An Adjustment Method of Geometry and Mass Centers for Precision Rotors Assembly

Chuanzhi Sun,Xiaoming Wang,Zewei Liu,Yongmeng Liu,Jiubin Tan

doi:10.1109/access.2019.2955124

Chuanzhi Sun, Xiaoming Wang + Show 3 more

Open Access

https://doi.org/10.1109/access.2019.2955124

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Abstract

The paper aims to provide an adjustment method to reduce coaxiality and initial unbalance for precision rotors assembly, such as aero engine, gas turbine and so on. The propagation process of actual geometry and mass centers is analyzed in the assembly. The coaxiality and initial unbalance are reduced by controlling the assembly angle of each stage rotor. The effectiveness of the proposed assembly method is verified through experiments. Experimental results show that compared with the direct adjustment strategy, the coaxiality and initial unbalance are reduced by 41% and 50% in four rotors assembly, respectively. The proposed method can be used to improve assembly accuracy, especially for multistage rotors precision assembly.

Highlights

In the field of advanced precision rotor manufacturing, such as aero engine, gas turbine and so on, the quality of rotors assembly has a great influence on the rotation characteristics [1]–[3]
This paper proposes a multistage rotors assembly method to improve the assembly quality
An adjustment method is proposed to minimize the coaxiality and initial unbalance in the assembly, which based on the actual geometry and mass centers

Summary

INTRODUCTION

In the field of advanced precision rotor manufacturing, such as aero engine, gas turbine and so on, the quality of rotors assembly has a great influence on the rotation characteristics [1]–[3]. The stage rotor can assembly straight using the proposed method, and the coaxiality and initial unbalance of final assembly are improved to satisfy with the requirements of precision assembly. The tolerance analysis and allocation methods were proposed to limit the assembly tolerance of component based on the geometric error model [17]–[19]. The initial unbalance is caused by the mass eccentric deviation propagates and amplifies in multistage rotors assembly. It is necessary to establish the coaxiality and initial unbalance prediction model based on the spatial error compensation characteristic and the deviations of final assembly are reduced stage-by-stage by controlling the assembly orientation for precise multistage rotors. An adjustment method is proposed to minimize the coaxiality and initial unbalance in the assembly, which based on the actual geometry and mass centers. The experimental results show that the coaxiality and initial unbalance are reduced significantly and the reasonable assembly orientation is obtained in four rotors assembly

ASSEMBLY MODELS OF COAXIALITY AND INITIAL UNBALANCE

COAXIALITY AND INITIAL UNBALANCE OF N ROTORS

ASSEMBLY STRATEGY BASED ON THE CONSTRAINED NONLINEAR PROGRAMMING

EXPERIMENTS

Findings

DISCUSSIONS AND CONCLUSION