Общий каталог Sumitomo 2018 - 2019 - страница 491

Предыдущая страница Следующая страница

Навигация

Uncoated SUMIBORON PM Sintered Compoment BN7500 Uncoated CBN grade for high precision and high efficiency machining of powdered metal - 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 l Excellent for finishing of powdered metal Excellent machined surface finish and surface appearance. l 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. - Cutting Surface Roughness Comparison Burr Comparison (Average Height) Performance Previous CBN standard Previous CBN (Sharp cutting edge) BN7500 Standard BN7500, LF Excellent surface finish and stable tool life BN7500, LF 50% reduction in burr height Cutting Length (m) Cutting Length (m) Work material: Sintered ferrous alloy, SMF4040 equivalent Work material: Sintered ferrous alloy, SMF4040 equivalent (HRB70, Continuous cut) (HRB70, Continuous cut) Insert type: CNGA 120408 LF-NU2 Insert type: CNGA 120408 LF-NU2 Cutting data: vc = 200 m/min, f = 0,1 mm/rev, doc = 0,1 mm, Wet Cutting data: vc = 200 m/min, f = 0,1 mm/rev, doc = 0,1 mm, Wet Feed and Burr Relationship - Recommended Edge Treatment Tooling LF type Standard No R HoningLF TypeBurr control New LE Type New LSType R Honing Standard Surface roughness R Honing HS Type Breakage control Interruption Frequent The LF Type without negative land has a cutting edge sharpness superior to the α w R standard type and can control burrs better. Standard 15° 0,12mmLF typeα = 0°No w Work material: VVT FacingInsert type:TNGA 160404 NU3 LE type (No neg. Land) αLS type15°0,07mmYesR Cutting data: vc = 200 m/min, f = 0,1 mm/rev, doc = 0,1 mm, Wet HS type 25° 0,05mm Round honing cutting edge L20 SUMIBORON (µm)Surface Roughness Rz (mm)Burr Height GoodSharpness of Edge