Basic investigations on boundary lubrication in metal forming processes by in situ observation of the real contact area
Basic investigations on boundary lubrication in metal forming processes by in situ observation of the real contact area
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DOI：
10.1007/s11740-009-0198-5
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发表时间：
2010-05
期刊：
影响因子：
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通讯作者：
S. Weidel;U. Engel;M. Merklein;M. Geiger
中科院分区：
文献类型：
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作者：
S. Weidel;U. Engel;M. Merklein;M. Geiger
在金属成形工艺中，摩擦学对工艺可行性和工具寿命起着重要作用。边界润滑和混合润滑在金属成形过程中占主导地位。因此，出现的真实的接触面积主要受刀具和工件的形貌的影响，对摩擦条件具有重大影响。为了更好地理解工具和工件之间的界面处的摩擦，通过应用半透明工具来研究边界润滑条件下理想化微凸体的平坦化行为。已经使用了各种液体润滑剂。已经表明，某些润滑剂的使用导致粗糙体对扁平化的更高抵抗力，这将有利于减少摩擦。为了更深入地了解导致这种效应的机制，进行了地形分析和有限元模拟。研究结果已被转移到真实的地形与地面微镦粗试验。
In metal forming processes tribology plays a significant role for process feasibility and tool lifetime. Boundary and mixed lubrication conditions are predominant in metal forming processes. Hence the appearing real contact area which is mainly influenced by the topography of tool and workpiece has a major impact on friction conditions. For an improved understanding of friction at the interface between tool and workpiece, the flattening behavior of idealized asperities under boundary lubrication conditions is investigated by applying a translucent tool. Various liquid lubricants have been used. It has been revealed that the usage of certain lubricants leads to higher resistance of the asperity against flattening which would be in favor of reduced friction. Topography analysis and finite element simulations have been performed in order to get more insight into the mechanisms leading to this effect. The findings have been transferred to real topographies by micro upsetting tests with ground surfaces.