Study on size effect affected progressive microforming of conical flanged parts directly using sheet metals

Zheng, Jun-Yuan; Yang, Hui; Fu, Ming; Ng, C.F.

doi:10.1016/j.jmatprotec.2019.05.007

Cited by 36 publications

(14 citation statements)

References 38 publications

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“…In conclusion, with the increase in the β grain size, the extrusion force increased. However, research literature [18,33] revealed that the flow stress has an apparent decreasing tendency with the coarsening of initial…”

Section: The Effect Of β Grains On the Extrusion Forcementioning

confidence: 99%

“…The research by Zhang et al [17], showed that fine grains of austenite SS 316L metallic sheet with a thickness of 100.0 µm had higher yield stress of 260.5 MPa than coarse grains of 196.5 MPa by the monotonic uniaxial tensile tests. Zheng et al [18] discovered that the forming pressure decreased with the increased grain size of pure copper in the progressive forming process. The coarse grains facilitated the forming of desirable geometries and reduced dimples on the shearing surface.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Holding Time on the Extrusion Force and Microstructure Evolution during the Plastic Forming of Ti-6Al-4V Micro-Gears

Yan

Zhang²,

Huang

et al. 2022

Materials

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The application of titanium alloy micro-gears in microelectromechanical systems has been severely restricted, as the graphite mold is prone to abrasion or even to crack at high temperatures, mainly due to the forming load. We aimed to manufacture Ti-6Al-4V alloy micro-gears through hot extrusion under an electric field and to clarify the influence of holding time on the extrusion force. The results suggest that the formed gears had a complete filling and clear tooth profile. Moreover, the contact resistance and current density caused a gradient temperature distribution inside the billet, resulting in a carburized layer and inhomogeneous β grains. The extrusion force increased with an increased holding time, which can be ascribed to the increase in the thickness of the carburized layer and the β grain size. Among these two factors, β grain size played a leading role in the extrusion force. Continuous dynamic recrystallization dominated the deformation in a single β phase, and the misorientation of the transformed α laths from β grains followed the Burgers orientation relationship. This study may pave the way for the extrusion forming of other titanium alloy micro-components.

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Section: The Effect Of β Grains On the Extrusion Forcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Holding Time on the Extrusion Force and Microstructure Evolution during the Plastic Forming of Ti-6Al-4V Micro-Gears

Yan

Zhang²,

Huang

et al. 2022

Materials

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“…Xu et al [20] conducted micro-blanking tests to study the size effect in this process using brass foil and revealed that ultimate shear strength increases when the thickness of the material decreases and the deformation behaviors of the material are linked to the clearance and grain size. Moreover, Zheng et al [21][22][23] designed and developed several microforming systems including compound and progressive microforming to fabricate parts with different features, scales and grain sizes to investigate deformation behaviors, material flow phenomena and the undesirable geometries formed in the fabricated parts. They also revealed the size effect on different multiscale forming processes, which offered a research foundation for future research on compound and progressive microforming.…”

Section: Introductionmentioning

confidence: 99%

Study on Size-Related Product Quality of Multiscale Central-Punched Cups Fabricated by Compound Forming Directly Using Brass Sheet

Zheng

2022

Preprint

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Meso/microforming has gained much more attention in the last decades and is widely used as a reliable method to fabricate meso/micro-scaled metallic components. In this research, a compound meso/microforming system which combines deep drawing, punching and blanking operations was developed to fabricate multiscale central-punched cups by using brass sheets. The parts with three scales were produced by using the brass sheets with various thicknesses and grain sizes to investigate geometrical and grain size effects on the deformation behaviors, dimensional accuracy, and material flow behaviors in the forming process. Through physical experiments and finite element simulations, it is revealed that the ultimate deformation load in the drawing-punching stage is smaller than that in the single deep drawing stage under microscale, but the results in the meso-scaled scenarios are opposite. In addition, the thickness variation is increased with grain size, but the variation of the normalized thickness variation does not show an obvious tendency with different size scales. In the bending area, the material flow is tangential to the thickness direction, leading to the formation of thinning area. In addition, the material flow is almost opposite to the punching direction in the punching area, avoiding the expanding deformation of the hole. Thus, the punching operation barely affects the dimensional accuracy including the thickness and hole diameter of the formed parts. Furthermore, the micro-scaled cups with finer grains have a better surface quality. These findings enhance the understanding of size effect in compound meso/microforming with the combined deep drawing and punching operations.

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“…There is a global trend to minimise the manufactory products' pollution, volume and cost among medical, automotive, and telecommunication sectors, then this requirement encourages to develop the diversity and accuracy of micro-manufacturing products. Besides, the micro forming is one micro manufacturing technology, which is used to produce the high accuracy and comprehensive metal components in cost-effective bulk production [1][2][3]. The micro forming can be separated into two categories according to different bases.…”

Section: Introductionmentioning

confidence: 99%

Effects of TiO2 nanoparticle lubricant on micro deep drawing performance

Pan

Zhang

Jia

et al. 2021

Preprint

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Micro deep drawing is a process to manufacture the thin walled, hollow, box or cup like products at micro scale. Lubricant can affect the products’ quality in micro deep drawing at micro scale due to the decrease of coefficient of friction between the material and tools, it is crucial to enhance the forming efficiency. In this study, 40 µm thickness stainless steel 301 (SUS301) was annealed at 980 ℃ for 2 min under protection of argon gas ambient, and this stainless steel was selected as the specimen material. The micro deep drawing was conducted on a micro press machine under dry and 4% TiO2 nanoparticle lubrication conditions with different forming velocities. The experimental results showed that the micro cup’s profile is affected by changing the forming velocity under the dry and nanoparticle lubrication conditions. Under the dry condition, the surface became rough with the increase of the forming velocity, and then the micro forming efficiency under application of nanoparticle lubricant increases with a rise of drawing velocity.

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Study on size effect affected progressive microforming of conical flanged parts directly using sheet metals

Cited by 36 publications

References 38 publications

Effect of Holding Time on the Extrusion Force and Microstructure Evolution during the Plastic Forming of Ti-6Al-4V Micro-Gears

Effect of Holding Time on the Extrusion Force and Microstructure Evolution during the Plastic Forming of Ti-6Al-4V Micro-Gears

Study on Size-Related Product Quality of Multiscale Central-Punched Cups Fabricated by Compound Forming Directly Using Brass Sheet

Effects of TiO2 nanoparticle lubricant on micro deep drawing performance

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