Design And Simulation On Combined Transmission Of Index And Swing Based On Globoidal Cam

The manufacturing industry embodied one country's productivity,and the development of automatic productivity line will contribute to the later improvement of manufacturing industry.Mechanical transmission part as the main body of the production line,is bound to be up to higher standard in transmission speed,accuracy,degree of automation.Due to the requirements of the production process,the mechanical transmission part often needs to achieve the cyclical index and swing action,etc.However,the existing transmission device or mechanism can only achieve a single indexing or swing action,which needs to be controlled separately and the transmission accuracy is poor and the entire transmission system is too complex to in compliance with the requirements of modern manufacturing integration and is doomed to be eliminated by the market gradually.In view of the present situation,this paper presents an index and swing combination transmission device to be applied in the automatic production line on the basis of the existing cam mechanism,which is mainly elaborated from the following aspects.(1)Build up a mathematical model of the globoidal cam.Based on the characteristics of the ruled surface of the roller trace of the globoidal cam and the characteristics that it is offset surface of its actual profile,we proposed the method of using the offset surface method to establish the cam surface profile equation and made equation derivation of work profile and research on pressure angle and curvature characteristic.At last,we designed an example to prove the correctness of the model,which greatly simplified the cam profile analysis and solution process.(2)We designed an index and swing combination transmission device based on the globoidal cam to replace the traditional intermittent mechanism which can only realize the single movement.In order to meet the large swing angle between the two processes in the production line,the design of transmission device was made of an globoidal cam mechanism with 180 degree swing angle.At last,taking the LED splitter as the design example,we calculated all sizes of the transmission device.(3)The existing modeling methods of globoidal cam are summarized and analyzed,the modeling of the globoidal cam is carried out by the method based on the offset surface principle.After creating the physical model of each part of transmission device,the established component models are assembled according to the previous design in the Pro/E assemble condition.After confirmation,device engineering drawings are generated in order to reflect the structure of the transmission device more clearly.(4)Dynamic simulation of the transmission device.Firstly,we made tests on the angular displacement,angular velocity and angular acceleration of the rigid multi-body model of the device in ADAMS software.The analysis of simulation results showed that the design and modeling process of this device were correct.After that,we made modal analysis of the drive shaft in ANSYS software and mainly introduced the flexibility process of the drive shaft,and then the driven shaft was introduced into the ADAMS to build up the rigid and flexible coupling model.The angular acceleration of the output end was selected as the research object to carry out the dynamic simulation and verify whether the device meets the design requirements.