NC 工作機械の運動精度に関する研究(第4報) : 円弧補間時の半径減少の NC 補正

概要

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The actual circle radius decreases remarkably for high feed rates of NC machine tools during circular interpolation motion. This decreasing error ΔR is caused by delay factors inherent in the NC servo control system, expressed by the equation ΔR=(Ts^2+Tp^2)*F^2/2R, where R is the circle radius, Ts is the time constant of the smoothing loop, Tp is the time constant of the positon loop, and F is the feed rate. A feed forward control method that changes the interpolation vectors, and therefore is consistent with the conventional NC system, was developed to compensating for this error. The results show that the error was decreased in magnitude to one tenth of ΔR by this method when the feed rate was kept constant. The feed rate can be increased three times before the same error of ΔR appears.
公益社団法人精密工学会の論文
1988-06-05