Effects of superimposed high-frequency vibration on deformation of aluminum in micro/meso-scale upsetting

Yao, Zhehe; Kim, Gap-Yong; Faidley, LeAnn E.; Zou, Qingze; Mei, Deqing; Chen, Zichen

doi:10.1016/j.jmatprotec.2011.10.017

Cited by 143 publications

(44 citation statements)

References 23 publications

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“…At the same time, there is a lateral contact pressure between the punch and the foil, being responsible for the existence of the plastic deformation. Then, the surface roughness peaks of the burnished surface were planished 09004-p. 5 by the lateral surface of the punch. The bigger is the vibration amplitude, the smoother is the burnished surface.…”

Section: Effect Of the Vibration On The Surface Quality Of Cross Sectionmentioning

confidence: 99%

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Investigation into high-frequency-vibration assisted micro-blanking of pure copper foils

Wang

Guo

Shan

et al. 2015

MATEC Web of Conferences

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Abstract. The difficulties encountered during the manufacture of microparts are often associated with size effects relating to material, process and tooling. Utilizing acoustoplastic softening, achieved through a high-frequency vibration assisted micro-blanking process, was introduced to improve the surface finish in micro-blanking. A frequency of 1.0 kHz was chosen to activate the longitudinal vibration mode of the horn tip, using a piezoelectric actuator. A square hole with dimensions of 0.5 mm × 0.5 mm was made, successfully, from a commercial rolled T2 copper foil with 100 m in thickness. It was found that the maximum blanking force could be reduced by 5% through utilizing the high-frequency vibration. Proportion of the smooth, burnished area in the cut cross-section increases with an increase of the plasticity to fracture, under the high-frequency vibration, which suggests that the vibration introduced is helpful for inhibiting evolution of the crack due to its acoustoplastic softening effect. During blanking, roughness of the burnished surface could be reduced by increasing the vibration amplitude of the punch, which played a role as surface polishing. The results obtained suggest that the high-frequency vibration can be adopted in micro-blanking in order to improve quality of the microparts.

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Section: Effect Of the Vibration On The Surface Quality Of Cross Sectionmentioning

confidence: 99%

“…In 1955, F. Blaha and B. Langenecker found that the flow stress of materials would decrease when the ultrasonic vibration was applied [4], which was also observed in the micro upsetting [5]. This kind of softening effect was applied in different microforming processes, e.g.…”

Section: Introductionmentioning

confidence: 97%

Investigation into high-frequency-vibration assisted micro-blanking of pure copper foils

Wang

Guo

Shan

et al. 2015

MATEC Web of Conferences

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“…al. [8] found that high-frequency vibration on the compression test of pure aluminium can reduce forming stress, surface roughness and friction. The highfrequency vibration leading to acoustic softening was considered to be a much more efficient method to activate plastic deformation than pure heating.…”

Section: Introductionmentioning

confidence: 99%

Study on micro nosing process assisted by ultrasonic vibration

Chang¹,

Huang²

2018

MATEC Web Conf.

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Abstract. This study used experiments to investigate the effect of ultrasonic vibration on the micro nosing process of copper cup. The billets with 1 mm diameter and length were backwards extruded to form the cups with 0.1 mm wall thickness and 1.8 mm height. The cups were then used in micro nosing processes. A forming system with the ultrasonic vibration has been developed and installed on a precision press to conduct the experiments. An optical fibre sensor and a precession load cell were equipped on the ram of the press in order to accurately measure the load and stroke of the process. Two forming conditions with and without ultrasonic vibrations of 20 kHz were considered in this study. The results show that the ultrasonic vibration can improve the materials flow which leads to an even diameter along the shrunk region of the nosed cup. Moreover, the ultrasonic vibration greatly reduces the load in the micro nosing process of the copper cup.

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“…This phenomenon could result in malfunctions in application and machining process. Vibration, a classical phenomenon, indicates operating accuracy and stability of the structures, and long-term vibration may cause fatigue damage to the structures and reduce their service life [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Simulations and Experiments on Vibration Control of Aerospace Thin-Walled Parts via Preload

Zhang

2017

Shock and Vibration

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Thin-walled parts primarily comprise the entire piece of rough machining, and the material removal rate can surpass 95%. Numerous components with thin-walled structures are preferred in the aerospace industry for their light weight, high strength, and other advantages. In aerospace thin-walled workpiece machining processes and practical applications, they are excited by the vibration. The preload changing the modal stiffness of the part is found and this change causes continuous changes in the natural frequency. Researching on the influence of pretightening force on dynamic characteristics of thin-walled components is highly significant for controlling vibration. In this study, the typical aviation thin-walled part is the research object. Finite element numerical simulation and experimental verification are employed to analyze the dynamic characteristics of 7075 aluminum alloy thin-walled plates under different preloads for exploring the relationship between natural frequency and preload. The relationship is validated by comparative results. Both the simulation and experimental results show that the natural frequencies of plates increase following the augmentation of the preload. Thus, this research introduces the method where vibration of aerospace thin-walled parts is reduced by preload. For practical engineering application, a program showing the relationship between natural frequency and preload is written using Visual Basic language.

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Effects of superimposed high-frequency vibration on deformation of aluminum in micro/meso-scale upsetting

Cited by 143 publications

References 23 publications

Investigation into high-frequency-vibration assisted micro-blanking of pure copper foils

Investigation into high-frequency-vibration assisted micro-blanking of pure copper foils

Study on micro nosing process assisted by ultrasonic vibration

Simulations and Experiments on Vibration Control of Aerospace Thin-Walled Parts via Preload

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