Обший каталог Yamawa 2016 - 2017 - страница 670

MHCDS

Center Drills for Carbon Steels of Middle Hardness for running at High Speed

Specification

Coating

For icon explanation, refer to P.50

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

Cutting condition [ 3×60°×8 ]

Feed 0.15mm/rev 480 hole cuttings under same Cutting fluid Water soluble oil cutting condition (stated in right).

MHCDS has smaller wear and

edge damage. This tells we can

CD-S ＭＨＣＤＳ continue to use MHCDS further.

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)