| With the rapid development of space science and technology,the requirements for harmonic reducers with compact structure,small volume and light weight are constantly increasing.At present,the manufacturing level of short harmonic reducer of domestic manufacturers still has a certain gap compared with foreign countries,and cannot meet the huge domestic market demand for robot precision reducers.Therefore,this subject aims at the difficulty of designing and manufacturing short harmonic reducer,and the problems of poor performance.A harmonic reducer is designed using carbon fiber reinforced polyetheretherketone composite materials,and research on the key technical performance of the peek-based composite material harmonic reducer are carried out by using the finite element method.The main research content of this paper is as follows:Firstly,the tooth profile of the rigid wheel is designed based on the principle of harmonic drive meshing and tooth profile envelope,and the two-dimensional and threedimensional models of the short harmonic reducer are established.The finite element space modification design of the flexspline tooth profile was carried out,and the kinematic finite element model of the short harmonic reducer was established.On this basis,the influence law of flexspline structure parameters on the deformation stress of flexsplines made of different materials is studied.Based on the single factor analysis,combined with the finite element simulation experiment and the response surface method,the optimal fitting model of the maximum deformation stress of the flexspline is established,and the structural parameters of the flexspline are optimized by using the response surface model.Secondly,based on the kinematics finite element model of the short harmonic reducer,the calculation and analysis of the key technical performance of the harmonic reducer made of different materials are carried out.On the calculation results of kinematic analysis,the modal analysis model of the harmonic reducer and the flexspline components was established,and the calculation and analysis showed that the PEEKbased composite harmonic reducer has better damping characteristics.Based on this,the finite element simulation experiment calculation and analysis of the transmission performance of the harmonic reducer made of composite materials is carried out;the results show that although the CF/PEEK composite harmonic reducer sacrifices part of the transmission accuracy,it has a higher fatigue life and good carrying capacity.Finally,based on the principle of heat transfer and finite element analysis technology,the thermal and structural direct coupling analysis of the CF/PEEK composite harmonic reducer is carried out.The frictional heating phenomenon of the heat-prone components of the harmonic reducer,the flexible spline,the flexible bearing,and the complete machine in service is studied.The results show that although the CF/PEEK composite reducer has the problem of heat concentration at a single point,it has good temperature rise performance as a whole. |
