Investigation of the influence of material anisotropy on teeth excitation

声学优化是齿轮制造企业的当务之急。由于环境限制和舒适度要求，有必要遵守极限值。特别是对于结构轻量化的齿轮组，需要进行差异化优化。要认识到这一点，一个重要的途径是使用新的制造技术来减少齿轮啮合激励，从而获得更好的承载能力和理想的材料和部件性能。为此，本项目将详细研究牙齿制造所造成的影响，而重点将放在分析再生激光熔化和滚压牙齿上。渐开线齿形的滚压技术已经发展到了可以在动力传动中使用的水平。就制造业的影响而言，参考文献和自己的调查表明，滚齿比切齿具有更高的弯曲强度和疲劳强度。与此形成鲜明对比的是，几乎没有发表过关于滚动产生的牙齿的声学行为的知识。慕尼黑工业大学在20世纪60年代发表的一篇论文中指出，齿轮啮合激励除了取决于其他原因变量外，还显著取决于齿轮的纤维结构和齿面的表面质量。此外，在相关的技术文献中，有关于更好的光滑性这一主题的一般性命题，但这些命题并没有得到可靠的证明。因此，它们提供了一个深入研究问题的机会。所涉及的研究单位2已经拥有了从当前的DFG项目中产生的齿轮展成制造方面的经验，该项目涉及使用16MnCr5粉末生产齿轮，以将冷却通道集成到车轮结构中。此外，这种制造方法为齿轮的特殊几何形状提供了巨大的潜力，这些几何形状与声学和轻量化相关。该项目的重点是科学地验证滚压或滚压生产的齿轮比基于相同几何形状的切割制造的齿轮具有更好的声学性能。作为项目的一部分，财产变更的证据应该通过深入的基础研究来提供。必须在材料性能的宏观和微观水平上认识因果关系，并将其整合到计算模型中。该模型应考虑到不同的材料特性来预测齿轮的啮合激振。

The acoustic optimization has a large priority for gear manufacturers. Because of environmental constraints and comfort requirements it is necessary to observe limiting values. Especially for gear units with lightweight construction a differentiated optimization is required. To realize that an important approach is the reduction of the gear mesh excitation using new manufacturing technologies, which lead to better load capacities and ideal properties of materials and components. For this purpose the effects caused by the manufacturing of the toothings will be investigated in detail in this project, whereas the focus will be on analysing generative laser beam melting and rolling of toothings. The rolling of toothings with involute profile has reached a level of development, which allows the use of these toothings in power transmissions. In terms of the influence of the manufacturing bibliographical references and own investigations show, that rolled toothings have higher bending and fatigue strengths compared to cutted toothings. In contrast to that there is almost no published knowledge about the acoustic behaviour of toothings produced by rolling. Just one publication by the Technical University of Munich, published in the 1960s, describes that the gear mesh excitation depends in addition to other cause variables significantly on the fibre structure of the gear wheel and the surface quality of the tooth flanks. Furthermore in relevant technical literatures there are general propositions about the topic of a better smoothness, which are not proved reliably. For this reason they provide an opportunity of profound research issues. The involved research unit 2 has already experiences in terms of the generative manufacturing of toothings emerged from a current DFG project, which deals with the production of gear wheels using 16MnCr5 powder to integrate cooling channels into the wheel's structure. Additionally this manufacturing method offers a great potential for special geometries of the gear wheel, which are relevant for acoustic and lightweight reasons. The focus of this project is the scientific verification of a better acoustic behaviour caused by property modifications of rolled or generative produced toothings compared to gear wheels manufactured by cutting based on the same geometry. As part of the project the evidence of the property modification should be provided by intensive fundamental research. The cause-effect relationships have to be recognized in a macroscopic and microscopic level of the material properties and should be integrated in an calculation model. This model is supposed to predict the gear mesh excitation in consideration of the different material properties.