Общий каталог Yamawa 2022 - 2023 - страница 934

⑪ Center Drills / Centering Tools Drill dia. Dc Shank dia. Ds Overall length L Drill length ℓ JIS MHCDS Spiral Fluted Taps (for blind hole) ① JIS Center Drills for Carbon Steels of Medium Hardness for Running at High Speed Spiral Fluted Taps (for through hole) ② Specification Coating Spiral Pointed Taps (for through hole) ③ Hand Taps ④ Product Features ●In order to improve positioning accuracy of projection and shank tolerance, MHCDS has the cutting edge only on one end. ●Considering clearance between center point and bottom of center hole, cutting edge length (ℓ) is made as short as possible to increase toughness. ●To increase centrality, drill point has 3 rakes and X thinning design, which enables high speed cutting and feeding. Cemented Carbide Taps ⑤ ●Increased centrality leads to great improvement of surface finish and circularity of center-drilled hole. Cutting Data Great extension of tool life with MHCDS Large wear Small wear Cutting condition [ 3×60° ×8 ] Roll Taps Right pictures show difference of ⑥ the damage on cutting edge Work material S55C between CD-S and MHCDS after Cutting speed 30m/min (1,200min-1) Feed 0.15mm/rev 480 hole cuttings under same Machine NC lathe cutting condition (stated in right) Cutting Fluid Water soluble cutting fluid MHCDS has smaller wear and Special Thread Taps Simple Inspection Tools edge damage. This tells we can ⑦ continue to use MHCDS further. CD-S MHCDS Great improvement in surface roughness and circularity with MHCDS Under the cutting condition stated above, the surface finish of center-drilled hole has greatly been improved. Circularity of center drilled hole as well as run-out tolerance of turning axis has been improved. Pipe Taps ⑧ 90 135 45 μm Surface roughness of center drilled 60° face 180 0 Thread Mills Premium Thread Mills ⑨ 225 315 100μm 270 0.5 1.0 1.5 2.0 mm ×100 Enlarged picture Circularity of center drilled 60° face Dies ⑩ Recommended cutting condition ●Material : Carbon Steels(S55C) Alloy Steels(SCM440) Feed Revolution speed Designation Dc×θ×Ds (mm/rev) (min-1 ) 1×60゜×4 3,800 0.1 ×5 1.5×60゜ 2,400 Center Drills Centering Tools 2×60゜×6 1,900 ⑪ ×8 2.5×60゜ 0.15 1,500 3×60゜×8 1,200 4×60゜×10 1,000 5×60゜×12 0.2 800 6×60゜×16 600 JIS ⑪-35