Общий каталог Yamawa 2022 - 2023 - страница 934

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Spiral Fluted Taps (for blind hole)Spiral Fluted Taps(for through hole)Spiral Pointed Taps(for through hole)Hand TapsCementedCarbide TapsRoll TapsSpecial Thread TapsSimple Inspection ToolsPipe TapsThread MillsPremium Thread MillsDiesCenter DrillsCentering Tools JIS ⑪ Center Drills / Centering Tools Drill Shank Overall Drilldia.dia.lengthlengthDcDsLℓ JIS ① MHCDS Center Drills for Carbon Steels of Medium Hardness for Running at High Speed ② Specification Coating ③ ④ Product Features ●In order to improve positioning accuracy of projection and shank tolerance, MHCDS has the cutting edge only on one end. ●C onsidering 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. 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 wearSmall wear Right pictures show difference of Cutting condition [ 3×60°×8 ] 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 ⑦ edge damage. This tells we can 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. ⑧ 90 135 45 μm Surface roughness of center drilled 60°face 180 0 ⑨ 225 315 100μm 270 0.5 1.0 1.5 2.0 mm ×100 Enlarged picture Circularity of center drilled 60°face ⑩ Recommended cutting condition ●Material : Carbon Steels(S55C) Alloy Steels(SCM440) Designation Dc×θ×Ds Feed( mm/rev ) Revolution speed( min-1) 1×60 ゜×4 3,800 0.1 1.5×60 ゜×5 2,400 ⑪ 2×60 ゜×6 1,9002.5×60 ゜×80.151,500 3×60 ゜×8 1,200 4×60 ゜×10 1,000 5×60 ゜×12 0.2 800 6×60 ゜×16 600 JIS ⑪-35