| The cover painting is a key step of the process in the automobile manufacturingprocess. At present, the key equipment of coating process still relies on imported,research to improve the automation degree of automobile cover painting and qualitycontrol techniques should be have the important theoretical and engineering value.This doctoral thesis in close connection with the Dongfeng Motor Corporation metalpaint profiling automatic electrostatic painting equipment development around theatomization mechanism of electrostatic spray coating and high-speed air-bearingturbine design, the spraying process parameter optimization and trajectory planningand other key technologies to carry out in-depth research and achieved as followsinnovative results:According to the fluid continuity and the equations of motion, establish themathematical model of the paint movement in the high-speed centrifugal spinningbell-cup to analyze the centrifugal motion law of the paint particles, describes theelectrostatic and centrifugal atomization mechanism and its influencing factors. Onthis foundation, there is constructed separation model of the respective componentsfrom the paint liquid which under the centrifugal force, and based on simulationresults, there is development of new type centrifugal spinning bell-cup; construct theatomization test device for centrifugal spinning bell-cup to verify the theoreticalsimulation results.Based on the traditional air floatation turbine structure characteristics, there is thedevelopment of new high-speed flotation turbine prototype, the prototype with threeradial support air bearings, optical fiber sensors detect the rotor speed, can effectivelyto improve the stability of the rotor was supporting stiffness and movement, andobtain the good application in the domestic automobile manufacturers.By air-bearing turbine radial and axial support bearing force modeling andsimulation, studied air painting static stiffness and throttle hole diameter and axial gapsleeve inner relationship, based on the stiffness analysis of high-speed spray turbinebearing structure optimal design method, this method can effectively improveair-bearing type spraying turbine system static stiffness. Combined with the prototypedevelopment and test, has formed a set of complete dynamic balance of rotor, the assembly process and performance evaluation standard.Design of metallic paint profiling electrostatic spraying system with five degreeof freedom, and successfully applied to the production for cab body painting. Solvesthe following key technical problems: Based on Siemens SCOUT software to generatethe interpolation curve, set up the mathematical relation model between movementspeed of each axis of automatic top machine and velocity of conveyor; based on theautomatic spraying process, put forward the overall design scheme of the distributedcontrol system, and the control system hardware configuration and communicationrelationship was established; establish the relationship between the movementvelocity of the spraying system with different freedom degrees and spray painting therelationship between overlapping, provides the theoretical basis for trajectoryplanning... |
