Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-08 , DOI: 10.1007/s11665-020-05062-8 K. Wang , G. Ayoub , A. Ilinich , G. Kridli
The stretchability and flangeability of sheared sheet metal in stamping are directly influenced by the trimmed edge quality. In this work, the effect of the trimming parameters on the edge quality was investigated using experimental and statistical approaches. The material of study was a 6xxx-series aluminum sheet. A digital 3D optical microscope was used to assess the quality of the sheared edge geometry by measuring several distinct trimmed edge geometrical features, namely rollover, burnish, fracture, and burr. The evolution of the sheared edge geometry was studied by changing four trimming parameters, namely clearance, offal support, lower tool sharpness, and upper tool sharpness. The sheared edge’s ability to stretch was assessed by measuring both the total elongation and the local strain of trimmed half dog-bone specimens tested under uniaxial tensile loading conditions. A generalized linear model regression was used to investigate the relationship between the edge stretch, edge geometry, and trimming process parameters. The burr size was found to be the most significant factor for predicting elongation, while clearance between the upper tool and the lower tool was found to be the most significant controllable regression variable. Furthermore, the use of high support was reported to decrease the sensitivity of the trimmed edge quality to the upper and lower tool sharpness.
中文翻译:
修剪工艺参数对剪切边几何形状和拉伸极限的影响:实验研究
修整后的边缘质量直接影响冲压时剪切金属板的拉伸性和凸缘性。在这项工作中,使用实验和统计方法研究了修整参数对边缘质量的影响。研究的材料是6xxx系列铝板。使用数字3D光学显微镜通过测量几个不同的修整后的边缘几何特征(即翻滚,打磨,断裂和毛刺)来评估剪切后的边缘几何形状的质量。通过改变四个修整参数,即间隙,内脏支撑,较低的刀具锋利度和较高的刀具锋利度,研究了剪切边缘几何形状的演变。通过测量在单轴拉伸载荷条件下测试的修剪后的半狗骨头样品的总伸长率和局部应变,来评估剪切边缘的拉伸能力。使用广义线性模型回归来研究边缘拉伸,边缘几何形状和修整过程参数之间的关系。发现毛刺大小是预测伸长率的最重要因素,而上工具和下工具之间的间隙是最重要的可控回归变量。此外,据报道,使用高支撑力会降低修整后的边缘质量对上下刀具清晰度的敏感性。和修整工艺参数。发现毛刺大小是预测伸长率的最重要因素,而上工具和下工具之间的间隙是最重要的可控回归变量。此外,据报道,使用高支撑力会降低修整后的边缘质量对上下刀具清晰度的敏感性。和修整工艺参数。发现毛刺大小是预测伸长率的最重要因素,而上工具和下工具之间的间隙是最重要的可控回归变量。此外,据报道,使用高支撑力会降低修整后的边缘质量对上下刀具清晰度的敏感性。