挤扭模通道倒圆角半径对铜合金塑性变形的影响

基于Deform-3D体积成形软件,对CDA110铜合金挤扭成形进行数值模拟,研究挤扭模通道横截面的不同倒圆角半径R值对坯料等效应变、挤扭力及模具应力的影响规律及变形均匀性;采用自行设计的倒圆角半径R=1.5 mm的模具,对该合金进行室温挤扭实验并与模拟结果进行对比分析。结果表明:R越小,挤扭力越大,模具应力分布越不均匀,挤扭剪切塑变能力越强;R越大,挤扭剪切塑变能力越差,但变形均匀性越好;优选倒圆角半径R值为1.0~1.5 mm时(挤扭模通道横截面尺寸10 mm×10 mm),可保证坯料挤扭强剪切塑性变形量,且挤扭力和模具应力显著降低。实验结果证实,合适的倒圆角半径R能确保材料整体细晶化,且不同区域材料硬度分布差距减小,变形均匀性增强。

纯铜挤扭工艺数值模拟与实验研究

运用有限元模拟软件Msc.Marc对纯铜挤扭工艺变形特征进行研究,分析挤扭变形过程中应变分布以及应变分量的变化趋势。采用自行设计的挤扭模具,在室温下进行了纯铜的一道次挤扭试验。结果表明:变形可分为变形开始、完全充满、逐步挤出3个阶段;应变呈中心低、边缘高的分布;变形过程中正应变分量小,切应变分量较大,变形以剪切变形为主。挤扭过程中存在滑移和孪生两种变形方式;挤扭后试样的硬度得到显著提高,在横截面呈现边缘高、中心低的分布趋势。

Three dimensional finite element study on torsion extrusion processing of 1050 aluminum alloy

The capability of the torsion extrusion （TE） process as a severe plastic deformation （SPD） method was compared with the conventional forward extrusion （FE） process. The TE and FE processes were successfully performed on AA1050 alloy samples at room temperature. To simulate the above mentioned processes, finite element analysis was carried out using the commercial elasto-plastic finite element analysis ABAQUS/Explicit Simulation. It is shown that load requirement for the TE process is lower than that for the FE process. The equivalent plastic strain calculated by the FEA proved that higher values of strain are imposed to the sample in the TE process. The strain distribution for the TE sample at the final stage of extrusion shows smoother strain gradient in comparison with the one produced by the FE process.