Research On The Influence Of Manufacturing Error Of Mounting Edge Of Bolt-stop Connection On The Assembly Performance

The high-pressure compressor is the core component of the turbofan aeroengine rotor system.In the complex rotor structure,a large number of bolt-stop connection structures are used.Its characteristic is that the stop cooperating structure plays the role of centering and positioning,and the bolts are used for tightening.The role of fastening,and the high-pressure rotor in the high-speed,high-pressure,high-temperature operating environment,the assembly quality of the rotor is extremely high,which directly affects the operational stability of other rotor components based on the high-pressure compressor assembly,and even causes the engine Operation failure,which puts forward higher requirements for the design and assembly of the bolt-stop connection structure.In response to the above problems,this article takes the assembly of the disc connection structure of the high-pressure rotor system of a certain type of turbofan engine as an example.The six-stage disc,the seventh-stage disc,and the eight-stage disc of the high-pressure compressor are connected in series by bolts to manufacture the rotor.Errors and assembly process errors are introduced into the rotor assembly process simulation model and the rotor concentricity degradation process simulation model under high temperature to study the influence of manufacturing parameters and assembly process on the rotor concentricity.First of all,this article combines the features of the flange face of aero-engine rotor bolts,and studies the method of expressing and reconstructing the measured end-face runout data and radial run-out data to quickly construct a three-dimensional profile feature model.A multi-bolt finite element model with a spigot structure is established,and the spigot thermal expansion and contraction interference fit method is used to study the influence of the manufacturing error of the spigot cylinder on the assembly deformation,and then to explore the shape and interference of the spigot cylinder The law of influence on assembly accuracy.The bolt group tightening process and the typical fitting state of the connecting surface have been explored to influence the assembly accuracy,and the influence of the tightening sequence and tightening step length on the bolt pre-tightening force or the installation edge stress distribution is analyzed to obtain the optimal tightening sequence and tightening.The process combination of the step length,and the influence of the manufacturing error of the typical bonding surface end face on the concentricity is studied,and the experimental data processing and simulation results are used for comparative analysis and verification.In addition,the statics operation results are transferred to the dynamics module to study the influence of the preload force and the end jump data of the real contact surface on the frequency and mode shape.This paper carried out the research on the design of the assembly process of the high-pressure compressor,built a comprehensive test platform for the aero-engine rotor bolts and the spigot connection process,and studied the influence of the bolt connection process parameters and the spigot connection process parameters on the joint surface and the assembly performance of the assembly.The influence mechanism of manufacturing parameters and assembly process on assembly errors is improved,and a forward design method for assembly process parameters of the connection between the high pressure compressor discs is formed,which provides theoretical guidance for improving the assembly accuracy of the rotor.