Spindle Rotor Dynamics Analysis For High-speed Winder

The spindle rotor is a vital component of the high speed winder on the chemical fiber spinning equipment. The performance of the spindle rotor determines the quality and efficiency of the yarn cake. This paper, taking the ZWT616 series winding machine and the 1680 mm length high speed spindle rotor as the research objects, analyses the sleeve assembly, key parts, supporting sleeve as well as the transmission shaft with the experimental modality analysis and the finite element modeling analysis, based on the theory of the modal analysis. Through this, this paper concludes the relationship of the assembly mode and its key components, finds out weak modal and adverse modal, and then comes up with some measures which can decrease the vibration of the spindle rotor.All of this would lain a foundation for the optimizing of the technology performance of the spindle rotor and can be a reference for the technological development of the high-performance spindle rotor.First, Comparing the two kinds of modal analyses, this paper finds the maximum error of the sleeve is 2.76%, the maximum error of the sleeve shaft is 7.43%, the supporting sleeve’s is 3.55% and the maximum error of the assembly when it is constrained is5.31%,which testifies the accuracy of the finite element model and its analyses.Then, analyses the relationship between the major parts modal and assembly mode of the spindle rotor. And finds out that the first order natural frequency of the spindle assembly is derived from the chuck, the second order natural frequency comes from the first order natural frequency of the sleeve, the third and the fourth order natural frequency stems from the second order natural frequency of the sleeve, the fifth order natural frequency is made out by the third order natural frequency of the sleeve, the second order natural frequency of the supporting sleeve and the first order natural frequency of the shaft.Finally, this paper analyses the weak modal and adverse modal of the spindle whenits working speed is in the range of 0 to 13000 RPM, which also means the working frequency is in the range of 0 to 216.67 Hz working frequency, and then put forward measures to decrease the spindle vibration according to the vibration control theory. The results show that the first four order of the spindle assembly is within the scope of the spindle working frequency, and their vibration mode is given priority to swung and they come from the sleeve, supporting sleeve and the chuck. In order to reduce the spindle vibration response and improve the performance of spindle rotor dynamics, the following measures should be taken: first, adjust the natural frequency and inhibit spindle vibration by reducing the quality of the sleeve, increasing the supporting stiffness and diminish the auxiliary air gap of chuck rotation; Second, improve the spindle dynamic balancing precision, reduce the unbalanced incentives and reduce the spindle unbalanced response.