Общий каталог Yamawa 2022 - 2023 - страница 1210

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19. Surface Treatment 19. 19.

■Nitriding

○In this treatment, we have Nitrogen and Carbon soak into the surface of HSS tools, and react with chemical of HSS material to produce hard nitride.High speed cutting and hard-to-machine material cutting are the recent technology. To meet this tendency, the hard layer coating by vapor deposi-
There are 3 methods in the treatment, composition gas method, salt bath nitride method and ion nitride method.tion over tool's surface has become popular. There are two coating methods, CVD and PVD. PVD is mainly used for tap.
○Salt bath nitride treatment is shifted into gas nitride treatment method because of cyanic environmental pollution.■Physical Vapor Deposition
○The temperature of treatment is 500 to 550 degree. Hardness and depth of the treatment can be controlled by active nitrogen concentration and
reaction time.○Inside of the container of high vacuum, are vapor deposition materials heated. And we vapor-deposit particles ionized by electric discharge on
○The high hardness of tool surface minimizes chemical attraction. Result is less welding and friction reduction. Great improvement is expected intool's surface.
tool's performance.○Due to its low reaction temperature (lower than 500˚C), PVD makes little change in shape and hardness of HSS tools.
○We have found out the best combinations of hardness and toughness through our treatment technology○We have adopted iron plating method, and are coating thin layer (1-4um) over our HSS and carbide tools. The layer processed by this method is
○The nitride treatment will be widely applicable to the taps for such workpiece materials as gray cast irons, special cast irons, aluminum diecastingsvery high in its adherence and its wear resistance.
with higher silicone content, copper alloys, and resinoids (plastics). These materials produce small segmental chips and are very abrasive.
○We combine nitrogen and oxidizing for comparatively sticky material such as thermal refined steels of high carbon steel and alloy steel. This double
treatment improves the chipping resistance and have won good reputation.■The features and classification of coating
Titanium nitride aluminum Classification
Chromium nitride (CrN) Titanium carbonitride (TiCN) Titanium nitride (TiN)
(TiAIN) Features
Vickers Hardness
Wear resistanceGoodExcellentExcellentNormal
■Depth and hardness of Nitride Surface Treatment■Comparison between bright and nitride treated
Welding resistanceGoodGoodGoodExcellent
Heat resistanceGoodNormalExcellentExcellent
Cutting conditionAcid resistanceGoodNormalExcellentGood
SlipperyGoodExcellentGoodExcellent
Tap : Plug tap FC-HT M8×1.25
Treatment ABlue Dray
Treatment BMaterial : FC250ColorGoldVioletSilver
Violet
Treatment CHole size : φ6.8mm
Carbon SteelsCarbon SteelsStainless SteelsCopper
Aluminum forgingHard SteelsCast Irons

Tapping Length : 12mm (through hole) Workpiece materials Stainless Steels Tapping Speed : 12m/min Aluminum forging Cast Irons

Cutting oil : Water Soluble cutting oil (×20) Brass・Bronze Tapping Machine : CNC tapping machine 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.

surface FC-HT design FC-HT

(Nitride treated) Depth from the surface (Bright)

■Comparison between bright and TiN coated■Comparison between bright and TiCN coated
Tapping conditionTapping condition
Tap : F-SL P2 M6×1Tap : N-RS G7P M6×1
Work piece : S45C (213~222HB)Work piece : ADC12
Hole size : φ5mmHole size : φ5.54mm
Tapping Length : 14mm (through hole)Tapping Length : 14mm (through hole)
Cutting Speed : 30m/minCutting Speed : 15m/min
Fluid : Water Soluble cutting oilFluid : Water Soluble cutting oil
Machine : CNC tapping machine Machine : CNC tapping machine
F-SL designF-SLN-RS designN-RS design
(Bright)(TiN coated)(Bright)(TiCN coated)

Technical Inf