Study Of Spatial Cam Reducer And Development Of Its Design System

The reducer is an important transmission device for mechanical equipment,which is used to reduce the transmission speed,and increase the output torque,and is widely used in modern industrial machinery such as lifting transportation,aviation and metallurgical machinery.With the development of industrial technology rapidly,the traditional reducers have been unable to meet the requirements of various fields for high-precision,high-efficiency and high-reliability of the reducer.Therefore,scholars at home and abroad have been focusing on the study of new cam reducer in recent years.Based on the excellent kinetic characteristic of the spatial cam indexig mechanism,a kind of cam speed reducer is designed in this thesis.First of all,the power source,transmission mechanism and related accessories of the reducer are designed and selected;Secondly,the digital prototype of the speed reducer is established based on Creo 3.0 software,and its dynamics simulation is carried out;Then,the serial design aimed at the two types of cam speed reducer is completed;Finally,the development of a CAD system for the cam speed reducer is realized.The main research contents of this thesis can be summarized as follows:After the collection of large amounts of data for spatial cam mechanism,the research status of it in recent years is reviewed from the aspects of mechanism design,dynamic simulation,three-dimensional modeling and CAD/CAM system.The design theory of spatial cam indexing mechanism and spatial cam reducing mechanism is analyzed in detail by drawing on the achievements of previous researches.The further study focusing on the structural forms,main parameters,cam profile equations and pressure angles of the spatial cam reducing mechanism has been conducted,which lays a theoretical foundation for the development of the CAD system for saptial cam reducer.In this thesis,the methods and the general steps of parameterization are studied;the related knowledge and parameterization ideas of program parameterized design are introduced in detail.The parameterization of the two parts of the spatial cam reducer is realized,and the parameterization of the whole mechanism is completed.It lays the foundation for the establishment of three-dimensional model and serialization of the spatial cam reducer with different transmission ratios.According to the basic parameters of the spatial cam speed reducer and the design principle of the spatial cam reducing mechanism,the design and selection of the power source,transmission mechanism,and other accessories of the reducer are completed;the digital prototype of the spatial cam reducer is established by Creo3.0;Then the virtual prototype of the device is imported into the ADAMS software,and the multi-rigid body dynamics analysis is carried out,the movement curves,contact force and torque curves are output;Through the analysis of the simulation results,the parameters are adjusted accordingly,to obtain a spitial cam speed reducer with excellent dynamic characteristics.The theoretical knowledge of the product series design is understood thoroughly,and the serial design of two types of the spatial cam speed reducer are realized.The axial output reducer is designed with center distance as main parameter,the flange output reducer is with the worktable diameter as main parameter.Each type of cam reducer has a different model with different transmission ratio.The design idea of the CAD system of the spitial cam reducer is established.The development of the CAD system is completed by using Visual C++ compiler language and the secondary development tool Pro/toolkit,the computer aided design of the reducer is realized.Finally,the digital prototypes of different types of spitial cam speed reducer are established.