Machining processes

Description

The studies in this sector, conducted through experimental activities, were carried out with the primary objective of improving the environmental sustainability of the entire system used to carry out machining by chip removal, without neglecting the need to improve the quality of the surfaces worked and the economy of the process.
To this purpose, the focus was on:

• the development of machine tools with reduced environmental impact, characterized by high rigidity and dynamic and thermal stability, for the realization of precise pieces and with very high surface finishes;
• the type of lubrication-refrigeration, due to its influence on the environmental impact, on the wear of the tool, on the surface finish of the machined surface and on the costs:
  • conventional lubrication-refrigeration technique
  • minimal lubrication-refrigeration technique
  • dry lubrication-refrigeration technique
• the development of materials for tools and surface coatings capable of withstanding the most severe working conditions:
  • carbides, also with wiper technology;
  • coated and uncoated ceramics;
  • cryogenically treated carbides.

Tool wear and hole quality in drilling of CFRP/AA7075 stacks with DLC and nanocomposite TiAlN coated tools

Flank wear vs. cutting time using a PCBN insert, under wet turning condition (polymer concrete bed)

(a) Flank wear vs. cutting time and (b) surface roughness vs. cutting time, under wet, dry and MQL turning conditions, using ceramic inserts (polymer concrete bed).

Laboratories

• CNC work center lab

Publications

1. A. D’Orazio, M. El Mehtedi, A. Forcellese, A. Nardinocchi, M. Simoncini, Tool wear and hole quality in drilling of CFRP/AA7075 stacks with DLC and nanocomposite TiAlN coated tools. Journal of Manufacturing Processes 30, 2017, 582-592
2. M. Cabibbo, A. Forcellese, R. Raffaeli, M. Simoncini, Reverse Engineering and Scanning Electron Microscopy Applied to the Characterization of Tool Wear in Dry Milling Processes. Procedia CIRP, 62, 2017, 233-238
3. C. Bruni, A. Forcellese, F. Gabrielli, M. Simoncini, Hard turning of an alloy steel on a machine tool with a polymer concrete bed. Journal of Materials Processing Technology, 202, Issues 1–3, 2008, 493-499
4. C. Bruni, A. Forcellese, F. Gabrielli, M. Simoncini, Effect of the lubrication-cooling technique, insert technology and machine bed material on the workpart surface finish and tool wear in finish turning of AISI 420B. International Journal of Machine Tools and Manufacture, 46, Issues 12–13, 2006, 1547-1554

Responsabile scientifico

• Prof. Archimede Forcellese, a.forcellese@univpm.it