Deformation Analysis in Ultrasonic-Assisted Multi-stage Incremental Sheet Forming

Cheng, Zinan; Li, Yanle; Li, Fangyi; Li, Jianfeng

doi:10.1007/978-3-030-75381-8_36

Cited by 4 publications

(3 citation statements)

References 22 publications

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“…Experiments are carried out through two kind of pressing processes to obtain the relationship between the pressing time and the compact density and the experimental results are compared with the simulation results, as shown in Figure 10. It can be seen from the figure that the experimental and simulated compact density errors are not large, and the errors in the forming process are both lower than 10%, indicating that the finite element simulation and experimental results are relatively consistent [23]. When the density is greater than 5 g/cm 3 , the error between the experimental value and the simulation value is greater than 6%, mainly because the finite element simulation regards the friction coefficient between the particles and between the particles and the mold as a fixed value during the particle forming process, while the friction coefficient between the particles and between the particles and the mold in the actual pressing process is a constantly changing process, especially the deformation and displacement of the particles in the middle and late pressing period are complicated.…”

Section: Experimental Verificationmentioning

confidence: 74%

Microscopic Mechanism of Ultrosonic Vibration Assisted Pressing WC-Co Powder by Simulation

Chen¹,

Xie²,

Wang³

et al. 2023

Preprint

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The ultrasonic vibration assisted pressing process can improve the fluidity, the uneven distribution of density and particle size of WC-Co powder. However, the microscopic mechanism of ultrasonic vibration on the powder remains unclear. In this paper, WC and Co particles are simulated by three-dimensional spherical models of two particle sizes with the aide of the secondary development of Python. At the same time, the forming process of powder at mesoscale is simulated in the virtue of the finite element analysis software ABAQUS. The influence of vibration amplitude on the fluidity, the filling density and the stress distribution of WC-Co powder is investigated when the ultrasonic vibration is applied to the conventional pressing process. From simulation results, the ultrasonic vibration amplitude has great influences on the density of the compact. With the increase of the ultrasonic amplitude, the compact density also increases gradually. At the initial stage of the compaction, the particles move violently under the action of ultrasonic vibration, the fluidity is obviously enhanced, the arch bridge effect between particles is destroyed, the fine particles quickly fill the pores between the large particles, which increase the density, and the residual stress in the billet decreases after the compaction. From the experimental results, the size distribution of the billet is more uniform, the elastic aftereffect is reduced, the dimensional instability is improved, and the density curves obtained by experiment and simulation are within a reasonable error range.

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Section: Experimental Verificationmentioning

confidence: 74%

Microscopic Mechanism of Ultrosonic Vibration Assisted Pressing WC-Co Powder by Simulation

Chen¹,

Xie²,

Wang³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Experiments were carried out using two kinds of pressing processes to obtain the relationship between the pressing time and the compact density, and the experimental results were compared with the simulation results when the amplitude of vibration was 3 μm, as shown in Figure 10 . It can be seen from the figure that the experimental and simulated compact density errors are not large, and the errors in the forming process are both lower than 10%, indicating that the finite element simulation and experimental results are relatively consistent [ 25 ]. When the density is greater than 5 g/cm 3 , the error between the experimental value and the simulation value is greater than 6%, mainly because the finite element simulation regards the friction coefficient between the particles and between the particles and the mold as a fixed value during the particle-forming process, while the friction coefficient between the particles and between the particles and the mold in the actual pressing process is a constantly changing process.…”

Section: Resultsmentioning

confidence: 99%

Investigating the Microscopic Mechanism of Ultrasonic-Vibration-Assisted-Pressing of WC-Co Powder by Simulation

et al. 2023

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The ultrasonic-vibration-assisted pressing process can improve the fluidity and the uneven distribution of density and particle size of WC-Co powder. However, the microscopic mechanism of ultrasonic vibration on the powder remains unclear. In this paper, WC particles with diameter 5 μm and Co particles with diameter 1.2 μm were simulated by three-dimensional spherical models with the aid of the Python secondary development. At the same time, the forming process of the powder at the mesoscale is simulated by virtue of the finite element analysis software ABAQUS. In the simulation process, the vibration amplitude was set to 1, 2, and 3 μm. Their influence on the fluidity, the filling density, and the stress distribution of WC-Co powder when the ultrasonic vibration was applied to the conventional pressing process was investigated. The simulation results show that the ultrasonic vibration amplitude has a great influence on the density of the compact. With an increase in the ultrasonic amplitude, the compact density also increases gradually, and the residual stress in the billet decreases after the compaction. From the experimental results, the size distribution of the billet is more uniform, the elastic after-effect is reduced, the dimensional instability is improved, and the density curves obtained by experimentation and simulation are within a reasonable error range.

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“…Li et al [19] used a variety of forming strategies to create a frustum of cone with a 30° wall angle in order to investigate the effect of the number of forming stages (n) and the incremental wall angle between adjacent stages ( ) on the formability of ISF. Cheng et al [20] demonstrate the thickness distribution effect of ultrasonic vibration (UV). It is discovered that by introducing UV, the thickness distribution can be significantly improved.…”

Section: Introductionmentioning

confidence: 99%

Improving the formability during ultrasonic-assisted multi-stage incremental sheet forming

Ghafoor

Zhao

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Multi-stage sheet forming is an encouraging technique to obtain complex geometries by change of the design of intermediate stages. Due to the occurrence of stepped feature during multi-stage forming, the final geometry shape is affected and the formability is deteriorated. To eliminate fracture and enhance formability, ultrasonic assistance is integrated with the multi-stage sheet forming process. The present work aims to investigate the effect of ultrasonic-vibrations (UV) on formability and thickness evolution using two multi-stage strategies through experiments. A frequency of 29 kHz and an amplitude of 10 μm are taken for the ultrasonic-assisted incremental forming process. Firstly, two distinct strategies are compared by experiments. Secondly, thorough investigation of formability experiments is performed by applying the UV at only one or two stages instead of the complete multi-stage forming process. The results show that formability of the part is increased while applying UV at intermediate stages. Similarly, it is confirmed that UV is more advantageous during latter stage of experiment. This work provides an effective strategy to improve the formability of the incremental sheet forming process by using the ultrasonic vibrations in a smart way.

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Deformation Analysis in Ultrasonic-Assisted Multi-stage Incremental Sheet Forming

Cited by 4 publications

References 22 publications

Microscopic Mechanism of Ultrosonic Vibration Assisted Pressing WC-Co Powder by Simulation

Microscopic Mechanism of Ultrosonic Vibration Assisted Pressing WC-Co Powder by Simulation

Investigating the Microscopic Mechanism of Ultrasonic-Vibration-Assisted-Pressing of WC-Co Powder by Simulation

Improving the formability during ultrasonic-assisted multi-stage incremental sheet forming

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