Siemens S7 - The application of 300 PLC in biaxial plane grinding machine

Introduction biaxial plane grinding machine used in gear up and down two end face grinding, used to complete a first shaft surface grinding, the second shaft is used to complete another surface grinding, workpiece conveying, loading and unloading are done automatically. s7- 300 PLC is a powerful, reliable performance, strong anti-interference ability, highly integrated programmable controller, it is widely used in many industrial occasions. 2 2 electronic hardware system. 1 machine body deconstruction mechanical parts including feed conveyor belt, manipulator, up and down two grinding wheel shaft, two grinding wheel axis of rotation, up and down two workpiece axis, discharge conveyor belt, lathe bed, hydraulic system, cooling system and other auxiliary devices, as shown in figure 1. Figure 1 machine tool deconstruction of 2. 2 electric deconstruction electrical machine parts including s7 - 300 PLC, movomatic online detection system, PLC positioning amplification module, ac servo motor, servo motor drive circuit, Siemens mp370 man-machine interface, all kinds of monitoring to detect switch and other auxiliary electrical components. Two wheel axle, two grinding wheel axis of rotation, up and down two workpiece axis are driven by ac servo motor, two of the grinding wheel and shaft motor ( Digital) By PLC positioning module and servo motor drive circuit control to enlarge, other servo motor ( Simulation of) By the PLC analog output module and a servo motor drive circuit control, electric control deconstruction as shown in figure 2, PLC control system hardware configuration as shown in table 1. Figure 2 machine tool electronic control system of electric control box chart 1 PLC hardware configuration 3 analysis of machine tool process: the machine is used for two end face gear automatic grinding machine. This whole process can be divided into the following several parts: feed conveyor belt material, the material manipulator, grinding processing, loading and unloading workpieces feed conveyor belt feeding. The following detailed each part of the process. 3. 1 feed conveyor belt manual process put the workpiece on the feed conveyor belt to feeding conveyor belt sent artifacts to inlet, feed dog catch action, ensure feeding mouth only up to an artifact - artifacts to arrive at the loading port. 3. Manipulator arrive process workpiece feeding mouth up and down 2 - manipulator forward - manipulator fingers caught the artifacts - manipulator rise seized artifacts - manipulator back to next artifacts to feeding mouth, the manipulator to feeding position - manipulator forward - manipulator, he put down the artifacts - the manipulator fingers - manipulator back - manipulator return, ready for the next feeding. 3. 3 of grinding process on the workpiece axis artifacts to clamp device lift, compaction device forward to clamp device drops, confirm put in position to workpiece clamping, workpiece clamping device lift to clamp device back to measuring head is raised, he entered into the measurement to probe down online detection of workpiece machining allowance, grinding wheel rotation, cutting fluid to open to and reverse rotation of the cup grinding wheel, grinding wheel down to the point of coarse grinding, coarse grinder piece - fine grinder piece - polishing workpiece and grinding wheel, concerned about cutting fluid to stop rotating workpiece, the measuring head is raised - measuring head back - manipulator unloading workpieces. 3. 4 the feed conveyor belt arrived in blanking process workpiece entry to the feed conveyor belt conveyor belt with the workpiece forward to artifacts to blanking block device, blanking blocking action ( Ensure the feed cylinder push rod only up to a workpiece before) To artifacts to discharge before the cylinder push rod, the material cylinder, the workpiece to the next procedure. After four PLC software design details about machine tool processing technology, the next machine software system is introduced in this paper. The software system is divided into the PLC program and the man-machine interface configuration picture data, as shown in figure 3. Figure 3 PLC controller software deconstruction 4. 1 PLC program of PLC to realize all the machine function control requirements, including all the process described above, including PLC positioning module configuration data. Programs using step7 v5. 4 programming software implementation, a grinding control processes as shown in figure 4. Figure 4 control program process ( 1) Using positioning module configuration data and screw top encoder, combined with the servo motor control amplifier drive circuit, realize the precise positioning control of the two wheel up and down the shaft. The positioning module internal integration have similar 840 d numerical control system function, control of feeding shaft adopts the related numerical control parameters setting, coupled with the nc machining programming implementation. ( 2) Using the online detection probe feedback data calculation grinding capacity, the feedback data through movomatic controller output to the digital output of PLC digital input module, PLC so as to realize the real-time sampling of the data, and use the data set and the processing technology of data comparison, so as to realize function coarse grinding, fine grinding and polishing machine. ( 3) According to the set of data processing technology, the PLC through the analog output module, calculation of output analog to the servo motor drive circuit, control the turning speed of the grinding wheel rotating motor rotation and workpiece. ( 4) Based on the data block ( db) Save the machine set data processing technology to ensure that process data is not lost when the power to restart the machine. ( 5) Using mpi communication, the realization of mp370 and data exchange between PLC. 4. 2 man-machine interface program man-machine interface is mainly screen configuration data, combined with the function keys and operation panel button, switch, to quickly switch between scenes, and the related process parameter setting and adjustment.
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