Research On Trajectory Planning And Machining Experiment Of Fast Tool Servo Turning For Curved Compound Eyes

Curved compound eyes lens are an important optical element of bionic compound eye system,which have many outstanding advantages,such as small size,light weight,large field of view,and high time resolution.Therefore,they have very important application in the fields of military,medical,aerospace,special target lanyard and uniform illumination.At present,the application of curved compound eyes gradually develops from the spherical base to the aspherical base,thus higher requirements are imposed on the ultra-precision machining of curved compound eyes lens arrays.Based on the above background,the researched object of this paper is the curved compound eyes with paraboloid base,and the trajectory planning,simulation and processing method of the fast tool servo turning for compound eye lens arrays are studied.Firstly,aiming at the structural properties of curved compound eyes,proposed the processing method of four-axis linkage rotary cutter.Secondly,performed the trajectory planning of fast tool servo turning for curved compound eyes.Thirdly,simulated the tool trajectory and three-dimensional morphology of curved compound eyes based on MATLAB software.Finally,processed and detected the aspherical base curved compound eyes.The main contents of the thesis include:(1)The first is the trajectory planning of curved compound eyes.According to the free-surface combination theory,the curved compound eyes lens arrays can be divided into the paraboloid base and the spherical base curved compound eyes lens arrays,and combined with the feed pattern and the positional relationship between the cutter contact point and the cutter location point to calculate the tool trajectory for the compound eyes of the paraboloid and the spherical base,respectively.Furthermore,the influence of the transition zone on the machining quality is further analyzed,and the optimization scheme of the tool trajectory of the transition zone is also proposed.(2)The second is the machining simulation of curved compound eyes.In order to verify the feasibility of tool trajectory planning,the tool trajectory and 3D morphology of the curved compound eyes are simulated based on MATLAB software.Firstly,the data points are discrete based on the mathematical model of the tool trajectory.Secondly,combined with the cutting parameters,tip radius compensation and the feed pattern,the tool trajectory and 3D morphology of the curved compound eyes are simulated.In addition,we also have optimized and analyzed the tool trajectory and 3D morphology in the transition zone.Finally,we analyzed the influence of main simulation parameters such as B-axis speed and sampling points on the processing quality.(3)The third is the processing experiment and testing of curved compound eyes.Through a series of experimental preparations such as tool setting,spindle assisted balance,machining parameter and curved compound eyes parameter design,PC and PMMA curved compound eyes were successfully processed,and the geometrical characteristics,surface roughness and optical quality of the processed samples were tested and analyzed.The results show that the curved compound eyes have good surface accuracy.Besides,the surface roughness of curved compound eyes is also satisfies the quality requirements of the optical element with good focusing effect and clear imaging.The experimental results verify the feasibility of the four-axis linkage rotary cutter machining method and the trajectory planning of fast tool.