Каталог Dormer Pramet фрезерование 2021 - 2022 - страница 116

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9 SOLID HM MILLS – CORRECTION FACTORS 3c How to use this table to find the correction factor for the feed per tooth (fz or IPT) ) for plain copy milling: 1. Find the closest radial immersion (APMX EFW / DC) for your cutting application in the top row of the table. 3. Find your closert axial immersion (APMX FFW / DC) for your cutting application in the left column of the table. 4. The intersection (cell) of the radial and axial immersions is the correction factor for the feed per tooth. DC Example for plain copy milling: 1. Applying an 8 mm ball nose cutter with a depth of cut of 0.8 mm (APMX FFW), the aim is to APMX FFW achieve a theoretical surface roughness of 32 μm. 2. The correction factor for cutting speed with an axial immersion of 10% = 1.67 can be found in table 3a. APMX EFW 3. The step-over distance for a Rth of 32 μm = 1.01 mm can be found in table 3b. 4. The correction factor for feed per tooth with an axial immersion of 10% and a radial immersion of 1.01 / 8 = 12.6% can be found in table 3c and is in this case 2.33. APMX APMXFFWEFW5% 10 % 15 % 20 % 25 % 30 % 35 % 40 % 50 % 5% 5.26 3.82 3.21 2.87 2.65 2.50 2.40 2.34 2.29 10% 3.82 2.78 2.33 2.08 1.92 1.82 1.75 1.70 1.67 15% 3.21 2.33 1.96 1.75 1.62 1.53 1.47 1.43 1.40 20% 2.87 2.08 1.75 1.56 1.44 1.36 1.31 1.28 1.25 25% x.f 2.65 1.92 1.62 1.44 1.33 1.26 1.21 1.18 1.15 30% 2.50 1.82 1.53 1.36 1.26 1.19 1.14 1.11 1.09 35% 2.40 1.75 1.47 1.31 1.21 1.14 1.10 1.07 1.05 40% 2.34 1.70 1.43 1.28 1.18 1.11 1.07 1.04 1.02 45% 2.31 1.68 1.41 1.26 1.16 1.10 1.05 1.03 1.01 50% 2.29 1.67 1.40 1.25 1.15 1.09 1.05 1.02 1.00 To increase the surface quality, the tool or surface should be inclinded with a tilt angle off 10°– 15°. 115