摘要
利用实验研究和数值模拟分析相结合的方法来研究厚度为0.2 mm以下纯铜薄板的微拉深成形工艺及模具设计。通过一系列几何尺寸相似的杯形件的微拉深实验获得实验数据-成形力曲线;利用数值模拟研究了摩擦系数μ、相对模具间隙C/t和相对凹模圆角半径Rd/t对最大成形力的影响。研究表明,对最大成形力而言,摩擦系数μ的影响最为显著,而相对模具间隙C/t和相对凹模圆角半径Rd/t的影响在制造误差范围内不明显。在考虑摩擦条件的尺度效应的情况下,无量纲设计方式是一种比较有效的微拉深工艺及模具设计方法。
Micro deep drawing characteristics and die design of thin copper foils with the studied by experimental investigations and Finite Element Analysis. Micro deep drawing of three different cup sizes for punch force curves was done. Numerical simulations were used to study the influence of friction coefficientμ and devia- tions of process-determining geometric factors, e. g. , the relative tool clearance C/t and relative die radius Rd/t, on the micro deep drawing process for producing cups of 5 mm in diameter and 0. 1 mm in thickness. The results show that friction coefficient μ can have a decisive influence on maximum punch force and the deviations of die geometry within the given manufacturing tolerances have an inconspicuous influence on maximum punch force. If taking size effect on friction into account, the dimensionless design method for micro deep drawing process and die is valid.
出处
《锻压技术》
CAS
CSCD
北大核心
2007年第4期57-61,共5页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(50275059)
关键词
微拉深成形
尺度效应
无量纲设计
摩擦系数
micro deep drawing
size effect
dimensionless design
friction coefficient
