Общий каталог Yamawa 2022 - 2023 - страница 1213

Carbide TapsCarbide Taps 20.20. Carbide TapsCarbide Taps

Technological advances in CNC machines and machining centers, and machining automation have helped improve the overall tapping process.Technological advances in CNC machines and machining centers, and machining automation have helped improve the overall tapping process. YAMAWA was quick to respond to evolving customer needs resulting from technological innovations.YAMAWA was quick to respond to evolving customer needs resulting from technological innovations. We can now recommend carbide taps, which provide tremendous improvements in mass-production and in reducing costs. It is estimated that We can now recommend carbide taps, which provide tremendous improvements in mass-production and in reducing costs. It is estimated that carbide taps have 50 times more durability than HSS taps in tapping, when used properly. YAMAWA engineering believes the best carbide materials carbide taps have 50 times more durability than HSS taps in tapping, when used properly. YAMAWA engineering believes the best carbide materials suitable for taps are ultramicro grain tungsten carbide, or ultrafine grain carbide made of high cobalt.suitable for taps are ultramicro grain tungsten carbide, or ultrafine grain carbide made of high cobalt.

■■Features of Carbide TapsFeatures of Carbide Taps

(1)Excellent durability with high toughness is obtainable.(1)Excellent durability with high toughness is obtainable. (2)High anti-friction features are provided by the material's high hardness and comparatively high toughness, which ultimately results in a longer tool (2)High anti-friction features are provided by the material's high hardness and comparatively high toughness, which ultimately results in a longer tool life.life. (3)Specially designed cutting angle and other dimensional features produce the internal threads with high tolerance accuracy and consistency.(3)Specially designed cutting angle and other dimensional features produce the internal threads with high tolerance accuracy and consistency. (4)Under certain tapping condition, YAMAWA carbide taps can be used even for tapping hard-to-machine materials.(4)Under certain tapping condition, YAMAWA carbide taps can be used even for tapping hard-to-machine materials. ■■Points to note during tapping with Carbide taps:Points to note during tapping with Carbide taps: (1) Machine vibration, or run-out, can lead to Carbide tap chipping and premature failure. Tapping vibrations need to be kept to a minimum.(1) Machine vibration, or run-out, can lead to Carbide tap chipping and premature failure. Tapping vibrations need to be kept to a minimum. (2) Tap holder should be a rigid type for a Carbide tap. A holder attachment with axial float, or radial float tends to promote Carbide tap breakage and (2) Tap holder should be a rigid type for a Carbide tap. A holder attachment with axial float, or radial float tends to promote Carbide tap breakage and chipping.chipping. (3) The hole to be tapped must be located correctly and on center ; any centering off or non-straight drilled hole tends to cause Carbide tap breakage (3) The hole to be tapped must be located correctly and on center ; any centering off or non-straight drilled hole tends to cause Carbide tap breakage due to deflection. Select correct hole depth with respect to tapping length (for blind hole only). It is especially important to prevent tap damage due to deflection. Select correct hole depth with respect to tapping length (for blind hole only). It is especially important to prevent tap damage from chip packing and bottom thrusting in blind hole tapping.from chip packing and bottom thrusting in blind hole tapping. (4) Cutting lubricants - select grade of lubricant. Improper flow of coolant, or lack of sufficient amount of lubricant, or cooling can increase the (4) Cutting lubricants - select grade of lubricant. Improper flow of coolant, or lack of sufficient amount of lubricant, or cooling can increase the likelihood of Carbide tap chipping due to work material welding. Caution must be taken during dry machining to prevent chip welding to the tap.likelihood of Carbide tap chipping due to work material welding. Caution must be taken during dry machining to prevent chip welding to the tap. (5) Work pieces - we provide Carbide taps with increased toughness, but Carbide taps are inferior to High Speed Steel (HSS) in the area of toughness. (5) Work pieces - we provide Carbide taps with increased toughness, but Carbide taps are inferior to High Speed Steel (HSS) in the area of toughness. As a matter of fact Carbide taps have limited application due to this difference in toughness to HSS.As a matter of fact Carbide taps have limited application due to this difference in toughness to HSS.

■■Commonly used materials and cutting conditions.Commonly used materials and cutting conditions.

■■Toughness and Hardness of Cemented Carbide and HSSToughness and Hardness of Cemented Carbide and HSS

Deflective StrengthDeflective Strength (MPa)(MPa) (HRA)(HRA) HardnessHardness

P50P50 UFUF・・AA UFUF・・BB SKH51SKH51 SKH58SKH58

(SKH9)(SKH9) (AISI M7)(AISI M7) Cemented CarbideCemented Carbide HSSHSS

■■Carbide Tap examples and comparison of tool lifeCarbide Tap examples and comparison of tool life

■■Chamfer wear and number of holes of Carbide taps and HSS tapsChamfer wear and number of holes of Carbide taps and HSS taps

Cutting ConditionCutting ConditionCutting ConditionCutting Condition Tap : M5×0.8P4 Tap : M5×0.8P4 Tap : M5×0.8P4 Tap : M5×0.8P4 Chamfer : 3 pitches Chamfer : 3 pitches Chamfer : 3 pitches Chamfer : 3 pitches Machine : Machine with multi spindles Machine : Machine with multi spindles Machine : Machine with multi spindles Machine : Machine with multi spindles Hole Size : Hole Size : Hole Size : Hole Size : φφφφ4.2mm4.2mm4.2mm4.2mm Thread Length : 10mm Through Thread Length : 10mm Through Thread Length : 10mm Through Thread Length : 10mm Through Fluid : water soluble Fluid : water soluble Fluid : water soluble Fluid : water soluble Workpiece : FC250 Workpiece : FC250 Workpiece : FC250 Workpiece : FC250 HSS tapsHSS taps Carbide tapsCarbide taps

Number of holesNumber of holes

Work MaterialsWork Materials Cutting Fluid (General recommendation)Cutting Fluid (General recommendation) (m/min) (m/min) (JIS display lectotype)(JIS display lectotype)

Cast Iron Cast Iron Nodular GraphiteNodular Graphite Light oil, water soluble oilLight oil, water soluble oil Water soluble A1 type 1 issue, A2 type 1 issueWater soluble A1 type 1 issue, A2 type 1 issue

MalleableMalleable Water soluble oilWater soluble oil

BrassBrass Light oil, water soluble oilLight oil, water soluble oil Copper AlloyCopper Alloy

PlasticPlastic ThermoplasticThermoplastic Water soluble oil, airWater soluble oil, air Dry, airDry, air

Note : In all situations, HSS taps being used are standard ones.Note : In all situations, HSS taps being used are standard ones. Carbide taps, when used properly, bring out a long tool life. Carbide taps, when used properly, bring out a long tool life. These datum have come from end users of carbide taps. These datum have come from end users of carbide taps. Technical Inf