556 Каталог KYOCERA 2017 Инструмент сборный и монолитный для станков Стр.J51

Каталог KYOCERA 2017 Инструмент режущий Стр. J51 0556 Lab2u

Infeed Methods Infeed Methods Features Radial Infeed The most common threading method. The cutting edge moves toward the center of the workpiece every pass. Suitable for relatively small pitch size threading. V-shape chips are generated and chip control may be difficult depending on workpiece material. Flank Infeed Suitable for large pitch size threading. The wear on the right side edge of the figure (no ap) tends to become greater. Chips flow to one side. F 3° ank Compound Infee -5° d Revised compound methods of the above flank infeed method. No “No ap.” condition. Chips flow to one side. Lead Angle of Thread Thread's Lead Angle p as shown in Fig. 1 decides from the Workpiece Diameter “D”(Pitch Dia.) and the Lead “L” (in case of Single-start Thread, it is the same as Pitch “P”). By rolling a right-angled Triangle around a Cylinder and the Angle ACB in Fig. 2 becomes the Lead Angle p. The calculation formula is shown as follows. L tanP = nP rcD p: Lead Angle D: Pitch Dia. n: Number of Thread P : Pitch L : Lead (In case of single-start thread, it is equal to P. In case of n-start thread, it is equal to nxP. CT c T3 (Fig.1) (Fig.2) (Fig.3) Relief Angle of Thread Against this lead angle, the threading insert requires side relief angle a. TNN type threading insert is a negative insert and there is no relief angle. When installing the insert in the toolholder, the edge inclination angle y (Fig. 3) is set, and at the same time front relief angle as well as side relief angle are generated to the insert. Side relief angle is described by the following formula. (Fig.4) tana = tany x tan (2) (Table 1) Symbol e.g.) a : Side Relief Angle y : Inclination Angle after Installing Insert External Insert : 10° Internal Insert : 15° 0 : Insert's Thread Angle Metric : 60° Tapered Pipe : 55° 30° Trapezoidal : 30° T : Insert Thickness X=T siny Y=X tan (0/2)=t t =T cosy tana Inserts Side Relief Angle a External Internal 60° Thread (M, UN, NPT) 5° 49' 8° 47' 55° Thread (W, G, PT) 5° 14' 7° 56' 30° Trapezoidal (Tr) 2° 43' 5° 7' Ref. to Table 1 for the Side Relief Angle depending on the insert type. However, the side relief angle is set for 1° in the traveling direction by the toolholder itself, so that the actual side relief angle becomes a+1°. J51