scholarly journals Study on size effects in micro deep drawing of stainless steel foil

2021 ◽  
Vol 2020 (1) ◽  
pp. 012040
Author(s):  
S N Yuan ◽  
H B Xie ◽  
F H Jia ◽  
H Wu ◽  
D Pan ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Size Effects ◽  
Deep Drawing ◽  
Stainless Steel Foil ◽  
Micro Deep Drawing

scholarly journals Experimental Investigation on Micro Deep Drawing of Stainless Steel Foils with Different Microstructural Characteristics

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Jingwei Zhao ◽  
Tao Wang ◽  
Fanghui Jia ◽  
Zhou Li ◽  
Cunlong Zhou ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Deep Drawing ◽  
Annealing Temperature ◽  
Localized Deformation ◽  
Microstructural Characteristics ◽  
Height Profile ◽  
Annealing Temperatures ◽  
Micro Deep Drawing ◽  
Profile Distribution

AbstractIn the present work, austenitic stainless steel (ASS) 304 foils with a thickness of 50 µm were first annealed at temperatures ranging from 700 to 1100 ℃ for 1 h to obtain different microstructural characteristics. Then the effects of microstructural characteristics on the formability of ASS 304 foils and the quality of drawn cups using micro deep drawing (MDD) were studied, and the mechanism involved was discussed. The results show that the as-received ASS 304 foil has a poor formability and cannot be used to form a cup using MDD. Serious wrinkling problem occurs on the drawn cup, and the height profile distribution on the mouth and the symmetry of the drawn cup is quite non-uniform when the annealing temperature is 700 ℃. At annealing temperatures of 900 and 950 ℃, the drawn cups are both characterized with very few wrinkles, and the distribution of height profile, symmetry and mouth thickness are uniform on the mouths of the drawn cups. The wrinkling becomes increasingly significant with a further increase of annealing temperature from 950 to 1100 ℃. The optimal annealing temperatures obtained in this study are 900 and 950 ℃ for reducing the generation of wrinkling, and therefore improving the quality of drawn cups. With non-optimized microstructure, the distribution of the compressive stress in the circumferential direction of the drawn foils becomes inhomogeneous, which is thought to be the cause of the occurrence of localized deformation till wrinkling during MDD.

Mechanical and Laser Micro Deep Drawing

2007 ◽  
Vol 344 ◽  
pp. 799-806 ◽  
Author(s):  
H. Schulze Niehoff ◽  
Zhen Yu Hu ◽  
Frank Vollertsen
Keyword(s):  
Shock Wave ◽  
Size Effects ◽  
Deep Drawing ◽  
Thermal Stresses ◽  
Laser Forming ◽  
Drawing Process ◽  
Deep Drawing Process ◽  
Plasma Generation ◽  
Micro Deep Drawing ◽  
Explosive Forming

Mechanical micro deep drawing becomes a more and more industrial relevant process. But due to size effects new challenges are involved in this process compared to macro deep drawing. The size effects cause an increase of friction and thus hinder the material flow. The change of friction in mechanical micro deep drawing is subject of the presented investigations in this paper. Additionally to this, a new non-mechanical micro deep drawing process is presented, whereby a laser beam acts as a punch. This new laser deep drawing process is based on a totally different mechanism compared to thermal laser forming, e.g. forming by laser induced thermal stresses: The laser produces a pulse with an extremely high power density, which causes plasma generation at the target and thus a shock wave. The shock wave can be used as in explosive forming, but is smaller and easier to generate. Recent investigations showed that using this technology laser deep drawing is possible with a sheet metal out of Al 99.5 and a thickness of 50 'm. The deep drawing process was carried out with a die diameter of 4 mm and shows promising results.

Using micro deep drawing with ironing stages to form stainless steel 304 micro cups

2013 ◽  
Vol 15 (2) ◽  
pp. 298-305 ◽  
Author(s):  
Jenn-Terng Gau ◽  
Sujith Teegala ◽  
Kun-Min Huang ◽  
Tun-Jen Hsiao ◽  
Bor-Tsuen Lin
Keyword(s):  
Stainless Steel ◽  
Deep Drawing ◽  
Micro Deep Drawing ◽  
Stainless Steel 304

Study of Size Effects on Deformation Behavior and Formability in Micro Metal Forming of Ti Foil

2012 ◽  
Author(s):  
Jie Xu ◽  
Bin Guo ◽  
Debin Shan ◽  
Baishun Li
Keyword(s):  
Grain Size ◽  
Flow Stress ◽  
Size Effects ◽  
Deep Drawing ◽  
Metal Forming ◽  
Deformation Behavior ◽  
Foil Thickness ◽  
Micro Scale ◽  
Micro Deep Drawing ◽  
Micro Parts

Micro forming technology becomes a promising approach to fabricate micro-parts due to its advantages of high productivity, low production cost, good product quality and mechanical properties, and near net or net shape characteristics. However, the deformation behaviors of material change and the so-called size effect occurs when the part dimension is decreased to micro-scale. To analyze the quality of micro-parts, the material flow stress, anisotropy, ductility and formability in micro-scale need to be considered. In the paper, micro tensile and micro deep drawing tests of Ti foils were used and the size effects on deformation behavior and formability of micro sheet metal forming were studied. The results show that the flow stress of Ti foils is related with foil thickness and grain size. The fracture behaviors also have been changed from shear dimple to slip separation with the decrease of foil thickness. The formability of micro deep drawing becomes worse with the decrease of micro cup dimension and the increase of grain size.

119 Deep Drawing of Stainless-Steel Foil and Nickel Foil

2001 ◽  
Vol 2001 (0) ◽  
pp. 37-38
Author(s):  
Yasuo MARUMO ◽  
Hiroyuki SAIKI ◽  
Akira ONOUE
Keyword(s):  
Stainless Steel ◽  
Deep Drawing ◽  
Nickel Foil ◽  
Stainless Steel Foil

Effects of TiO2 nanoparticle lubricant on micro deep drawing performance

2021 ◽  
Author(s):  
Di Pan ◽  
Guangqing Zhang ◽  
Fanghui Jia ◽  
Hamidreza Kamali ◽  
Yao Lu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Deep Drawing ◽  
Micro Forming ◽  
Argon Gas ◽  
Micro Scale ◽  
Micro Deep Drawing ◽  
Specimen Material ◽  
Forming Efficiency ◽  
Thin Walled ◽  
Lubrication Conditions

Abstract Micro deep drawing is a process to manufacture the thin walled, hollow, box or cup like products at micro scale. Lubricant can affect the products’ quality in micro deep drawing at micro scale due to the decrease of coefficient of friction between the material and tools, it is crucial to enhance the forming efficiency. In this study, 40 µm thickness stainless steel 301 (SUS301) was annealed at 980 ℃ for 2 min under protection of argon gas ambient, and this stainless steel was selected as the specimen material. The micro deep drawing was conducted on a micro press machine under dry and 4% TiO2 nanoparticle lubrication conditions with different forming velocities. The experimental results showed that the micro cup’s profile is affected by changing the forming velocity under the dry and nanoparticle lubrication conditions. Under the dry condition, the surface became rough with the increase of the forming velocity, and then the micro forming efficiency under application of nanoparticle lubricant increases with a rise of drawing velocity.

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