A Coordinate Measuring Machine with Parallel Kinematic Structure

小行星9522845 坐标测量机的一种新的设计概念使用了一种新颖的并联运动结构，该结构为测量探头的定向提供了五个自由度。 该结构是一个六面体形成的两个四面体，共享一个共同的基地。 该设备的六条腿是伸缩管，其中包含激光球杆以测量其延伸，并通过球形磁性接头连接在一起。 五自由度定位的六次测量冗余将用于热环境的校准和补偿。六面体设计还保证了更低的质量，这意味着更好的动态性能。 研究的问题是：评估由连杆和磁性接头形成的结构的精度和热稳定性，通过抽真空或充氦的管激励和输送用于计量的激光束，以及控制和动态性能测试。 使用自补偿使其对热不敏感，这种设计可以从温度控制室转移到工厂车间。 更小的质量改善了动态响应，因此可以更快地进行测量，降低检测成本。 综上所述，该项目的影响将是更快地反馈机械零件的尺寸属性，加快工艺改进。 ***

9522845 Ziegert A new design concept for coordinate measuring machines uses a novel parallel kinematic structure that provides five degrees of freedom for orientating the measurement probe. The structure is a hexahedron formed from two tetarahedra that share a common base. The six legs of the device are telescoping tubes that incorporate laser ball bars to measure their extension, held together by spherical magnetic joints. The redundancy of six measurements for five degrees of freedom positioning will be used for calibration and compensation for the thermal environment. The hexahedron design also promises lower mass, which means improved dynamic performance. The research issues are: assessing the accuracy and thermal stability of the structure formed by the links and magnetic joints, the actuation and delivery of laser beams for metrology through evacuated or helium filled tubes, and control and dynamic performance tests. Using self-compensation to make it thermally insensitive, this design can be moved out of temperature controlled rooms to the factory floor. Lower mass improves the dynamic response, so measurements can be made faster, lowering inspection cost. Taken together, the impact of this project will be faster feedback on dimensional attributes of mechanical parts at the process, speeding up process improvements. ***