Общий каталог Yamawa 2021 - страница 689

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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 Classification 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 Acid resistance Good Normal Excellent Good ROLL Slippery Good Excellent Good Excellent Color Gold Blue Gray - Violet Violet Silver Carbon Steel Hard Steel CARBIDE Workpiece materials Carbon Steel Stainless Steel Stainless Steel 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) Number of tapped holes Number of tapped holes Hole size: Ø 5 mm Hole size: Ø 5.54 mm SPECIAL Tapping Length: 14mm (through hole) Tapping Length: 14mm (through hole) THREADS, Cutting Speed: 30 m/min Cutting Speed: 15 m/min GAUGES 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) CENTER DRILLS Technical info 690