Due to poor lubrication, the frictional resistance of the table increases as the table moves. When the motor is driven, the table does not move forward, causing the ball screw to elastically deform and store the energy of the motor in the deformation. When the motor continues to drive, and the stored energy produces more elastic force than the static friction force, the punching table moves forward and moves in such a manner, resulting in creeping phenomenon. However, this is not the case. If you look closely at the lubrication of the rail surface, you can conclude that this is not the problem. Punch crawling and vibration problems are speed issues. Since it is a speed problem, we must find the speed loop. The entire adjustment process of the speed of the punch is done by the speed regulator.
The operation and monitoring of the CNC punching machine is all done in this CNC unit, which is the brain of the CNC punching machine. High processing precision and stable processing quality; multi-coordinate linkage can process parts with complex shapes; when machining parts change, generally only need to change the NC program, which can save production preparation time; the bed itself has high precision and rigidity. You can choose a favorable processing amount and high productivity (usually 3 to 5 times that of a normal machine tool). Speed ​​related issues can only be found in the speed regulator. Therefore, the problem of punch vibration is also to find the speed regulator. You can find speed regulator faults from one of these: a given signal, one is a feedback signal, and the other is the speed regulator itself.
Because the vibration frequency has a certain ratio with the motor speed, first check whether the motor is faulty, check its carbon brush, the surface condition of the commutator, and the mechanical vibration, and check the lubrication of the ball bearing. Inspection can be done without having to disassemble it. It can be observed by the inspector. The bearing can be inspected with the ear to hear the sound. If there is no problem, check the tachogenerator. The tachogenerator is generally DC.
The punch tachogenerator is a small permanent magnet DC generator whose output voltage is proportional to the speed, that is, the output voltage is linear with the speed. As long as the speed is constant, its output voltage waveform should be a straight line, but due to the influence of the cogging and the commutation of the commutator, a small cross variable is attached to the line. To this end, a filter circuit is added to the speed feedback circuit, and this filter circuit weakens the AC component attached to the voltage.
The punch feedback signal and the given signal are identical for the regulator. Therefore, the fluctuation of the feedback signal occurs, which inevitably causes the reverse adjustment of the speed regulator, which causes the vibration of the punch. When this happens, it is very easy to handle. As long as the motor back cover is removed, the commutator of the tachogenerator is exposed. At this time, you don't have to do any disassembly. Just use a sharp hook, carefully hook each slot, then use a fine sandpaper to light the burrs, rub the surface of the rectifier with anhydrous alcohol, and then put on the charcoal. Brush it. Special attention should be paid here when using a sharp hook to change the slot between the pieces, do not touch the winding, because the winding wire is very thin, once it is broken, it cannot be repaired, only the winding is replaced. Do not use a water-based alcohol to wipe, so that the insulation resistance can not be dried, which will delay the repair period.
A closed-loop system may also cause system oscillation due to poor parameter setting, but the best way to eliminate this oscillation is to reduce its amplification. Adjust the RV1 in the FANUC system and turn it counterclockwise. It will obviously become better immediately, but because the range of the RV1 adjustment potentiometer is relatively small, sometimes it can not be adjusted, only the shorting bar can be changed, that is, the feedback resistance value is cut off, and the magnification of the entire regulator is reduced.
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