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

Gau, Jenn Terng; Teegala, Sujith; Huang, Kun Min; Hsiao, Tun Jen; Lin, Bor Tsuen

doi:10.1016/j.jmapro.2013.01.009

Cited by 42 publications

(15 citation statements)

References 8 publications

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“…In fact, the maximum aspect ratio which can be achieved for the blank diameter of 10mm used in the current investigation is 1.25, where no enough material remaining at the flange region to produce a free-earing cup. It is reported in a previous work [19] that it cannot produce SS 304 cups at micro scale with high aspect ratio; that is >1, through a conventional deep drawing process by using a single forming die. Thus, the aspect ratio of 1.25 achieved by adopting the proposed technique through a single deep drawing process using a rubber die indicates that this technique is noticeably more efficient than the conventional deep drawing in terms of manufacture cost and production time.…”

Section: Initial Gapmentioning

confidence: 98%

Experimental and numerical investigation on micro deep drawing process of stainless steel 304 foil using flexible tools

Irthiea

Green

Hashim

et al. 2014

International Journal of Machine Tools and Manufacture

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Section: Initial Gapmentioning

confidence: 98%

Experimental and numerical investigation on micro deep drawing process of stainless steel 304 foil using flexible tools

Irthiea

Green

Hashim

et al. 2014

International Journal of Machine Tools and Manufacture

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“…Meanwhile, in bending process, Fujimoto et al [5] treatment of the punch with an ion beam irradiation and diamond-like carbon (DLC) coating. Another die manufacturing was also explained by Gau et al [6] in micro-deep drawing tool.…”

Section: Introductionmentioning

confidence: 87%

Fabrication of punch and die of micro-blanking tool

Mahmudah

Kiswanto

Priadi

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Saotome et al showed that the process window decreases with increasing ratio between the punch diameter and sheet thickness when thin foils are used [Sao90]. In preparation for the deep drawing process, Gau et al expanded the process window for forming micro cups with cup height to outer diameter ratios by annealing stainless steel 304 sheets at temperatures not less than 900°C for more than 3 min [Gau13]. In 2014, a novel technique in micro sheet metal forming was presented by Irthiea et al [Irt14].…”

Section: Introductionmentioning

confidence: 99%

Micro Forming Processes

Kuhfuß¹,

Schattmann

Jahn

et al. 2019

Lecture Notes in Production Engineering

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The projects of this chapter describe micro forming processes that are studied as single processes but can also be combined as process chains. Proven examples are material accumulation and succeeding rotary swaging, or rotary swaging and extrusion.Micro forming differs from macro forming due to scaling effects, which can mean both challenges and benefits. Problems may arise from the handling of fragile parts or adhesive forces between the micro parts or friction effects.Benefits from scaling effects are made use of in the project "Generation of functional parts of a component by laser-based free-form heading". The aim is a material accumulation that is generated from short duration laser melting. This material accumulation gives the basis for succeeding cold forming operations. The first powerful application for the new technology was upsetting. In the macro range, upset ratios of about 2.3 are achievable, but this is reduced in the micro scale due to earlier buckling of the components. In the micro scale, where cohesive forces can exceed the gravitational force, the molten material forms a droplet that remains adhered to the rod. Thus, upset ratios of up to 500 were reached. The process development was accompanied by a mathematical model and allows for a deep insight into the thermodynamics of laser-induced material accumulation in the micro range.The laser molten material accumulation could, for example, be further processed by micro rotary swaging. Though rotary swaging has been known in the macro range for a long time and is nowadays an intensively used process in the automotive industry to produce lightweight components from tubular blanks, there are only a few scientific works that have addressed material characteristics like the work hardening or residual stress that are linked to the process and machine parameters and the resulting material flow. Due to micro scale specifics that follow from the kinematics, i.e. relatively smaller stiffness against part buckling and wider tool gaps in the opened state, the feed rates achievable cannot compete with high throughput technologies that produce 500 parts per minute and more. One major aim of the project "Rotary swaging of micro parts" was to increase the productivity for the main process variants, namely infeed and plunge rotary swaging. This demanded also process modeling to understand how parameter variations like friction between tools and the work in the different zones of the swaging tools affect the process.From the modeling and simulation, separate process variations were deduced and investigated. For infeed swaging, a special workpiece clamping allows for compensation of the pushback force, which results in a 10-fold increase of the maximum feed rate. For plunge rotary swaging, an approach was tested to close the tools gaps during opening using elastic intermediate elements that encapsule the workpiece against the forming dies and enable a 4-fold increase of the radial feed rate. 28 B. Kuhfuss et al.Micro rotary swaging could become a base technology ...

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

Cited by 42 publications

References 8 publications

Experimental and numerical investigation on micro deep drawing process of stainless steel 304 foil using flexible tools

Experimental and numerical investigation on micro deep drawing process of stainless steel 304 foil using flexible tools

Fabrication of punch and die of micro-blanking tool

Micro Forming Processes

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