Deformation behaviour in shearing of Ultra-High Strength Steel sheets under insufficient blankholding force

Yagita, Ryo; Abe, Yohei; Munesada, Yuma; Mori, Kenichiro

doi:10.1016/j.promfg.2020.08.006

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…The estimated tensile strength is lower than the tensile strength for the miniature specimens. Since the top and flange of the stamped part were slightly curved, shearing in punching is incremental, and thus, the estimated tensile strength from the punching load was reduced by the effect of the shear angle [32].…”

Section: Cold-stamped Partmentioning

confidence: 99%

Punching test for estimating tensile strength and total elongation of steel sheets

Nakamura

Mori

Okada

et al. 2021

Int J Adv Manuf Technol

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A punching test for simply estimating the tensile strength and total elongation of steel sheets and formed parts was proposed. The tensile strength and total elongation were estimated from the shear stress at the maximum punching load and percentage of the burnished depth at the sheared edge of the slug measured without cutting, respectively. For a variety of steel sheets with a range of the tensile strength from 360 to 1500 MPa, linear functions for the estimation were experimentally obtained. The correlation of the estimated tensile strength of the steel sheets with the measured one from the uniaxial tensile test was considerably high, and the correlation of the estimated total elongation was high. The distributions of tensile strength and total elongation for hot- and cold-stamped parts were estimated. The proposed punching test is available under not only a laboratory environment but also a factory environment.

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Section: Cold-stamped Partmentioning

confidence: 99%

Punching test for estimating tensile strength and total elongation of steel sheets

Nakamura

Mori

Okada

et al. 2021

Int J Adv Manuf Technol

Self Cite

View full text Add to dashboard Cite

show abstract

“…Yohei et al [22] applied a step punch to improve the tool life when punching ultra-high-strength steel sheets. Ryo et al [23] studied the effect of the blank holder force on the shearing process with ultra-high strength steel sheets. Won et al [24] proposed a new design for two-stage blanking to improve the edge stretchability of third-generation advanced high-strength steels.…”

Section: Introductionmentioning

confidence: 99%

Novel piercing punch design for realizing clean cutting surface of aluminum alloy and its application to enhancing hole flanging ability

lawanwong,

leetrakul

2024

Preprint

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The effects of piercing parameters such as clearance, cutting distance, surface roughness on the sheared surface, and the delay-cracking mechanism in the hole-piercing process are investigated in this study. The characteristics of the piercing hole cross-section are compared based on a statistical analysis and finite element simulation results to realize a new punch design concept. The statistical analysis revealed that the differences in the mean sheared surface between the new and conventional punch designs were statistically significant under all the conditions. The experimental results for all the piercing clearances demonstrate that the new punch design can significantly reduce the die roll size and generate a smooth sheared surface. The use of an accurate finite element simulation allows us to understand the process parameters before fabricating the die. An advantage of the new piercing punch design in terms of hole-flanging ability is observed through an increased hole-expansion ratio. The new design can also produce high-quality, cutting-edge aluminum and advanced high-strength steel sheets.

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“…Because the sheared edge of the sheet has large plastic deformation and fracture in shearing, the sheared edge qualities was usually changed. Yagita et al [6] showed that the sheared edge of the ultra-high strength steel sheets was affected by the shear angle in the punch and the blankholding force. The sheared edge qualities for edge cracking in the hole expansion [7] and the stretch flange abilities [8] were investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of shear angle in shearing on stretch flangeability of ultra-high strength steel sheets

Yagita

2023

Materials Research Proceedings

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Abstract. The effect of the shear angle in shearing on the stretch flangeability of 980 MPa ultra-high strength steel sheets was examined. The sheared edges of the ultra-high strength steel sheets sheared at different shear angles were investigated, and then the cracking on the sheared edge after stretch flanging was observed. The length of the fracture surface in the sheared edge was decreased by shearing with the punch with a shear angle, whereas many cracks and burrs at the edge of the fracture surface were caused, and the boundary between the burnished and fracture surfaces became rougher. In stretch flanging, the cracks in the fracture bottom side rapidly increased with the bending length. The stretch flangeability increased at a shear angle, where the number of cracks per unit length was the highest, i.e. this indicates that the large number of cracks in the sheared edge were effective in suppressing penetration cracking to fracture in the stretch flanging.

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Deformation behaviour in shearing of Ultra-High Strength Steel sheets under insufficient blankholding force

Cited by 7 publications

References 11 publications

Punching test for estimating tensile strength and total elongation of steel sheets

Punching test for estimating tensile strength and total elongation of steel sheets

Novel piercing punch design for realizing clean cutting surface of aluminum alloy and its application to enhancing hole flanging ability

Effect of shear angle in shearing on stretch flangeability of ultra-high strength steel sheets

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