Development of tribological optimized guide pads for deep hole drilling processes

在实际的转移项目中，所取得的成果和深孔钻头导向垫的摩擦学优化知识将应用于其他深孔钻井工艺。在基础项目中，实现了BTA深孔钻孔导向垫开发的新工艺链。该工艺链包括减少摩擦的ta- c涂层的应用以及未涂层和涂层基材的预处理和后处理。传统的抛光工艺已被微精加工所取代。后者在完成未涂层基板时影响轴向引线区域的确定形状优化。作为后处理的精加工负责有效去除液滴。改进后的导向垫的磨损性能明显优于传统导向垫的磨损性能。优化形状相对于精加工过程的调整导向垫的几何形状进行了充分的研究，得出了一个优化的解决方案。结合ta-C涂层，发明了一种导向垫设计，改善了导向垫与井壁之间的摩擦接触条件。在拟议的项目中，研究结果将扩展到其他钻探过程。在这里，将研究微精加工的形状优化，并考虑其他涂层的应用效率。此外，还将分析ta-C涂层在枪钻导向垫上的应用。基于基础项目的成果和新开发的解决方案，将进行改进的钻井工具在工业钻井过程中的最终应用。

Within the actual transfer project the achieved results and the knowledge of the tribological optimization of guide pads for deep hole drills will be applied to alternative deep hole drilling processes. In the fundamental project a new process chain for the development of guide pads for the BTA deep hole drilling process has been realized. This process chain includes the application of a friction reducing ta-C-Coating as well as pre- and after-treatment of the uncoated and coated substrate. The conventional polishing process has been substituted by microfinishing. The latter effects a defined shape optimization of the axial lead-in-area when finishing the uncoated substrate. The finishing as an post-treatment is responsible for an effective removal of the droplets. The wear behavior of the modified guide pads is significantly better than the wear behavior of conventional pads. The optimization of the shape with respect to the finish process to adjust the guide pad geometry has been adequately studied, resulting in an optimized solution. In combination with the ta-C coating, a guide pad design has been invented which improves the tribological contact conditions between the guide pad and the bore wall. In the proposed project the findings will be extended to other drilling processes. Here, the shape optimization by microfinishing will be investigated with regard to the efficiency of the application of other coatings. Additionally, the use of a ta-C coating for the guide pads of gun drills will be analyzed. Based on the results of the fundamental project and the newly developed solutions, a final application of the modified drilling tools in industrial drilling processes will be carried out.