Research On Stiffness Measuring Platform GCT-III For Precise Spring Element

Precise elastic parts are widely used as sensitive parts to gain feedback signals in the controlling instrument such as electro-hydraulic servo valve or the navigation system such as flexibleness gyro in the field of astronavigation, navigation and aviation. Their stiffness parameters directly correlated with the performances of corresponding system. Therefore, not only have a rather high standard been set for dimensional precision and geometrical precision of them, but also certain demands are made against theirs stiffness characteristic. Due to their complicated geometry, along with machining errors and changes of materials characteristic, it is impossible to gain the accurate values of the stiffness by calculation. So, measurement is the only way to assure the stiffness requirement in production. At present, as the production level is advanced with the technology of astronavigation and continuous development of aviation, higher accuracy and efficiency in measurement are demanded to meet them. Therefore, studies on the stiffness measuring of spring tubes, typical plastic parts, is of great importance in enhancing strength of national defense.This dissertation firstly summarizes the development of stiffness-measuring instrument for spring element, and sums up the current research status and problems in the stiffness measurement. According to the actual need, the measurement system adopts rationalization-design, changing the upload mode of mechanical accessory, reducing regulation-step in the process of measurement, enhancing repetitive accuracy of measurement; successfully develop rigid measurement system which can automatically upload multi-spot measurement and output rigid curve.Secondly, a detailed analysis and comparison between rigid measurement and traditional measurement have been made to discover corresponding relation, providing theoretical basis. Then a systematic analysis on rigid measurement error, finding the inducement and process of error, providing sound, scientific basis on precise elasticity component measurement technology and combing this rigid measurement of system, analysis systematic error of rigid measurement.At last, the corresponding relation and error analysis between rigid measurement system and original system data have been verified by a multitude of experiments. The rigid measurement system matches automatic precise elasticity component measurement very well.