| RV reducers are widely used in national key development areas such as industrial robots,aerospace,weaponry and equipment.The machining accuracy of the coordinate holes of key components such as cycloids and planet carrier has a vital impact on the performance of RV reducers,and affects the comprehensive performance of precision machinery and equipment indirectly.However,the coordinate hole processing of the key components of the domestic RV reducer usually uses imported equipment such as highprecision coordinate grinders and high-precision boring-grinding integrated machine tools.The structure of imported equipment is complex and expensive,which restricts the localization process of indigenous RV reducers and the development of precision mechanical equipment.There is an urgent need for research on special processing equipment for the coordinate holes of the key components of the RV reducer.Depending on the model,the key components of the RV reducer are always evenly distributed with2 to 4 coordinate holes.The rotary table of the special plane does not require continuous indexing so that the special plane can use high-precision end-tooth disc for indexing.Therefore,focuses on the precision boring process of the coordinate holes of the key components of the RV reducers,a special CNC boring machine with the end gear disk as the core component is proposed in this thesis.The overall structure design and optimization of the special machine and the design of the electrical system have been completed.The relevant research results are of great significance to promote the localization of RV reducers and to provide ideas for the design of precision special boring machines.The main research contents of the thesis are as follows:(1)Based on the precision boring process of key component coordinate holes,the simplified structure and topological structure of the special boring machine are proposed.The geometric error model of the special boring machine is established using rigid body kinematics and homogeneous coordinate transformation,and the changing law of the degree of influence of the various geometric errors on the machining accuracy of the special machine are discussed based on the sensitivity analysis method.Aiming at the prevention of key geometric error elements,the end gear disk is clearly defined as the core component of the special machine,and the prevention method of the key geometric error elements is proposed.(2)Through the orthogonal experiment method,the optimal cutting parameters and cutting force of the special machine are determined,the three-dimensional model of the whole structure of the special CNC boring machine is established,the special highprecision rotary table and fixtures are designed,and the selection and verification of important components are completed such as the precision boring tool,linear guide,ball screws,trapezoidal screws,servo drives,etc.(3)Using finite element analysis technology,the static and dynamic characteristics of the special boring machine bed,headstock components and worktable are analyzed,as well as the static and dynamic characteristics of the whole machine,and the static stiffness and natural frequency of the special machine are obtained.(4)Based on response surface method and finite element analysis technology,the key dimensions of the special machine bed and headstock are optimized,which is brought into the whole machine for static and dynamic characteristics analysis to verify the optimization effect,and the multi-objective optimization design of the whole machine is completed.(5)According to the functional requirements of the special boring machine,the electrical control system of the special machine is developed,and the selection of PLC,travel switch,servo driver and frequency converter is completed.The main circuit and control circuit of the special machine are designed,and the control program of the PLC is finally completed. |
