一种多轴数控机床末端静刚度快速辨识方法

发布时间：2018-05-21 17:01

本文选题：加载式球杆仪 + 数控机床　；参考：《中国机械工程》2017年03期

【摘要】：提出了一种基于可加载式球杆仪的圆运动对多轴机床末端(刀具和工作台)静刚度进行辨识的方法。设计了一种特殊的可加载式球杆仪,能同时测量仪器两端所承受的力和发生的位移,利用该仪器能测量出数控机床末端在不同载荷下所产生的变形误差。将加工空间内机床末端静刚度分解为沿坐标轴x、y和z的方向刚度,建立了一种基于圆运动的刚度辨识模型,利用球杆仪在机床oxz、oyz和oxy平面内进行圆运动轨迹测试,得到机床末端在不同载荷下的变形误差,进而通过刚度辨识模型得到机床的方向刚度。三轴数控铣削机床刚度测试实验结果和仿真结果的一致性证明了所提出方法的有效性。该测试方法简单,仪器轻便,不需要大型和重型的加载设备,适合于工业现场条件。
[Abstract]:A method for identifying the static stiffness of the end of a multi-axis machine tool (tool and worktable) based on the circular motion of a loadable ball rod instrument is presented in this paper. A special loadable ball rod instrument is designed, which can simultaneously measure the force and displacement at both ends of the instrument, and can be used to measure the deformation error of the end of the NC machine tool under different loads. The static stiffness of the end of the machine tool in machining space is decomposed into the stiffness along the axis xy and z, and a stiffness identification model based on circular motion is established. The circular motion trajectory is measured in the plane of oxznoyz and oxy using a ball rod instrument. The deformation error of the end of the machine under different loads is obtained, and then the directional stiffness of the machine is obtained by the stiffness identification model. The validity of the proposed method is proved by the consistency between the experimental results and the simulation results. This test method is simple, the instrument is light, does not need the large and heavy loading equipment, is suitable for the industrial field condition.
【作者单位】：上海理工大学机械工程学院;
【基金】：上海市自然科学基金资助项目(13ZR1427500)
【分类号】：TG659

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