| Mold polishing is one of extremely important steps in the process of mold processing,processing quality is one key factor that affecting the accuracy of mold surface, so one of themost effective ways to improve the quality of mold products is to improve the mold polishingprecision. At present, the mold polishing is mostly operated manually, so the polishing qualityand production efficiency is difficult to improve. Of course, some newly designed polishingmechanisms are not common in production because of less precision or high price. This paperdesigned a kind of polishing system with a Cartesian Coordinate Robot compliant mechanism.This system could automatically change the position of the polishing tool and posture accordingto mold surface curvature, to make the tool polishing at constant stress processing, by this wayto improve the mold surface accuracy and production efficiency.Considering the requirement of universality and the cost control, this paper designed anautomatic polishing system based on Cartesian Coordinator Robot. The whole control system isbased on the architecture of PC+PLC+HMI, using PC for interpolation and other complexcalculation, using the PLC output pulse to control positioning of servo motor, and touch screenof TPC1063H is used to monitor the movement process.The main research content is as follows:1. Design of the overall system architecture of compliant polishing mechanism. To satisfythe system functions and operation requirements, the system is based on the CartesianCoordinate Robot, using PC as upper computer, PLC as lower machine, and touch screen ashuman-machine interaction of hardware components. The System is mainly divided intofollowing parts: tool motion module, the teaching module, the rectangular coordinate robotcontrol module, PLC control module, human-computer interaction module and PC monitoringmodule. These modules cooperate to make the system being able to be taught and completeflexible polishing action.2. The control system design of three coordinate Cartesian Coordinate Robot motion. Themain function of Cartesian coordinate Robot control system is to finish the work of polishingtool positioning work and coordinate acquisition operation when working in the mode ofteaching.3. The teaching system of Cartesian Coordinate Robot. PLC is responsible for dataacquisition, then the data is transmitted to PC to be calculated and the calculated trajectorycoordinate are transmitted to PLC from PC through online communication, at last the PLCtracks the data transmitted to reproduce trajectory.The designed control system could guarantee the accuracy of the polishing tool with rightposture, position and suitable polishing force. Practical application showed that the designedcontrol system could meet the requirements of polishing system with high control accuracy andlow cost. |
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