PVD-coating of electroplated cBN grinding tools to optimize the wear and application behavior when grinding nickel-based alloys

电镀立方氮化硼磨具的 PVD ​​涂层可优化磨削镍基合金时的磨损和应用行为

• 批准号: 400814654
• 负责人: Professor Dr.-Ing. Jan C. Aurich
• 金额: --
• 依托单位: Lehrstuhl für Fertigungstechnik und Betriebsorganisation (FBK)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/400814654?language=en
• 关键词: PVD; coating; electroplated; cBN; grinding

This project aims to decrease the grinding wheel wear and to increase the material removal rate when grinding nickel-based alloys by applying coatings. Due to their excellent high-temperature strength, high fatigue strength, and exceptional corrosion resistance, nickel-based alloys are used in high-tech areas such as in turbines and engines. The required surfaces with low roughness can often only be manufactured by grinding. Grinding nickel-based alloys is difficult because of their thermal, mechanical and chemical properties. The reduction of the grinding wheel wear as well as the generation of a high quality surface and near surface integrity are the challenges. The friction between grinding wheel and workpiece during the process leads to mechanical wear and the heat from friction accelerates the chemical and thermal wear. The application of coatings on grinding wheels is a promising method to meet the mentioned challenges. By using coatings, the friction will be reduced and the grain retention force will be increased, whereby a bigger chip space is possible via reduction of the galvanic bond thickness. There is still a lack in understanding the interdependencies between the coating process parameters and the process results. At the end of the project, a reduction of tool wear and friction as well as an increase of the chip space and the involved optimization of the martial removal rate when grinding nickel based alloys with PVD-coatings will be achieved. A PVD-coating will be developed that increases the grain holding forces and improves the tribological and non-adhesive properties of the grinding wheel. The chip space will be maximized by a reduced bond level of the cBN grains because of the improved galvanic bond properties of the applied PVD-coating. The grain retention forces applying different PVD-coatings and bond levels will be examined. The advantage of the PVD-coating will be validated in an experimental comparison of coated cBN-grinding wheels with adjusted chip space against non-coated cBN-grinding wheels with standard chip space at high efficiency deep feed grinding of nickel based alloys. The project result will be a coated grinding wheel with adjusted chip space and larger space for cooling lubricant and chips in process. As a consequence, the material removal rate and the total material removal when high efficiency deep feed grinding nickel-based alloys will be increased without thermal damage of the near surface layer. The grinding wheels’ performance and the efficiency of the process will be increased.

该项目旨在通过涂涂料来磨削镍基合金时降低磨削轮的磨损并提高材料去除速率。由于其出色的高温强度，高疲劳强度和出色的耐腐蚀性，因此在涡轮机和发动机等高科技区中使用了基于镍的合金。通常只能通过研磨来制造所需的低粗糙度表面。由于其热，机械和化学性能，磨镍的合金很困难。挑战是磨削轮磨损的减少以及高质量表面完整性的产生。在此过程中，磨轮和工作场所之间的摩擦导致机械磨损和摩擦的热量加速了化学和热磨损。涂料在磨轮上的应用是应对上述挑战的承诺方法。通过使用涂层，将减少摩擦，并增加晶粒的保留力，从而通过减小电键键厚度可以增加更大的芯片空间。在理解涂料过程参数与过程结果之间的相互依赖性仍然缺乏。在项目结束时，将降低工具磨损和摩擦，并增加芯片空间，并在用PVD涂层的基于PVD涂层的基于镍的合金时进行武术清除率的优化。将开发出PVD涂层，从而增加晶粒持有力并改善磨轮的摩擦学和非粘合性特性。由于施加的PVD涂层的电流键特性提高了CBN晶粒的键水平，将最大程度地提高芯片空间。将检查采用不同PVD涂层和键水平的谷物保留力。 PVD涂层的优势将在具有调整后的芯片空间的涂层CBN磨牙的实验比较中与非涂层的CBN磨床轮子进行的实验比较，并具有具有高效率的镍基合金的标准芯片空间。该项目的结果将是一个带有调整的芯片空间的涂层磨轮，并且在过程中进行冷却润滑剂和芯片更大的空间。结果，当高效率深饲料磨碎的基于镍的合金的材料去除速率和总物料去除，而无需近表面层的热损伤。研磨轮的性能和过程效率将提高。