摘要
为探究温度在改善6061铝合金精冲质量时的作用,通过单向拉伸试验获取6061铝合金在不同温度条件下的应力-应变曲线,然后结合单拉试验和有限元模拟,确立了断裂阈值与温度的关系,并将温度耦合到Normalized Cock Croft-Latham准则中,利用有限元模拟软件分析对比不同温度条件下6061铝合金精冲过程,最后利用精冲实验对模拟结果进行验证。结果表明,升温延缓了断裂的产生和扩展,25℃时精冲剪切区几乎完全断裂,而175℃时剪切区裂纹仅在凹模刃口附近产生,凸模附近尚未产生裂纹;随着温度的升高,精冲件断面质量改善,光亮带厚度从25℃时的1.53 mm上升到175℃时的3.02 mm,断裂带厚度从25℃时的3.68 mm下降到175℃时的2.06 mm。
In order to explore the influence of temperature on improving the quality of fine blanking part produced by 6061 aluminum alloy,uniaxial tensile tests were carried out at different temperatures for aluminum alloy 6061 to obtain stress-strain curves,and the relationship of fracture threshold with the temperature was established by combining results of uniaxial tensile tests and finite element simulation. Then,temperature is coupled to Normalized Cock Croft-Latham fracture criterion,and the warm fine blanking processes of aluminum alloy 6061 at different temperatures were analyzed by finite element simulation. Finally,the simulation results were verified by fine blanking experiment. Results show that raising temperature can delay the generation and extension of the fracture. Sheared zone of fine blanking breaks completely at 25 ℃,but at 175 ℃ cracks only generates around cutting edge. Therefore,the quality of shear cutting surface improves with the increase of temperature. Thickness of clean cutting surface increases from 1. 53 mm at 25 ℃ to 3. 02 mm at 175 ℃,and that of rough fracture surface decreases from 3. 68 mm at 25 ℃ to 2. 06 mm at 175 ℃.
出处
《锻压技术》
CAS
CSCD
北大核心
2016年第8期35-39,共5页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(51475296)
关键词
6061铝合金
精冲
断面
光亮带
撕裂带
aluminum alloy 6061
fine blanking
shear cutting surface
clean cutting surface
rough fracture surface
