Fabrication of micro-billet by sheet extrusion

Hirota, Kenji

doi:10.1016/j.jmatprotec.2007.03.024

Cited by 57 publications

(47 citation statements)

References 3 publications

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“…Currently, there are two alternative approaches proposed to substitute micromachining process. One is to prepare microbillets via simple shearing of metal wire [31], and the other is to form microparts by directly using sheet metal [106]. For the first one, it is difficult to control the quality of the fracture surfaces of the billet.…”

Section: Micro Progressive Formingmentioning

confidence: 99%

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Microforming Processes

Chan

2014

Springer Series in Advanced Manufacturing

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Section: Micro Progressive Formingmentioning

confidence: 99%

“…To explore and develop the above-mentioned process, Hirota [106] prepared the microbillet via extruding the sheet metal in thickness direction. Atsushi et al [107] further developed this process to fabricate bulk mesoparts by directly using sheet metal via multi-stage shearing and extrusion.…”

Section: Micro Progressive Formingmentioning

confidence: 99%

Microforming Processes

Chan

2014

Springer Series in Advanced Manufacturing

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“…The FEM simulation of 70% punch penetrate on sheet metal surface was investigated effect of tool radii on extrusion end, which were defect prevent and also usually used for sheet metal extrusion in past research (Hirota, 2007). The experiment result showed an occurrence of extrude sinking as shown in Fig.…”

Section: End Of Extrusion Rodmentioning

confidence: 99%

Die Radius Affecting Sheet Metal Extrusion Quality for Fine Blanking Process

Suriyapha¹

2010

American Journal of Engineering and Applied Sciences

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Problem statement: Sheet metal extrusion is a process in which the punch penetrates one surface of the sheet metal material to cause it to extrude and flow toward the outlet of the die. Therefore, the process can invent different thickness of sheet metal work piece. From these advantages on the sheet metal extrusion, nowadays, it is generally used in many manufacturing of industrial elements fields. The Sheet Metal Extrusions in Fine Blanking (SME-FB) advantages, over a conventional extrusion, are possible due to a blank holder force, a counterpunch force and a large die radius. However, the selection on those parameter values affects on the material flow and the surface quality on the extrusion parts also. Namely, it causes the crack surface and shrinkage failure which are the general problems in the SME-FB. Approach: Objective of this research was to study the effect of die radius on the SME-FB surface which investigated the formation of the failure defection with respect to the several die radiuses by using the Finite Element Method (FEM). Results: From the results, it indicated that applying the small die radius caused the material flow difficult resulting in the decreasing of smooth surface. Vice versa, in the case of large die radius, the material flow easy is resulting in the increasing of smooth surface. Conclusion: The FEM simulation results of a larger die radius will cause the residual stress at work piece.

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“…Whereas the second approach can address the common issues such as the adhesive forces induced by surface tension, van der Waals-force, and the electrostatic interaction between workpiece and handling tools in microforming process. To explore this process, Hirota [3] extruded micro-billet via pressing the sheet material in thickness direction. Fu and Chan [4,5] further examined the feasibility of this process to fabricate the meso-and micro-scaled parts by directly using sheet metal, and identified its characteristics via scaling down the part size and using the materials with different grain sizes.…”

Section: Introductionmentioning

confidence: 99%

Review on progressive microforming of bulk metal parts directly using sheet metals (Keynote Paper)

Meng

2015

MATEC Web of Conferences

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Abstract. Due to the ubiquitous trend of product miniaturization, energy saving and weight reduction, micro/meso-scale parts have been widely used in many industrial clusters. Micromanufacturing processes for production of such micro/meso-scale parts are thus critically needed. Microforming, as one of these micro manufacturing processes, is a promising process and thus got many explorations and researches. Compared with the research on size effect affected deformation behaviours, less attention has been paid to the process development for mass production of micro-parts. The product quality and fabrication productivity of micro-parts depend on the involved process chain. To address the difficulty in handling and transporting of the micro-sized workpiece, development of a progressive microforming process for directly fabricating bulk micro-parts using sheet metals seems quite promising as it avoids or facilitates billet handling, transportation, positioning, and ejection in the process chain. In this paper, an intensive review on the latest development of progressive microforming technologies is presented. First of all, the paper summarizes the characteristic of progressive microforming directly using sheet metal. The size effect-affected deformation behaviour and the dimensional accuracy, deformation load, ductile fracture, and the surface finish of the microformed parts by progressive microforming using sheet metals are then presented. Finally, some research issues from the implementation of mass production perspective are also discussed.

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Fabrication of micro-billet by sheet extrusion

Cited by 57 publications

References 3 publications

Microforming Processes

Microforming Processes

Die Radius Affecting Sheet Metal Extrusion Quality for Fine Blanking Process

Review on progressive microforming of bulk metal parts directly using sheet metals (Keynote Paper)

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