Estimation of tool vibration displacement by using hybrid spindle system for machining center

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03813
• 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: Kagoshima National College of Technology
• Principal Investigator: Shimana Kenji 鹿児島工業高等専門学校, 電子制御工学科, 教授 (90353359)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 振動変位 / 切削抵抗 / 小径エンドミル / ハイブリッド主軸 / 磁気軸受

Outline of Final Research Achievements

The purpose of this study is to highly accurately estimate the deflection at the cutting edge of a small-diameter end mill using gap sensors built into a hybrid spindle supported by ball bearings and magnetic bearings. Cutting experiments were conducted in which the axial depth of cut increased linearly. The effectiveness of the method for estimating the displacement of the tool at cutting point from the displacement of the lower end of the tool holder to which the silicon steel plate is fixed, measured by a gap sensor, was verified. In cutting tests, the machining error in the feed direction tended to qualitatively coincide with the cutting force in the vertical direction for both down-cutting and up-cutting.

Free Research Field

切削加工学

Academic Significance and Societal Importance of the Research Achievements

主軸系に通常の転がり軸受を用いたマシニングセンタを用い、電磁力によりエンドミル先端を制御し、さらにラジアル磁気軸受に取り付けた変位センサによりエンドミル先端の振動変位を推定しようとする研究はこれまでにない。また一つの装置で加工能率と加工精度の向上が可能な装置の開発を目指す研究もこれまでにない。さらに磁気軸受を用いた場合よりも装置は簡素なため、提案している制御システムを組み込んだツーリングシステムの実用化が期待できる。