無軸折彎機(jī)構(gòu)的探索與研究
[Abstract]:In the basic industrial production, sheet metal bending machine is widely used. As the most important mechanism in sheet metal bending machine, the design and research of bending mechanism is of great significance to meet the diversified needs of manufacturing industry. Aiming at the shortcomings of traditional bending machine, such as single working form, low degree of automation and easily causing damage to sheet metal, a new type of shaftless bending mechanism is proposed in this paper. On the basis of the hinged six-bar mechanism, the simplified diagram of the new bending mechanism is established, and the simple model of the bending machine is established by using the three-dimensional modeling software. The working form and application of the mechanism are explained. In the theoretical analysis, the kinematics model is established by using complex vector method, and the kinematics performance of the bending mechanism at each position, such as trajectory, velocity, acceleration and so on, is deduced, and then according to the principle of Darembert, the kinematics performance of the bending mechanism is deduced. The dynamic static analysis of the mechanism is carried out, and the relationship among hinge point, barycenter coordinate and force is obtained. In order to obtain better bending effect, the trajectory of bending rotation point is taken as the objective function, and the coordinate of the relevant hinge point and the length of the rod are taken as the design variables, and the constraint conditions are established according to the practical requirements of the bending equipment. The parametric model of bending mechanism is established by using virtual prototyping technology, and the bar group of the mechanism is optimized. The optimized results show that the deviation of the x axis coordinate of the bending plate rotation point is within 0.4mm, and the influence on the bending effect can be ignored, and the y axis coordinate deviation of the bending plate rotation point is larger, the optimization result shows that the bending angle is 90 degrees, and the deviation of the x axis coordinate of the bending plate rotation point is within 0.4mm, and the influence on the bending effect can be ignored. However, the change of coordinate has little effect on bending effect and can be compensated by external method. According to the results of optimal design, the kinematics simulation analysis of the bending mechanism is carried out to determine the displacement, rotation angle, rotational speed and angular acceleration of each component of the mechanism under all working conditions, and the obtained data are analyzed. The dynamic simulation is used to determine the stress on the x axis and y axis, and the stress of each member is analyzed. Based on the above research, through theoretical analysis and mechanism simulation, the proposed new bending mechanism scheme is feasible and has significant advantages in bending expansion.
【學(xué)位授予單位】:浙江工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TG305
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