Study on high speed, high productive machining by machine tools developed for the agile manufacturing system

(1)减少高速、高加速度运动时的残余振动高速、高加速度运动时，机床会产生较大的振动，容易对刀具产生严重的损伤。为了避免这些现象，利用伺服模拟器分析了在不同伺服参数和不同加速度模式下的剩余振动。结果表明，“s”型加速方式对减小机床的残余振动最为有效，并在高速高加速度加工中心上进行了实验验证。(2)分析了高速、高加速度对机床加工精度的影响采用交叉网格法测量和分析了机床在高速、高加速度运动时由于伺服响应延迟引起的运动精度，并通过前馈控制和病态运动补偿来降低运动精度。(3)高速、高加速度加工对刀具寿命的影响分析刀具在高速、高加速度加工中容易失效。以铸铁铝合金为例，探讨了刀具失效的预防方法。通过调整主轴冷却液供给和选择合适的控制参数，在这种恶劣的切削条件下，钻头的寿命延长了3倍。

(1)Decreasing of residual vibrations at high speed and high acceleration motionBig vibrations are introduced at the high speed and high acceleration motion to the machine body and severe damages are easy to generate at the cutting tool. Avoiding these phenomena, residual vibrations are analyzed by using servo-simulator under various servo-parameters and various acceleration modes. As the results, the "S-style" acceleration mode is the most effective to decrease the residual vibrations of the machine body and it is also confirmed by the experiment using the high speed and high acceleration machining center.(2)Analyzes of the effect of the high speed and high acceleration on the machined accuracyBy using cross-grid-method, the motion accuracy of the machine tools due to the delay of the servo response are measured and analyzed at the high speed and high acceleration motion and the motion accuracy could be decreased by feed-forward control and sick-motion compensation.(3)Analyzes of the effect of the high speed and high acceleration machining on tool lifesThe cutting tools are easy to failure at the high speed and high acceleration machining. The preventing methods of tool failure are examined in the case of drilling of cast iron aluminum alloy. By the adaptation of spindle-through coolant supply and selection of suitable control parameters, the life of drills are enlarged by three times at these severe cutting conditions.