Development Of An Automatic Grinding System For Servo Valve Spool Throttling Edge

The servo valve which has a small volume and higher precision characteristics is the key of the servomechanism which is the executing agency of missile flight control system,the difficulty of servo mechanism manufacturing technology is the servo valve。As the key component of the power stage of the servo valve,the overlap value grinding of spool and valve sleeve is the key process in servo valve manufacturing process which will affect the static and dynamic performance such as static wastage and pressure gain.At present servo valve’s overlap value grinding is mainly conducted on Studer S20 grinding machine and measured on overlap value test equipment by manual work and the processing efficiency and quality will rely on the operator skill levels and experience.This dissertation direct at the error of tool setting and axial dimensions and low efficiency,developed a closed-loop control system of spool axial grinding of the servo valve which is based on the acoustic emission technology and the theory of micro feed technology,and puts forward the method by using acoustic emission technology and uses piezoelectric ceramic to achieve the micro feed as the overall design scheme.It included mechanical system,electrical system,t the error analysis,etc.In the other hand,it analyzes the technical detail when developing this device.Then this dissertation introduces the overall designing scheme.In the part of design of mechanical system,the improvement design of micro feeding system micro driving taper includes driving source and the driver,and analyzes the hardware of the acoustic emission portion.In electrical aspect,according to the functions of all parts of the overall system,the circuit diagram and the controlling of serve motor motion and piezoelectric ceramic driving is designed,then the electric system is set up.Transporting the designed precision grinding closed-loop control system to the processing site,it’s installation and debugging are done in S20 grinder,then the delay and creep characteristics of piezoelectric ceramic have been analyzed and controlled,after that,finishing the acoustic emission of cutter error test experiment,through the experiment,finding the right tool clamping point,controlling cutter error in the allowed range,after completion of the work,the experimental verification of the overall system and the analyzed of experimental data has been done to validate the conclusion of this topic.