预应变对铝合金板冲裁断面质量的影响

Influence of pre-strain on quality of blanking cross section for aluminum alloy sheet

设计了9组不同工艺参数的冲裁试验,以研究冲裁间隙和冲裁角度对铝合金板冲裁断面质量的影响。随着冲裁间隙的增加,对断面质量起决定作用的光亮带比例逐渐减小,冲裁角度为10°时,光亮带比例相对较高。进而设计了不同大小和方向的单向拉伸和双向等拉预应变,通过试验研究预应变对铝合金板冲裁断面质量的影响。结果显示：预应变对断面轮廓影响不大,但使光亮带比例明显降低,且对AA5182光亮带比例的影响大于AA6016;在单向拉伸预应变方向为90°、大小为5%时,光亮带比例下降值达到最大,其中AA5182为17.51%,AA6016为8.76%;预应变方向对光亮带比例影响较小,为1%;双向等拉预应变使AA5182和AA6016材料的光亮带比例下降值均大于单向拉伸预应变,分别为18.27%和16.74%。

The blanking experiments with nine sets of process parameters were designed,and the influences of blanking clearance and blanking angle on the quality of blanking cross section for aluminum alloy sheet were studied. With the increasing of blanking clearance,the proportion of bright region decreases gradually which playes a decisive role to the cross section quality. When the blanking angle is10°,the proportion of bright region is relatively high. Furthermore,the uniaxial tensile and biaxial equal tensile experiments were designed under different values and directions of pre-strain,and the influence of pre-strain on the quality of blanking cross section for aluminum alloy sheet was studied by experiments. The results show that the profile of cross section is slightly affected by the pre-strain,but the proportion of bright region is obviously reduced,and the effect of pre-strain on the proportion of bright region of AA5182 is greater than that of AA6016. When the uniaxial tensile pre-strain is 5% in the 90° direction,the proportion of bright region is decreased to the maximum,namely,17. 51% for AA5182 and 8. 76% for AA6016. Besides,the proportion of bright region is slightly affected by the pre-strain direction which is 1%. Furthermore,for AA5182 and AA6016,the proportion of bright region under biaxial equal tensile pre-strain is reduced larger than that under uniaxial tensile pre-strain,which is 18. 27% and 16. 74%,respectively.