工艺参数对铝合金微槽道挤压成形的影响

将热处理后的1050铝合金拉伸试样进行等温拉伸试验，获得真实应力-应变曲线，使用Deform-3D软件模拟1050铝合金微槽道的挤压成形过程。分析挤压速度、摩擦因数以及槽道宽高比这些关键工艺参数对材料等效应力-应变曲线分布的影响。结果表明，随着挤压速度和摩擦因数的增大，材料等效应力和应变均变大，变形不均匀性增大；随着槽道宽高比的变大，材料的等效应力和应变整体呈现上升趋势，微槽道板筋处出现了明显的应力集中现象，变形不均匀。根据模拟结果，选取最优参数进行1050铝合金微槽道挤压成形模拟试验，结果显示材料的流动均匀性更好，成形过程更加稳定，所得零件表面精度显著提高。

Effect of Process Parameters on Isothermal Extrusion Forming of Aluminium Alloy Microchannels

The 1050 aluminium alloy were subjected to isothermal tensile test in order to obtain the true stress-strain curve. Deform-3D were used to simulate the extrusion process of 1050 aluminium alloy microchannel. The effects of extrusion speed, friction coefficient and channel width-high ratio on the equivalent stress-strain distribution of the material were analyzed. The results show that the equivalent stress-strain of the material become larger and the deformation unevenness increases with the increase of extrusion speed and friction coefficient. With the increase of width-height ratio of channel, the equivalent stress and strain of the materials show an upward trend, and clear stress concentration is observed at the rib of the microchannel plate with uneven deformation. According to the simulation results, the optimum parameters were selected to simulate the extrusion forming of 1050 aluminium alloy microchannel. The results indicate that the material shows better flow uniformity of the material, the forming process is more stable, and the surface precision of the obtained parts is remarkably improved.