scholarly journals Formable Range in Three-Dimensional Hot Bending and Direct Quench Process

2016 ◽  
Vol 57 (668) ◽  
pp. 879-885 ◽  
Author(s):  
Hiroaki KUBOTA ◽  
Atsushi TOMIZAWA ◽  
Nobuhiro OKADA ◽  
Kenji YAMAMOTO ◽  
Takayuki HAMA ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Direct Quench

Weight Reduction of the Automotive Body by using Three-Dimensional Hot Bending and Direct Quench (3DQ) Technology

2015 ◽  
Vol 84 (7) ◽  
pp. 514-518
Author(s):  
Ryuji HAMADA ◽  
Hiroki FUJIMOTO ◽  
Masahiro OGAWA ◽  
Naoaki SHIMADA
Keyword(s):  
Weight Reduction ◽  
Three Dimensional ◽  
Automotive Body ◽  
Direct Quench

scholarly journals Forming Characteristics in Three-Dimensional Hot Bending and Direct Quench Process

2015 ◽  
Vol 56 (658) ◽  
pp. 961-966 ◽  
Author(s):  
Atsushi TOMIZAWA ◽  
Naoaki SHIMADA ◽  
Hiroaki KUBOTA ◽  
Nobuhiro OKADA ◽  
Mitsusato HARA ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Forming Characteristics ◽  
Direct Quench

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

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1322
Author(s):  
Atsushi Tomizawa ◽  
Sanny Soedjatmiko Hartanto ◽  
Kazuo Uematsu ◽  
Naoaki Shimada
Keyword(s):  
Energy Absorption ◽  
Three Dimensional ◽  
Crash Test ◽  
Initial Stage ◽  
Automotive Parts ◽  
Fundamental Research ◽  
Vehicle Technologies ◽  
Crash Characteristics ◽  
Crash Tests ◽  
Direct Quench

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.

scholarly journals Development of Three-dimensional Hot Bending and Direct Quench Technology

2014 ◽  
Vol 81 ◽  
pp. 2267-2272 ◽  
Author(s):  
Naoaki Shimada ◽  
Atsushi Tomizawa ◽  
Hiroaki Kubota ◽  
Hiroshi Mori ◽  
Mitsusato Hara ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Direct Quench

Development of Three-Dimensional Hot Bending and Direct Quench Mass Processing Technology

2015 ◽  
Vol 56 (659) ◽  
pp. 1019-1023
Author(s):  
Naoaki SHIMADA ◽  
Atsushi TOMIZAWA ◽  
Hiroaki KUBOTA ◽  
Hiroshi MORI ◽  
Mitsusato HARA ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Processing Technology ◽  
Direct Quench

The orbit of Pluto over a long interval of time

1966 ◽  
Vol 25 ◽  
pp. 227-229 ◽  
Author(s):  
D. Brouwer
Keyword(s):  
Periodic Orbit ◽  
Numerical Integration ◽  
Restricted Problem ◽  
Three Dimensional ◽  
The Third ◽  
Circular Restricted Problem ◽  
Resonance Relation

The paper presents a summary of the results obtained by C. J. Cohen and E. C. Hubbard, who established by numerical integration that a resonance relation exists between the orbits of Neptune and Pluto. The problem may be explored further by approximating the motion of Pluto by that of a particle with negligible mass in the three-dimensional (circular) restricted problem. The mass of Pluto and the eccentricity of Neptune's orbit are ignored in this approximation. Significant features of the problem appear to be the presence of two critical arguments and the possibility that the orbit may be related to a periodic orbit of the third kind.

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