Study of size effect in micro-extrusion process of pure copper

Chan, Wai Ming; Fu, Ming; Bin, Yang

doi:10.1016/j.matdes.2011.03.045

Cited by 103 publications

(71 citation statements)

References 26 publications

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“…Cold backward extrusion of circular-shaped parts made from copper and aluminium and the design of the tooling have been reported in some studies [1,4,5,7,[9][10][11][12][13][14][15][16][17][18][19][20]. Those covered both experimental and computer modelling investigations.…”

Section: State Of the Artmentioning

confidence: 99%

“…The most papers are concerned with the analysis on the forming of copper in micro-backward can extrusion process [15][16][17][18][19][20]. Ch.…”

Section: State Of the Artmentioning

confidence: 99%

“…Chan et al [18] studied a size effect in microextrusion process of pure copper. The size effect on material deformation behaviours was characterised by grain size, part feature size, forming material size and interfacial condition.…”

Section: State Of the Artmentioning

confidence: 99%

“…The size effect on material deformation behaviours was characterised by grain size, part feature size, forming material size and interfacial condition. Chan et al [18] performed research on micro-forward, backward, combined forward rodbackward can and double cup extrusions.…”

Section: State Of the Artmentioning

confidence: 99%

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The analysis of distributions of effective strain and flow stress in longitudinal sections of cold backward extruded copper cans for different punch-face shapes

Miłek

2017

ITM Web Conf.

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Abstract. The paper presents computer modelling results of researches on cold backward extrusion of copper cans. The calculations were carried out using the commercial code QFORM-2D, based on the Finite Element Method (FEM). The simulation of cold backward extrusion process was performed for different punch-face shapes (flat; flat and conical with conical angle 90 0 and 150 0 ; as well as concave). On the basis of obtained results, the analysis of distributions of effective strain and flow stress in longitudinal sections of cold backward extruded copper cans was conducted.

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Section: State Of the Artmentioning

confidence: 99%

“…The most papers are concerned with the analysis on the forming of copper in micro-backward can extrusion process [15][16][17][18][19][20]. Ch.…”

Section: State Of the Artmentioning

confidence: 99%

Section: State Of the Artmentioning

confidence: 99%

Section: State Of the Artmentioning

confidence: 99%

See 2 more Smart Citations

The analysis of distributions of effective strain and flow stress in longitudinal sections of cold backward extruded copper cans for different punch-face shapes

Miłek

2017

ITM Web Conf.

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“…As the demands of micro metal components constantly increase in the fields of portable products, precision instruments and medical devices, researchers are interested in the development of new nosing processes at micro scale. However, size effects may cause some problems such as nonhomogeneous materials flow and relatively higher friction in micro metal forming [2][3][4][5] that could also exist in the micro nosing process. By increasing the forming temperature and reducing the grain size of the billet, it is possible to improve materials flow and result in uniform deformations [6,7].…”

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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Analysis of the Size Effect on Springback Behavior in Micro‐Scaled U‐Bending Process of Sheet Metals

Wang

Ran

2013

Adv Eng Mater

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In the micro-bending process of sheet metals, springback caused by the considerable elastic recovery during unloading has a significant effect on the dimension precision of micro-bent sheet metal parts. In design of micro-bent parts and bending process, this phenomenon needs to be considered. However, the traditional well-established knowledge for analysis of macro-scaled sheet metal bending processes may not be very suitable and efficient in analysis of micro-scaled sheet metal bending due to the geometry and microstructure size effects in the process. To explore the unloading springback of sheet metals after microbending, the experimental studies on the interactive influence of a few significant parameters including sheet thickness, grain size, and punch radius on the springback in micro U-bending process of copper alloy sheets were conducted. An appropriate constitutive model based on the surface layer model, which is widely used in micro-scaled forming processes, is proposed to predict the amount of springback and the relationship among these parameters is further established. The research shows that the springback angle generally increases with the decreasing sheet thickness, and for different punch radii, the springback angle has different variation trends for the sheet metals with different grain sizes. The developed analysis method is verified via the comparison of the calculated stress-strain curves with the tensile test results of three kinds of copper alloy sheets. The findings on how the size effects affect the springback behaviors of in micro-bending process are validated by the experimental results, finite element simulation, and the comparison in-between.

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Study of size effect in micro-extrusion process of pure copper

Cited by 103 publications

References 26 publications

The analysis of distributions of effective strain and flow stress in longitudinal sections of cold backward extruded copper cans for different punch-face shapes

The analysis of distributions of effective strain and flow stress in longitudinal sections of cold backward extruded copper cans for different punch-face shapes

Study on micro nosing process assisted by ultrasonic vibration

Analysis of the Size Effect on Springback Behavior in Micro‐Scaled U‐Bending Process of Sheet Metals

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