Общий каталог Yamawa 2022 - 2023 - страница 256

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 MHSL Spiral Fluted Taps (for blind hole) ① JIS Z-PRO Spiral Fluted Taps for Carbon Steels of Medium Hardness, Through Hole Use (with LH Spiral Flutes) Spiral Fluted Taps (for through hole) ② Specification <2D Coating Spiral Pointed Taps (for through hole) ③ Recommended Tapping Speeds depending on Materials High carbon steels Alloy steels Thermal refined steels 高炭素鋼 合金鋼 調質鋼 3 15 〜 3 15 〜 3 15 〜 Hand Taps ( m / min ) ( m / min ) ( m / min ) ④ 25〜35HRC Product Features ● High wear-resistant HSS material and special coating for longer tool life ● Unique flute design for stable and smooth chip ejection Cemented Carbide Taps ● Secures appropriate tool projection length to prevent interference with workpieces ⑤ Roll Taps ⑥ Suitable for tapping threads in mold parts Suitable for creating tip mounting threads Tapping Data Special Thread Taps Simple Inspection Tools After tapping 200 holes (The tap can still be used for tapping) ⑦ Tapping Conditions [M2.5×0.45] State of Wear Good internal threads Workpiece Material SCM440（45HRC） Bored Hole Size φ2.1 Tapping Length 5mm Tapping Speed 5m/min Pipe Taps ⑧ Machining center, vertical type Machine (fully synchronized feed) Tapping Fluid Water soluble cutting fluid Tapping examples on the market Thread Mills Premium Thread Mills MHSL Workpiece Material Tapping Condition / Tapping Result ⑨ Material Symbol Bored Hole Size Tapping Length Cutting Speed Feed Tool Life Remarks Nominal Size (Hardness) （mm） （mm） * （m/min） Mechanism Cutting Fluid (Holes/pc) M2.5 × 0.45 SCM440（45HRC） 2.1 4 （1.6D） 2.5 Synchronized Water soluble 300 holes Reduced breakage problems M2.5 × 0.45 SKD61（45HRC） 2.1 5 （2D） 5 Synchronized Water soluble 150 holes or more - (The tap still works well) Dies M4 × 0.7 SCM440（45HRC） 3.4 6 （1.5D） 5 Synchronized Water soluble 351holes Reduced tapping time ⑩ * (D) indicates the ratio of the tapping length to the outside diameter. Measures against tapping-related problems When tapping internal threads in a through hole toward the slanted surface as shown on the left, spot facing as shown on the right is recommended to prevent the occurrence of a broken tap or such other problems. Center Drills Centering Tools Before countermeasures After countermeasures ⑪ Spot facing JIS ②-3