Development of incremental forming technology with local heating by laser irradiation as a quality-products processing technology for difficult-to-form sheet metals

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05728
• 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: Hiroshima University
• Principal Investigator: Hino Ryutaro 広島大学, 工学研究科, 准教授 (10283160)
• Research Collaborator: YOSHIDA Fusahito 広島大学, 大学院工学研究科, 特任教授 (50016797) ; KAWABATA Keita ; MURAO Kohei ; KURISAWA Takuya ; Ahmad Eka Siwi ; MATSUMOTO Junki ; SATO Atsushi
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: レーザ局所加熱逐次張出し / インクリメンタルフォーミング / マグネシウム合金板 / チタン板 / 成形性 / 微視組織と機械的特性 / 形状精度

Outline of Final Research Achievements

Incremental sheet forming experiments with local heating by laser irradiation were conducted using AZ31 magnesium alloy sheets with a thickness of 0.78 mm and pure titanium sheets with a thickness of 1 mm. Truncated cone shells and truncated square pyramid shells were formed under various conditions. Then influences of local heating conditions and forming conditions on formability and product shape accuracy were investigated. Influences of the local heating / forming process on microstructure and mechanical properties of the formed products were also examined.
As for AZ31 alloy sheet, the rise in the local heating temperature leads to improvement of the formability, but in the case of pure titanium sheet the formability at high temperature deteriorates due to the occurrence of pinhole-like defect. Hardness of the AZ31 products varied depending on work hardening, dynamic recrystallization and grain growth during forming, and became higher as the local heating temperature decreased.

Free Research Field

弾塑性工学，塑性加工学