Microbulging extrusion of aluminum alloy to fabricate micro/meso features for heat pipes

Ding, Sha; Jin, Sun

doi:10.1007/s00170-016-8384-z

Cited by 7 publications

(2 citation statements)

References 39 publications

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“…In order to quantify the inhomogeneity of material ow at the exit of the MHP pro le, referring to the previous studies [19,21], the standard deviation of velocity (SDV) value for the PEV is adopted, and expressed as follows:…”

Section: Forming Mechanism Of Micro Groovesmentioning

confidence: 99%

“…In addition, even though material microstructure is also highly essential for heat pipe, the known research on micro-extrusion of heat pipe mainly focuses on geometric shape control. Ding et al [19] presented a porthole die with a reasonable bulging angle of 16° to manufacture 6063 aluminum alloy double-wing and double-hole heat pipe with Ω shape groove, which improved the problem of die failure caused by stress concentration of the extrusion die at a large extrusion ratio. However, it is much more di cult for the micro-extrusion of miniature heat pipe (MHP) with micro grooves in aluminum alloy, and research on manufacturing has not been seen yet.…”

Section: Introductionmentioning

confidence: 99%

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Micro-extrusion process and microstructure evolution of miniature heat pipe in 6063 aluminum alloy

Liu

Zhang

et al. 2022

Int J Adv Manuf Technol

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Micro-extrusion process of miniature heat pipe with axial micro grooves is particularly di cult due to ultra-large extrusion ratio and complex cross-sectional shape. In this study, the shape control of a miniature heat pipe in 6063 aluminum alloy with boundary dimension of 5×4 mm has been successfully realized during micro-extrusion. Micro-extrusion process and microstructure evolution of the miniature heat pipe were investigated by the combination of nite element (FE) analysis with experiments. The results show that material ow deformation behavior during micro-extrusion is highly affected by size effect, and lower ram speed is conductive to forming integrity, dimension accuracy and surface quality of the heat pipe pro le. The primary mechanism for micro-extrusion failure of micro-grooves is severely more uneven material ow between the micro rib and base region at higher ram speed, which is caused by size effect and results in shear deformation and even fractures of micro rib. Further research shows that, compared to the extrusion using as-cast billets, much coarser grains were obtained after microextrusion using as-extruded billets at an ultra-large extrusion ratio of 205. Besides that, the entirely different texture components after extrusion were obtained instead of the typical < 100 > //ED or < 111 > //ED ber texture components. These atypical texture components can be regarded as texture deviating from ideal texture by a certain angle (15° or 20°) along φ axis or φ 1 axis. from ideal texture by a certain angle (15° or 20°) along φ axis or φ 1 axis.

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Section: Forming Mechanism Of Micro Groovesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%