Study on ultrasonic-vibration shearing for electromagnetic metal sheet of next-generation motors

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04129
• 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: Nippon Institute of Technology
• Principal Investigator: Jin Masahiko 日本工業大学, 基幹工学部, 教授 (80265371)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 超音波振動 / 電磁鋼板 / アモルファス合金 / シェービング / 切口面

Outline of Final Research Achievements

The performance of an electric motor largely depends on the electromagnetic characteristics of the rotor and stator. The core and stator are laminated structures of non-oriented electrical steel sheets and amorphous alloys. Shearing is mainly used for manufacturing, but there is a problem that electromagnetic characteristics such as iron loss rate and magnetic flux density deteriorate due to the influence of increased plastic strain on the cut surface. In this study, we investigated the processing method of the above materials by the ultrasonic vibration shaving method. We developed a simple experimental device, conducted a basic shaving experiment, and evaluated the cut surface. As a result, it was clarified that the processing accuracy of the cut surface can be greatly improved and the productivity can be improved. We believe that this result will be one solution for manufacturing high-performance cores and stators.

Free Research Field

機械工作

Academic Significance and Societal Importance of the Research Achievements

超音波振動シェービング法は，シェービング刃に対して加工方向と同方向の超音波振動を作用させながら加工する方法である．この加工原理は，切削を微細に断続化することにより，せん断ひずみの蓄積による破断の発生を防止できるものと考えられる．無方向性電磁鋼板やアモルファス合金は脆性材料であるが，同加工法の適用により破断発生を防止できるものと考察した．実験結果は，その考察を裏付けるものであり，同材料の精密加工法になりうることを発見した学術的意義は大きい．この技術の実用のためには，生産用工具や機械，最適加工条件など，開発すべき要素が多々あるが，一つの方向性を原理的に提示することができた社会的意義も大きい．