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안형준(Hyeong-Joon Ahn),박종민(Jong-Min Park),한동철(Dong-Chul Han) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
CCS was developed and applied to rotating machines because of accurately measuring the spindle error motion without significant efforts. However, researches on the CCS have been focused on ideal cases where circumferential gaps were ignored. This paper presents the effects of circumferential gaps and proposes an optimal CCS considering the circumferential gaps. First, electrostatic analysis of the CCS that includes the circumferential gaps is performed using the FEM, and an additional capacitance due to the circumferential gap can be approximated as an equivalent extended sensor length. Second, a mathematical model of the CCS considering the circumferential gaps is derived, and the optimal CCS is determined through minimization of the weighted error amplification factor. Finally, two CCSs, both considering and ignoring the circumferential gaps, are built, and the effectiveness of the optimal design is verified through simulation and experiment.
전자석 가진기를 이용한 고속주축의 회전속도에 따른 툴팁 컴플라이언스 측정
안형준(Hyeong-Joon Ahn),김진현(Jin-Hyun Kim),김종혁(Jong-Hyuk Kim),장동영(Dong-Young Jang),한동철(Dong-Chul Han) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper, we proposed a new measuring method of the speed-dependent tool tip compliance of a high-speed machine tool spindle using a magnetic exciter. Single sine wave current excitation is injected through the magnetic exciter, and the displacement and force responses are measured with a CCS (cylindrical capacitance sensor) and a dynamometer, respectively. Then, the tool tip compliance can be esticated accurately without any phase delay by dividing the frequency response from the current to the displacement by that from the current to the force. Finally, the tool tip compliance of a high-speed machine tool spindle was measured successfully using the proposed measuring method.