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Tribological Investigations on Tool Surfaces for Temperature-Supported Forming of Magnesium AZ31 Sheets

机译：摩擦压力成形镁AZ31薄板的摩擦学研究

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Aiming to decrease friction coefficient (μ) during the forming of magnesium alloy sheets, nine (9) tools with different hole geometries in their surface (flat, elliptical, and circular) were manufactured from steel Boehler W400 VMR (as known as DIN 1.2343). Tribological investigations were accomplished on a strip drawing machine at 288 °C without lubricants. When compared with a standard tool (surface flat), on average, tools with circular geometries in their surface showed the smallest friction coefficient, while tools with elliptical geometries shown higher. The friction coefficient also was confronted with the ratio between area occupied by holes in the surface of the tool and the total tool surface (i.e., factor f (%)), hole diameter (Ø), and the distance between circle centers (d(c,c)). Principal Component Analysis (PCA) complemented the experimental approach. In summary, both approaches (experimental and theoretical) indicated that the manufactured tool with circular geometries on its surface presented lower friction coefficient values on the forming processes of the magnesium AZ31 sheets.
机译：旨在减少在形成镁合金板期间的摩擦系数（μ），从它们的表面（平坦，椭圆形和圆形）中具有不同孔几何形状的九（9）工具（如DIN 1.2343所示）制成（平坦，椭圆形和圆形） 。在没有润滑剂的情况下在288°C的条带拉伸机上完成了摩擦学调查。与标准工具（表面平坦）相比，平均而言，其表面中具有圆形几何形状的工具显示出最小的摩擦系数，而具有椭圆形几何形状的工具更高。摩擦系数也面临着工具表面的孔和总工具表面（即，因子F（％）），孔直径（Ø）和圆中心之间的距离（D（ c，c））。主成分分析（PCA）补充了实验方法。总之，这两种方法（实验和理论）指出，在其表面上的圆形的几何形状所制造的工具呈现在AZ31镁片材的成形过程较低的摩擦系数值。

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