The Control System Design Of 3-Coordinate Automatic Scribing Machine

In the machining process, often need a bench worker use scriber mark lines on the work piece to determine the processing location and inspection. It normally used vernier caliper, fitter disc, steel ruler, and other frequently used tools. The accuracy of this process will be directly affected parts machining accuracy. When parts are larger, have complex shape, the worker requires a higher degree of knowledge drawing capability. It is easily to result in low precision, low efficiency, greater labor intensity. What's more, high quality and automation have become its inexorable developing trend.With the development of CNC technology and motor drive system, CNC (computer numeric control) control system has become increasingly popular. To design 3D CNC machine replace the manual operate will help improve production efficiency and improve product's quality. NC-ASM(Automatic Scribing Machine)can be controlled by the main computer and PLC or joint control three coordinate axis automatic feed, automatic mark lines, but also to be completed cutting action.Take the studies of the large-scale NC-ASM as the turning point, solves the project problem emphatically, builds the solid foundation for the research of manufacture the higher precision measuring machine is necessity.The topic research is aims at the NC-ASM performance requirement, analyzes its work principle, the software function, the transmission system, the control system and so on. The design selects the peripheral equipment, like the controller, the servo electrical machinery and so on .Thus the realization scriber movement control function, reduces the labor intensity greatly, enhances the production efficiency and the industry product quality.This paper first analyzes the NC-ASM work principle and the movement control request, uses the integration of machinery system design methods, designed its overall modelling, the mechanism and the control system, chose the structure suited the scriber mechanism, designed examination and prevent collision structure, carried on the thorough comparison and the analysis in this foundation to the scriber movement control realization key technologies, has chosen the most appropriate plan and has given the detailed explanation, has formed the design proposal.Use programmable logic controller (PLC) as the core to send or receive the three-axis control signal and touch screen communication signal. Control system in accordance with the requirements of motion control based on centralized processing procedures, together with the motion controller, drives, servo motors and other peripheral equipment, has realized the three stepper motors output logic control, achieved the motion control functions. In order to improve the control accuracy, use high-precision rolling screw, encoders, and motion controller, to form closed-loop control circuit, realized the three coordinates(X, Y, Z) micro-feed and digital speed control. The use of multiple data interface dedicated motion controller to achieve line interpolation, circular interpolation, and ensure the system working smoothly, improve control precision and enhance the machine adaptability. Control system use touch screen as Human Machine Interface, designed operate and display interface, to achieve a variety of settings and control parameters dynamic display, enhance the system human-computer interaction capacity.Finally has carried on the summary, forecast three coordinate's scriber machine application and the improvement research.