Microforming of Lightweight Metals in Warm Conditions

Arentoft, Mogens; Bruschi, Stefania; Ghiotti, Andrea; Paldan, Nikolas Aulin; Holstein, Jakob Viggo

doi:10.1007/s12289-008-0088-y

Cited by 11 publications

(6 citation statements)

References 6 publications

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“…Concluding on data, the flow stress is lowered approximately 70%, depending on the alloy. Further, the effect of heating is significant, compared to the similar results for Magnesium [2]. The data depicted in Figure 2 indicates a reduction in flow stress gained by going from 20 ºC to 300 ºC, the effect is most predominant for the G2 and G4 alloys.…”

Section: Temperature Dependancementioning

confidence: 67%

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Micro forming of titanium

Eriksen

Arentoft²,

Paldan³

et al. 2009

Int J Mater Form

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Titanium is a popular material for medico components, primarily due to its excellent properties as regards strength, resistance to corrosion and biocompatibility. The disadvantages are mainly the low formability at room temperature and the material cost. As an alternative to conventional machining, the component can be plastically formed by a number of warm forming operations. Commercial pure titanium, grade 1, 2 and 4, is tested in 4 dimensions to investigate the size effect as function of temperature and strain rate. From these tests, a heat treatment procedure is derived and reliable data for a numerical model is acquired. The concept is validated by forming a dental implant. Due to the high aspect ratio of the tool inserts, a segmented die design is proposed. A two-step process design with pre-stressed die inserts is realized; following from the high yield strength of the titanium material that causes internal pressures above 2500 MPa under forging. The design phase is supported by numerical modeling.

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Section: Temperature Dependancementioning

confidence: 67%

“…Past work has proven that it is feasible to forge mircocomponents instead of using traditional cutting applications [1,2,3]. By forging a large number of components, the production time and material cost are reduced.…”

Section: Introductionmentioning

confidence: 99%

Micro forming of titanium

Eriksen

Arentoft²,

Paldan³

et al. 2009

Int J Mater Form

Self Cite

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show abstract

“…variations in material and mechanical properties as the processes are miniaturised to micro scale, which have been reported extensively [2][3][4][5][6]. When the microstructure is kept as a constant, only a few grains are involved within the micro scale components through the dimension of interest, and thus there are only a few grains located in the deformation zone.…”

Section: Introductionmentioning

confidence: 99%

Influences of temperature and grain size on the material deformability in microforming process

Jiang

Zhao

et al. 2016

Int J Mater Form

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This paper investigated the influences of temperature and grain size on the deformability of pure copper in micro compression process. Based on the dislocation theory, a constitutive model was proposed taking into account the influences of forming temperature, Hall-Petch relationship and surface layer model. Vacuum heat treatment was employed to obtain various grain sizes of cylindrical workpieces, and then laser heating method was applied to heat workpieces during microforming process. Finite element (FE) simulation was also performed, with simulated values agreed well with the experimental results in terms of metal flow stress. Both the FE simulated and experimental results indicate that forming temperature and grain size have a significant influence on the accuracy of the produced product shape and metal flow behaviour in microforming due to the inhomogeneity within the deformed material. The mechanical behaviour of the material is found to be more sensitive to forming temperature when the workpieces are constituted of fine grains. experimental results indicate that forming temperature and grain size have a significant influence on the accuracy of the produced product shape and metal flow behaviour in microforming due to the inhomogeneity within the deformed material. The mechanical behaviour of the material is found to be more sensitive to forming temperature when the workpieces are constituted of fine grains.

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“…However, in microforming, the heat capacity of the blank is decreasing significantly with decreasing size, which results in high heat dissipation of the blank during the forming process. Thus, an indirect heating method by heating the die (tool‐heating) is usually used in heat‐assisted microforming . Even though the heat dissipation of the blank is controlled to be less during forming, tool‐heating method is with high energy consumption and low heating efficiency.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Temperature Distribution and Its Optimization for Thin Foils in Micro Deep Drawing Assisted by Resistance Heating

Zheng

Shimizu

Yang

2015

steel research int.

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Application of resistance heating to micro metal forming process can achieve not only the improvement of the material formability, but also the less consumption of energy. In this study, finite element (FE) models for the numerical analysis of micro deep drawing process assisted by resistance heating are developed. Coupled thermal-electrical procedure and coupled thermal-displacement dynamic explicit procedure are conducted for the analysis of temperature distribution and material deformation, respectively. The results show that the temperature distribution of the blank is influenced not only by the difference in electrical current density, but also by the heat transfer from the material to the tools. The results of temperature distribution obtained from the simulation show the same tendency with the experiments, which confirms the feasibility of the developed FE models. In addition, to obtain uniform temperature distribution of the blank, the process parameters are optimized. It is demonstrated that the material formability can be improved by obtaining more uniform temperature distribution of the blank.

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Microforming of Lightweight Metals in Warm Conditions

Cited by 11 publications

References 6 publications

Micro forming of titanium

Micro forming of titanium

Influences of temperature and grain size on the material deformability in microforming process

Numerical Analysis of Temperature Distribution and Its Optimization for Thin Foils in Micro Deep Drawing Assisted by Resistance Heating

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