Обший каталог Yamawa 2016 - 2017 - страница 670

Center Drills/Centering Tools
Spiral Pointed Taps Spiral Fluted Taps Spiral Fluted Taps
(for blind hole)


MHCDS
Center Drills for Carbon Steels of Middle Hardness for running at High Speed
Specification
(for through hole)


Coating
For icon explanation, refer to P.50
(for through hole)


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.
Hand Taps


●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
Cemented
Carbide Taps


Great extension of tool life with MHCDS
Cutting condition [ 3×60°
×8 ]
Right pictures show difference of Work material S55C
the damage on cutting edge Machine NC lathe
Roll Taps


Cutting speed 30m/min（1,200min-1）
between CD-S and MHCDS after
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
Special Thread Taps
Pipe Taps Simple Inspection Tools


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
Thread Mills


μm Surface roughness of center drilled 60°face
180 0


225 315
100μm
Dies


270
0.5 1.0 1.5 2.0 mm ×100
Enlarged picture Circularity of center drilled 60°face
Center Drills


Recommended cutting condition
●Material : Carbon Steels(S55C) Alloy Steels(SCM440)
Feed f RPM n
Designation Dc×θ×Ds ( mm/rev ) ( min-1 )
1×60゜×4 3,800
0.1
×5
1.5×60゜ 2,400
Centering Tools


2×60゜×6 1,900
×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
CE-27
666 For improvement, spec may change without advance notice.