Оптимальный выбор Kennametal 2025 - 2026 - страница 250

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HIGH PERFORMANCE HARVI SERIES APPLICATION RECOMMENDATION for Surface Profiling with HARVI III Ball Nose & Taper Ball Nose Not all six cutting edges reach the center of the HARVI III 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 III), 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 III 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 III Ball Nose & Taper Ball Nose 15º 22º 40º – 45º For tilt angles less than 15˚ and shallow After reaching a tilt angle of at least For maximum profiling performance, profiling depths, only two cutting edges will 22˚, then all six edges will at least be a tilt angle of 40˚–45˚ will result in full be typically engaged. As the end mill is tilted partially engaged. engagement of all edges with a wide above this, the next two edges will engage. range of cutting depths. C33 kennametal.com