Page 49 - machining_titanium_05_2019

DRILLING TITANIUM

ISCAR provides different tools for drilling titanium that can be divided in two main types: solid
carbide drills (Fig. 26) and assembled drills with exchangeable cutting parts. The latter comprise
drills carrying indexable carbide inserts (Fig. 27) and drills with replaceable cutting heads DRILLING TITANIUM
(Fig. 28, 29). Assembled drills are the most common in machining titanium components.
Table 30-34 show general engineering data of ISCAR’s drill families that are most
used in machining titanium. In drilling titanium, inner coolant supply (through
the tool body) is preferable, and all the drills are suitable for this option.

Table 30 ISCAR’S Drills for Machining Titanium

Diameter range Hole
Family Designation Type Cutting area Z** Mm In Accuracy*
DR-TWIST DR assembled indexable inserts 1 12…60 0.469…2.344 IT12
SUMOCHAM DCN assembled replaceable head 2 6…32 0.236…1.260 IT10-IT9
SOLIDDRILL SCD ACP solid 2 3…20 0.180…0.813 IT10-IT9
* ISO tolerance grades, provided in average cutting conditions
** number of effective cutting edges

Table 31 Cutting Length Series for Indexable Drills DR-TWIST

Diameter d* Cutting length series
Mm In 2×d 3×d 4×d 5×d
12 to 14 0.469 to 0.562
14 up to 24 0.562 up to 0.936

over 24 up to 38 over 0.936 up to 1.500
over 38 up to 60 over 1.500 up to 2.344
* the nominal diameter of a drill.
Table 32 Cutting Length Series for Drills With Replaceable Heads SUMOCHAM

Diameter d* Cutting length series
Mm In 1.5×d 3×d 5×d 8×d 12×d
6 to 8 0.236 to 0.315
8 up to 26 0.315 up to 0.984
over 26 up to 32 over 0.984 up to 1.220
over 1.220 up to 1.260
* the nominal diameter of a drill.

Table 32 Cutting Length Series Table 33 Cutting Length
for Solid Carbide SOLIDDRILL Series for Solid Carbide Drills
Inch Line Drills, Metric Line SOLIDDRILL , Inch Line
Cutting Cutting
Diameter d*, Length series Diameter d*, length series
Mm 3×d 5×d 8×d In 3×d 5×d
3 to 4.9 0.180 up to 0.343
4.9 to 7.8 over 0.343 up to 0.813

7.8 up to 9.9 * the nominal diameter of a drill.
over 9.9 up to 12
over 12 up to 20
* the nominal diameter of a drill.
47