六连杆机构锻机传动系统模型建立及其复合形法优化

Establishment of transmission system model of forging machine with six-linkage mechanism and optimization of compound shape method

为了进一步提高锻件质量,设计了一种三角肘杆运动驱动上、下连杆完成滑块运动的六连杆机构,并给出了运动学模型。采用经过改良处理的量纲转换函数加权和作为目标函数,有效地克服了加权因子难以选择的缺陷,构建了最优方案,为满足工程使用需求提供了可靠保障。设计了六连杆机构锻机传动系统多组杆参数,在对锻机传动结构、运动性能、冷温锻造工艺条件综合分析的基础上,构建机构工程化约束参数。研究结果表明:优化后,除最大加速度外,其他各项参数经过优化后均获得了显著改善,从而制得质量更优的锻件。滑块优化后的位移和速度曲线变化更平缓,同时显著缩短了回程时间。该六连杆传动结构有效地提高了锻机运行的稳定性,且易于应用推广,对锻压效率的提高具有一定的意义。

In order to further improve the quality of forgings,a six-linkage mechanism was designed,in which the upper and lower linkages were driven by triangular toggle to complete the movement of slider,and the kinematics model was given.The weighted sum of improved dimensional conversion function was used as the objective function,which effectively overcame the defect that the weighting factor was difficult to choose,and the optimal scheme was constructed,which provided a reliable guarantee for meeting the engineering usage requirements.A multi-linkage parameters were designed for the drive system of forging machine with six-linkage mechanism,and the engineering academic constraint parameters of mechanism were constructed based on the comprehensive analysis of the drive structure,movement performance and cold and warm forging process conditions of forging machine.The results show that only the maximum acceleration is the same after the optimization,and the other parameters are significantly improved after the optimization,so that the forgings with better quality can be made.After the slider optimization,the displacement and velocity curves change more gently,and the return trip time is significantly shortened.The six-linkage transmission structure effectively improves the operation stability of forging machine.The research is easy to be applied and popularized,and has certain significance to improve the forging efficiency.