新型压电式测力仪多功能静态标定平台的研制

Design of Multifunctional Static Calibration Platform for a New-type Piezoelectric Drilling Dynamometer

为了解决压电测力仪的静态标定,文中介绍了自行研制的高精度、高刚性静态标定平台原理与结构。该标定台垂直力、水平力均采用螺旋加载方式,力值大小由三级标准测力环直接读取;而扭矩的加载采用"力×力臂"法,通过平移两个水平加载机构形成力臂,同时产生大小相等、方向相反的两个力来实现。对该标定台进行精度和刚度实测,结果表明相关指标均达到了CIRP-STCC标准。无疑,利用该标定平台可完成单向、双向力传感器、三向压电式测力仪以及钻削测力仪的静态灵敏度、线性、重复性、滞后以及横向干扰标定。

In order to accomplish the static calibration of piezoelectric dynamometer, the principle and structure of a multifunctional high-precision, high rigidity static calibration platform is manufactured in this paper. The screw loading mechanisms are used to achieve vertical force and horizontal forces, and its value can be directly obtained by the standard measuring ring. The torque load adopts ＂foreexlever arm＂ law, that is, the two horizontal loading mechanisms are relatively shifted to form force arm, and at the same time two parallel forces that have the same magnitude and opposite directions are generated. After accuracy and rigidity experiments, the static calibration platform has reached the calibration standard stipulated by CIRP-STCC. Undoubtedly, the calibration platform can be used to calibrate unidirectional force, two component force sensor, three-component piezoelectric dynamometer and the drilling dynamometer, such as sensitivity, linearity, repeatability, hysteresis and crosstalk.