Influence of ultrasonic vibration on micro-extrusion

Bunget, Cristina; Ngaile, Gracious

doi:10.1016/j.ultras.2011.01.001

Cited by 144 publications

(37 citation statements)

References 8 publications

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“…In vibration plastic deformation, the direction of friction force at the tool-workpiece interface reverses at every cycle of vibration, this "surface effect" changes the contact pressure characteristics at the interface and decreases friction [6]. Thus, the plastic deformation force of the material is reduced and the forming efficiency of metal is improved.…”

Section: -P3mentioning

confidence: 99%

“…At higher temperature, the viscosity of BMG is significantly reduced but, at the same time, the processing time is shortened because a risk of possible crystallization may occur in such forming conditions [3]. Previous studies showed that vibration can be applied in metal micro-forming to increase forming ability through the reduction of forming load and reduction of the friction at the interface between die and workpiece [6]. Jinpin Qu [7] studied the influence of polymer melt flowing under vibrating field by introduced electromagnetic vibration and mechanical vibration into the amorphous polymer forming, found that the vibration can significantly reduce the apparent viscosity of the polymer melt, and then deducing the constitutive relation of the apparent viscosity of polymer melt under vibrating field according to the "Free Volume" and "Dynamic Behaviour of Polymer Chains" theory.…”

Section: Introductionmentioning

confidence: 99%

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Micro-lateral extrusion of Zr₅₅Cu₃₀Al₁₀Ni₅bulk metallic glass under low-frequency vibration loading

Zheng

et al. 2015

MATEC Web of Conferences

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Abstract. The effect of vibration on the micro-forming ability of Zr 55 Cu 30 Al 10 Ni 5 bulk metallic glass in its supercooled liquid region was studied. The experiment of microextrusion was carried out under different amplitude (38 ∼ 760 N) and different frequency (0.1 ∼ 2.0 Hz) at a fixed temperature of 723 K. The extrusion length was taken as a measure to characterize the micro-forming ability. Results reveal that the extrusion length of bulk metallic glass is effectively improved under vibration loading, and increases with increasing loading frequency and amplitude, whereas the frequency dependence is stronger. The viscosity of bulk metallic glass declines under vibration loading because of a larger free volume concentration and surface effect caused by vibration. This research indicates that the vibration forming is an effective method to enhance the micro-forming ability of bulk metallic glasses.

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Section: -P3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Micro-lateral extrusion of Zr₅₅Cu₃₀Al₁₀Ni₅bulk metallic glass under low-frequency vibration loading

Zheng

et al. 2015

MATEC Web of Conferences

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“…[10] investigated the effect of superimposed ultrasonic vibration on the compression tests of commercially pure aluminium, and showed that the ultrasonic dynamic impact effect was the dominating mechanism for stress reduction in compression condition. Bunget and Ngaile [11] studied the effect of ultrasonic vibration on the micro extrusion process and concluded that the forming load greatly decreased and the surface of the micro-extruded parts was significantly improved when the ultrasonic vibrations were imposed. The reviewed studies show that the ultrasonic vibration has high potential for improving the quality of the formed parts and reducing forming load in the metal forming process at micro scale.…”

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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“…Therefore, the enhancement of the material flow during the process is required. As an approach to enhance the material deformation, ultrasonic vibration has been applied to the microforming processes such as micro-extrusion (Bunget and Ngaile, 2011), micro-upsetting (Hung and Tsai, 2013and Yao, et al, 2012, micro-forging (Kosuge and Yang, 2012), micro-deep drawing (Huang, et al, 2014). In particular, Hung et al (2013) demonstrated that the reduction of flow stress by ultrasonic vibration becomes more significant with decreasing the process dimensions.…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrasonic vibration on stress relaxation in micro-compression test with step motion

Yamaguchi

Bai

Shimizu

et al. 2015

Mechanical Engineering Journal

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In this study, to promote stress relaxation effect by the servo actuated step motion that stops the die motion at regular interval, a novel microforming process with combining ultrasonic vibration and the step motion was proposed. To investigate the effect of ultrasonic vibration on stress relaxation by step motion, a micro-compression test was carried out in different scale dimension with the specimen size of 0.5, 1.0 and 2.0mm in diameter and height. Stress relaxation by step motion was repeated for 6 times at constant strain interval. Ultrasonic vibration with amplitude of 1.2 and 2.4 μm was applied on the axial direction during the stress relaxation by step motion. As results, in the all process conditions, the stress drop increased with decreasing the specimen size. To investigate the size dependency of the effect of ultrasonic vibration on stress relaxation, the stress drop in the surface and inner grains was calculated based on the surface grain theory. The result showed that the stress drop in the surface grains was larger than that in the inner grains in similar scale dimension. Additionally, the stress drop in the surface grains increased with decreasing the specimen size. The possibility of improving the material formability by this process was experimentally demonstrated.

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Influence of ultrasonic vibration on micro-extrusion

Cited by 144 publications

References 8 publications

Micro-lateral extrusion of Zr₅₅Cu₃₀Al₁₀Ni₅bulk metallic glass under low-frequency vibration loading

Micro-lateral extrusion of Zr₅₅Cu₃₀Al₁₀Ni₅bulk metallic glass under low-frequency vibration loading

Study on micro nosing process assisted by ultrasonic vibration

Effect of ultrasonic vibration on stress relaxation in micro-compression test with step motion

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Influence of ultrasonic vibration on micro-extrusion

Cited by 144 publications

References 8 publications

Micro-lateral extrusion of Zr55Cu30Al10Ni5bulk metallic glass under low-frequency vibration loading

Micro-lateral extrusion of Zr55Cu30Al10Ni5bulk metallic glass under low-frequency vibration loading

Study on micro nosing process assisted by ultrasonic vibration

Effect of ultrasonic vibration on stress relaxation in micro-compression test with step motion

Contact Info

Product

Resources

About

Micro-lateral extrusion of Zr₅₅Cu₃₀Al₁₀Ni₅bulk metallic glass under low-frequency vibration loading

Micro-lateral extrusion of Zr₅₅Cu₃₀Al₁₀Ni₅bulk metallic glass under low-frequency vibration loading