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A Contribution to Determining the Friction Coefficient in Hydroforming of Tubes

机译：确定管材液压成形中的摩擦系数的贡献

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Hydroforming is a relatively new technology, which enables complex shaped hollow parts to be produced efficiently. Compared to alternative methods, this technology is characterised by significant potential advantages, such as complex shape production, lightweight design, high accuracy, and process integration. The tribological aspects of hydroforming are very significant, as friction influences all the main process parameters practically in a direct or indirect way. However, there is a paucity of information relating to hydroforming tribology. In most reports on this subject only qualitative data regarding the friction coefficient are given. However, for finite-element method simulation and optimal process and tool design, quantitative data are indispensable. This paper describes an attempt to determine the coefficient of friction in both the elastic and plastic states of a workpiece during tube hydroforming processes. Push-through tests were carried out in order to determine the coefficient of friction in the elastic state, and tube upsetting tests were conducted for the plastic state. Various commercial lubricants were used in the experiments.
机译：液压成型是一种相对较新的技术，可以使复杂形状的空心零件得以高效生产。与替代方法相比，该技术的显着优势是潜在的优势，例如复杂的形状生产，轻巧的设计，高精度和工艺集成。液压成型的摩擦学方面非常重要，因为摩擦实际上直接或间接地影响所有主要工艺参数。但是，很少有关于液压成型摩擦学的信息。在有关该主题的大多数报告中，只给出了有关摩擦系数的定性数据。但是，对于有限元方法仿真以及最佳的过程和工具设计，定量数据是必不可少的。本文介绍了一种尝试在管道液压成形过程中确定工件的弹性和塑性状态下的摩擦系数的尝试。为了确定弹性状态下的摩擦系数，进行了推入试验，并针对塑性状态进行了管up粗试验。实验中使用了各种市售润滑剂。

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