High-Precision 4 Flute Round Nose End Mills

Processed Materials	Pre-Hardened Steel 40~50HRC		Hardened Steel 50~60HRC		Hardened Steel 60~68HRC
Cutting Speed	300m/min		150m/min		100m/min
Diameter (mm)	Rotational Speed (min-1)	Feed Speed (mm/min)	Rotational Speed (min-1)	Feed Speed (mm/min)	Rotational Speed (min-1)	Feed Speed (mm/min)
3	32000	1225	16000	610	11000	420
4	24000	1500	12000	745	8000	500
5	19000	1630	9500	815	6400	550
6	16000	1850	8000	925	5300	610
8	12000	1850	6000	925	4000	610
10	9600	1850	4800	925	3200	610
12	8000	1920	4000	960	2700	648
16	6000	1440	3000	720	2000	480
Maximum Cutting Depth

1. Please use high-precision and high rigidity equipment and fixtures.
2. When the rigidity of the machine tool and workpiece installation is poor, vibration and abnormal sound may occur. In this case, the speed and feed rate in the table above should be reduced year-on-year.
3. Please use air cooling or MQL (minimum amount of oil mist cooling).
4. It is recommended to use sequential milling for side milling.
5. Minimize the tool suspension length as much as possible without interference.

NNCH-4R high-precision 4 flute round nose end mills provides a wide range of specifications, covering a variety of tool diameters, blade lengths and fillet radius configurations, which can be flexibly adapted to different processing requirements. Whether it is fine processing or efficient material removal, you can freely combine and select the best solution according to the specific application scenario.

This series of milling cutters adopts a 45° helix angle design, combined with a round nose blade shape, which effectively reduces cutting vibration and improves surface finish. The round nose blade is particularly suitable for semi-finishing and finishing, which can not only provide excellent tool strength, but also ensure good cutting performance, especially for complex curved surfaces and high-precision mold processing.

The milling cutter uses ultra-ultrafine carbide material with advanced MT coating technology, which has extremely high wear resistance and heat resistance. The hardness of the tool material can reach HRC≤65, ensuring stability and durability in the processing of high-hardness materials. At the same time, the precision grinding process ensures the sharpness of the cutting edge, making the processing process smoother and reducing cutting resistance and heat accumulation.

NNCH-4R high-precision 4 flute round nose end mills is suitable for a wide range of material processing, including low carbon steel, alloy steel, pre-hardened steel, heat-treated steel (up to HRC65), etc. It performs particularly well in high-precision processing of high-hardness materials, and can effectively improve processing quality and extend tool life.