| Blank holding force is an important control parameter in sheet metal forming filed.In recent years, blank holding force control technology was one of the hot topic in thesheet metal forming filed. Servo drive technology has been successfully applied to themetal cutting manufacturing industry. Its application in the field of forming was aninevitable trend. In this paper, the compound servo drive blank holding forcecontrol system of the servo motor drive was carried out simulation analysis andexperiment research. There was an important practical significance to solve the variableblank holder force control problem in sheet metal deep drawing process and to realize theforming process of flexibility and automation.The flip chip die structure of the servo drive side pressing mechanism was carriedout multi rigid body dynamics and rigid flexible coupling dynamics simulation. Throughthe simulation results, we could seen that the rigid flexible coupling system model morerealistic processing conditions, proved that the structure design of the model is reasonable.Simulation analysis shown that the servo drive side pressing mechanism could realize thevariable blank holder force control during the sheet metal forming process.According to the character and functional analysis of the CNC system, the designof servo drive blank holding force CNC system hardware part adopted the open structureof "PC+motion control card". The hardware system mainly includes computer andmotion control card, servo motors and drives, sensors, and control circuit and so on.The system software was designed with the idea of modularization and the friendlyinteractive interface was designed by VC++6.0. Communication between the upper andlower machine was used with standard PCI bus communication. Motion control cardaccepted application command from the host computer, on the basis of the given motionmode, to complete corresponding real-time motion planning and send out acorresponding motion command to the driver.We designed and developed a linear interpolation decoding interpretation functionmodule, debugged the PID parameter of the numerical control system, and completed the constant and variable blank holder force loading experiment finally. The experimentalresults shown that the power of servo motor2kW could provide maybe less than200kNof the maximum blank holding force for the blank holding force control system. So themethod of using CNC servo drive to control the variable blank holder force was feasible. |
PDF Full Text Request