Research On CNC Machining Technology Of The IMU Body In High-speed Milling Machines

Based on machining technology of high-precision parts with high-speed5-axisCNC machine, the modal analysis for IMU body was simulated using the UG modelingtechnology and ANSYS finite element analysis software. And the cutting process ofmetal was simulated with MSC.Marc analysis software for its capability to solve thenonlinear problems. Then the fixtures in the machining were designed for necessary.The machining parameters were selected reasonably in the process of design. Thehigh-precision processing method was proposed. The main research works were shownas follows：Firstly, the precision analysis of the IMU body was carried out, which contained allthe precision analysis for all the underside and the direct finished surfaces and thetechnical analysis with difficulties in the machining process. In order to satisfy theaccuracy of all the finished surfaces, the machining requirements were improved on theunderside with the manufacturability. Then the3D model and simplified model werecreated with UG software.Secondly, the finite element model of the IMU body was created with the softwareof ANSYS. The dynamics analysis of the FEM of the IMU body was carried on, fromwhich the natural frequencies and modes of the structure were calculated. The nonlinearanalysis for cutting process of metal was simulated with remeshing function ofMSC.Marc for further research. The process parameters in machining were evaluatedeffectively, which provided theoretical references for parameters selection in machiningprocess.Thirdly, two special fixtures were designed in machining. The sizes of fixtureswere designed reasonable by the space scope of5-axis CNC machine with the action ofturning and rolling and precision of parts. The interference analysis was carried on afterassembling the fixtures to ensure the practicality, succinctness, and safety.Finally, various error sources in machining process were analyzed. The errordetection and compensation of the machine were researched. The high-speed rotationdynamic balancing tool was selected in the machining process to avoid flutter of themachine. The cutting parameters in machining process, as well as the clamping and toolway were selected reasonably. Then the precision finishing of the parts were completed.As the results showed that, the part precision could satisfy the engineering practice, andthe improved methods were feasible.In summary, the dynamics analysis of IMU body structure, the simulation processof cutting, and the error analysis were researched in the paper. By selecting thereasonable machining parameters and machining methods, the workability and validityof the high-precision parts were validated, which provided the references and experiences for the machining of precision parts.