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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.
In order to analyze the deformation and fracture mechanism of the center metal during the process of two-roll oblique rolling, the technology of perforation deformation was established.The distribution of the deformation in the cross-section of the round billet was studied.Based on the reasonable research method reflecting the deformation characteristics of the two- The deformation of W-shaped distribution along the cross-section diameter was established experimentally by experiment, namely: 1. The distribution of deformation strength along the billet section is inhomogeneous and W-shaped. The deformation strength of edge layer and center layer Which is larger than the transitional layer. 2. With the increase of the diameter reduction, the non-uniformity is increasing. 3. Before the cavity is formed, the center metal has undergone obvious plastic deformation. The cavity cracking is a ductile fracture.4. The results obtained by the method are similar.