Shearing characteristics in ultrasonic vibration-assisted piercing of fine-grained stainless steel foils

Mita, Ken; Hu, Jun; Shimizu, Tetsuhide; Yang, Ming

doi:10.1016/j.promfg.2018.07.287

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…When investigating the effect of ultrasonic vibration on the punching forming force and its forming quality, for rigid punch, the analysis can be performed directly by whether ultrasonic was applied or not 3 , 5 – 7 . However, in the flexible punch forming like Micro-USF, the ultrasonic vibration converts the plastic powder into a viscous flow state of the flexible punch.…”

Section: Methodsmentioning

confidence: 99%

“…Yeh et al studied the effect of ultrasonic vibration on shearing load and the micro-hole edge contour and found that the average punching load was reduced by 12% and the burr height was also decreased 6 . Mita et al applied ultrasonic vibration with a frequency of 60.5 kHz on the punch, and conducted the punching experiment on the stainless steel sheet with 100 μm m thickness 7 . The results showed that the shear load decreased with the ultrasonic amplitude increasing and the maximum shear load could be reduced by 60%, which indicated that vibration could reduce the forming force and improve the cross-section quality of punching workpieces.…”

Section: Introductionmentioning

confidence: 99%

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Effect of ultrasonic vibration on forming force and forming quality in micro-punching with a flexible punch

Liu

Zhang

et al. 2022

Sci Rep

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In this paper, a special ultrasonic microforming method, Micro Ultrasonic thin Sheetmetal Forming using molten plastic as a flexible punch (short as Micro-USF), was used to conduct micro-punching experiments on stainless steel sheet with thickness of 10 μm and 20 μm. The influence of ultrasonic vibration on forming force and forming quality were investigated. The experimental results showed that the forming force required for punching thin sheet metal decreased gradually as the ultrasonic time or ultrasonic power increased. By applying the ultrasonic vibration effect, the forming force could be decreased dramatically and the maximum value of forming force drop could reach 86%. Moreover, with the application of ultrasonic vibration, the size accuracy and shape accuracy of micro-holes could be increased by 36.92% and 22.65%, but the cross-section quality of micro-holes were not significantly improved.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of ultrasonic vibration on forming force and forming quality in micro-punching with a flexible punch

Liu

Zhang

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…From the last decade, the application of ultrasonic assistance has been attracting increasing attention in microforming. (1)(2)(3)(4)(5)(6)(7)(8) The benefits of ultrasonic vibration in microforming mainly include the surface and volume effects. The surface effect can lower the interfacial friction force between vibrated tools and specimens, (9) resulting in a better surface finishing, (10) and has been well studied in the past.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Material Deformation Characteristics of Ultrasound-assisted Microcompression with Dynamic Force Sensing Technology

Hu¹,

Shimizu²,

Yang³

2019

Sensors and Materials

Self Cite

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Ultrasonic vibration is a promising assistant technology to improve the microforming processes, for example, decreasing friction, enhancing surface finishing, and reducing forming load/stress. However, the mechanism behind the forming stress reduction due to ultrasonic vibration, so-called acoustic softening, is still not totally understood, because in most previous research studies, a simplified force sensing technology, which could not measure the real dynamic ultrasonic force during deformation, was used. In order to solve this issue, an ultrasound-assisted microcompression test system with a die-embedded dynamic force sensor was developed for studying the evolution of acoustic softening. With this system, the stress reduction by acoustic softening can be obtained by separating the stress reduction by stress superposition, which is just an apparent stress reduction due to the averaging of the dynamic oscillatory stress. Then, the stress reduction by stress superposition is verified using a theoretical model, confirming the reliability of the test system. Thus, the evolution of material deformation characteristics can be analyzed. By comparing the stress superposition to acoustic softening, it is found that stress superposition is greater than acoustic softening at the beginning of deformation, especially with a smaller ultrasonic amplitude. Even as the ratio of stress superposition to acoustic softening gradually decreases to some extent with increasing strain, stress superposition still accounts for nearly half of the total stress reduction. The results emphasize the importance of the dynamic force sensing technology in ultrasound-assisted microforming and provide some instructive understanding of the mechanism of acoustic softening.

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Ultrasonic vibration-assisted multi-scale plastic forming of high-entropy alloys in milliseconds

Wen

et al. 2022

Rare Met.

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Shearing characteristics in ultrasonic vibration-assisted piercing of fine-grained stainless steel foils

Cited by 6 publications

References 10 publications

Effect of ultrasonic vibration on forming force and forming quality in micro-punching with a flexible punch

Effect of ultrasonic vibration on forming force and forming quality in micro-punching with a flexible punch

Investigation on Material Deformation Characteristics of Ultrasound-assisted Microcompression with Dynamic Force Sensing Technology

Ultrasonic vibration-assisted multi-scale plastic forming of high-entropy alloys in milliseconds

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