Mapal's new coating material doubles tool life

The performance capability of single-bladed reamers depends principally on the quality of the cutting edge, which is determined by its geometry and by the quality of the coating. For successful reaming, a tool with a very sharp cutting edge and a hard coating is required. In addition, for optimum performance, the coating must be thin and exhibit good layer adhesion.

MAPAL’s new HC418 coating meets all of these requirements and, thanks to special process control during manufacturing, is also significantly ductile whilst remaining as wear-resistant as standard CVD coatings. The balance between the robustness of the coating and ductility also ensures that reamers with the new coating are ideally suited even for difficult machining scenarios such as interrupted cutting.

The smooth surface finish of the coating minimises friction on the workpiece, which enables the chips to flow off more easily. The high wear resistance ensures consistency in machining, excellent process reliability and dependable quality as standard.

Practical tests have shown that, compared with ordinary reamers, the tool life for reamers coated with HC418 is more than double when working with high-alloy steels as well with tough cast materials such as spheroidal graphite cast iron (GGG) and vermicular graphite cast iron (GGV). In addition, the tool life is approximately 20 per cent longer with grey cast iron (GG).

MAPAL’s entire range of coated indexable inserts for guided reamers is now available with the new HC418 coating.