Общий каталог Sumitomo 2019 - 2020 - страница 1049

Tool Feed Direction SUMIBORON SUMIBORON for Powdered Metal Machining BN7500 Sintered Alloy Achieves high-precision, high-efficiency machining of powdered metal ■ General Features High-density sintered micro-grained CBN grains provide good sharpness and wear resistance to produce an excellent machined face surface on powdered metals during finishing. Excellent sharpness and wear resistance for high-quality machined surfaces in powdered metal finishing. Surface finish using the BN7500 Surface finish using previous CBN L ★ The previous CBN left white blemishes on the machined surface, whereas the BN7500 leaves a better, glossy surface finish ■ Features ● Excellent for finishing of powdered metal Excellent machined surface quality and surface roughness. ● Available with 5 different types of edge treatment for machining sintered parts of any shape or hardness The LF type has a sharper edge designed specifically for machining powdered metal with minimal burr and improved machining precision. The HS type has a strengthened cutting edge for stable chipping resistance during interrupted cutting and finishing. Provides machining stability by reducing the variation in early milling surface roughness with the type emphasizing LE surface roughness. The LS Type has an excellent balance of fracture resistance and sharpness, and supports finishing that includes light interrupted cutting. ■ Cutting Performance 10 0.6 ● Finished Surface Roughness during Initial Machining Previous CBN standard Conventional CBN Sharp Edge 0.8 8 0.5 BN7500 Standard LS Type LF Type LE Type 6 0.4 Standard 0.6 0.3 4 BN7500 LF Type Excellent surface roughness and stability 0.2 BN7500 0.4LF Type R Honing 2 0.1 50% reduction in burr height Control Variations in Early Surface Roughness 0.2 No R Honing Negative Land No Negative Land 0 50 100 150 200 0 50 100 150 200 α = 15° α = 0° No. of Passes No. of Passes 0 Work Material : Sintered Ferrous Alloy SMF4040 Equivalent (70HRB, Continuous Cutting) Work Material : Sintered Ferrous Alloy SMF4040 Equivalent (70HRB, Continuous Cutting)Tool Cat. No. :2NU-CNGA120408Tool Cat. No. :2NU-CNGA120408★ Able to control early surface roughness variations Cutting Conditions : vc = 200m/min, f = 0.1mm/rev, ap = 0.1mm Wet Cutting Conditions : vc = 200m/min, f = 0.1mm/rev, ap = 0.1mm Wet by applying R honing to the cutting edge. ● Feed and Burr Relationship ■ Recommended Cutting Edge Treatment A No R Honing LF Type (Burr Control Emphasised) B LE Type LS Type Workpiece Rotation Direction When Withdrawn ★ The LF type without R honing has a cutting edge sharpness superior to the LE type with R honing and can control burrs better. R Honing(Surface Roughness Emphasised) Standard ★ For a feed rate of 0.1 mm/rev or higher, the LS type has a cutting edge sharpness superior to the standard type and can control burrs better. LF Type LE Type LS Type Standard R Honing HS Type (Breakage Control Emphasised) Diagram Frequency of Interruption Heavy A Burr E W Honing Diagram Edge Chipping Standard 15° 0.12mm No B LF Type E= 0° Negative land width W Rake Face LE Type (No Negative Land) Work Material: VVT Facing LS Type 15° 0.07mm Yes Negative land angle E CBN Tool Cat. No.: 3NU-TNGA160404 HS Type 25° 0.05mm HoningFlank Cutting Conditions: vc = 200m/min, f = 0.1mm/rev, ap = 0.1mm Wet L19 Surface Roughness Rz (μm) Average Burr Height (mm) GoodCutting Edge Sharpness Surface Roughness Ra (μm)