摘要
为了确定铜母线连续挤压的扩展挤压能力与摩擦条件、坯料直径及腔体模具结构参数之间的关系,根据坯料在扩展模腔内的变形特点,将坯料扩展变形区划分为两个区域。通过对两个分区的上限进行分析,建立了腔体进料口处单位压力的数学解析式,编程求解得到了摩擦条件、坯料直径和产品宽厚对腔体进料口处单位压力的影响规律。结果表明:产品宽度变大,挤压力基本呈线性规律增大,产品厚度变薄会导致挤压力迅速增大;随着坯料直径的增大,挤压产品的最大宽度会明显扩大,最小厚度略有减小。以工模具的承载能力为条件,给出了不同直径坯料所能挤压的产品的规格范围。
In order to investigate the relationships among the expanded extrusion capacity of continuous extrusion for copper bus bar and the billet diameter, friction condition and structure parameters of chamber and die, the expanded deformation zone of billet was divided into two sub--zones ac cording to the deformation characteristics of billet in the expanded die chamber. The analytic equations about the unit force at the chamber inlet.were established by analysis with upper bound method. Laws about the effects of friction conditions, billet diameter, product width and thickness on unit pressure at the chamber inlet were obtained by programming calculation. The results show： the extru- sion force increases linearly with the increase of product width, and decreasing product thickness can cause the rapid increase of extrusion force; the maximum width of product can be expanded obviously and the minimum thickness can be thinner by increasing feedstock diameter; taking the carrying capacity of tools and die as conditions, the product standards that can be produced by different diameter feedstock are obtained.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2009年第12期1502-1507,共6页
China Mechanical Engineering
基金
国家自然科学基金资助重点项目(50635020)
关键词
连续挤压
扩展变形
铜母线
上限法
continuous extrusion
expanded deformation
copper bus bar
upper bound method
作者简介
宋宝韫，男，1941年生。大连交通大学材料科学与工程学院教授、博士研究生导师。研究方向为连续挤压技术。获国家科技进步二等奖1项、三等奖2项，省部级科技进步一等奖1项、二等奖2项。发表论文60余篇。
曹雪，女，1978年生。大连交通大学材料科学与工程学院助理工程师。
樊志新，男，1941年生。大连交通大学材料科学与工程学院教授、博士研究生导师。
刘桂林，女，1980年生。大连交通大学材料与科学工程学院助理工程师。
