Study On The Control System Of The Metalographic Sample Cutting Machine Based On IPC-PLC

Metallographic sample cutting machine is used for various physical and chemical testinglaboratory metallographic specimen interception, in mechanical manufacturing, colleges used widely.But at present, the cutting scope of domestic Metallographic Sample Cutting Machine is small and theautomaticity is lowly. It cannot directly carry on the sample to big components. The performance ofoverseas Metallographic Sample Cutting Machine’s is good and cutting scope is broad, but the price isextremely expensive. In order to meet the professional need researching on the large-scaleMetallographic Sample Cutting Machine is imperative. For the needs, the Metallographic SampleCutting Machine control system is researched and designed.According to the mechanism and the work principle of the large-scale Metallogaphic SampleCutting Machine, the control system has been designed with the thought of mechanical and electricalintegration. Programmable Logic Controller (PLC) is the heart of the control system. And IndustrialPersonal Computer (IPC) works as the input and the demonstration module. IPC is called HostComputer, which provides a person-machine intercommunication interface and carries on themonitoring and the management about entire system. PLC is also called Slave Computer whichexecutes a reliable effectively control on the spot. OMRON Host Link unit and the serial line are used inthe1:1interconnection system between IPC and PLC. The MSComm connection module of VisualBasic6.0is applied to the reliable serial port data communication.Frequency conversion timing technology is adopted to control the three posture asynchronismsmotor to attain stepless timing for adapting to request of cutting different materials. The mate speed ofthe grinding wheel and the real-time samples by photoelectric sensor function, using high-speed counterPID and PLC control simulation variables As a result, with the traditional PID closed-loop control thespeed of the grinding wheel is realized by the speed of the control precision is improved, the flexibilityof cutting different materials is to enhance and sample quality assurance. Three steps control motorrealized by PLC through three stepping motor drivers. The X direction step motor and the Y directionstep motor can make the working platform move smoothly according to the front or rear and the right orleft of settings peed. The Z direction step motor is utilized to move grinding wheel, the speed can be setaccording to sizes of the cut sample. PLC control stepping motor driver and three sensors, makeworkbench and grinding wheel, the task of cantilever can move in phase and cutting is finished.The automatic operation has four cutting modes: cut of workpiece once, cut of workpiece with Intothree and retreat one step, cut of workpiece layer by layer, cut of wokpiece in series. VB6.0development platform is utilized to design IPC display and input interface which provides the system with a simple, practical, safe and reliable person-machine interface. Control system Settings, adoptedelectrical equipment protection and circuit anti-disturbance measures, to ensure the safety and reliabilityof the operation of equipment. Using equipment for cutting experiment, carried out differentspecifications, different material types of samples from a lot of testing and accumulated a wealth of data,formed the conclusion. System to achieve the desired results verified goal.