Adapted surface properties of hot forging tools using plasma technology for an effective wear reduction
Adapted surface properties of hot forging tools using plasma technology for an effective wear reduction
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DOI：
10.1016/j.wear.2015.02.009
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发表时间：
2015-05-01
期刊：
影响因子：
5
通讯作者：
Behrens, B. -A.
中科院分区：
文献类型：
--
作者：
Paschke, H.;Yilkiran, T.;Behrens, B. -A.
热锻造过程中相互作用的高机械、摩擦学、化学和热循环载荷成分是与工艺有关的，作用与几何有关。为了提高成本效益，在加工过程中减少由于这些复杂的载荷状态而产生的磨损是一个很大的兴趣。本工作确定了锻模中不同的主要磨损机制，以及随后在不同模型试验配置中的抽象。因此，为了开发适合的部分结合PVD或PEVD硬质涂层的离子渗氮工艺，有效地降低塑性变形、裂纹和磨粒或粘着磨损等比磨损，有可能加强主要载荷成分。锻造工具一次表面形状的变化对磨损过程的发展至关重要。用阿伯特-费尔斯通图描述了这一点，发现岩心粗糙度S-k是一个合适的描述参数。因此，磨料抛光或剧烈喷丸等修整方法代表了进一步降低磨损的刀具强化。定义不同的刀具表面形貌，再加上通过硬涂层和/或附加扩散处理实现的刀具表面初始状态的稳定，是提高成形刀具耐磨性的一种非常有前途的方法。(C)2015爱思唯尔B.V.保留所有权利。
Interacting high mechanical, tribological, chemical and thermal cyclic load components of hot forging processes are process-related and acting geometrically dependent. To enhance the cost effectiveness, there is a big interest in reducing the occurring wear which is a result of these complex load regimes during processing.The presented work identifies the different main wear mechanisms in forging dies and the subsequent abstraction in the configuration of different model tests. Thus, an accentuation of the predominant load component was possible in order to develop adapted plasma nitriding processes partially combined with PVD or PEVD hard coatings to reduce effectively the specific wear like plastic deformation, cracking and abrasive or adhesive wear respectively.The change of the primary surface shape of forging tools was found to be essential for the development of the wear progress. This was described by using the Abbott-Firestone graph finding the core roughness S-k to be a suitable describing parameter. Thus, conditioning methods like abrasive finishing or severe shot peening represent tool enhancements for a further wear reduction.The definition of distinct tool topographies in addition with a stabilization of the initial state of the tool surface achieved with hard coatings and/or additional diffusion treatment is a very promising approach to enhance the wear resistance of forming tools. (C) 2015 Elsevier B.V. All rights reserved.