Development Of Match Grinding Test Workbench For Spool Valve Of Servo Valve In Simulation Working Conditions

During the processing of spool valve of servo valve, each edge of the spool valve overlap value requires match grinding. Match grinding processes include spool valve overlap value test and valve spool grinding. This paper adopts an new test method in simulation work conditions of spool valve of servo valve, which takes advantage of the hydraulic cylinder as the operating load of spool valve of servo valve, however the hydraulic cylinder works without operating load. This test method which can automatically switch the test valve mouth, can measure two edges of the spool valve overlap once, determining the value of grinding. At the same time, it can measure the total overlap value, reflecting the flow characteristics of spool valve on the whole. This test method for the development of the test technology of spool valve of servo valve and other hydraulic test has important significance.Firstly, analyzing and explaining the fundamental test theory to establish displacement and flow model, indicating the relation of displacement and flow is not linear when the valve mouth is small, this shows that data processing need avoid the small valve mouth. And analyzing the theory of the hydraulic cylinder simulating the work conditions of spool valve of servo valve, in the meantime, depending on the valve mouth flow, valve spool and test time to determine the main parameters of hydraulic cylinder. It can make an important guidance for designing the oil-way and selecting the hydraulic cylinder model.Secondly, designing all the parts of test workbench, which includes the hardware part and the test software. The hardware part mainly introduces the design concepts and the calculation processes of main parameter of all of the components, that includes the design of jig and hydraulic pump station and oil-way and manifold block and return oil system and electrical circuit, selecting the hydraulic pump and piping and the composition of computer data acquisition and control system. The test software mainly states each of the main modules for the programming method, that includes the main measurement program, stepping motor driver and subdivision technology, data acquisition and overlap calculation, and so on.At last, the experiment of single overlap value verifies repetitive measurement error below±0.5μm, and the result shows that test workbench can reach the production requirements. So the test workbench have an important significance for match grinding of spool valve.