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- 저자 : Peiqing Ye (검색결과 1 건)
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Yong Zhang,Peiqing Ye,Hui Zhang,Mingyong Zhao 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.10
Linear toolpath, which is always in forms of a large amount G01 codes, is most popular in practical Computer Numerical Control (CNC) systems. The linear toolpath discontinuity will bring the unavoidable fluctuations on velocity and acceleration, leading to unsatisfied machining efficiency and quality. To improve the G01 machining, corners are normally smoothened by various smooth curves and in this paper, a novel two-step method including path-smoothing and feedrate scheduling is proposed. In path-smoothing, a B-spline curve is adopted to blend sharp corners locally and the smooth curvature along transition toolpath is obtained. With constrained chord error, the analytical curvature extreme is proved to occur at the B-spline midpoint and optimal curvature extreme is searched to enhance machining efficiency. In feedrate scheduling, based on the extreme points, a look-ahead methodology is utilized to determine the reachable feedrate at these critical points and a jerk-continuous scheduling scheme is developed afterwards. To verify the proposed method, tracking and machining experiments are conducted to demonstrate the efficiency, contour performance as well as machining quality compared to point-to-point and curvature-continuous methods.
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