Общий каталог Yamawa 2021 - страница 640

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5. Tapping Torque Intro Cutting Torque Line Cutting torque line for different kinds of taps (straight fluted tap, spiral fluted tap, spiral pointed tap) is shown below. SP Tap : HSS ISO2(6H) M8×1.25 Bored hole size : 6.8 mm Cutting speed : 6 m/min Cutting oil : Oil Workpiece material : Ck60 Machine : Drilling machine Tapping type : 10 mm Through hole Measurement equipment : Piezoelectric torque tester SL Type of tap Torque line Description PO Plateau is observed since whole chamfer threads 5P enter the workpiece material. Straight fluted tap ST 1.5P Plateau is also observed since whole short chamfer threads enter the workpiece material. Tapping (1.5 threads) process time is shorter than that of the 5P tap. ROLL Spiral fluted tap pulls out the chips, good choice Spiral fluted tap (2.5 threads) for blind hole tapping. The cutting torque of spiral fluted taps is lower than that of the hand taps. CARBIDE Spiral pointed tap pushes out the chips forward. Spiral pointed tap (5 threads) It is good choice for through hole use. Cutting torque is the smallest among the different tap shapes. LONG The cutting torque changes depending on the kind of taps, cutting chamfer, number of fl utes, workpiece materials and their hardness, lubrication types, and chips. HAND TAPS Comparison of Cutting Torque by Different Type of Taps Cutting torque of straight fluted tap (HT), and spiral fluted tap (SP), and spiral pointed tap (PO) differs, shown in the chart below. TAPPING CONDITION EG (STI) Tap: HSS ISO2(6H) M10×1.5 Cutting speed: 10 m/min Workpiece material: Ck60 SPECIAL Hole condition: 20 mm through hole THREADS, Bored hole size: Ø 8.5, drill GAUGES Lubrication : Straight oil Machine: Radial drilling machine Measurement equipment: Piezoelectric torque tester THREAD MILLS DIES If the cutting torque of straight fluted tap is assumed as 100, the cutting torque of other taps is as follows : CENTER Straight fluted Tap : 100Spiral fluted Tap :70-75 DRILLS Spiral Pointed Tap : 60-65 HT SP PO Technical (5P) (2.5 threads) (5 threads) info 641 Tapping torque