In a further development, HR2 is available in a newly developed turning grade – T9226 – which is pitched at heavy roughing and peeling operations, thanks to its high concentration of cobalt binding, fine grain structure and coating surface treatment. In a recent trial performing interrupted cuts on P4 steel without coolant, the T9226 grade lasted 52 minutes, comparing favourably with a competitor grade (25 minutes). The cutting data included 55 m/min speed, 0.8 mm/rev feed and 8 mm axial depth of cut.
Dormer Pramet’s HR2 and T9226 boost rough turning
Dormer Pramet has introduced a chipbreaker and insert grade for heavy roughing applications. Targeted at the rough turning of forgings and castings, such as cylinders, shafts and large pins, the HR2 features a positive geometry that is designed to improve tool life and performance. According to the company, the cutting edge and wide peripheral land promote increased productivity, while offering chip evacuation at feeds of circa 0.7 mm/rev.
