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마이크로 비구면 렌즈 가공을 위한 초정밀 위치 제어 방법
김형태(HyungTae Kim),양해정(HaeJeong Yang),김성철(SungChul Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
A control method in interpolating aspherical tool path was proposed and experimented in a nano accuracy machine. The characteristics of this method are in velocity control by position feedback and nano level of position error. A tool path was partitioned by a distance interval and the ideal control inputs were calculated at each section. A section had accelerating region and velocity region. A motion profile at the section was determined from a surface function, feed speed and velocity-acceleration relation. The concept of control was originated from correcting ideal speed with feedback error. The motion profile was determined from acceleration ratio, feed rate, step size, position gain, and velocity gain. An experimental apparatus was constructed to evaluate the performance of this algorithm. Nano accuracy linear encoders were installed to check position control error. The control error of interpolating aspherical tool path was below ±170㎚.