Общий каталог Yamawa 2022 - 2023 - страница 272

② Spiral Fluted Tap Series for through hole Overall length L Thread length ℓ Thread + Neck ℓn length Shank length ℓs Shank dia. Ds Size of square K Length of square ℓk JIS ZET-P Spiral Fluted Taps (for blind hole) ① JIS Spiral Fluted Taps for Titanium Alloys, Through Hole Use (with LH Spiral Flutes) Spiral Fluted Taps (for through hole) ② Specification Spiral Pointed Taps (for through hole) Nitride ③ Recommended Tapping Speeds depending on Materials Titanium alloys チタン合金 5 10〜 Hand Taps ( m / min ) ④ Product Features ●The tap is produced from a high grade powder high speed steel that is excellent in heat resistance and abrasion Cemented Carbide Taps ⑤ resistance applications. ●A left hand spiral flute with a right hand screw thread helps prevent material shrinkage and the chips are pushed forward out of the hole to allow the cutting heat to be carried out. ● Appropriate flute shape for titanium alloy is utilized, and the discharge of chips is made smooth. ● A nitride surface treatment is performed for added wear resistance. Roll Taps ● Considering the shrinkage of the internal screw thread, the tap is produced to a moderate oversize condition. ⑥ Tapping Data Tapping Conditions [M6×1] Workpiece Material Ti-6Aℓ-4V Special Thread Taps Simple Inspection Tools ⑦ Bored Hole Size φ5.0 ZET-P Tapping Length 12mm Can Continue Tapping Speed 8m/min Machinery Type CNC tapping center General Purpose PO Tapping Fluid Water soluble cutting fluid 0 20 40 60 80 100 120 140 Pipe Taps ⑧ （Number of holes processed.） Characteristics of titanium alloy Thread Mills Premium Thread Mills ●It is mainly composed of titanium that has a high strength and is light weight. It has excellent heat resistance. There are ⑨ various kinds of titanium alloys such as Ti - 5Aℓ - 2.5Sn, Ti - 5Ta, and the most popular Ti - 6Aℓ - 4V which is commonly used due to its good characteristics. Examples of problems in tapping Dies ●Titanium alloys have high temperature strength and the thermal diffusion is small, so ⑩ abrupt abrasion occurs on the tap. ●The spring back on internal screw threads may cause diameters to shrink and the tap may be crimped causing breakage. ●Chip welding occurs easily on the cutting chamfer of the tap and the threads flank surface. The finished threads surface of the internal screw thread also becomes rough and coarse. Center Drills Centering Tools ⑪ JIS ②-19