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针对目前多轴联动条件下S形加减速算法复杂,一条插补线段内最大进给速度不能实时可调的问题,提出了一种插补速度实时可调的前瞻控制算法。算法首先根据机床特性和线段夹角建立了小线段衔接处进给速度的约束条件,然后采用加速度跟随原理提出了最大进给速度连续可调的S形加减速控制方法,在此基础上设计了一种加速度自适应调整的前瞻处理算法。该算法在不降低轨迹插补精度的前提下,能以最大的速度通过线段的转接点,从而使整个线段插补过程具有高度的柔性和快速性,能满足现代数控系统对前瞻处理的实时性要求。结果表明该算法有效降低了机床运动时的振动,与传统速度规划算法相比,同等加工条件下,加工效率明显提高,工件表面质量也得到改善。
Aiming at the problem that the S-shape acceleration and deceleration algorithm is complex and the maximum feed speed in an interpolation line segment can not be adjusted in real time under the condition of multi-axis linkage, a forward control algorithm with real-time adjustable interpolation speed is proposed. According to the characteristics of machine tool and the included angle of the line, the algorithm first establishes the constraint condition of the feed speed at the convergence point of the small line segment, and then proposes the S-shaped acceleration and deceleration control method with continuously adjustable maximum feed rate by using the principle of acceleration follow. On this basis, A Lookahead Processing Algorithm of Acceleration Adaptive Adjustment. Without reducing the accuracy of trajectory interpolation, the algorithm can pass the transition point of the line segment at the maximum speed, so that the entire line segment interpolation process has a high degree of flexibility and rapidity, and can satisfy the requirements of modern numerical control system for real-time processing Sexual requirements. The results show that this algorithm can effectively reduce the vibration of machine tool. Compared with the traditional speed planning algorithm, under the same processing conditions, the processing efficiency is obviously improved and the surface quality of the workpiece is also improved.