为了分析二辊斜轧穿孔时中心金属的变形和裂断机理,确立穿孔变形的工艺实质.研究了圆坯斜轧时断面上变形的分布.采用反映二辊斜轧变形特点的合理研究方法,通过实验确立了沿断面直径上变形强度呈W形分布并不断加剧的规律,即: 1.沿圆坯断面上变形强度的分布是不均匀的,呈W形.边缘层和中心层的变形强度比过渡层为大. 2.随直径压下量增加,其不均匀性不断加剧. 3.孔腔形成前,中心金属业已发生明显的塑性变形.孔腔开裂属韧性断裂. 4.采用不同试验方法所得结论相似.
The distribution of deformation in the section of tube rounds during Man-nesmann piercing has been experimentally studied with a view to establishing itsmechanism. It was shown: 1. The distribution of the intensity of strain across the diameter of a tuberound is inhomogeneous with W-shaped. The intensity of strain on the sur-face layer and centre layer is stronger than that on the intermediate layer. 2. Its inhomogeneity increases during the process. 3. Distinct deformation at the centre of the tube rounds has taken place be-fore the cavity occurs, so that the fracture is tough. 4. It is proved that the results obtained by adopting three experimental meth-ods are very alike.
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