The application of PLC in sharpening stone superfinishing machine tool

The application of PLC in sharpening stone superfinishing machine newmaker welcome to e hall hall 8 machine accessories/other machine tool exhibition hall combination machine tools, special machine tool, mold engraving and milling machine, engraving machine, broaching machine,. 。 。 One, the introduction of previous oil stone superfinishing machine is controlled by relay, the control part element is more, huge volume, complex wiring, and the reliability is not high, often fail. In recent years, the automatic control level of machine tool industry in improving. Now decided to upgrade the oil-stone superfinishing machine, using PLC controller to replace the traditional relay control sequence, shorter working period, make the job more reliable, and simple programming and easy to diagnosis, strong anti-jamming capability. Second, the electric control oil stone superfinishing machine working principle is placed between two guide roller, the machining workpiece will be uniform to a fixed direction, superfinishing head vibration under pressure to friction surface at the same time, improve the roughness and the roundness of workpiece. Manually adjust the indicators of good machinery, with the rotary switch works to automatic adjustment, press the start button automatically, PLC is up and running, under program control, cooling after start-up guide roll to start rotating under the inverter stepless speed regulation control, start to machining. Machine is equipped with emergency stop and alarm functions, in the event of mechanical failure the user can easily press stop button to stop the machine tool movement; Due to reasons such as overload appear problem, will light up the lamp to remind the operator. 3, 1, the design of main circuit of the system hardware design guide roller adopts frequency conversion control, PLC control relay suck cooperation conditions for variable frequency control is turned, the guide roller speed control using simulated control potentiometer; Cooling pump is controlled by PLC contactor KM on and off to achieve the stop; The rise and fall of the oil stone by PLC control solenoid valve to achieve. 2, PLC controller system to purchase according to the requirements of system input and output points choose 20 points of mitsubishi PLC which can meet the requirements. Four, system software design 1, parts processing can be convenient for manual/automatic conversion, when switch spin to manual mode, automatic doesn't work, the system according to different manual control button on the operation panel to complete machine tool adjustment or manual processing; Similar switch back to automatic state, press the start button, PLC, according to the preliminary design meet the requirements of the process program is running. System flow chart shown in figure 1. Machine tool control system, the manual accounting for six input point, automatic adjustment of processing before or used for parts manual processing; Automatic control part involves 6 input point, for the program order of parts processing. Automatic control part of the distribution of the input and output points as shown in table 1 input device input address output device output overload protection QM X000 alarm lamp Y000 HL emergency stop SB1 X001 guide roll start KA Y001 reset SB2 X002 cooling start KM Y002 automatic start SB3 X003 rising oil stone YV Y003 automatically stop SB4 X004 earthing protection X005 automatic control program is shown in figure 2, in order to avoid the startup current shock, with time delay is 0. 5 s to avoid cooling pump and guide roller motor start at the same time. 2, fault detection and alarm circuit once a mechanical part or control circuit failure occurs, alarm light lit up, at the same time, oil stone up to avoid misoperation cause damage; After failure to remove, press reset button to clear the alarm. Alarm program is shown in figure 3. Five, the summary of PLC has the rich instruction set, programming is very flexible, control is very convenient. After the upgrade of ultra precision machine tool with PLC, the system hardware structure is simple, high degree of automation, high machining efficiency, convenient maintenance, greatly improve the reliability.
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