摘要
以典型方锥台件为成形对象,考虑了层间步距、板材厚度和工具头直径3个工艺参数,首先,使用Box-Behnken方法设计了15组实验,并使用超声波测厚仪获得成形件侧壁上沿深度方向的厚度变化趋势。测得的数据表明,在渐进成形过程中厚度变化并不是一直遵循正弦定律的,而是出现了过度减薄的现象。然后,应用响应曲面法建立了3个工艺参数与制件的最大减薄率之间的二阶响应曲面模型,分析了3个工艺参数独自及其相互作用对最大减薄率的影响。研究结果表明,最大减薄率随工具头直径的减小和步距的增大而增加,但受板材厚度影响较小。最后,以获得最大减薄率的最小值为目标优化工艺参数,得到了最优工艺参数组合:层间步距为2mm,板材厚度为1.27mm,工具头直径为10mm。研究结果对避免渐进成形件过度减薄及提高成形质量具有指导意义。
The effects of three parameters,stepdown,initial thickness and tool diameter,on the maximum thickness thinning in Incremental Sheet Forming(ISF)were studied.A total 15 sets of experiments for truncated pyramids were designed using Box-Behnken method.The change of the thickness along the depth direction was measured by ultrasonic thickness gauge.The measured data show that the thickness distribution in ISF process does not always follow sine law and the excessive thinning phenomenon occurs.The regression equation between the three parameters and the maximum thinning rate of the part was established using the response surface method.The individual effects ofthe three parameters and their combination effects on the maximum thinning rate were analyzed.Results show that with the decrease in tool diameter and the increase in the stepdown the maximum thinning rate increases,but the initial thickness has little influence on it.By setting the maximum response as the goal of optimization,the optimal condition is obtained with step size of 2 mm,sheet thickness of 1.27 mm and tool diameter of 10 mm.This research provides the guideline for avoiding excessive thinning and improving the part quality in ISF.
作者
李燕乐
陈晓晓
翟维东
孙杰
李剑峰
LI Yan-le;CHEN Xiao-xiao;ZHAI Wei-dong;SUN Jie;LI Jian-feng(School of Mechanical Engineering,Shandong University ,Ji'nan 250061,China;Key Laboratory of High Efficiency and Clean Mechanical Manufacture,Ministry of Education,Shandong University,Ji'nan 250061,China;National Demonstration Center for Experimental Mechanical Engineering Education,Shandong University,Ji'nan 250061,China)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2019年第2期529-535,共7页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金青年项目(51605258)
中国博士后科学基金项目(2016M592180)
山东省博士后创新项目(201701011)
山东大学基本科研业务费项目(2016TB006)
关键词
材料合成与加工工艺
渐进成形
最大减薄率
BOX-BEHNKEN设计
响应曲面法
工艺优化
material synthesis and processing technology
incremental sheet forming
maximum thinning rate
Box-Behnken design
response surface methodology
process optimization
