Deformation behaviour and reduction in flying speed of scrap in trimming of ultra-high strength steel sheets

Abe, Yohei; Okamoto, Yoshio; Mori, Ken-ichiro; Jaafar, H.

doi:10.1016/j.jmatprotec.2017.07.034

Cited by 14 publications

(4 citation statements)

References 20 publications

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“…Although hot-stamped components having high strength hardly deform, the components are fractured by a small displacement because of low ductility. When the component is fractured by a collision of automobiles, separated pieces fly at a high speed due to rapid release of collision energy, and this is very dangerous [28]. This separation is prevented by welding with a 270 MPa mild steel patch having high ductility even after hot stamping.…”

Section: Prevention Of Separation Of Fractured Components Using 270 Mmentioning

confidence: 99%

Steel sheets partnered with quenchable sheet in hot stamping of tailor-welded blanks and its application to separation prevention of fractured components

Mori

Suzuki

Yokoo

et al. 2020

Int J Adv Manuf Technol

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The phase transformation and mechanical properties of non-quenchable steels partnered with the quenchable boron steel in hot stamping of tailor-welded blanks were evaluated to produce tailored components with partially balanced strength and ductility. The effect of the forming start temperature after natural air cooling on the phase transformation and mechanical properties for 270 MPa mild steel, non-quenchable steel, 440 MPa high strength steel, and 22MnB5 steel sheets was examined, and the 270 MPa and non-quenchable sheets had enough ductility after hot stamping. Tailored components having a hardness of about 500 HV1 in the high strength zone and a total elongation of about 30% in the high ductility zone were hot-stamped from a tailor-welded blank composed of 22MnB5 and 270 MPa sheets. It was found that the 270 MPa mild steel sheet is sufficient as a partner sheet of tailor-welded blanks. In addition, the safety of hot-stamped components was heightened by welding a 22MnB5 main blank with a 270 MPa steel patch. Even if the main blank is fractured by a collision, the hot-stamped component is not separated by the 270 MPa patch having high ductility.

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Section: Prevention Of Separation Of Fractured Components Using 270 Mmentioning

confidence: 99%

Steel sheets partnered with quenchable sheet in hot stamping of tailor-welded blanks and its application to separation prevention of fractured components

Mori

Suzuki

Yokoo

et al. 2020

Int J Adv Manuf Technol

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“…[2]. Die punching whether in production costs, processing efficiency and equipment investment has certain superiority [3].…”

Section: Introductionmentioning

confidence: 99%

Research on the Influence of Punching Parameters and Selection of Fracture Damage Model for Punching

Yang¹,

Huang²,

Han³

et al. 2023

Atlantis Highlights in Materials Science and Technology

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Due to the advantages of high efficiency, low energy consumption and wide applicability, die punching has been widely used in the shearing process of automotive parts. However, it is seldom used on ultra-high strength steel due to the high punching force and risk of tool wear. In this paper, study of die punching process for hot stamped steel Usibor 1500P has been carried out. Firstly, the influence of process parameters including punching velocity, die clearance, punch corner radius, sheet thickness, punch diameter and punch shape have been studied through a specifically designed punching tool. Corner radius at the punch edge can significantly improve the sheared edge quality, and tapered flat-bottomed punch and conical shaped punch evidently reduce and raise the maximum punching force respectively. Secondly, based on the damage thresholds obtained from "iterative prediction-correction" method, finite element fracture model for the die punching process of Usibor 1500P has been constructed and validated, the Oyane and MMC damage models are considered as the most suitable for describing the fracture characteristics of the Usibor 1500P during punching.

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“…The application of UHSS sheets has become essential in modern car manufacturing, mainly for the chassis and the body-in-white (BIW) parts of a car, as the structure made of this material can uphold high impact force in case of any collision occurs [11,12]. The BIW of vehicle parts, such as the front pillar, center pillar, and cross member, are stamped in a mold, followed by secondary processing, such as bending and flanging, before being moved to the finishing process [13][14][15]. Since the formability of the UHSS is low and the strength is high, performing the sheet metal working process, such as punching and trimming on the UHSS, is challenging [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Inclined Angle in Trimming of Ultra-high Strength Steel Sheets Having Inclined and Curved Shapes

Leong,

Jaafar,

Tajul

et al. 2023

IJE

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Trimming the scrap portion of ultra-high strength steel (UHSS) components poses a significant challenge due to the inherent high strength and hardness characteristics of the material. For UHSS components with a higher geometric complexity such consisting of inclined and curved sections, sharp tilt, and small bend radius, the large trimming load results in poor sheared quality and shape defects, which commonly happen in these areas. This research investigated the effects of applying a small inclination angle to the punch in the trimming of the UHSS parts having an inclined and curved shape. The inclined punch was modified to four sets of different degrees of inclination i.e., 1°, 3°, 5°, and 10°. A comparative analysis of the trimming load, trimming energy, sheared edge quality and shape defects was conducted between these modified punches and the normal punch for their effectiveness in the trimming operation. Results showed that the application of inclination angle significantly decreased the trimming load, reduced the trimming energy, and improved the sheared edge surface quality, as well as prevented the shape defects at the inclined and curved zones as compared to the outcomes produced when trimming using the normal punch. The study suggested that the change to the punch geometry is an effective option to improve the performance of the process as well as the quality of the part, particularly in trimming the high-strength components having complex shapes.

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Deformation behaviour and reduction in flying speed of scrap in trimming of ultra-high strength steel sheets

Cited by 14 publications

References 20 publications

Steel sheets partnered with quenchable sheet in hot stamping of tailor-welded blanks and its application to separation prevention of fractured components

Steel sheets partnered with quenchable sheet in hot stamping of tailor-welded blanks and its application to separation prevention of fractured components

Research on the Influence of Punching Parameters and Selection of Fracture Damage Model for Punching

Effect of Inclined Angle in Trimming of Ultra-high Strength Steel Sheets Having Inclined and Curved Shapes

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