical simulations are used to compare the resulting residual stress values with values measured experimentally using X-ray diffraction.
Article
Automation & Control Systems
Yi Li, Xiao Han, Jicai Liang, Fei Teng, Ce Liang
Summary: The paper introduces a flexible 3D stretch bending device that can form complex cross-sectional 3D parts with 2 degrees of freedom at once and discusses the factors influencing forming accuracy. By comparing numerical simulations with experimental results, methods to improve forming accuracy are further explored.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Jun Ma, Sigmund A. Tronvoll, Torgeir Welo
Summary: Three-dimensional (3D), flexible rotary stretch bending is a new forming technology that allows the manufacturing of complex components. An analytically-based method for modeling real-time forces in 3D rotary stretch bending was developed and assessed using experiments and finite element analysis. The findings facilitate analyzing force requirements and characteristics for improved product accuracy.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2023)
Article
Automation & Control Systems
Chuandong Chen, Jicai Liang, Fei Teng, Yi Li, Ce Liang
Summary: The paper introduces a springback compensation method based on variable compensation factor to accelerate iterative compensation convergence and effectively divide and optimize the springback compensation process of the workpiece, improving compensation accuracy.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Chang Wang, Zhen Qian, Paul A. Meehan, William J. T. Daniel, Shichao Ding
Summary: There is a growing demand for Advanced High-Strength Steel (AHSS) in the automotive sector due to its ability to offer similar strength and crash resistance at a lower mass. Conventional manufacturing techniques face difficulties in processing AHSS, leading to technical issues such as residual strains and springback. To address this, a new forming technique called Chain-die forming has been developed. This study proposes two methods for estimating the forming load in Chain-die forming and verifies them with experimental data, showing good agreement.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Automation & Control Systems
Davide Campanella, Gianluca Buffa, Ernesto Lo Valvo, Livan Fratini
Summary: A numerical approach was proposed in this research to determine an analytical expression of material formability in hot incremental forming processes. The Johnson-Cook material model was used and validated through experimental measurements, establishing an analytical expression of the fracture forming limit.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)