Precision Analysis And Experimental Research On The Press-fit Of Armature Components

The electro-hydraulic servo valve is the core component in electro-hydraulic servo system. It can achieve the conversion from weak electricalsignal to hydraulic signal. And armature components are the core of such aconversion structure. Armature components consist of armature, spring tube,flapper and feedback pole. Each has high machining and assembly accuracy dueto the important role in demanding. While, now the study in this part isrelatively poor in domestic. The rate of assembly success and assemblyefficiency is so low that it hinders the development of our country’s electro-hydraulic servo. So this paper does certain research to solve this problem.First of all, this paper summarizes the study on the armature componentsassembly; continues to achieve the processing, assembly and structuralimprovements on the basis of previous study; designs a simple and reliablecircuit; designs a software control system which has the function of autojudgment, intelligent speed adjustment, displacement compensation, variouspress-fit modes and so on.Secondly, by using theoretical analysis, the paper obtains the bodydeflection accuracy and table deflection accuracy in the process of armaturecomponents press-fit. Then author verifies the accuracy in experimental methods.After that, the paper analyzes the deformation error in the displacement sensorroof and in the collet of the body; obtains the displacement control error and thecorresponding error compensation law. After comprehensive analysis andimprovement, the press-fit systems meet the press-fit of the armaturecomponents.Thirdly, the paper analyzes the impact of the possible factors in thearmature components assembly precision and does quantitative analysis on eachfactor; does analysis on the fixture used for the press-fit of the armaturecomponents and does corresponding quantitative analysis on it. At the same time,author analyzes the maximum co-ordination angle and checks the strength of thespring tube under this condition.Finally, author does armature components press-fit experiments by using the developed press-fit system. Before press-fit, author does measurement on thespring tube and armature in the main form and position error, measures themating surface of the surface morphology. After press-fit, the same items aremeasured again. By comparing the differences about the main form and positionerror of armature components between the two stages, author verifies theprecision analysis theory which has deduced is right. At last, author gives sometargeted recommendations for assembly improvement of armature components.