Оптимальный выбор Kennametal 2025 - 2026 - страница 233

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HIGH PERFORMANCE HARVI I TE APPLICATION RECOMMENDATION for Surface Profiling with HARVI I TE Not all four cutting edges reach the center of the HARVI I TE ball nose end mill. Due to this, certain tilt angles will engage different numbers of cutting edges and can alter the required cutting parameters. This will also be altered by the depths of cut, which will change the contact area and resulting number of edges engaged. When surface profiling with any ball nose end mill, optimum performance At the tip of the tool, only the center cutting edges exist. will be achieved by tilting away from the center of the tool if possible. This The rotational velocity is zero in the center. is due to the fact that at the tip of the tool only the center cutting edges exist (two in the case of HARVI I TE), and also that the rotational velocity is zero in the center. Kennametal recommends tilting the end mill to engage more cutting edges and avoid the zero-speed condition. [ As the HARVI I TE ball nose end mills do have two center cutting edges, it is possible to machine without tilting if the application requires this. Just factor the reduced number of cutting edges into the cutting parameter calculations. SOLID END MILLING HARVI I TE Ball Nose 0º 24º 52º – 55º In the case of the HARVI I TE ball nose end mill, it is For tilt angles less than 24˚ and shallow For maximum profiling performance, possible to take much larger depths of cut than other profiling depths, only two cutting edges will a tilt angle of 52˚-55˚ will result in full standard ball nose end mills. be typically engaged. engagement of all edges with a wide Therefore, a large depth of cut can result in partial range of cutting depths. As the end mill is tilted above this, then all engagement of all four edges at small or zero-tilt angles. four edges will at least be partially engaged. kennametal.com C16