Development of egg-tray type metallic hollow sphere structure

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K06013
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Production engineering/Processing studies
• Research Institution: Kagawa University
• Principal Investigator: Hidenori Yoshimura 香川大学, 創造工学部, 准教授 (30314412)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: ポーラス金属 / 板材成形 / 中空金属球成形体 / 圧縮特性

Outline of Final Research Achievements

To develop a new ultra-light porous metal which can be mass-produced inexpensively, egg tray type metallic hollow sphere structure was proposed. First, the fabrication method was examined. Thin steel plates are formed to TAKOYAKI plate shape by drawing, two plate was joined by resin bond the plates to be an egg tray shaped component, and the components are piled up and joined by resin bond to make the new porous metal. Using the plastic working with precise dies, the porous metal is very homogeneous and reliable about the performance. Mechanical properties of the fabricated specimen is tested. As compressive property of the specimen, with the increasing amount of the semi-spherical bulging, the plateau stress region becomes large by 70%. So, it is confirmed that the new porous metal has a good compressive property.

Free Research Field

塑性加工

Academic Significance and Societal Importance of the Research Achievements

張出し加工時の絞り量を向上する加工プロセスを提案できた。また、張出し時のくびれ発生の成形限界予測法も提案した。これらは、板材成形の加工技術として学術的な意義がある。また、高品質かつ安価なポーラス金属材料の製法および性能を示せたことは、構造材料分野において学術的な以外がある。提案したポーラス材料が実用化された場合には、自動車等の軽量化、高剛性化、衝撃吸収性の向上を果たすことができ、燃費向上や衝突安全性の向上性につながり、温室効果ガスの低減などの社会的な意義につながる成果である。