Research On Valve Core Grinding Technology Based On Valve Hole Measurement

The integrated transmission device is the core component of military armored vehicles,and the spool is one of the core components of the hydraulic components of the transmission device.The clearance precision of the valve body and the valve body will directly affect the working stability of the hydraulic system of the transmission device.In the spool processing process,if the use of valve hole and spool cylindrical processing technology,the efficiency will be greatly improved,but the valve hole manual detection efficiency is low,precision is not high,valve hole measurement data and the actual value under the working state is not consistent with the problems resulting in the spool automation matching to achieve.In view of the above problems,this paper carries out research on the grinding technology of the slide valve core based on the measured data of the valve hole.Relevant research is expected to solve the bottleneck of the grinding process and improve the technical means and technological capability of the manufacturing process of the valve core.The main research work of this paper is as follows:(1)After analyzing and comparing the advantages and disadvantages of common aperture measuring instruments and measuring methods based on the characteristics of grinding,select the electronic plug gauge that can quickly and conveniently obtain the measurement data of valve hole.Starting from the circular profile of the valve hole,this paper discusses several evaluation methods commonly used at home and abroad to study the characteristic structure,and how to selectively apply these evaluation methods to the solution of the valve hole diameter,so as to provide a high-precision data source for the subsequent spool grinding.(2)data measured under free state valve hole,with the actual working condition is different,lead to valve hole measurement data cannot be used directly,in this article,through 3 d software for valve hole and the valve core 3-d modeling,based on the principle of finite element analysis,physical field coupling analysis model is established,the heat flow through the Ansys workbench platform-solid coupling numerical simulation,give full consideration to the actual working conditions is the oil pressure,temperature,the influence of bolt pre-tightening force,valve core and valve hole is obtained under actual working condition fit clearance variation.(3)The spool and valve hole in the actual working state deformation,and due to the spool machining and installation errors resulting in the spool has a radial imbalance force,the spool is prone to hydraulic clamping.In this paper,the row was simulated and analyzed based on Fluent software,and solid Work software was used to establish clamping models of seals with different gaps.Finally,the effectiveness of setting a pressure equalizing slot to reduce radial imbalance was verified through simulation results,and the optimal shape and size of the pressure equalizing slot was obtained.(4)to complete the valve core structure parameters inversion and valve core processing technology is analyzed,and the nc program,through the CNC grinding machine for processing,inversion of the valve core at the same time,in order to avoid because of top caused by the bending deformation of valve core loads result in difficult control of valve core size and accuracy of cylindricity and customize the constant-voltage tailstock,achieve top tension automatic control.The assembly of the processed valve core and its matching valve hole has been completed.The experiment shows that the valve block can work normally,and the rationality of the technology has been verified.