Design And Virtual Development Of Alternating Bend Machine For Plastic Material

Under the assistance of Gansu Talent Projects, and the academic team of Lanzhou University of Technology and the fund for special research, the virtual development of alternating bend machine was investigated for supplying a new blanking device.Begining with stress fracture, the research of the basic theory and principle of alternating bend device was studied, which based on crack technology. After completing the preliminary design for the alternating bend device's main body, the model and simulation of the cutting machine and rotating bend machine are followed. In this article, the mainly work and achiverment of this thesis as follows:Firstly, several common blanking models are introduced and compared in this thesis. Through analysising their characteristic,implementation methods and scopes of application, recommend their essential defect. Based on this, a new type of stress blanking method for plastic material which is alternate bending cutting model is proposed. Also, the basic theory and working principle are proposed.Secondly, according to the previous theory and the working principle of the alternating bending device, the cutting machine and the rotating bending machine, which are the mainly body of the alternating bending device, are designed. Utilizing Pro/E modeling software, the virtual modeling and virtual assembly of the alternating bending machine are developed; and, the flaws in the device are fixed through interference checking by the Pro/E modeling software.The digital models in the Pro/E are successful transferred to the dynamic simulation software ADAMS by changing the 3-dimension models into paraboloid models. As a result, the kinematics and dynamics simulation of the alternating bending machine can be performed. The dynamic analysis on digital models can be used to verify the mechanism motion principle and function, and the kinematical simulation of the models can be used to check mechanical components impact and interference as well as machine movement function. Furthermore, the results of the simulation and analysis of the models are displayed on the curve graph. Also, the rotate driving force is minified by optimizing the crank-slider's offset.Finally, the elastic static and dynamic model is established according to the static analysis of the spindle's structure, by using the finite element method. With the help of mode synthesis technique, the splindle's stiffness and models of vibration in different natural frequencies are obtained, as the natural vibration is used to analysis the structure, which may affect the spindle's dynamic properties. Furthermore, the spindle thermal analysis model was established; as a result, the spindle temperature field was analysised by using the finite element method. Finally, the optimization for the headstock was established by analyzing the resules.