机械压力机连杆动态结构优化设计仿真

摘要

Taking the ten-bar linkage double action drawing press as the research subject,the motion loop mathematical model of the internal and external slider mechanism is built by using the closed vector method.To minimize the velocity fluctuation and acceleration of the slider in the compression zone,genetic operator algorithm based on the mutation probability is used to optimize the nine variables of the press.The kinetic curve analysis shows that,in the optimization design of the ten-bar linkage double action drawing press,the press velocity fluctuation and acceleration can be obviously reduced by increasing the depth weighted coefficient of drawing,which can acquire the better quality of the molding process,make the operation mechanism smooth,reduce the vibration,and improve the life of mould.%在多连杆机械压力机的设计中,杆系参数的确定是关键,为了解决传统单目标杆系参数优化设计中没有综合考虑到压力机滑块运动的速度、加速度对成型质量和模具寿命共同影响这一问题,以十杆机械压力机为研究对象,采用封闭矢量法建立了十杆机械压力机内外滑块机构运动回路的数学模型,以压紧区滑块速度波动量和加速度变小为优化目标,利用可变异概率的遗传算子算法对具有11个优化变量的十连杆机械压力机进行优化设计.通过动力学曲线分析表明,在十连杆机械压力机的遗传优化设计中,增加拉深深度加权系数获得的杆系参数可使压力机在可能大的拉深区间上内滑块的速度波动量最小,加速度明显降低,从而满足拉伸生产中既保证较好的成型工艺质量又能使机构运行平稳、降低振动、提高模具寿命这一目的.