Study on high efficiency method of electrical discharge forming with microbubbles using resin mold made by three-dimensional printer

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K04111
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18020:Manufacturing and production engineering-related
• Research Institution: Waseda University (2020-2022); Saitama Institute of Technology (2019)
• Principal Investigator: Koita Taketoshi 早稲田大学, 理工学術院, 講師(任期付) (00750192)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 衝撃波 / マイクロバブル / 放電成形 / 水中放電 / 樹脂型 / 3Dプリンター

Outline of Final Research Achievements

We studied the development of underwater electrical discharge forming with resin mold which was made by the 3D-printer with the microbubble attachment on the bottom of metal plate to address the issue of excessive cost of metal mold used traditionally in the forming. The forming was conducted by the high pressure of rebound shock wave emitted by the bubble collapse which was induced by the interaction of underwater shock wave generated by the discharge. We developed the pressure measurement of loading underwater shock wave with isolating the magnetic field noise during discharge and evaluated the pressure estimation formula for the shock wave. The bottom of metal plate was attached to microbubbles that diameter was changed and the impact pressure at the collapse of microbubbles acting on the bottom was theoretically analyzed. Based on this analysis, we established the discharge forming with 3D-printed resin molds using the impact pressure generated by the underwater shock wave loading.

Free Research Field

衝撃波工学

Academic Significance and Societal Importance of the Research Achievements

本研究成果は3Dプリンタ造形樹脂型用いたマイクロバブル活用放電成形に必要な放電時の磁場ノイズを絶縁した放電誘起水中衝撃波の圧力測定の開発，および，成形を誘起する金属板底面に付着させたマイクロバブル径の理論解析を評価した学術的意義を有する。本研究成果では放電成形での金型に樹脂型を適用したため，工業製品，自動車部品の製造に欠かせないプレス加工での金型の低コスト化に寄与する社会的意義を有する。