Controlling of the friction in lubricated systems through Multi-Scale texturing with laser interference texturing and micro coining

通过激光干涉纹理和微压印的多尺度纹理控制润滑系统中的摩擦

• 批准号: 200417205
• 负责人: Professor Dr.-Ing. Gerhard Hirt
• 金额: --
• 依托单位: Lehrstuhl für Funktionswerkstoffe
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/200417205?language=en
• 关键词: Controlling; friction; lubricated; systems; through

A tailored surface pattern can reduce friction and wear in lubricated machine parts and thus lead to increased efficiency and service life and reduced lubricant consumption. The shape, size and spacing of such a structure are specific to each tribological system, hindering any generalised statement as to optimal parameters.In the first funding period structures were produced on flat surfaces by means of laser interference, micro-embossing and a combination thereof (multiscale structuring) and characterised with a lab tribometer. The investigations show that under hydrodynamic or mixed lubrication, laser-textured surfaces with a cross pattern increase the lubrication film lifespan and reduce wear, as do hemispheric embossed structures in boundary or mixed lubrication regime.In addition to tribocontacts, surface structures can also be used outside of the contact, to carry lubricant to the contact zone or to prevent it from leaving the contact. For applications with high pressures the fine structures would thus be protected and deficient lubrication could be avoided. Preliminary studies showed that such textures (especially multiscale) specifically affect the wetting and spreading behaviour and allow the control of passive lubricant transport.Taking into account the preliminary investigations, the objectives of the research proposal can be defined as:1. Transference of the acquired knowledge and the proven enhancements in planar surfaces concerning the use of multiscale structures to an application with curved cylindrical surfaces (i.e. plain bearings).2. Investigation of the influence of surface structures (laser, embossed and multiscale) on the passive transport of lubricant as a result of surface topography, as a function of a temperature gradient, as well as the application of the findings (i.e. rolling-element bearings).In this sense, test set-ups to structure cylindrical surfaces will be designed and tested. Simulations will be performed to interpret and analyse of the forming process. The surface of the prepared samples, i.e. the shaft sleeve of a plain bearing, will be topographically (shape and roughness) and microstructurally (SEM, EBSD, TEM) characterised. The tribological examination of the samples will be under a service contract at the IME at Aachen University (RWTH).For the investigation of the passive lubricant transport, simulations and basic experiments will be conducted on flat textured surfaces to validate the model and determine a shortlist of structures. Promising structures will then be applied to a machine element and tribologically examined.

定制的表面图案可以减少润滑机器部件的摩擦和磨损，从而提高效率和使用寿命，并减少润滑剂消耗。这种结构的形状、尺寸和间距对于每个摩擦学系统都是特定的，这阻碍了对最佳参数的任何概括性陈述。在第一个资助期内，通过激光干涉、微压花及其组合（多尺度结构化）在平面上生产结构，并使用实验室摩擦计进行表征。研究表明，在流体动力润滑或混合润滑条件下，激光加工的十字形表面可以延长润滑膜的使用寿命，减少磨损，半球形浮雕结构在边界润滑或混合润滑条件下也可以起到同样的作用。除了摩擦接触外，表面结构还可以用于接触区以外，将润滑剂带到接触区或防止润滑剂离开接触区。对于高压应用，精细结构因此将得到保护，并且可以避免润滑不足。初步研究表明，这种纹理（特别是多尺度）具体影响润湿和铺展行为，并允许控制被动润滑剂transport.Considering的初步调查，研究建议的目标可以定义为：1。将所获得的知识和平面表面中有关多尺度结构使用的已证实的增强功能转移到具有弯曲圆柱表面的应用（即滑动轴承）。2.研究表面结构（激光、浮雕和多尺度）对润滑剂被动输送的影响，作为表面形貌的结果，作为温度梯度的函数，以及研究结果的应用（即滚动轴承）。在这个意义上，将设计和测试结构圆柱表面的测试装置。模拟将进行解释和分析的形成过程。将对制备样品的表面（即滑动轴承的轴套）进行形貌（形状和粗糙度）和微观结构（SEM、EBSD、TEM）表征。样品的摩擦学检查将在亚琛大学（RWTH）IME的服务合同下进行。对于被动润滑剂输送的研究，将在平坦纹理表面上进行模拟和基本实验，以验证模型并确定结构的短名单。然后将有前途的结构应用于机器元件和摩擦学检查。