【作者】 张晨；

【导师】 莫健华；

【作者基本信息】 华中科技大学 ， 材料加工工程， 2013， 硕士

【摘要】 创建了伺服压力机常用的三种传动机构的数学模型，在此基础上，运用ADAMS软件对机构进行运动学和动力学性能分析，在综合对比中发现：三角连杆式传动机构虽然在滑块运行速度上相比其他两种机构有着不小的优势，但在动力学性能上略显不足，不能满足塑性加工工艺的需求，需要对其进行优化设计。传统的优化方法针对某种特定的加工工艺对传动机构进行优化，优化效率较低，难以满足现代制造加工业的需要。本文创新的提出在同一种机构的基础上，针对不同的加工工艺，设定不同的优化目标进行优化设计。在目标函数的建立上，创新的对滑块压力的测量值进行灵活运用，确定其最大值、平均值、最小值的最大化分别为冲裁、弯曲、拉伸等工艺的目标函数，并建立各工艺优化计算时的约束条件。对优化后的机构进重新进行参数化建模，并将其动力学和运动学性能与直连杆机构、曲柄连杆机构以及优化前三角连杆机构进行对比，在对比过程中发现：1.针对冲裁工艺优化后的三角连杆机构使滑块在下死点处能够对丝杆螺母处输入的压力放大倍数达到210倍之高，降低了在下死点处电机负载，使电机选型更加灵活。2.针对弯曲工艺优化后的三角连杆机构能够使滑块在距下死点80mm处开始持续输出同一水平的压力，并在下死点处压力放大倍数可达到约50倍，其代价是机构的运行速度的下降。3.针对拉深工艺优化后的三角连杆机构能够在更长的行程中稳定输出高水平压力，这对于拉深工艺来说，是非常有利的，同时，机构拥有在空行程中保持高速运动，从接近工件到开始拉深时逐渐减速等特性。在已有的优化结果的基础上，分析了各优化方案对塑性加工工艺的适应性和同比优势，并计算出各优化方案对伺服电机的额定转矩、最大转矩等参数需求，为伺服电机的选型提供参考。更多还原

【Abstract】 Create mathematical model of three transmission mechanisms which can becommonly used in servo press, based on these models, use ADAMS software to analyzethe kinematical and dynamic characteristic of the mechanisms. During the process ofcomparison, although triangular-link transmission mechanism has advantage on therunning speed of the block, the dynamic performance of it is not remarkable and evencannot satisfy the demands of plastic processing, it requires to be optimized.Traditional optimization method is just aimed at certain process and has a lowerefficiency of optimization, it cannot meet the needs of modern manufacturing. This papercreatively proposes a new method which is aimed at various process when doing theoptimization, it sets up with different objective functions when optimizing.When creating the objective functions, the use of the measure of the block pressurecan be flexible. Set the maximum, minimum and average of it as the objective functionsof blanking, bending and drawing respectively and build the constraints of eachmechanism.Parametrically remodeling the optimized mechanism and compare its kinematicaland dynamic performance with direct-link mechanism, crank-link mechanism andtriangular-link mechanism which is not optimized, the findings are as follows:1. The triangular-link mechanism which is optimized to suit the demand of blankingprocess can make the input pressure be magnify to210times at the bottom dead center aswell as reduce the load of the servo motor, as a result, making the selection of servomotor more flexible.2. The triangular-link mechanism which is optimized to suit the demand of bendingprocess can make the block output the pressure at the same level when it has a distanceof80with bottom dead center, it can also magnify the pressure of input at50times when it come to the bottom dead center, however, the running speed of the mechanism will beslow down as a cost.3. The triangular-link mechanism which is optimized to suit the demand of drawingprocess can make the mechanism output a steady high level of pressure during a longerdistance, it can be very good for drawing process, meanwhile, the mechanism can alsopossess the characteristic of high speed during the non-cutting stroke and graduallyreduction of running speed when getting close with the parts.Based on the existing results of optimization, analyzes the flexibility and advantageto other process. At the same time, figure out the rated torque and maximum torque ofservo motor, providing references of the selection of servo motor.更多还原