Fundamental investigations on micro single-lip deep hole drilling of challenging drilling situations

具有挑战性的钻孔情况下的微型单唇深孔钻削的基础研究

• 批准号: 314033035
• 负责人: Professor Dr.-Ing. Dirk Biermann
• 金额: --
• 依托单位: Institut für Spanende Fertigung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/314033035?language=en
• 关键词: Fundamental; investigations; micro; single; lip

In order to stabilize the tool at the beginning of the drilling process, deep hole drilling tools require a drill guide in the form of pilot holes or drill bushes. The conventional process chain for deep hole drilling in complex drilling situations, consisting of face milling, mechanical pilot hole drilling and subsequent deep hole drilling, can be significantly shortened by substituting face milling and mechanical pilot hole drilling with the laser pilot hole drilling process. In addition to increasing productivity, laser processing also enables the wear-free drilling of pilot holes in case hardened components. The research project applied for follows on from the DFG last project, within the framework of which extensive investigations were carried out on the generation of laser pilot holes using single laser pulses and on the process combination of laser pilot hole drilling and single-lip deep hole drilling in demanding drilling situations. Based on the results, the aim of this project is to extend the flexibility of the laser drilling process, which has so far been limited by the single pulse with regard to the feasible bore hole diameters, by the use of laser helical drilling. By distributing the material ablation over a large number of laser pulses, the roundness deviation of the laser bore is also to be reduced. The identification of suitable laser parameters for the processing of the materials X2CrNiMo17-12-2 and 20MnCr5 is followed by investigations on tool life and bore hole quality when using the process combination. Due to the solidification of the melt at the bore hole wall, laser drillings show a lower bore hole quality compared to mechanically produced bore holes. Therefore, a further aim of this project is to use a step drill to machine the entire bore hole surface through the second step of the step drill thus significantly increasing the bore hole quality. For the machining of case hardened components with the step drill, a local heat treatment is required to reduce the hardness of the material in the contact area of the cutting edges. A thermal simulation will be used to identify suitable laser parameters for the realization of the required temperature window. Due to the increasing use of innovative additive methods like selective laser melting, the proportion of components with complex surface contours and thus demanding drilling situations is increasing. A further goal of this research project is the fundamental investigation of deep hole drilling in demanding drilling situations using additive manufactured pilot holes. The focus of the investigations is on the influence of the high roughness of the additive holes on tool wear and the guidance of the tool.

为了在钻井过程开始时稳定该工具，深孔钻孔工具需要以导向孔或钻孔形式的钻孔指南。在复杂钻孔情况下进行深孔钻孔的常规工艺链，包括面部铣削，机械飞行员孔钻孔和随后的深孔钻孔，可以通过用激光飞行员孔钻孔钻孔工艺代替面部铣削和机械飞行员孔钻孔来大大缩短。除了提高生产率外，激光处理还可以在固化成分的情况下进行无磨损的钻孔。该研究项目申请了DFG最后一个项目的以下内容，在该框架内，使用单个激光脉冲以及激光飞行员孔钻孔和单唇深孔钻孔进行了对激光飞行员孔的生成进行广泛的研究。基于结果，该项目的目的是扩展激光钻孔过程的柔韧性，到目前为止，通过使用激光螺旋钻钻，它受到可行的孔孔直径的限制。通过在大量激光脉冲上分配材料消融，还应减少激光孔的圆度偏差。使用工艺组合时，鉴定合适的激光参数用于处理材料X2CRNIMO17-12-2和20MNCR5的材料X2CRNIMO17-12-2和20MNCR5。由于在钻孔壁上的熔体固化，与机械产生的孔孔相比，激光钻孔的孔质量较低。因此，该项目的进一步目的是使用台阶钻头通过步骤钻的第二步加工整个孔孔表面，从而显着提高了孔孔的质量。对于使用台阶钻头加工的情况硬化组件，需要进行局部热处理以减少切割边缘接触区域中材料的硬度。热模拟将用于识别合适的激光参数以实现所需温度窗口。由于越来越多地使用了创新的加性方法，例如选择性激光熔化，因此具有复杂表面轮廓的组件的比例，因此苛刻的钻孔情况正在增加。该研究项目的另一个目标是对使用加法制造的飞行员孔进行苛刻钻孔情况进行深孔钻孔的基本研究。调查的重点是添加孔的高粗糙度对工具磨损和工具的指导的影响。