Computer Numerical Control plays an important role in mechanical manufacture. One of the key problems is the improvement of the machining velocity within the confined accuracy. In this paper, the interpolation problem is devided into two part: local optimization and global optimization. The local optimization improves the junction velocities of small line blocks by quadratic or cubic curves transition. The total transition time is determined by the maximal machining error. The interpolation parameters of every junctions can be uniformly adjusted by transition time which improves the intelligent of the CNC software. Then the global optimization is carried out according to the local optimization results by look-ahead scheme under linear acceleration/deceleration or S-shape acceleration/deceleration style. Look-ahead scheme can effectivly forecast the subsequent machining path, avoiding the abrupt acceleration or deceleration, and promising the improvement of global velocity. This algorithm adopt the compound of symbolic and numeric computation, which is simple and satisfise the real time machining need. The method is also verified at Blue-Sky CNC machine. Compared with previous algorithms, the machinine velocity is improved by 50\%--170\% under different machining parameters. The validity of this algorithm is proved by practice machining.
ZHANG Lixian
, SUN Ruiyong
, LI Hongbo
, GAO Xiaoshan. , {{custom_author.name_en}}.
Local Optimization Based on Kinematic Curve and Global Optimization Based on Look-Ahead Shceme in CNC Interpolation. Journal of Systems Science and Mathematical Sciences, 2010, 30(11): 1548-1561 https://doi.org/10.12341/jssms09426
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