Development of Three-Dimensional Hot Bending and Direct Quench using robot

Kazuo, Uematsu; Shimada, Naoaki; Tomizawa, Atsushi; Mori, Hiroshi

doi:10.1109/iciibms.2015.7439503

Cited by 4 publications

(1 citation statement)

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“…By this process consecutively, the products which have complex three-dimensional bent shape and ultrahigh tensile strength are obtained (Figure 4). The 3DQ technology has achieved the following characteristics: [8][9][10][11][12] 1.…”

Section: Features Of 3dq Technologymentioning

confidence: 99%

Crash Characteristics of Partially Quenched Curved Products by Three-Dimensional Hot Bending and Direct Quench

Tomizawa

Hartanto

Kazuo

et al. 2020

Metals

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Recently, improvement of hybrid and electric vehicle technologies, equipped with batteries, continues to solve energy and environmental problems. Lighter weight and crash safety are required in these vehicles body. In order to meet these requirements, three-dimensional hot bending and direct quench (3DQ) technology, which enables to form hollow tubular automotive parts with a tensile strength of 1470 MPa or over, has been developed. In addition, this technology enables to produce partially quenched automotive parts. In this study, the crash characteristics of 3DQ partially quenched products were investigated as the fundamental research of the design for improving the energy absorption. Main results are as follows: (1) for partially quenched straight products in axial crash test, buckling that occurs at nonquenched portion can be controlled; (2) for the nonquenched conventional and overall-quenched curved products, buckling occurs at the bent portion at the initial stage in axial crash tests, and its energy absorption is low; (3) by optimizing partially quench conditions, buckling occurrence can be controlled; and (4) In this study, the largest energy absorption was obtained from the partially quenched curved product, which was 84.6% larger than the energy absorption of the conventional nonquenched bent product in crash test.

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Section: Features Of 3dq Technologymentioning

confidence: 99%