Improvement of Die-Roll Quality in Compound Fine-Blanking Forming Process

Huang, Xin; Xiang, Hua; Zhuang, Xin; Zhao, Zhen

doi:10.4028/www.scientific.net/amr.337.236

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…From the various reports thus far, it is known that the stress distribution within a material is related to the material flow in the processing. For example, Huang et al have shown the effect of the tool clearance (either positive or negative) on the die roll during blanking [17], and Thipprakmas et al have clarified the mechanism of fracture during FB, in which an extremely small but positive tool clearance was used [18]. However, they have not yet clarified the fracture mechanism, in which a positive clearance and a negative clearance might cause different fracture behaviors.…”

Section: Fem Simulation Results and Discussionmentioning

confidence: 99%

Elucidation of Shearing Mechanism of Finish-type FB and Extrusion-type FB for Thin Foil of JIS SUS304 by Numerical and EBSD Analyses

et al. 2019

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A numerical analysis using FE (finite element) analysis was performed to clarify the shearing mechanism in the process of extrusion-type fine blanking (FB) for a thin foil of JIS SUS304 in this study. Extrusion-type FB, in which a negative clearance between the punch and the die has been developed and investigated experimentally to improve the quality of the sheared surface in the blanking of thin foils. The resultant sheared surface for extrusion-type FB indicated an almost completely sheared surface, and the fracture portion on the sheared surface was much smaller than that in conventional FB, the so-called finish-type FB. The material flow and fracture criteria in extrusion-type FB were analyzed in comparison with those in finish-type FB. The differences in material flow and so-called critical fracture value were verified for the two processes. The principal stress near the shearing surface has mostly compressive components in extrusion-type FB due to its negative clearance, and the critical fracture value was also less than that in finish-type FB, in which the principal stress near the shearing surface has mostly tensile components. Furthermore, SEM observation with EBSD (electron back-scatter diffraction) analysis of the shearing surface was performed to verify the phenomena. Reductions in deformation-induced crystal orientation rotation and martensite transformation in extrusion-type FB were confirmed in comparison with those in finish-type FB from the analysis results.

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Section: Fem Simulation Results and Discussionmentioning

confidence: 99%

Elucidation of Shearing Mechanism of Finish-type FB and Extrusion-type FB for Thin Foil of JIS SUS304 by Numerical and EBSD Analyses

et al. 2019

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“…Tanaka et al [8] reported that a higher blank holding force and counterforce, a higher V-ring, and smaller clearance could be applied to reduce the die roll. Huang et al [9] simulated fine blanking using different punch-die clearance levels; the die roll quality was improved by controlling the material flow in the local area. Luo et al [10] developed a two-step compound fine blanking method that could significantly reduce the die roll of gear teeth.…”

Section: Introductionmentioning

confidence: 99%

Reduction of die roll height in duplex gears through a sheet-bulk metal forming method

et al. 2019

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In the existing shearing processes for fabricating parts such as duplex gears, die roll is difficult to avoid. Accordingly, a method based on sheet-bulk metal forming for fabricating a duplex gear with extremely small die roll in one stroke is proposed in the current work. The process could be divided into three stages according to the forming features: upsetting and shearing stage, lateral extrusion stage, and local filling stage. The die roll appeared in the shearing stage, which could be reduced in the subsequent extrusion and local filling stages. To reveal the underground mechanism, material flows under two situations, as a key factor to influence the forming quality, were compared and investigated. The results revealed that by controlling material flow, one could avoid the defects and reduce the die roll.

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Development of a shaving die design for reducing rollover

Sontamino

Thipprakmas

2019

Int J Adv Manuf Technol

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Improvement of Die-Roll Quality in Compound Fine-Blanking Forming Process

Cited by 6 publications

References 7 publications

Elucidation of Shearing Mechanism of Finish-type FB and Extrusion-type FB for Thin Foil of JIS SUS304 by Numerical and EBSD Analyses

Elucidation of Shearing Mechanism of Finish-type FB and Extrusion-type FB for Thin Foil of JIS SUS304 by Numerical and EBSD Analyses

Reduction of die roll height in duplex gears through a sheet-bulk metal forming method

Development of a shaving die design for reducing rollover

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