Общий каталог Yamawa 2021 - страница 689
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Каталоги Yamawa твердосплавные метчики для закаленной стали
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 Features | Titanium nitride (TiN) | Titanium carbonitride (TiCN) | Titanium nitride aluminium (TiAIN) | Chromium nitride (CrN) |
| 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 |
| Acid resistance | Good | Normal | Excellent | Good |
| Slippery | Good | Excellent | Good | Excellent |
| Color | Gold | Blue Gray - Violet | Violet | Silver |
| Workpiece materials | Carbon Steel Aluminum forging | Carbon Steel Hard Steel Stainless Steel Aluminum forging Cast Iron Brass, Bronze | Stainless Steel Cast Iron | Copper |
LONG 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, 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 |
| THREADS, | Tapping Length: 14mm (through hole) | Tapping Length: 14mm (through hole) |
| GAUGES | Cutting Speed: 30 m/min | Cutting Speed: 15 m/min |
Fluid: Water Soluble cutting oil 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) |