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자기회귀 벡터모델을 이용한 정면밀링의 동절삭력 모델해석
백대균,김정현,김희술 대한기계학회 1993 대한기계학회논문집 Vol.17 No.12
Dynamic cutting process can be represented by a closed-loop0 system consisted of machine tool structure and pure cutting process. On this paper, cutting system is modeled as a six degrees of freedom system using MARV(Modified Autoregressive Vector) model in face milling, and the modeled dynamic cutting process is used to predict dynamic cutting force component. Based on the double modulation principle, a dynamic cutting force model is developed. From the simulated relative displacements between tool and workpiece the dynamic force domponents can be calculated, and the dynamic force can be obtained by superposition of the static force and dynamic force components. The simulated dynamic cutting forces have a good agreement with the measured cutting force.
백대균 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.1
In order to monitor the tool wear in milling operation, cutting force is measured as the tool wear increased. The digital signal processing methods are used to detect the tool wear. As AR parameter extract the feature of tool wear, it can be used as input parameter of pattern classifier. The FFT monitors the tool wear exactly, but it can not do real time signal processing. The band energy method can be used to real time monitoring of tool wear, but it can degrade the exact monitoring.
표면노조 모델을 이용한 졍면밀링에서의 최적 이송속도 선정
백대균,고태조,김희술,Baek, Dae-Kyun,Ko, Tae-Jo,Kim, Hee-Sool 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.8
Determination of an optimal feed rate is valuable in the sense of the precision and efficient machining. In this regard, a new surface roughness model for the face milling operation that considered the radial and axal runouts of the inserts in the cutter body was developed. The validity of the model was proved through the cutting experiments, and the model is able to predict the real machined surface roughness exactly with the information of the insert runouts and the cutting conditions. From the estimated surface roughness value, the maximum feed rate that obtains a maximum naterial removal rate under the given surface roughness constraint can be selected by using a bisection method. Therefore, this mehod for optimizing the feed rate can be well applied to the using a bisection method. Therefore, this method for optimizing the feed rate can be well applied to the using selsction of the cutting condition during the NC data generation in CAM.
백대균,고태조,김희술,Baek, Dae-Kyun,Ko, Tae-Jo,Kim, Hee-Sool 한국정밀공학회 1995 한국정밀공학회지 Vol.12 No.12
This paper presents the surface profile of machined workpiece in face milling operation. The roughness model of feed direction is considered the cutting condition, the profile and run-out of inserts. For the dynamic model the cutting system can be modeled as avibratory system. The dynamic model of surface roughness is considered the relative displacements between tool and work- piece which can be obtained from the cutting system. These model can predict various surface roughnesses. i.e. maximum and arithmetic mean surface ruughnesses. Therefore, the developed model can be used for the monitoring of surface roughness.
Fast and Precision NURBS Interpolator for CNC Systems
백대균,양승한,고태조 한국정밀공학회 2012 International Journal of Precision Engineering and Vol.13 No.6
This paper presents a performance evaluation of a NURBS interpolator that uses not Taylor’s expansion method but the recursive characteristics of NURBS. Taylor’s expansion has mostly been used for NURBS interpolation. However, it is very complicated and gives an indispensable truncation error. A fast and precision NURBS interpolator replacing Taylor’s expansion is presented for CNC systems in robots and CNC machine tools. The presented interpolation algorithm uses the recursive equation of the NURBS formula rather than Taylor’s expansion. A simulation study is conducted to demonstrate the advantages of this proposed interpolator compared with those using Taylor’s equation. The feedrate error and calculation time are simulated in the performance evaluation. The recursive method of NURBS interpolation is faster and more accurate than Taylor’s expansion.
정면밀링 작업에서 In-Process 절삭상태인식에 관한 연구
권종완,김정현,백대균 경일대학교 산업기술연구소 1994 産業技術硏究所 論文集 Vol.4 No.-
The dynamic cutting system is defined by the dynamics of the cutting process and by the structural dynamics of the machine tool. The machining process can be represented by a closed-loop system consisted of machine tool structure and pure cutting process. On this paper, the in-process identification of the instantaneous dynamics of a machining system is performed by multi-variate stochastic time series. The transfer functions of cutting dynamics and structural dynamics can be obtained in cutting operation.