Kyocera - Основной каталог 2011-2012 ENG
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Drilling Diameter (f = 0.3 mm/rev) 2) Comparison with carbide solid drill
1) Comparison with indexable drill
1060 holes 14.03 1060 holes
14.03 14.02
(Kyocera) 14.01 (Kyocera)
14.02
Diameter (mm) of outlet side 300 holes
Diameter (mm) of outlet side14.01940 holes
14.00 (Competitor C)
(Competitor F)
720 holes
(Competitor B)
14.00
13.99 10 20 30 40 50 60 70 140 holes
0 Drilling Time (min)
(Competitor N)
13.99 0 10 20 30 40 50 60 70
Drilling Time (min)
Q&A
Q-3 During deep hole machining using DRC (8D type), dimension variation of diameters has occurred
A-3 at entrance and far (outlet) side possibly due to deection. Is there any countermeasure?
There are some countermeasures as follows to prevent deection (to improve bite of drill).
Countermeasures 1
Increasing the feed rate DRC
14-8D
Increasing the feed rate may keep the processing diameters constant. 14.4
(Estimated rate: Current rate + 0.03 to 0.05 mm/rev) 14.3 f=0.25mm/rev
f=0.30mm/rev
Cutting Dia 14.2
14.1 112 K
C55 (S55C) Vc=80m/min H=112mm
f=0.25mm/rev 0.30 mm/rev 14.0 20 40 60 80 100 120 Drilling
Wet(Internal coolant) 13.9 Drilling depth H (mm)
SS16-DRC140M-8
DC1400M-SC(PR0315) 0
If increasing the feed rate is not possible because rigidity of machine or clamp is weak
Countermeasures 2
Making a center spot
1 Make a center spot using the DRC drill or a commercially available
center drill which has a vertex angle of about 140°.
(If the center drill can be modied, make its vertex angle larger than 140°.)
2 Then drill the hole using the DRC drill (8D type). DRC DRC DRC
14-8D 14-3D 14-8D
Diameter (mm) 14.4 Without spot drilling 0.5Dc or more
S55C Vc=80m/min 14.3
f=0.25mm/rev H=112mm 14.2 With spot drilling More than
14.1 half of the
Wet(Internal coolant) 14.0 20 40 60 80 100 120 drilling
SS16-DRC140M-3 13.9 Drilling depth H (mm) diameter
SS16-DRC140M-8 112
DC1400M-SC(PR0315) 0
Case Studies 112
42CrMo4 (SCM440)
C50 (S50C)
12.5 32 Housing
Flange Vc=83m/min (n=2,400min-1)
Vc=97m/min (n=2,490min-1) H=32mm
H=32mm f=0.24mm/rev
f=0.3mm/rev (Vf=576mm/min)
(Vf=747mm/min) Wet (Internal Coolant)
Wet (Internal Coolant) DC1100M-SC (PR0315)
DC1250M-SC (PR0315)
SS14-DRC120M-3 3,000holes/insert SS12-DRC110M-3 2,400holes/insert
Competitor A 1,800holes/drill Competitor B 2,000holes/drill
Compared to competitor’s drill A, MagicDrill DRC type has reduced burr and reduced more than Compared to competitor’s solid drill B, MagicDrill DRC type has greatly reduced preparation time with its easy insert
10% of the power required. Tool life has also improved greatly. replacement feature. Also, the costs of spare tools for re-grinding has been reduced, and tool life has improved.
(Evaluation by the user) (Evaluation by the user)
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