A Coordinate Measuring Machine with Parallel Kinematic Structure

一种新的三坐标测量机的设计理念采用了一种新颖的并联运动结构，该结构提供了五个自由度来定位测量探头。它的结构是由两个共用一个碱的四面体组成的六面体。该装置的六个支腿是可伸缩管，其中包含激光球棒，通过球形磁接头连接在一起，以测量其延伸度。五自由度定位的六次测量的冗余将用于热环境的校准和补偿。六面体的设计也保证了更低的质量，这意味着改进的动态性能。研究问题包括：由连杆和磁接头组成的结构的精度和热稳定性评估，通过真空或充氦管驱动和输送计量用激光束，以及控制和动态性能测试。使用自我补偿使其热不敏感，这种设计可以从温度控制的房间移到工厂车间。较低的质量改善了动态响应，因此可以更快地进行测量，降低了检测成本。综上所述，本项目的影响将是在加工过程中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. ***