Micro-forming and miniature manufacturing systems — development needs and perspectives

Qin, Yi

doi:10.1016/j.jmatprotec.2006.03.212

Cited by 87 publications

(34 citation statements)

References 22 publications

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“…Bending in sheet metal forming is defined as a straining process of metal around a straight axis [1]. During bending, the top section of material may be stretched while the bottom section is compressed.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Investigation of Micro-V-Bending

2017

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Abstract. Bending in sheet metal forming is defined as uniformly straining process around a linear axis. A V-bending process is normally used in sheet metal working due to the tool and process simplicity. The main problem in bending process is a springback occurrence which causes an error in part dimension. In a micro level, the springback angle is difficult to be assessed because of the influence of size effects in all aspects of the system. The springback behavior has been investigated in many previous kinds of research. However, the springback correction is still needed to be studied extensively so that it can be implemented reliably in micro-bending. The purpose of this research is to investigate the influence of punch velocity and holding time to the springback angle. The process is performed to the 0.1 mm thickness of copper foil. The punch velocities are 0.1 mm/s, 1 mm/s, and 10 mm/s. While the variation of holding time, which is set during the bottoming stage, are 7 s, 9 s, and 11 s. The result shows that the punch velocity clearly influences the springback angle. In addition, the holding time during the bottoming stage is a potential factor in springback angle correction.

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Section: Introductionmentioning

confidence: 99%

Preliminary Investigation of Micro-V-Bending

2017

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“…Unlike the macro products in which different functions are attributed to different components, in micro products the number of components is often reduced to a minimum; so single components usually have several functionalities [1]. The development of micro products is influenced by an almost total lack of specific design strategies for these miniature components which limits the designers to the common traditional solutions [16].…”

Section: Introductionmentioning

confidence: 99%

A systematic approach applied in design of a micro heat exchanger

Omidvarnia

Hansen

Sarhadi

2015

Int J Adv Manuf Technol

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The number of products benefiting from micro components in the market is increasing, and consequently, the demand for well-matched tools, equipment and systems with micro features is eventually increasing as well. During the design process of micro products, a number of issues appear which are inherent due to the down scaling or physical phenomena dominating in the micro range but negligible in the macro scale. In fact, some aspects in design for micro manufacturing are considerably different compared to the design procedure taken at the macro level. Identifying the differences between design considerations at micro compared to macro scale, and defining potential guidelines based on them, provides an opportunity to modify the conventional design methodologies towards becoming micro specific. In this paper, the need for a micro-oriented approach for designing micro products which has not been investigated hitherto studied. For this purpose, an additional step named "Rules To Consider" (RTC) is added to the conventional design methodologies. This step is constituted based on the feedbacks gained during analyzing the different iterations of the design. The knowledge obtained during the design process of a micro product can be added to the RTC unit, and this unit becomes enriched progressively in design process of similar micro products and supplemented to the conventional design methodologies to be served as a micro-oriented design methodology. In order to present the application of RTC unit, the design process of a micro heat exchanger is investigated. Manufacturability and functional performance are considered as evaluation criteria, and the lessons learned from each design iteration and evaluation are employed in the subsequent design proposals until an acceptable design is achieved. Thermal performance of the heat exchangers is evaluated using finite element (FE) simulation of the conjugate heat transfer. The design proposals are optimized in terms of geometrical dimensions, and a sensitivity analysis is conducted on the mass flow rate and heat generation power in the heat source. Finally, the designs with higher thermal performance and manufacturability are introduced. The result of the thermal analysis reveals the fact that the presence of the fins and modification of their dimensions as well as the constituent material for fabricating the micro heat exchanger do not significantly improve the thermal performance of the micro heat exchangers. This is an interesting outcome which can result in considerable reduction of the manufacturing costs by simplifying the geometrical design of the heat exchanger. The micro-specific design considerations which are extracted from the design process of the micro heat exchanger are added to the RTC unit and can be applied as guidelines in design process of any other micro heat exchanger. In other words, the current study can provide a useful guideline in design for manufacturing of micro products.

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“…As for microforming, various forming technologies such as micro massive, sheet, and profile forming have been reported (5) . Qin (6) cal Design, ively in recent years and outlined the leading forming and its related systems. Although it has been pplied to blanking and bending for lead frames and c nozzles, etc., microforming technology for micro prod ill immature.…”

Section: Introductionmentioning

confidence: 99%

Single Point Micro Incremental Forming of Miniature Shell Structures

Sekine

Obikawa

2010

JAMDSM

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This study focuses on single point micro incremental forming (SPMIF) applied to the forming of miniature shell products in meso-scale. For this study, a desk-top type of CNC forming machine was newly constructed as an experimental apparatus. A thin aluminum foil with a thickness of 12 μm and a thin round-tip bar with a radius of 100 μm were utilized as a blank and a forming tool, respectively. Some fundamental and complex shell structures were formed for investigating the characteristics of the SPMIF process without using any die and backing plate. The analysis of contact region in forming polygonal pyramids confirmed that fracture on an edge of a polygonal pyramid, which determined the forming limit of SPMIF, was strongly affected by the size of re-contact area. Through the SPMIF process established in this study, complex shell structures were accomplished with elaborate tool paths.

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Micro-forming and miniature manufacturing systems — development needs and perspectives

Cited by 87 publications

References 22 publications

Preliminary Investigation of Micro-V-Bending

Preliminary Investigation of Micro-V-Bending

A systematic approach applied in design of a micro heat exchanger

Single Point Micro Incremental Forming of Miniature Shell Structures

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