高速加工中速度前瞻控制新算法研究

为了避免在高速加工中高曲率轮廓导致的工件过切和机床的异常振动，提出了一种实时的速度前瞻软件控制新算法.该算法基于S型加减速方案，通过采用三次样条曲线拟合对离散加工路径的分析发现高曲率点，根据加减速特性预估高曲率点处的最优速度，最后对加工路径施加相应的运动学曲线规划，实现了加工速度自适应于加工路径的变化.应用该算法使得加工速度变化平稳，较之传统控制方法大大提高了加工效率.

New look-ahead algorithm for velocity control in high speed machining

A novel realtime software control algorithm for look-ahead velocity control was proposed to avoid gouging and mechanical vibration caused by high curvature of toolpath in high speed machining. This algorithm was based on S type velocity acceleration and deceleration. The high curvature points were found through analyzing the toolpath by using cubic spline interpolation. Then the optimal velocities at the high curvature points were estimated according to the characteristic of velocity. Finally a proper kinematic profile was imposed on the toolpath and the velocity changing with the toolpath was achieved. The results show that the presented algorithm makes velocity changing smoothly and improves the productivity greatly compared with the traditional control method.