Effect of tool geometry on the wear of cemented carbide coated with TiAlN during drilling of compacted graphite iron

Tool wear monitoring in drilling of high-strength compacted graphite cast irons

“…These results further reinforce the hypothesis of higher cutting temperatures in CGI’s B and C, since the higher temperatures at the chip–tool interface increase the toughness of the material and subsequently increasing the shearing process and favoring its transition from triangular and rectangular to spiral shape. This evolution for the spiral shapes in CGI’s B and C, especially after the tool is relatively worn (VB Bmax > 0.20), corroborates with the findings attributed to De Oliveira et al 26 in their studies about the effect of tool geometry on the machinability of CGI in the drilling process. They found that under more severe cutting conditions, a change of the geometry of the main cutting edge caused the wear of the tools and the formation of spiral chips.…”

Comparison of scratch resistance of lamellar and compacted graphite irons used in cylinder liners

“…Before to discuss, it is remarkable the lower energy to produce a scratch on the grey cast iron. From the machining point of view, it means a suitable reproduction of the poorer machinability of compacted graphite iron [12], without the use of an industrial environment to verify that.…”

“…However, these mentioned investigations [6][7][8][9] only focused on lamellar graphite, while compacted graphite has been increasingly used to produce cylinder liners, due to its thermal properties [10], which can result in a better wear resistance in some systems, such as brake disc rotors [11]. On the other hand, due to some microstructural features and hardness, the compacted graphite iron has poor machinability, such that different efforts to solve this issue have been done [12]. From the manufacturing point of view, the scratch test can be useful to understand the contact between a tool machine and a workpiece [13], helping to improve the surface quality and avoiding some undesirable effects associated with the honing process, such as the so-called folded metal [14].…”

Investigation of Drilling Machinability of Compacted Graphite Iron under Dry and Minimum Quantity Lubrication (MQL)

“…The main wear mechanism of the tool in the CGI machining process is within the adhesive because the casting surface of CGI consists of the ferrite, which is easy to bond with the cutting edge of the tool. In addition, abrasive wear has been observed in the prior study [10][11][12][13][14]. The flank surface of the cutting tool is the main region where tool wear can be found after the machining.…”

“…The flank surface of the cutting tool is the main region where tool wear can be found after the machining. De Oliveira et al [10] conducted the CGI drilling experiments, which used three tool-based geometries of the cemented carbide drill with TiAlN-coating, and discovered that the main wear mechanism of the drill is abrasive wear in these experiments. Gabaldo et al [11] researched the tool wear mechanism and tool life in CGI milling using a cemented carbide and ceramic tool.…”