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Cutting Tools
2
Surface finishing
Surface finishing processes compared
Tools made of high speed steel or carbide because of their generally good basic properties are supplied with a bright finish
without extra surface treatment. For special applications it is recommended that tools are optimised for diverse applications at
surface finishing processes, to achieve the following goals:
Titanium-nitride coating
TiN
Titanium-nitride is a gold-coloured protective layer applied by
a PVD process (Physical Vapour Deposition). Higher hardness
combined with a lower friction coefficient achieves a significantly
longer service life and improved cutting performance. TiN coating is
primarily used for drills and thread bores.
Titanium carbon-nitride coating
TiCN
Titanium carbon-nitride is a wear-protection layer applied by PVD,
being harder than TiN and having a lower friction coefficient. Tool
performance is increased through greater hardness and ductility
combined with improved wear.
The TiCN coating is primarily used for NC drill bits, thread bores
and end mills.
Titaninum aluminium-nitride coating
TiAIN
Titanium aluminium-nitride is a multi-layer ceramic coating
applied using the PVD method. The resulting greater hardness and
oxidation stability make this coating ideal for higher speeds and
feed rates for extended tool life.
The TiAlN coating is used mainly in drilling and milling machine
processes, and is also recommended for dry processing.
Titaninum aluminium-nitride S coating
TiAlN-S
This coating is particularly recommended for machining hardened
materials (> 70 HRC). It is used mainly for end mills and is
characterised by high wear resistance. Dry machining is also
possible as is HSC machining.
Diamond coating
Diamond
This coating is particularly suitable for the processing of reinforced
plastics, aluminum and copper alloys.
The friction coefficient on steel is very low.
– Extension of the tool's life
– Reduced cutting force
– Increased cutting speed and feed rate
– Improved surface finish
– Improved dry processing
– Optimised hard processing
Fire coating (TiAIN/TiN)
Fire
Fire is a TiAIN/TiN multi-layer coating with a gradient structure. The
combined benefits of TiAlN and TiN coatings are very good wear
resistance with high thermal stability, hardness and toughness. In
addition to the conventional wet application, this layer can also be
used for minimum quantity lubrication and dry machining.
Zirconium nitride coating
ZrN
Zirconium-nitride is suitable for machining non-ferrous materials,
and especially for aluminum alloys. This coating is not good for cold
welding of aluminium. Associated with high layer hardness and
oxidation resistance are advantages that increase tool service life
and effective feed rate and cutting speed.
Steam tempering
Steam tempered
Steam tempering is a form of surface processing which reduces
slide resistance and prevents edge build-up. Cold welding can also
be avoided.
Steam tempering is primarily used with drills and thread bores.
Nitriding
Nitrated
Nitriding is a surface machining process that increases hardness
and wear resistance. Particularly for working with highly abrasive
materials such as cast iron, which nitriding is particularly suitable
for.
Nitriding is primarily used with drills and thread bores.
Signum coating (TiALN/SiN)
Signum
Due to the special nano-composite structure with a protective layer
of TiALN and SiN, this coating, with 5500 HV, is one of the hardest
on the market. Particularly for hard machinability materials. High
heat wear resistance combined with high diffusion resistance.
TiN
gold-yellow
single-layer
1 –4
2300
0.50
max. 600°
TiCN
light brown
multi-layer
1 –4
3000
0.40
max. 400°
TiAIN
violet
multi-layer
3
3200
0.55
max. 750°
TiAlN-S
blue
multi-layer
0.5–4
4500
0.45
max. 1200°
Diamond
black
–
0.5–2
5000
0.15
max. 350°
Fire
red
multi-layer
2 –6
3300
0.60
max. 850°
ZrN
light-gold
multi-layer
0.1–3
3400
0.50
max. 900°
grey
surface treatment
max. 5
400
–
max. 550°
silver-grey
surface treatment
20
1300
–
max. 550°
Signum
red-bronze
multi-layer
1 –5
5500
0.55
max. 800°
Surface
Colour
Coating structure
Thickness
Hardness
Friction coefficient
Application
Finish
µm
HV
versus steel temperature
Surface finishing benefits at a glance
TiN
Wear- and diffusion resistance
TiCN
Hardness, toughness
TiAIN
Heat hardness, oxidation stability
Fire
Hardness, toughness, wear resistance
Steam tempered
Lower slippage resistance
Nitrated
Hardness, wear resistance on cast iron
Signum
Extreme hardness, extreme heat resistance
ZrN
High hardness, low friction coefficient
Nitrated
Steam tempered
Cutting Data
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