Dormer Pramet introduces chipbreakers for existing stainless steel, steel and cast iron turning grades, plus new grade for stainless steel turning

​Dormer Pramet has unveiled chipbreakers for existing turning inserts, for stainless steel, steel and cast iron, as well as a new insert grade for stainless steel.

NF1 and NF2 positive chipbreakers support turning applications in stainless steel. The balanced shape of these new inserts offers “excellent chip control”, with low cutting forces promoting both high durability and productivity

NF1 is a universal offering for finishing to medium machining, peripherally ground to provide a very good surface finish. NF2 incorporates a small stabilising T-Land and covers a wide range of applications from semi-finishing to light roughing

FF2, FM2 and RM3 chipbreakers are for steel and cast iron, providing good chip control at low feed and depth of cut and producing high quality machined surfaces

FF2 has a positive rake angle and depth of cut from 0.15 mm for fine finishing applications in low carbon steels. The FM2 chipbreaker is for finishing to medium machining with depths of cut from 0.2mm. Featuring a protective land, it is suitable for continuous and interrupted operations. RM3 is for roughing applications in steels and suited to unfavourable machining conditions.

Finally, SF2 and SF3 positive inserts provide a highly secure and dependable option for turning applications in high-temperature alloys. SF2 is for fine turning at the lowest possible feeds, while SF3 with its positive inclined cutting edge supports finishing operations.

In addition to the chipbreakers, a new insert grade for turning stainless steels has also been launched, T7325. This is described as the first choice for productive machining of stainless steels. It has been developed to complement the existing T7335 grade, which is recommended for use in unstable machining environment

Also suitable for interrupted cutting, T7325 features a functional gradient substrate and special MT-CVD coating. This combination offers high cutting strength, reduced built-up edge and resistance to the formation of cracks. As a result, the grade provides a high level of operational reliability, performance and tool life.