摘要
针对成形过程模具的磨损剧烈,模具寿命低的问题,采用混合磨损模型对模具轮廓进行优化设计。以轮毂锻造成形过程中上模芯磨损为例,对上模芯轮廓进行分析,确定待优化的3个设计参数。根据黏着磨损、磨粒磨损及氧化磨损这3个磨损模型建立新磨损计算模型,并通过有限元软件数值模拟获取模具轮廓各处的磨损,以等磨损量作为模具轮廓磨损均匀的评判标准。在此基础上,以有限元软件数值模拟数据作为训练样本,采用BP神经网络建立上模芯轮廓设计参数与模具等磨损量的非线性映射关系。最后,结合训练好的函数映射关系和遗传优化算法,对轮毂锻模的上模芯进行形状优化设计,反求出磨损最均匀状态下的上模芯设计参数。研究结果表明:优化后上模芯等磨损量比优化前减少了29.65%,且最大磨损下降了12.59%,上模芯磨损更均匀且最大磨损量更小。
Aiming at solving problems of great wearing and low life of mold,the optimum design of die profile based on mixed wear models was used.As an example,the mandrel of wheel hub in forging process was studied,and the contour of mandrel was analyzed in order to select three parameters to optimize.Combined with three basic wear models,i.e.,adhesive wear,abrasive wear and oxidative wear,a new calculate model was established,and then wear value of the mold surface was obtained by forging numerical simulation and using uniformity wear which can reflect homogeneous degree of wear as judgment standard.On the basis of this analysis,the numerical simulation results were used as training sample to establish three layers BP neural network,and instead of the finite element model with trained BP neural network,the nonlinear mapping relationship between the design variable and the target function was acquired.Finally,combining the trained mapping function and genetic optimization algorithm,the mandrel shape of wheel hub and reverse parameters were optimized under the condition of the most uniform.The results show that after optimization of mandrel,uniformity wear value decreases by 29.65%and maximum wear value reduces by 12.59%than that before optimization,the amount of wear on upper punch becomes more uniform and the maximum wear is smaller.
作者
徐戊矫
刘承尚
马欣
郭子乾
陈菲
XU Wujiao;LIU Chengshang;MA Xin;GUO Ziqian;CHEN Fei(College of Material Science and Engineering,Chongqing University,Chongqing 400044,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第3期544-552,共9页
Journal of Central South University:Science and Technology
基金
中央高校基本科研业务费资助项目(CDJZR14130005
CDJZR13130087)~~
