Economical drilling and milling of CFRP without influencing the surface integrity
Themes: Process-Tech Forum
Partner: VDMA-Arbeitsgemeinschaft Hybride Leichtbau Technologien
This präsentation describes the peculiarities of machining composites compared to metalworking. Simplified theoretical models will show how CFRP should be machined without delamination, burn marks and breakage of cutting tools. Based on this analytical approach, the presentation will show how a drilling tool should be designed to cause less delamination at the entrance, interior, and exit. While delamination at the entrance and exit is well understood, the content of the presentation focuses more on delamination inside of the hole and there surface. The occurrence and avoidance of the so-called "Volcano effect" and the reason why holes in composites become smaller after a few days are explained.
Depending on the chip removal rate while trimming the part, different strategies can be chosen. Furthermore, this comparison between different machining strategies should create a better understanding of the process for this application.