Page 122 - TURNING CATALOG p121-254

ISOTURN INSERTS USER GUIDE

Edge Preparation and Recommended Applications

T-Land Sizes for Standard Items Silicon Nitride for Cast Iron and
High Temperature Alloys
Grade T (mm) a°
0.20 25° What is ISCANITE?
IN22 0.20 25° ISCANITE is a cutting tool material containing over
IN23 0.20 25° 90 percent silicon nitride. ISCANITE is produced by
IS80 0.20 25° unique hot pressing methods to achieve full density,
IS8 0.10 25° and provides superior toughness along with high
IS9 0.20 20° thermal-shock resistance. These characteristics make
IN11 0.14 20° ISCANITE an ideal cutting tool material with impact
IB50 0.14 20° resistance near that of coated carbides, and the heat
IB55 0.14 20° and wear resistance of aluminum-oxide ceramics.
IB85 0.14 20°
IB90 0.20 25° Which material can ISCANITE machine?
IS6 0.10 25° ISCANITE is primarily used on cast iron and high
IW7 0.2 25° temperature alloys, brass and composites. Steel
IN420 is the only material usually avoided because
of various chemical incompatibilities.
sharp For finishing and
super finishing ISCANITE Benefits
ISCANITE will increase your productivity, reduce
F your machining costs and can drastically reduce
tool forces. ISCANITE increases productivity through
r0.03-0.04 For semi-finishing and additional metal removal rates and can fully utilize the
finishing f < 0.2 mm/rev machine’s potential. Machining costs are reduced
with increased tool life, along with less downtime
E for indexing, gauging, and adjustments.

T For semi-roughing and Cutting Speed and Cutting Force
It is preferable to machine at higher cutting speeds and
roughing f > 0.2 mm/rev lower cutting forces (Point A is preferred over Point B.)
In this case, pressure is reduced on the workpiece and
α° any tendency of the workpiece to move or vibrate. If the
available machine power is higher, or the machine can
T be stepped up, the use higher cutting speeds
of 750 m/min is possible, with the same cutting
T For heavy roughing and force as at Point B. (See Point C.) The positive
influence of the cutting speed and feed on machining
interrupted cutting conditions: higher cutting speeds are recommended
and possible for silicon nitride inserts.
α° r0.03-0.04
fc
S (N)
6000

5000

4000

Cutting Force 3000 75kW
2000
1000 BC

37kW

18.75kW

7.5kW

A

Vc
0 150 300 450 600 750 900 1050 1200 1350 1500 (m/min)

Cutting Speed

242 ISCAR