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首页> 外文期刊>塑性と加工 >Effect of inclusions on initiation and propagation of crack in small-hole punching of Fe-42%Ni alloy: Mechanism of burr formation in punching of metal sheet I
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Effect of inclusions on initiation and propagation of crack in small-hole punching of Fe-42%Ni alloy: Mechanism of burr formation in punching of metal sheet I

机译：Fe-42％Ni合金小孔冲孔中夹杂物对裂纹萌生和扩展的影响：金属板冲孔中毛刺形成的机理I

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The mechanism of burr formation in punching has been investigated with laboratory-produced Fe 42%Ni alloys which contain different amounts of sulfur, 0.001 and 0.008mass%. Cold-rolled 0.4mm-thick sheets were punched to form 0.4mm-diameter holeswith tools mounted in an instron-type universal testing machine. The cross sections of the specimens which were removed from the tools at various stages of punching were investigated by optical microscopy. Cracks are always initiated near the corner ofthe die and propagate toward the corner of the punch. In the alloy which contains 0.001mass% S, cracks do not propagate steadily and the material flow near the corner of the die after the initiation of the first crack results in a final large burr of thehole. In the alloy which contains 0.008mass% S, however, cracks rapidly propagate via MnS inclusions and only a small burr is formed. The geometric position at which the crack is initiated is predicted well from the distribution of hydrostatic stressanalyzed by visioplasticity.
机译：已经用实验室生产的Fe 42％Ni合金研究了冲孔中毛刺形成的机理，其中所含的硫的含量不同，分别为0.001和0.008质量％。用安装在Instron型通用测试机上的工具将冷轧的0.4mm厚的薄板冲孔以形成0.4mm直径的孔。通过光学显微镜研究在冲压的各个阶段从工具上取下的样品的横截面。裂纹总是在模具的拐角附近产生，并向冲头的拐角传播。在含有0.001质量％S的合金中，裂纹不能稳定地传播，并且在第一次裂纹产生之后，材料在模头拐角附近的流动会导致最终的大毛刺。但是，在含有0.008质量％的S的合金中，裂纹通过MnS夹杂物而迅速扩展，仅形成了小毛刺。根据通过粘塑性分析的静水应力分布，可以很好地预测开裂的几何位置。

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