scholarly journals Effective Temperature Distribution and Drawing Speed Control for Stable Dieless Drawing Process of Metal Tubes

2009 ◽  
Vol 3 (2) ◽  
pp. 236-246 ◽  
Author(s):  
Tsuyoshi FURUSHIMA ◽  
Syuhei HIROSE ◽  
Ken-ichi MANABE
Keyword(s):  
Temperature Distribution ◽  
Effective Temperature ◽  
Speed Control ◽  
Drawing Process ◽  
Drawing Speed ◽  
Dieless Drawing

Study on Mathematical Model of Dieless Drawing Speed Control for Variable Section Pipes

2013 ◽  
Vol 373-375 ◽  
pp. 2034-2037
Author(s):  
Hong Yan Xia ◽  
Qing Bian ◽  
Di Wu
Keyword(s):  
Mathematical Model ◽  
Metal Forming ◽  
Speed Control ◽  
Drawing Process ◽  
Drawing Speed ◽  
Dieless Drawing ◽  
Variable Section ◽  
Microcomputer Control ◽  
Flexible Metal ◽  
The Mathematical Model

Dieless drawing, as a flexible metal forming method, could form pipes with arbitrary variable section. In order to control the shape and dimensions accurately, based on the analysis of deformation mechanism of arbitrary variable section pipes via dieless drawing process, the calculation method of dieless drawing speed during pipe forming is proposed theoretically,Furthermore, mathematical model of dieless drawing speed control is established by using piecewise polynomial to approach continuous speed curve. The study provide the basis for the dieless drawing speed microcomputer control system. The results of experimental investigation showed that the mathematical model indicates variation of dieless drawing speed quite well, and it is available to schedule the speeds for arbitrary variable section pipes dieless drawing.

Development of Superplastic Dieless Drawing Apparatus for 3Y-TZP Zirconia Ceramic Tube

2016 ◽  
Vol 838-839 ◽  
pp. 597-602 ◽  
Author(s):  
Tsuyoshi Furushima ◽  
Yutaro Hirose ◽  
Kazuo Tada ◽  
Ken-Ichi Manabe
Keyword(s):  
Tensile Deformation ◽  
Local Heating ◽  
Zirconia Ceramic ◽  
Outer Diameter ◽  
Drawing Process ◽  
Ceramic Tube ◽  
Drawing Speed ◽  
Dieless Drawing ◽  
Feeding Speed ◽  
Reduction In Area

A novel superplastic dieless drawing technique with local heating and tensile deformation has been focused on for fabrication of zirconia ceramic tube. In this study, 3Y-TZP zirconia ceramic tube with outer diameter of 6mm and inner diameter of 4mm as a superplastic material is used experimentally. An apparatus of superplastic dieless drawing with rotary stage for circumferential uniform heating and acetylene burner for high temperature of 1700°C is developed. The superplastiac dieless drawing experiment is carried out to investigate the effect of the ratio of drawing speed to feeding speed on the flexible controllability of diameter after drawing process. As a result, the reduction in area after drawing process can be controlled by the ratio of drawing speed to feeding speed. In addition, a maximum reduction in area of 79.2% can be realized in this process. Consequently, the validity of developed apparatus of superplastic dieless drawing for Zirconia ceramic tube can be demonstrated.

Thermal Modeling of the Optical Fiber Drawing Process

1989 ◽  
Vol 172 ◽  
Author(s):  
Haris Papamichael ◽  
Ioannis N. Miaoulis
Keyword(s):  
Temperature Distribution ◽  
Optical Fibers ◽  
Drawing Process ◽  
Thick Fiber ◽  
Fiber Analysis ◽  
Drawing Speed ◽  
Optical Fiber Drawing ◽  
Axial Heat ◽  
Dimensionless Heat ◽  
General Method

AbstractA new general method for determining the local dimensionless heat convection coefficient (Nusselt number) and the temperature distribution in thin and thick optical fibers during the drawing process was developed. The axial heat transfer by conduction was included in the analysis as an addition to previously developed models. The developed model can serve as a general thermal solver for thin (<200μm in dia.) and thick (>200μm in dia.) fibers. The general method was compared with existing methods and it was found to be in agreement in the case of thin fiber analysis but not in the case of thick fiber analysis, where axial conduction effects are significant. Results of a parametric study to examine the effects of diameter of fiber and drawing speed on the temperature distribution are presented.

Laser Dieless Drawing Process for Metal Micro-Tubes

2010 ◽  
Vol 443 ◽  
pp. 699-704 ◽  
Author(s):  
Tsuyoshi Furushima ◽  
Yuta Noda ◽  
Kenichi Manabe
Keyword(s):  
Local Heating ◽  
High Accuracy ◽  
Outer Diameter ◽  
Drawing Process ◽  
Heating Source ◽  
Drawing Speed ◽  
Dieless Drawing ◽  
Scale Down ◽  
Drawing Technique ◽  
Micro Tools

A drawing process using tools such as dies, plugs and mandrels has been conventionally applied as a means of miniaturizing tubes. However, it is not easy to scale down the conventional process to micro sizes for many reasons related to the tools used in the process. It is difficult to fabricate micro tools with high accuracy, and to insert a plug or a mandrel into a fine tube. Thus, the development of new drawing technologies for the fabrication of micro-tubes without the need for tools such as dies, plugs and mandrels is necessary. A laser dieless drawing technique with local heating using a laser as the heating source has been focused on for the fabrication of micro-tubes. In this study, a dieless drawing with a semiconductor laser setup is designed and developed. A tube of stainless steel, SUS304, with an outer diameter of 0.52mm and thickness of 0.1mm is used in the experiments. A laser dieless drawing experiment is carried out to investigate the effect of the laser power and drawing speed on the drawing limit. Finally, the effectiveness of laser dieless drawing process is discussed.

Heat Assisted Dieless Drawing Process of Superplastic Metal Microtubes - From Zn22Al to β Titanium Alloys

2016 ◽  
Vol 838-839 ◽  
pp. 459-467 ◽  
Author(s):  
Tsuyoshi Furushima ◽  
Ken-Ichi Manabe
Keyword(s):  
Cross Sections ◽  
Rate Sensitivity ◽  
Sensitivity Index ◽  
Outer Diameter ◽  
Drawing Process ◽  
Initial Shape ◽  
Dieless Drawing ◽  
Superplastic Alloy ◽  
Strain Rate Sensitivity Index ◽  
Contact Situation

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.

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

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

Experimental Setup of Dieless Drawing Process for Magnesium Wire

2021 ◽  
pp. 38-46
Author(s):  
M. Braatz ◽  
A. Dieckmann ◽  
J. Bohlen ◽  
N. Ben Khalifa
Keyword(s):  
Experimental Setup ◽  
Drawing Process ◽  
Dieless Drawing

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

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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