An Experimental and Numerical Investigation of an Improved Shearing Process with Different Punch Characteristics

Mahmoud Gomah, M. Demiral
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引用次数: 6

Abstract

Blanking and piercing shearing processes have been widely used to manufacture workpieces for industrial, commercial and testing purposes. During the operation, the punch is exposed to higher stresses and, due to the cycled contact of opposite surfaces, it can be worn significantly. As its surface directly affects the quality of sheet products and causes some surface defects, its performance plays a significant role. In this study, various tools with different characteristics were investigated for an improved shearing process. First, a novel punch with a hemispherical ball at the centre of its flat face was tested and compared with a conventional one. The process was simulated using ABAQUS/Explicit finite element (FE) program, in which the Johnson-Cook material model with its complementary damage model was used to represent the behaviour of the sheet material. Based on this, an optimum geometry for the proposed punch was determined. Secondly, the wear resistance of TiN, CrN, TiSiN, AlCrN and AlTiN coated punches, produced with physical vapour deposition (PVD) technique, and of the polycrystalline diamond compact (PDC) cutter were compared based on scanning electron microscope (SEM) micrographs after 1000 strokes under dry cutting conditions.
不同冲床特性改进剪切工艺的实验与数值研究
下料和冲切工艺已广泛用于制造工业、商业和测试用途的工件。在操作过程中,冲床暴露在更高的应力下,由于相对表面的循环接触,它可以明显磨损。由于其表面直接影响到板材产品的质量,并造成一些表面缺陷,因此其性能起着重要的作用。在这项研究中,研究了不同特性的各种工具,以改进剪切过程。首先,对一种新型冲床进行了测试,该冲床的平面中心有一个半球形球体,并与传统冲床进行了比较。采用ABAQUS/显式有限元(Explicit finite element, FE)程序对该过程进行模拟,采用Johnson-Cook材料模型及其互补损伤模型来表征板材的行为。在此基础上,确定了冲头的最佳几何形状。其次,通过扫描电子显微镜(SEM)对比了物理气相沉积(PVD)技术生产的TiN、CrN、TiSiN、AlCrN和AlTiN涂层冲头与聚晶金刚石压片(PDC)刀具在干切削条件下1000次冲程后的耐磨性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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