Общий каталог Yamawa 2022 - 2023 - страница 272

JIS ZET-P

Spiral Fluted Taps for Titanium Alloys, Through Hole Use (with LH Spiral Flutes)

Specification

Nitride

Recommended Tapping Speeds depending on Materials

Titanium alloys

5チタン合金10

(m/min)

Product Features

• The tap is produced from a high grade powder high speed steel that is excellent in heat resistance and abrasion 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.
• Considering the shrinkage of the internal screw thread, the tap is produced to a moderate oversize condition.

Tapping Data Tapping Conditions [M6×1] Workpiece Material Ti-6Aℓ-4V

0 20 40 60 80 100 120 140

（Number of holes processed.）

Characteristics of titanium alloy

• It is mainly composed of titanium that has a high strength and is light weight. It has excellent heat resistance. There are 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

• Titanium alloys have high temperature strength and the thermal diffusion is small, so 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.