Influence of shot peened surfaces on friction in hot forging
Influence of shot peened surfaces on friction in hot forging
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DOI：
10.1088/2051-672x/aae91c
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发表时间：
2018-12-01
影响因子：
2.7
通讯作者：
Lippold, L.
中科院分区：
文献类型：
--
作者：
Behrens, B-A;Lippold, L.
热锻操作中的模具受到由热载荷、机械载荷和摩擦载荷组成的复杂载荷组合。因此，与其他成形操作相比，热锻模具的使用寿命较短。由于模具在工艺链的生产成本中占很大比例，因此延长模具寿命是提高热锻操作效率的有效途径。由于没有理想的模具表面性能的先验知识，因此采用喷丸表面处理，以创建与机加工模具表面相比增强的摩擦学性能。喷丸是一种表面处理过程，可以重复和精确地调整形貌参数。在这项科学贡献中，该技术被研究作为一种方法，以提高热锻模具表面的摩擦学性能，从而减少摩擦和磨损。使用不同的喷丸介质对AISI H11热锻模具进行喷丸处理，形成具有不同形貌的模具表面。在环压缩试验中，使用水基石墨润滑剂在干燥和润滑条件下分析了喷丸模具表面的摩擦学性能。在润滑条件下检测到最低的摩擦，与初始光滑，unpeened模具表面相比，粗糙度略有增加的喷丸表面。
Dies in hot forging operations are subjected to a complex load combination consisting of thermal, mechanical and tribological loads. Therefore, hot forging dies exhibit short service life in comparison to other forming operations. An extension of tool life represents an effective way of increasing the efficiency of hot forging operations since the dies represent a large share of the process chain's production costs. Since there is no prior knowledge of ideal die surface properties, a shot peening surface treatment was applied in order to create enhanced tribological properties in comparison to machined die surfaces.Peening is a surface treatment procedure which enables a repeatable and accurate adjustment of topographical parameters. In this scientific contribution, the technique is investigated as a method to enhance tribological properties of hot forging die surfaces resulting in less friction and wear. Hot forging dies of AISI H11 were peened using different peening media creating die surfaces with varying topography. Tribological properties of the peened die surfaces were analysed in ring compression tests in dry and lubricated conditions using water-based graphite lubricant. The lowest friction was detected under lubricated conditions for peened surfaces with slightly increased roughness compared to the initial smooth, unpeened die surfaces.