DIELESS DRAWING PROCESS FOR ELONGATION OF THIN COPPER AND COPPER ALLOY WIRE

A heat assisted superplastic dieless drawing process that requires no dies or tools is applied to the drawing of a Zn-22Al and β titanium superplastic alloy for not only circular but also noncircular microtubes such as square, rectangular and noncircular multi core tubes having square inner and rectangular outer cross sections. As a result, the tendency has been to increase the limiting reduction in area with increasing strain rate sensitivity index m value. We successfully fabricate Zn-22Al alloy, AZ31 magnesium, β titanium circular microtubes with outer diameter of 191μm, 890μm and 180μm, respectively. Furthermore, a noncircular micro tube, which has inner square tubes with a 335μm side, and an outer rectangular tube of 533×923μm were fabricated successfully. During the dieless drawing process, the geometrical similarity law in cross section which the tube is drawn while maintaining its initial shape can be satisfied. The smooth surface can be obtained in case of superplastic dieless drawing process without contact situation with dies and tools. Consequently, it is found that the superplastic dieless drawing is effective for the fabrication of circular and noncircular multicore microtubes.

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Development of High-Performance Copper Alloy Wire on a Continuous Casting and Rolling Process

Materia Japan ◽

10.2320/materia.55.114 ◽

2016 ◽

Vol 55 (3) ◽

pp. 114-116

Author(s):

Hitoshi Nakamoto ◽

Norikazu Ishida ◽

Yoshiaki Hattori ◽

Keiichiro Oishi ◽

Tetsuya Ashida

Keyword(s):

Continuous Casting ◽

Copper Alloy ◽

High Performance ◽

Rolling Process ◽

Alloy Wire

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20304 Fabrication of Metal Micro Tubes Using Multi-pass Dieless Drawing Process

The Proceedings of Conference of Kanto Branch ◽

10.1299/jsmekanto.2013.19.261 ◽

2013 ◽

Vol 2013.19 (0) ◽

pp. 261-262

Author(s):

Tsuyoshi FURUSHIMA ◽

Shusaku FURUSAWA ◽

Kei TSUSHIMA ◽

Yusuke IMAGAWA ◽

Ken-ichi MANABE

Keyword(s):

Drawing Process ◽

Dieless Drawing

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Experimental Setup of Dieless Drawing Process for Magnesium Wire

10.1007/978-3-030-78424-9_5 ◽

2021 ◽

pp. 38-46

Author(s):

M. Braatz ◽

A. Dieckmann ◽

J. Bohlen ◽

N. Ben Khalifa

Keyword(s):

Experimental Setup ◽

Drawing Process ◽

Dieless Drawing

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Transformation of Surface Roughness of Mg Alloy Tubes During Laser Dieless Drawing

Journal of Materials Engineering and Performance ◽

10.1007/s11665-020-05234-6 ◽

2020 ◽

Vol 29 (11) ◽

pp. 7736-7743

Author(s):

Andrij Milenin ◽

Tsuyoshi Furushima ◽

Jiří Němeček

Keyword(s):

Surface Roughness ◽

Longitudinal Strain ◽

Maximum Stress ◽

Experimental Studies ◽

Strain Curve ◽

Surface Roughening ◽

Drawing Process ◽

Stress Strain Curve ◽

Stress Strain ◽

Dieless Drawing

AbstractThe paper investigates the transformation of surface roughness of tubes made from magnesium and magnesium alloys as a function of their longitudinal strain during laser dieless drawing. Experimental studies on three materials (AZ31, MgCa08, and pure Mg) have shown that the dependence of roughness on the longitudinal strain is nonlinear and exhibits a minimum. The proposed explanation for this is that the transformation of surface roughness occurs following two mechanisms. The first mechanism involves stretching of the tube and the decreasing of existing roughness with the increasing elongation. The second mechanism is based on the strain-induced surface roughening phenomenon. This mechanism leads to an increase in roughness with the increasing elongation. To analyze these mechanisms, a numerical model of roughness formation is used. It is experimentally shown that the position of the minimum roughness concerning the tube longitudinal strain is correlated with the stress-strain curve of the material under laser dieless drawing conditions. The obtained results provide a practical way to reduce surface roughness of tubes produced by the laser dieless drawing process. According to the proposed method, to achieve minimum roughness, it is necessary to keep the longitudinal strain under a specific value. This value is close to the strain, which corresponds to the maximum stress on the stress-strain curve of the material for temperature and strain rate, corresponding laser dieless drawing conditions.

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