Development of tribological optimized guide pads for deep hole drilling processes

在实际移交项目中，所取得的成果和深孔钻头导向瓦的摩擦学优化知识将应用于其他深孔钻削工艺。在基础工程中，实现了BTA深孔钻工艺导瓦研制的新工艺链。这一工艺链包括应用减摩TA-C涂层以及未涂层和涂层基材的前处理和后处理。微细抛光已经取代了传统的抛光工艺。后者在完成未涂覆的衬底时对轴向引入区的形状进行了确定的优化。作为后处理的整理负责有效地去除液滴。改进后的导瓦耐磨性能明显好于传统导瓦。针对调整导板几何形状的抛光工艺的形状优化进行了充分的研究，得到了优化的解决方案。结合TA-C涂层，发明了一种导向垫设计，改善了导向垫与孔壁之间的摩擦学接触条件。在拟议的项目中，这些发现将扩展到其他钻井过程。在此，将结合其他涂层的应用效率来研究微精加工的形状优化。此外，还将分析在炮钻导向垫上使用ta-C涂层的情况。根据基础项目和新开发的解决方案的结果，将进行改进钻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.