Каталог Sumitomo пластины с кубическим нитридом бора Sumiboron - страница 19

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SUMIBORON for Sintered Alloy Machining Sintered Alloy BN7500 Achieves High Precision, and Efficiency Machining of Sintered Alloy ■ General Features High density sintered material made of micro-grained CBN grains provide excellent sharpness and wear resistance for high quality surfaces in sintered alloy finishing. Surface finish using the BN7500 Surface finish using previous CBN ★The previous CBN left white blemishes on the finished surface whereas the BN7500 leaves a better, glossy surface finish. ■ Characteristics ● Excellent for finishing of Sintered Alloy Excellent machined surface finish and surface appearance. ● Available with 5 different types of edge treatment for machining sintered alloys of any shape or hardness The LF type has a sharper edge designed specifically for machining sintered alloys 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 LE edge treatment, which emphasizes superior surface finish. The LS Type, excelling in fracture resistance and cutting edge balance, also supports finishing that includes light interrupted cutting. ■ Cutting Performance 10 0.6 ● Early Milling Finishing Surface Roughness Previous CBN standard 0.8 Surface Roughness, Ra (μm ) Surface Roughness, Rz (μm ) Previous CBN Sharp Edge 0.5 Average Burr Height (mm) 8 Standard LS type LF type LE type 0.4 BN7500 6 standard 0.6 0.3 4 BN7500 LF type Excellent surface finish and stability 0.2 BN7500 0.4 LF type R Honing 2 Control Variations in Early Surface Roughness 0.1 50% reduction in burr height 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 ★Able to control early surface roughness Work Material : Sintered ferrous alloy SMF4040 equivalent (70HRB, Continuous cut) Work Material: Sintered ferrous alloy SMF4040 equivalent (70HRB, Continuous cut) Insert : 2NU-CNGA120408LF Insert : 2NU-CNGA120408LF 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 variations by applying R honing to the edge. ● Feed and Burr Relationship ■ Recommended Edge Treatment A Good L No R Honing LF type Tool Feed Direction (Burr Control Emphasis) B LE type SUMIBORON When LS type Work Rotation Direction Withdrawn R Honing Standard Cutting Edge Sharpness ★ The LF Type without R honing has a cutting edge sharpness superior to the LE Type with R honing and can control burrs better. (Surface Roughness Emphasis) ★ For a feed rate 0.1 mm/rev or higher, 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 Emphasis) Diagram Interruption degree Frequent A α Burr W Honing Diagram Edge Chip Standard 15° 0.12mm No LF type α = 0° Negative land width W Rake Face B LE type (No Negative Land) Negative land angle α Work Material: VVT Facing LS type 15° 0.07mm Yes CBN Layer Honing Insert: 3NU-TNGA160404 HS type 25° 0.05mm Flank Cutting Conditions: vc=200m/min, f =0.1mm/rev, ap=0.1mm, Wet L19