Technical Brief

Pulsewise-Motion Controlled Stamping for Microtexturing Onto Aluminum Sheet

[+] Author and Article Information
Tatsuhiko Aizawa

Department of Engineering and Design,
Shibaura Institute of Technology,
3-9-14 Shibaura, Minato-City,
Tokyo 108-8548, Japan
e-mail: Taizawa@sic.shibaura-it.ac.jp

Tatsuya Fukuda

Kyoto Institute of Tokai Engineering Service, Co., Ltd.,
499-2 Zaimoku-cho,
Higashi-Tohin Higashi-Hairu,
Kyoto 600-8146, Japan
e-mail: t-fukuda@tes2001.com

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MICRO- AND NANO-MANUFACTURING. Manuscript received August 5, 2014; final manuscript received September 23, 2015; published online December 15, 2015. Assoc. Editor: Gracious Ngaile.

J. Micro Nano-Manuf 4(1), 014502 (Dec 15, 2015) (4 pages) Paper No: JMNM-14-1047; doi: 10.1115/1.4031739 History: Received August 05, 2014; Revised September 23, 2015

High density oxygen plasma-etching was applied to microtexturing onto the diamondlike carbon (DLC) films coated on the die-unit substrates. This mold-die unit with microtextured DLC coating was fixed into a cassette die for computer numerical control (CNC) stamping with the use of precise control both in loading and feeding the sheet materials. In particular, the pulsewise-motion control in stamping was employed to describe the effect of loading and unloading subsequences in the incremental motion on the microtexturing with reference to the normal loading motion. The macroscopic plastic deformation as well as the microscopic metal flow were studied to prove that the pulsewise-motion should be responsible for homogeneous duplication of microcavity patterns into a pure aluminum sheet with high aspect ratio.

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Fig. 1

Two types of multi-DLC-punch AISI-SUS420 die unit

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Fig. 2

SEM image on the microtextured configuration of multi-DLC-punches

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Fig. 3

CNC-stamping system for micro-embossing with automatic feeding and cropping functions

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Fig. 4

Pulsewise-motion control for micro-embossing

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Fig. 5

Variation of the microcavity depth with increasing the applied pressure by the normal loading and pulsewise loading motions, respectively

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Fig. 6

SEM image on the microcavity pattern duplicated onto the aluminum sheet by the normal loading motion together with the laser microscopic measurement

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Fig. 7

SEM image on the deep microcavity patterns duplicated by the pulsewise loading motion



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