State of the art in micro forming and investigations into micro deep drawing

Vollertsen, Frank; Hu, Zhenyu; Niehoff, H. Schulze; Theiler, C.

doi:10.1016/j.jmatprotec.2004.04.266

Cited by 295 publications

(156 citation statements)

References 12 publications

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“…the occurrence of unexpected results concerning the forming force of the forming limit [1]. Since deep drawing is essentially affected by the friction between the work piece and tools [2,3], which is also affected by the size effects [4,5], the tribological size effects in sheet metal forming were investigated in our former work [6,7] and the sizedependent friction functions were acquired. The aim of this work is to realize size dependent FEMsimulation for deep drawing applying the acquired friction functions.…”

Section: Introductionmentioning

confidence: 99%

Modelling of friction with respect to size effects

Vollertsen

2008

Int J Mater Form

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In this paper a size dependent FEM-simulation for sheet metal forming was realized applying the size dependent friction functions acquired from strip drawing tests [1]. The software ABAQUS 6.6.3 was used to simulate the strip drawing tests and deep drawing process in different process dimensions. A 2-dimensional model was built for strip drawing test and a 3-dimensional model was built for deep drawing process. Both processes were experimentally carried out in different dimensions. A constant friction coefficient as well as a friction function, which shows a dependence of friction coefficient on the contact pressure, was applied in the simulation. The simulated punch force vs. punch travel curves were then compared with the experimental curves. A discussion about the difference between these curves with consideration of tribological size effects will be given.

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Section: Introductionmentioning

confidence: 99%

Modelling of friction with respect to size effects

Vollertsen

2008

Int J Mater Form

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“…Experimental investigation of micro deep drawing demonstrate the basic issue of limit drawing ratio that stem from problems of size-effects; in other words, this situation often occur when friction coefficient in micro deep drawing that resulted from applied pressure. In micro deep drawing process due to size-effect and its new concerns, it is compared to macro deep drawing while experiments have shown under the same forming conditions the friction coefficient in micro deep drawing is greater than that in macro deep drawing (F. Vollertsen H. S., 2007; F. Vollertsen Z. H., 2004;Y. Saotome, 2001;M.W.…”

Section: Drawing Structurementioning

confidence: 99%

A Review on Micro Formings

Teyfouri¹,

Ahmadi²,

Lori³

et al. 2015

MAS

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Nowadays, there are increasing demand on micro-systems, micro products/components and micro-devices. Thus, the role of micro manufacturing in all aspects of modern industry is taken for granted. Then, typical processes in micro manufacturing are discussed. Furthermore, one of the most widespread micro-manufacturing processes in deforming processes is micro forming that is presented in this paper. Finally, besides continuing effort in developing micro forming, this paper strives to analyze systematically the key methods of stamping, bending, forging and deep drawing processes and their prominent issues.

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“…The flow stress is found to decrease with the increase of grain size when the foil thickness 09010-p. 3 keeps constant. This indicates that the grain size effect obviously affects the flow stress of this kind of material.…”

Section: Effect Of Grain Size On Materials Propertiesmentioning

confidence: 99%

“…Micro forming, one of the most promising manufacturing approaches, presents attractive advantages of fabricating metallic micro parts efficiently with high productivity, low production cost and good forming quality [1][2][3][4]. With its booming development, the demand on the accuracy of the metallic micro parts is elevating and has stimulated the research on the precision evaluation of micro-formed parts.…”

Section: Introductionmentioning

confidence: 99%

Influence of size effects on material properties and springback behavior of metal foils in micro bending: A review

Liu

Zhao

Qin

et al. 2015

MATEC Web of Conferences

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Abstract. With product miniaturization, the requirement on good forming quality and high dimensional accuracy of micro parts is increasing dramatically. In micro bending process, the springback, a critical factor for the accuracy of micro-bent parts, is significantly affected by size effects. In view of the strong influence of material properties on springback behavior, this paper first reviews the influences of three size-dependent factors on material properties, including foil thickness, grain size and thickness to grain size ratio. Afterwards, the review on the influences of these factors on springback behavior are presented, aiming at enhancing the understanding of relevant size effects and proposing a quantitative analysis approach to evaluate the dimensional accuracy of micro-bent parts.

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State of the art in micro forming and investigations into micro deep drawing

Cited by 295 publications

References 12 publications

Modelling of friction with respect to size effects

Modelling of friction with respect to size effects

A Review on Micro Formings

Influence of size effects on material properties and springback behavior of metal foils in micro bending: A review

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