The Study Of Fast Measuring Technology For The Axial Mate Dimensionn Of Valve Spool And Valve Sleeve Of The Servovalve

Hydraulic servo valve is a key part of the hydraulic servo system that is widely used in aerospace industry,which determines the success or failure of the aircraft mission for the most part.As the most important parameter of the servo valve,overlap values play a key role in determining the performance of the servo valve.Therefore the measurement and processing of overlap values become the most important production process in the whole process of servo valve.The traditional machining and measurement method of verlap values aims to obtain the highest precision to meet the high performance requirement of servo valve,with the rapid development of aeronautics and astronautics,the production efficiency of servo valves with high performance has been unable to meet the increasing demand for servo valves.Under the condition that the measurement precision of verlap values can meet the performance requirement of servo valve,the production efficiency can not be improved by improving the precision.Therefore,the development of a rapid measurement equipment has been an urgent need to improve the efficiency of the servo valve production.At the same time,it is required that the measuring device has the possibility to be used in conjunction with the fixture in the machining center,which will provide technical accumulation for the realization of verlap values unmanned NC machining in the future.This dissertation designs a measurement principle based on formula method,adopting differential solenoid inductor,and measuring device for automatic signal processing system,to achieve rapid measurement of servo valve overlap.This paper focuses on the principle analysis of the formula method to measure the overlap,the design of inductance probe and the verification test of device performance.Based on the measuring principle,measuring principle formula method is put forward.Through the establishment of the mathematical model and a combination of fluent simulation,error theory of measurement methods is analyzed,and is verified by experiment,so as to determine the measurement range and accuracy of measurement based on the theory.On the basis of the measurement method,a fast measuring system of axial fit dimension of servo valve is developed.The system adopts differential solenoid inductor displacement sensor,which can realize the requirement of rapid measurement and also has high precision and linearity.Using keyboard to control processing system based on single chip microcomputer,and complete data acquisition,processing and display in the measurement process and then print the measurement result,measuring time and date.The servo valve axial fit dimension measuring device developed in this paper is 5μm in accuracy.On the basis of this equipment,the precision of the probe is verified by designing experiment.On the basis of verifying that the precision of the probe fully meets the design requirements,a comparative experiment was conducted to measure the overlap of the measuring equipment.Through the experiment,it was verified that the measuring precision of the whole equipment could meet the requirements,and the measurement efficiency could be greatly improved in the process of the servo valve overlap grinding.