Общий каталог Yamawa 2021 - страница 640

Cutting Torque Line

Cutting torque line for diff erent kinds of taps (straight fl uted tap, spiral fl uted tap, spiral pointed tap) is shown below. SP

Type of tap Torque line Description

PO

Plateau is observed since whole chamfer threads 5P enter the workpiece material. Straight fl uted tap ST Plateau is also observed since whole short chamfer 1.5P threads enter the workpiece material. Tapping (1.5 threads) process time is shorter than that of the 5P tap.

ROLL

Spiral fl uted tap pulls out the chips, good choice Spiral fl uted tap (2.5 threads) for blind hole tapping. The cutting torque of spiral fl uted taps is lower than that of the hand taps.

CARBIDE

Spiral pointed tap pushes out the chips forward. It is good choice for through hole use. Cutting Spiral pointed tap (5 threads) torque is the smallest among the diff erent 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 fl uted tap (HT), and spiral fl uted tap (SP), and spiral pointed tap (PO) diff ers, shown in the chart below.

EG (STI)

TAPPING CONDITION 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 fl uted Tap : 100 DRILLS Spiral fl uted Tap : 70-75 Spiral Pointed Tap : 60-65

HT SP PO Technical

(5P) (2.5 threads) (5 threads) info