摘要
提出了要领设计的新概念， 即通过该环节为汽车覆盖拉延件成形的有限元模拟提供初始条件， 分析了要领设计的必要性和特点。提出将流入量 （从压料面下进入凹模型腔的局部材料线素长度） 作为衡量局部成形阻力的指标。通过人工神经网络由覆盖件侧壁高度得到局部流入量， 将其添加在拉延件轮廓 （在成品件上添加工艺补充得到） 外侧， 即得初始毛料外形。把拉延筋的设计原则转化为约束条件， 将遗传算法和神经网络用于拉筋及凹模圆角几何参数的优化设计。另外还阐述了特征建模、面向对象知识库的应用。
A new concept, essential technical design(ETD) for automobile stretching part which provides succeeding FEM simulation with initial conditions, its necessity and characteristics are presented. It is pointed out that length of flown in material (LFM), which flows into female die from underside of blank holder during forming, is an external index of local forming resistance. Local LFM can be got from the height of automobile panel wall with ANNs. The shape of blank can be obtained by adding the local LFM to the shape of stretching part, which is got by adding excess material to finial automobile panel; Moreover, by converting design principles to restrictions, genetic algorithm (GA) and ANN are applied to optimize the geometric parameters of drawbead and die corner. The application of feature modeling and object oriented knowledge base is also discussed.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
1999年第4期56-59,共4页
Journal of Mechanical Engineering
基金
国家 863 高技术计划资助
