Page 692 - Yamawa_European_Catalogue_YEU21

15. Surface Treatment

Intro

Hard coating
SP High speed cutting and hard-to-machine material cutting are the recent technology. To meet this tendency, the hard layer coating by vapor
deposition over tool’s surface has become popular. There are two coating methods, CVD and PVD. PVD is mainly used for tap.

Physical Vapor Deposition
SL • Inside of the container of high vacuum, are vapor deposition materials heated. And we vapor-deposit particles ionized by electric
discharge on tool’s surface.
• Due to its low reaction temperature (lower than 500˚C), PVD makes little change in shape and hardness of HSS tools.

PO The features and classification of coating
Classifi cation
Titanium nitride aluminium
Titanium nitride (TiN) Titanium carbonitride (TiCN) Chromium nitride (CrN)
(TiAIN)
Features
ST Vickers Hardness 2000-2400 3000-3500 2300-2700 1800-2200
Wear resistance Good Excellent Excellent Normal
Welding resistance Good Good Good Excellent
Heat resistance Good Normal Excellent Excellent
ROLL Acid resistance Good Normal Excellent Good
Slippery Good Excellent Good Excellent
Color Gold Blue Gray - Violet Violet Silver
Carbon Steel
Hard Steel
CARBIDE Carbon Steel Stainless Steel Stainless Steel
Workpiece materials Copper
Aluminum forging Aluminum forging Cast Iron
Cast Iron
Brass, Bronze
Note: Evaluation (tri-level) of characteristic features is just comparative of these four coatings, TiN, TiCN, TiAlN, and CrN, in the table. These coatings have great advantages of wear resistance,
LONG welding resistance, and friction reduction. The values of vickers hardness are also higher than the heat treatment or nitriding of HSS cutting tools from the table.

HAND
TAPS Comparison between bright and TiN coated Comparison between bright and TiCN coated

EG (STI) CUTTING CONDITION CUTTING CONDITION
Tap: F-SL M6×1 ISO2X(6HX) Tap: N-RS M6×1 ISO2X(6HX)
Work piece: Ck45 (213~222HB)
Work piece: AlSi9Cu3(Fe)
SPECIAL Hole size: Ø 5 mm Hole size: Ø 5.54 mm
Tapping Length: 14mm (through hole)
Tapping Length: 14mm (through hole)
THREADS, Cutting Speed: 30 m/min Cutting Speed: 15 m/min
GAUGES Number of tapped holes Fluid: Water Soluble cutting oil Number of tapped holes Fluid: Water Soluble cutting oil
Tapping Machine: CNC tapping machine
Tapping Machine: CNC tapping machine
THREAD
MILLS

DIES F-SL design F-SL N-RS design N-RS design
(Bright) (TiN coated) (Bright) (TiCN coated)

CENTER
DRILLS

Technical
info

690