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Analysis of the friction behavior of DLC in warm bulk forming by using the ring compression test

机译：用环压试验分析DLC在温块成形中的摩擦行为。

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摘要

The reduction of die wear is an effective way to decrease costs within bulk forming processes. Therefore, specific tool materials and heat treatments as well as special coatings are used to prolong the lifetime of the tools. Diamond-like carbon (DLC) coatings show high hardness and superior frictional behavior. However, these coatings seem to be inappropriate for hot forming due to degradation processes at elevated temperatures. But for warm forming, due to the lower temperature input into the cavity, DLC might be an appropriate coating. Friction influences the shear stresses on the cavity surface and is therefore an important factor for reducing die wear. Hence, the analysis of the frictional behavior of DLC coatings within warm forming by using the ring compression test will be presented within this paper. An amorphous hydrogenated carbon coating and six metallic doped amorphous hydrogenated carbon coatings (Cr, V and W each in two variants) are compared to CrN and no coating. Firstly, nomograms are graphed by the use of finite-element-analysis. Thereafter two test series are carried out varying forming temperature and lubrication. The results show that DLC coatings with and without metallic doping are able to reduce friction in warm forming. Within the investigations, an amorphous hydrogenated carbon doped with 15% chromium shows the lowest friction factor and is able to reduce the friction factor compared to no coating by up to 64% within warm forming.
机译：减少模具磨损是降低整体成型工艺成本的有效方法。因此，使用特殊的工具材料和热处理以及特殊的涂层来延长工具的使用寿命。类金刚石碳（DLC）涂层显示出高硬度和出色的摩擦性能。但是，由于高温下的降解过程，这些涂层似乎不适合热成型。但是对于热成型，由于输入模腔的温度较低，DLC可能是合适的涂层。摩擦会影响型腔表面的剪切应力，因此是减少模具磨损的重要因素。因此，本文将通过环压缩试验分析DLC涂层在热成型过程中的摩擦性能。将无定形氢化碳涂层和六个金属掺杂的无定形氢化碳涂层（Cr，V和W分别有两个变体）与CrN和无涂层进行了比较。首先，通过使用有限元分析来绘制诺模图。此后，通过改变成型温度和润滑进行两个测试系列。结果表明，带或不带金属掺杂的DLC涂层都可以减少热成型过程中的摩擦。在研究中，掺有15％铬的无定形氢化碳表现出最低的摩擦系数，与无涂层相比，在热成型过程中，其摩擦系数降低了64％。

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