Analysis of interactions and effects of new preparation methods and resulting drill hole qualities in single lip deep hole drilling

单唇深孔钻孔的特别特点是能够产生高孔径质量，因此不需要后续的加工程序来提高质量。由此产生的钻孔质量关键取决于切削零件及其导向元件在钻孔内的状态。当使用单唇深孔钻头时，由于导向垫的表面质量不足以及工具的逐渐磨损，会在孔表面的外部区域发生故障和谷。后续项目将有助于了解单齿深孔钻削过程中切削零件与钻孔表面之间的摩擦学相互作用。该项目的目标包括分析特定涂层前和涂层后处理与制备的钻井工具性能的相互依赖性。因此，有针对性的制备应用被用于优化单唇深孔钻头导向垫的表面。该研究项目的结果有利于刀具制备工艺的发展，从而提高表面质量。除了增强涂层附着力外，还应在准备好的工具上实现表面平滑。除了磨料水射流喷砂外，还将转移另外两种不同的高精度表面处理的另一个应用范围。这些将是抛光研磨和皮带整理。这些不同的运动程序保证了高表面质量，并导致表面结构的改变。分析了涂装前处理和涂装后处理对表面织构的影响，以及由此产生的单唇深孔钻头的形状和表面变化。在低硫含量的回火钢42CrMo4+QT （AISI 4140）上进行钻孔试验，有助于了解使用制备的单唇深孔钻头时的相互作用，并用于评估工具性能。

Single lip deep hole drilling is particularly characterized by the ability to produce a high bore hole quality, consequently by doing without subsequent machining procedures for quality improvement. Resulting bore hole quality is crucially based on the condition of the cutting part and its guidance elements within the bore hole. When applying single lip deep hole drills with insufficient surface qualities of the guiding pads as well as a progressive tool wear, failures and valleys in the external zone of the bore surface occur.The follow-up project will help to understand the tribological interactions between the cutting part and the bore hole surface during single lip deep hole drilling. The project objectives include the analysis of interdependencies of specific pre- and post-coating treatments with the performance of prepared drilling tools. Therefore targeted preparation applications are used for optimizing the surfaces of the guiding pads of single lip deep hole drills. The results of the research project benefits the development of tool preparation processes which leads to improved surface qualities. Beside an enhanced coating adhesion, a surface smoothing on prepared tools shall be achieved. In addition to the abrasive water jet blasting two further different high-precision surface treatments of another scope of application are going to be transferred. These will be polish-grinding and belt-finishing. Each of these kinematical different procedures guarantees high surface qualities and leads to an altered surface structure. The impact of respective pre- and post-coating treatments on surface texturization will be analyzed as well as the resulting shape and surface changings of the single lip deep hole drills. Drilling tests in tempered steel 42CrMo4+QT (AISI 4140) with lower sulphur content help to understand the interactions when applying prepared single lip deep hole drills and function for evaluation of the tool performance.