Causes and solutions of power press shock

The power press is not well lubricated and the friction resistance increases when the table moves.When the motor is driven, the table does not move forward, which causes the ball screw to produce elastic deformation, storing the motor's energy on the deformation.When the motor continues to drive and the stored energy produces more elastic force than static friction force, the press table moves forward and moves in this way over and over again, resulting in a creeping phenomenon.However, this is not the case, a closer look at the guide surface lubrication, it can be concluded that this is not the problem.The creep and vibration of the press is a matter of speed.Since it is the speed problem to find the speed ring, the press speed adjustment process is completed by the speed regulator. 

The operation and monitoring of cnc power press is completed in this nc unit, which is the brain of nc punch.High machining accuracy, with stable machining quality;Carry on the multi-coordinate linkage, can process the shape complex parts;Machining parts change, generally only need to change the numerical control program, can save the production preparation time;power press itself of high precision, rigidity, can choose the favorable processing consumption, high productivity (generally for the ordinary machine tool 3~5 times).Speed - related problems, only to find the speed regulator.Therefore, the vibration of the press to find the speed regulator.Speed regulator failures can be found in the following places: one is a given signal, one is a feedback signal, and one is the speed regulator itself. 

power press because of vibration frequency and the motor speed with a certain ratio, first to check the motor fault, check the carbon brush and commutator surface condition, and the situation of the mechanical vibration, and to check the status of ball bearing lubrication and whole this check, but don't have to be removed entirely, can observe through the inspection officer, bearing can check with ears to hear voices.If there are no problems, check the speed generator.The speed generator is usually dc. 

The speed measuring generator is a small permanent magnet type dc generator, its output voltage should be proportional to the speed, that is, the output voltage and speed is linear relationship.As long as the speed is constant, its output voltage waveform should be a straight line, but due to the influence of the tooth groove and commutator commutator, a small alternating variable is attached to this line.For this purpose, a filter circuit is added to the speed measuring feedback circuit, which is to weaken the ac component attached to the voltage. 

The power press feedback signal is identical to the given signal to the regulator.Therefore, the fluctuation of the feedback signal must cause the speed regulator to adjust in the opposite direction, thus causing the vibration of the press.When this happens, it is very easy to deal with, as long as the back cover of the motor is removed, the commutator of the speed measuring generator is exposed.There is no need to do any disassembly, just use a sharp hook, carefully hook each trough, then use fine sandpaper to light the burr hook, the surface of the rectifier with anhydrous alcohol wipe, and then put the carbon brush can be done.Here special attention is to use a sharp hook to hook the slot between the commutator, do not touch the winding, because the winding wire is very thin, once broken can not be repaired, only to replace the winding.Do not use water alcohol to wipe, so finished insulation resistance can not be dried, so will delay the repair deadline. 

A closed-loop system may also be because of bad parameter setting and oscillation in the system, but method to eliminate the oscillation is the magnification, reduce it in FANUC system adjust RV1, inverse clock direction, then it can be seen immediately obvious better, but as a result of the RV1 adjust potentiometer range is small, sometimes don't come over, can only change the shorting bar, also is the removal of the feedback resistance, reduce the magnification of the regulator. 

Zaozhuang make machinery co., ltd., production of the power press are of good quality, we are committed to providing customers with better products and services, we have many types of punching machine for production such as JH21, JC21S, JB23, J21S, JC21, J21 serial open-style, etc, can satisfy the needs of different customers, welcome new and old customers to come to the choose and buy!