Общий каталог Yamawa 2022 - 2023 - страница 1157

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Description of productsTechnical Information Tapping Torque ■Tapping Torque of Cutting type Taps The torque starts increasing as the threads of chamfer enter the workpiece material. It becomes highest when all threads of chamfer cut into workpiece material, and is in plateau until the chamfer cuts through the workpiece. After that, the torque will decrease until the end of tapping. ■Cutting Torque Line Cutting torque lines in the test of di erent kinds of taps, hand tap, spiral uted tap, spiral pointed tap are shown below. Tapping Condition Tap : HSS P2 M8×1.25 Bored hole size : 6.8mm Cutting speed : 6.1m/min Cutting oil : Water insoluble oil Workpiece material : S50C Machine : Drilling machine Tapping type : 10mm Through hole Measurement equipment : Piezoelectric torque tester Type of tap Torque lines Description Hand tap (P2) Taper tap (9 threads) Gentle slope is observed because of less cutting by each cutting chamfer, but longer tapping time is taken than in the other hand taps. Plug tap (5 threads) Plateau is observed since whole chamfer threads enter the workpiece material. Tapping time is much shorter than that of the taper tap. Bottoming tap (1.5 threads) Plateau is also observed since whole short chamfer threads enter the workpiece material. Tapping process time is shorter than that of the plug tap. Spiral uted tap (P2, 2.5 threads) Spiral uted tap pulls out the chips, good choice for blind hole tapping. The cutting torque of spiral uted taps is smaller than that of the hand taps. Spiral pointed tap (P2, 5 threads) Spiral pointed tap pushes out the chips forward. It is good choice for through hole use. Cutting torque is smallest in all taps. The cutting torque will change depending on the kind of taps, cutting chamfer, number of utes, workpiece materials and their hardness, lubrication types, and chips. Technical-6