Общий каталог Yamawa 2022 - 2023 - страница 934

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JIS MHCDS

Center Drills for Carbon Steels of Medium Hardness for

Running at High Speed

Specification

Coating

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. ●Increased centrality leads to great improvement of surface finish and circularity of center-drilled hole.

Cutting Data

Great extension of tool life with MHCDS<After drilling 480 holes><After drilling 480 holes>
Large wearSmall wear
Right pictures show difference ofCutting condition [ 3×60°×8 ]
the damage on cutting edgeWork materialS55C
between CD-S and MHCDS afterCutting speed30m/min (1,200min-1)
Feed0.15mm/rev
480 hole cuttings under same
MachineNC lathe
cutting condition (stated in right)Cutting FluidWater soluble cutting fluid

MHCDS has smaller wear and 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. 90 135 45 μm Surface roughness of center drilled 60°face 180 0

225 315 100μm 270

0.5 1.0 1.5 2.0 mm ×100

Enlarged picture Circularity of center drilled 60°face Recommended cutting condition ●Material : Carbon Steels(S55C) Alloy Steels(SCM440)

Designation Dc×θ×DsFeed (mm/rev)Revolution speed (min-1)
1×60゜×4013,800
1.5×60゜×5.2,400
2×60゜×61,900
2.5×60゜×80.151,500
3×60゜×81,200
4×60゜×101,000
5×60゜×120.2800
6×60゜×16600