Sophistication of air turbine-driven aerostatic spindle and improvement of the performance of planetary milling

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04203
• 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: Fukuoka Institute of Technology
• Principal Investigator: Kato Tomonori 福岡工業大学, 工学部, 准教授 (20390429)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: Air spindle / Pneumatics / Milling / Drilling / Magnetorheological fluid

Outline of Final Research Achievements

The goal of this research was to apply pneumatic servo control technology to achieve high performance of air turbine spindles used in ultra-precision machining, and to achieve high precision and high efficiency in cutting by such spindles. Specifically, the research was conducted on four points as follows: "Control of spindle position and stiffness of aerostatic bearing type air turbine spindle", "Study on tool wear estimation for small diameter ball end mill milling", "Research on breakage detection based on the breakage mechanism of small-diameter drills" and "Dynamic characteristics of magnetorheological fluid brake for use with air turbine spindle”. By integrating these technologies, the high functionality of the planetary milling unit can be established.

Free Research Field

機械工学

Academic Significance and Societal Importance of the Research Achievements

本研究は、空気圧サーボの制御技術を応用して、超精密加工に用いられるエアタービンスピンドルの高機能化と，それによる切削加工の高精度・高効率化を実現することを目標としたものである。本研究で技術的課題として解決に取り組んだ「静圧空気軸受のコンプライアンス制御」「ミーリング工具の切削力と損耗推定」「ドリル加工時の工具の折損検知」「MR（磁気粘性流体）ダンパを用いたエアタービンの低速領域の回転数制御」はいずれも先行研究事例や特許は見られず独創的なものであり、本研究の成果は今後、次世代レベルの機能表面加工を実現していくために大いに役立つものであると考えられる。