엔드밀 가공시 절삭조건에 따른 진동응답 특성 (A Vibration Response Characteristics Depending on Cutting Conditions in End-milling)

서지정보

· 발행기관 : 한국기계가공학회
· 수록지 정보 : 한국기계가공학회지 / 23권 / 5호 / 1 ~ 10페이지
· 저자명 : 김종도, 김광희, 윤문철

초록

Vibration during end-milling is a forced vibration that occurs when the end mill blade impacts the workpiece and is processed. In other words, it can be viewed as a model of forced vibration caused by an external excitation force with an impact frequency according to the number of end mill blades, a vibration characteristic that changes depending on the amplitude and frequency of the cutting force, which varies depending on the cutting force conditions during end milling. Therefore, the end milling model should be defined as a second-order system to obtain the displacement, speed, and acceleration. Additionally, by expressing this vibration model as a differential equation and performing a numerical analysis, the time and frequency responses can be analyzed. In particular, the FRF(frequency response function) was analyzed to reveal the natural frequency of the system and the characteristics of the impact frequency applied to the workpiece by the end mill. Considering the impact force caused by the four-tooth cutter as an excitation force, the natural frequency, surrounding modes, power spectrum, real and imaginary parts of the FRF and the characteristics of each mode were analyzed in detail. After numerical analysis of the different mass, damping, and rigidity of the end milling, it can distinguish several modes that occur depending on the amplitude and frequency of the end milling force. Also, the response can be determined according to the dynamic force conditions during machining and the forced-vibration response characteristics was analyzed systematically.

영어초록

Vibration during end-milling is a forced vibration that occurs when the end mill blade impacts the workpiece and is processed. In other words, it can be viewed as a model of forced vibration caused by an external excitation force with an impact frequency according to the number of end mill blades, a vibration characteristic that changes depending on the amplitude and frequency of the cutting force, which varies depending on the cutting force conditions during end milling. Therefore, the end milling model should be defined as a second-order system to obtain the displacement, speed, and acceleration. Additionally, by expressing this vibration model as a differential equation and performing a numerical analysis, the time and frequency responses can be analyzed. In particular, the FRF(frequency response function) was analyzed to reveal the natural frequency of the system and the characteristics of the impact frequency applied to the workpiece by the end mill. Considering the impact force caused by the four-tooth cutter as an excitation force, the natural frequency, surrounding modes, power spectrum, real and imaginary parts of the FRF and the characteristics of each mode were analyzed in detail. After numerical analysis of the different mass, damping, and rigidity of the end milling, it can distinguish several modes that occur depending on the amplitude and frequency of the end milling force. Also, the response can be determined according to the dynamic force conditions during machining and the forced-vibration response characteristics was analyzed systematically.

참고자료

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