动态数控开发将控制权交给Heidenhain TNC用户

Heidenhain表示，Dynamic Efficiency将有效的控制程序与智能加工策略相结合，同时还可以充分开发机器的潜力，同时限制机械负载/过程诱导的振动。动态精度是指通过结合“串扰”补偿、主动振动阻尼和负载运动以及位置自适应控制，消除动态机器运动引起的加工误差，提高加工精度。Heidenhain说，作为动态效率库的一部分，主动颤振控制(ACC)通过应用“阻尼”来增加颤振产生的切削率，减少颤振的发生，从而提高进给速率。ACC通过进料驱动器的测量信号检测颤振，然后使用驱动器-高达100赫兹的频率范围-从振动中提取能量。由于ACC的工作频率范围低于工具的啮合频率，TNC用户可以确定何时使用ACC。可以为每个工具选择单独的参数。Heidenhain表示，在一系列铣削金属和刀具的实验中发现，在颤振是工艺限制因素的情况下，ACC将金属去除率提高了25%。该公司表示，ACC还提高了刀具寿命，并对机床主轴、导轨、滚珠丝杆和轴承产生了积极影响。据说Dynamic Efficiency还包含了自适应进给控制功能——根据加工条件优化进给速度——和摆线铣削，加速槽和口袋的粗糙加工。Dynamic Precision对加速度相关定位误差(CTC)的补偿是Heidenhain软件解决方案的一部分，它可以测量工具中心点的任何误差，并提供同步补偿。 The value of these errors and the parameters involved are either known in the control (acceleration) or can be determined by measurement (machine stiffness). Dynamic acceleration – in the direction of the axes (and in axes that are perpendicular to the direction of acceleration) – causes forces that can briefly deform parts of the machine. The mass and inertia that is generated can therefore create pitching movements during braking and acceleration. The resulting positioning errors are proportional to the acceleration of the moving feed axes. The values of these errors also depend on the stiffness of the guideways, the distance between the feed force application point and the centre of mass, as well as the distance between the centre of mass and the tool centre point. Such errors are not recognised by the machine's position encoders, so the feed axis servo-control cannot react to them. Use of CTC, however, has proved that up to 80% of mean error can be reduced, thereby reducing jerk (changing acceleration) significantly and machining time, says Heidenhain. It is claimed that this decrease in jerk has seen contouring times reduced by up to 15% and mean error half that attained without CTC . Dynamic Precision includes functionality for active vibration compensation, position-dependent adaptation of control parameters, and load- and motion-dependent adaptive capabilities. Heidenhain TNC 640, 620 and 320 control systems will be shown on the company's stand.