Iwaki, Japan – September, 2025 – Tungaloy Corporation (President: Satoshi Kinoshita, Head Office: Iwaki City, Fukushima Prefecture) announces the expansion of its RoundSplit series, now featuring inserts with a serrated cutting edge and wear-resistant PVD grade AH3135 for improved stability and surface finish in steel and stainless steel machining.
Challenges and Trends
In general machining, operations involving long overhangs are particularly prone to chatter, making it difficult to maintain stable machining quality. In addition, in workplaces where both steel and stainless steel are machined, different insert grades suitable for each material must be used, increasing the complexity of tool management and setup changes. As a result, there is a growing demand for versatile tools that offer high resistance to chatter.
Product Overview
RoundSplit is a round insert type face milling cutter that ensures stable machining by suppressing vibration. Its unique serrated cutting edge design reduces cutting resistance, enabling high productivity even in long overhang or high-feed machining applications.
Benefits and Features
Excellent Anti-Vibration Performance with Serrated Cutting Edges on Inserts
– Serrated (wave-shaped) cutting edges effectively disperse vibrations during machining
– Suppresses chatter even under long overhang conditions, ensuring stable cutting
– Prevents surface roughness and tool life reduction caused by vibration, enabling high-quality finishes
High Chipping Resistance with PVD Grade “AH3135”
– PVD-coated grade offering an excellent balance of wear resistance and toughness
– Minimizes edge chipping and breakage during interrupted cutting or under unstable machining conditions
– Extended tool life reduces tool change frequency, improving productivity and cost efficiency
Cutting Performance
Tool Life Comparison
| Cutter | TRC12R050M22.0-05 (ø50 mm, CICT = 5) |
| Insert | RCMT1204EN-NMJ AH3135 |
| Cutting speed | Vc = 200 m/min |
| Feed per tooth | fz = 0.3 mm/t |
| Depth of cut | ap = 1.5 mm |
| Width of cut | ae = 30 mm |
| Coolant | Dry |
| Machine | Vertical M/C, BT50 |
3 times tool life increase during steel machining!
| Cutter | TRC12R050M22.0-05 (ø50 mm, CICT = 5) |
| Insert | RCMT1204EN-NMJ AH3135 |
| Cutting speed | Vc = 150 m/min |
| Feed per tooth | fz = 0.2 mm/t |
| Depth of cut | ap = 1.5 mm |
| Width of cut | ae = 30 mm |
| Coolant | Dry |
| Machine | Vertical M/C, BT50 |
Reduced edge fracture during stainless steel machining, while
increasing tool life by 1.5 times!
