Ende des Projekts PVD-Beschichtung galvanisch gebundener cBN-Schleifwerkzeuge zur Optimierung des Verschleiß- und Einsatzverhaltens für die Zerspanung von Nickel-Basis-Legierungen
Grinding generates high levels of friction and heat during the process. A reduction in the friction processes and chemical interactions between the contact partners during grinding can be achieved by using a physical vapor deposition (PVD) coating on the grinding wheel. Based on this approach, the recently completed project "PVD coating of electroplated cBN grinding tools to optimize the wear and application behavior for the machining of nickel-based alloys" optimized the wear and application behavior during grinding using PVD-coated electroplated cBN grinding tools.
For the investigations, the AlTiN and TiB2 coating systems were appliedto electroplated grinding wheels with an average grain embedment depth of 50 % and used to grind Inconel® 718 at the FBK.
The performance tests during grinding showed that the reduction of the grain embedment depths from 70 % to 50 % already resulted in a reduction in the process forces, which can be attributed to the larger chip space and the improved cooling lubricant supply. By using the TiB2coating, the process forces could be further reduced by up to 18 %. As a result, the workpieces are subjected to less mechanical stress and less spindle power is required for machining. It can also be assumed that longer tool life can be achieved.
