The action flow of the profiling lathe is as follows: the main motor of the oil pump starts, the tailstock is forward, the upper tool holder is in the original position, the lower tool holder is in the original position, and the spindle is turned to the upper knife. The cutter is pressed by a knife. The tool holder enters the end point limit switch and presses the lead, the knife returns to the return of a knife. The copy tool holder rewinds the upper knife holder. The tool holder advances into the end point. The limit switch is pressed into the knife holder. Retract the tool holder in-situ one spindle stop, brake tail frame backward button one tail frame back 2PI especially control system hardware and software design According to the analysis of the action sequence of the profiling lathe, the number of points input/output can be basically determined.
We use the Japanese Mitsubishi Fl-40MR PLC machine. 1 is the PLC input address and field control situation comparison table; Table 2 is the PLC output address and the field situation comparison table. The above-mentioned input points are 2 points. The control of the tailstock adopts the combination method of the input points, which reduces one input point, that is, controls the forward and backward of the tailstock with one button.
In the transformation, two functions of imitation knife suspension and accident (retraction) were added. In the automatic work, pressing the imitation knife pause button stops the contouring tool holder from feeding or retracting, and then can test the work. For the solenoid valve, the PLC output direct drive mode is adopted, and the power supply is DC 24V. In order to suppress the influence of the arc generated when the circuit is disconnected, the freewheeling diode is connected in parallel at both ends of the solenoid valve coil, and the parallel resistance of the two ends of the AC inductive component is connected. Absorption circuit.
1Pl machine input address and on-site control situation comparison table PLC machine on-site PLC machine site X fork) upper tool holder in-situ X accident retraction knife X4{)1 upper tool holder end point X501 oil pump button X] 2 lead knife origin X2 tailstock Button X4D3 guide knife end point X5 (j3 lower knife holder switch X spindle jog X5 (only lower tool holder home position X45 stop button X505 lower tool holder end point X la automatic / adjustment X15 lower knife holder forward X la) 7 imitation knife pause X57 Lower tool post back x410 copy knife forward xslo lower tool holder stop X41 copy knife back x51X412 lead knife forward button XS2 main motor button X413 automatically start X513 table 2 PLC machine output address and site situation comparison table PLCIY430 site situation y month 31Y32Y433Y month C Electric control tailstock 1, °C electric control guide knife 4YC electric fast 2 °C electric on the knife holder into the 3, °C electric on the knife holder back IOWC electric on the knife holder into the work 1, °C get electricity The knife holder retreats 12, °C is powered, the lower knife holder retreats sl, the electric spindle rotates, 53 the electric spindle, the brake oil pump motor starts the spindle motor start Page2
Conclusion After the transformation of the profiling lathe, it has been running for more than one year. There is no malfunction, the reliability of the electrical control circuit is greatly improved, the maintenance time and cost of the equipment are reduced, and it is more suitable for batch processing. Therefore, it is an effective method to transform the old machine tool with PLC.
(Finish)
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