数控加工系统的随动控制研究

Research on the follow-up control for CNC machining system

基于西门子840D数控系统,提出一种随动加工控制的原理和方法,控制系统通过测距传感器反馈值直接控制刀具随动进给,实现对大型自由曲面表面非金属涂层的等厚加工.为使工件表面非金属涂层加工平整、等厚,加工过程中需保持刀具到工件表面等距.设计中在刀具轨迹前放置测距传感器,实时检测工件表面位置,控制刀具随动进给,实现工件表面非金属涂层的等厚加工.实验结果验证了该控制方法的有效性.

A kind of follow-up machining control method is proposed based on SINUMERIK 840D CNC systems, which can machine the non-metallic material on the workpiece＇ s free-form surface e- qual-thickness. The tool is directly controlled to follow-up feed according to the feedback of position sensor. In order to make the non-metallic material smooth and equal-thickness, the distance between the tool and the surface of the workpiece should be kept constant. In the design, the sensor is placed in front of the tool, so the measurement and the machining can operate at the same time, And experi- mental results verify the effectiveness of the control method.