| The hybrid-driven presses are driven by constant speed motor and servo motor throughthe synthesis of two-degree-of-freedom mechanism. The main power is provided by theconstant speed motor and regulating action is controlled by the servo motor, which makes thehybrid-driven presses have both advantages of traditional mechanical presses in thehigh-power, smooth movement, and have a controlled adjustable ability, which is flexible.They can achieve multiple sets of motion. Therefore, it does not need to change the geometryparameters of the mechanism. By using the programs which are used to control the servomotor movement, people can easily adjust the slider’s motion parameters, in order to meet therequirements for different products and materials processing technology.At present, many scholars made deep studies of hybrid-driven mechanism, such ashybrid-driven five-bar mechanism, hybrid-driven seven-bar mechanism. However, the studyof two-degree-of-freedom hybrid-driven nine-bar mechanism is relatively few. Basing onconfiguration synthesis of the two-degree-of-freedom nine-bar mechanism, this paper carrieson the related research and simulation analysis of the two-degree-of-freedom hybrid-drivennine-bar punching press mechanism. The main works are summarized as follows:Firstly, given the importance of the configuration of two-degree-of-freedomhybrid-driven mechanism, this paper carries on the configuration synthesis oftwo-degree-of-freedom nine-bar mechanism through permutations and combinations betweenthe open pairs of chains, and gets all kinematical chains of the mechanism. Then according tothe type of degree-of-freedom of the kinematical chains and hybrid-driven mechanismkinematical chains’ selection principle, the configuration of the hybrid-driven nine-bar punching press mechanism is obtained. The characteristics and practical applications ofdifferent configurations presses are introduced.Then, the paper establishes the positive and inverse kinematics analysis modelrespectively by using the method of vector analysis. After known constant speed motor andservo motor driving the crank’s motion parameters, the slider and the rest of links’ outputmotion parameters are gotten according to the positive kinematics model. Meanwhile, whenknown the parameter of constant speed motor driving one crank and the slider’ parameter, theparameters of servo motor driving another crank and the other links’ parameter are also gottenaccording to the inverse kinematics model. And last the paper has carried on the positive andinverse kinematics simulation of the punching press, and the simulation results show thehybrid-driven nine-bar punching press mechanism has good punching kinematicsperformance.Next, on the basis of kinematical analysis, the paper obtains the kinematical parametersof each link in the center of mass. Considering the inertia force and gravity of each link, thepaper lists the force and moment balance equations of each link and carries on static analysisfor dynamic of the hybrid-driven nine-bar punching press mechanism, and obtains outputpower of the constant speed motor and servo motor, and studies the distribution of the twomotors’ output power. And last the paper derives the dynamic equations of hybrid-drivennine-bar punching press mechanism by using of the Lagrange method and the Principle ofVirtual Work.Finally, the paper carries on the dynamic simulation of hybrid-driven nine-bar punchingpress mechanism. By using of the key technology of combined simulation based on ADAMSand ANSYS, the paper establishes the multi-rigid and rigid-flexible coupling virtual prototypemodels of hybrid-driven nine-bar punching press mechanism. These two models are carriedon simulation analysis, and simulation results between the two models are compared. As aresult, considering the flexibility of the bars in the rigid-flexible coupling model, elasticdeformations of the flexible bars affect the kinematical accuracy, and this illustrates thenecessity of bars as the flexible bodies. |
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