Study On The High Speed Spindle Online Dynamic Balancing Vibration Signals Dealing And Regulation Basing On LabVIEW

The high precision,high speed and intellectualization of the high-end CNC machine tools are important symbols of the development level of machine tool technologies and equipment manufacturing industry.Spindles are the key parts of machine tools.The high speed spindle vibration caused by unbalance is the main factor that contributes to the spindle lower rotating precision and damage.Even under high rotating precision,there are still reasons such as design,manufacturing,wear,load impacting that damage the original balancing state.By applying the online dynamic method,the spindle vibration could be online monitored and the unbalance could be eliminated.It takes an important meaning to carry out the online dynamic balancing method which keep the spindle rotating rightly,running smoothly and working safely.The thesis focuses on solving two problems.One is the high spindle accuracy caused by noise and vibration.The other is the wrong regulation,long balancing time problem caused by unreasonable device path movements.The thesis concentrates on electromagnetic ring built-in online dynamic balancing device system and motor driven mechanical balancing device online dynamic balancing system.The main contents of this thesis includes:(1)Online dynamic balancing signals vibration and analysis basing on LabVlEW software.Firstly,noise deducing,vibration signals filtering were pre-processed.Secondly,vibration signals sampling,quantization and interception were post-processed.Finally,base frequency vibration signals amplitude and phase were extracted by using different signals extraction methods.Through experiment verification and comparative analysis,the optimal vibration signal amplitude and phase extraction method was selected.(2)Study on the spindle online dynamic theory.Influential factors were analyzed which were respectively speed,trial weights and phases.Aiming at achieving online dynamic balancing accurate control,calculation and compensation to the spindle unbalance were done.(3)Study on the high speed spindle online dynamic balancing experiment and influential factors.Results showed that basing on the Sy104h-llathe spindle,the vibration amplitude decreased by an average of 86.72%and the balancing accuracy was improved greatly.By verifying factors such as spindle speed,trial weights and locations.Results showed that the spindle speed range at 1800r/min had great influence on the experimental platform vibration.The experiment verified that the change of vibration amplitudes and trial weights placement directly affected the influence coefficient and indirectly affected the online dynamic balancing effects.The larger the influence coefficient,the more obvious the reduction held.The spindle speed fluctuation also affected the spindle dynamic balancing system.Improved trial weights empirical formula.By verifying the feasibility and accuracy of the mass block movement path,the optimal mass blocks strategy was selected.The fault regulating problem was solved and the long lasting balancing time was cut down.