Общий каталог Yamawa 2022 - 2023 - страница 724

⑦ Special Thread Taps / Simple Inspection Tools Drill dia. Dc Overall length L Shank dia. Ds Thread + Neck length ℓn JIS ITRD Spiral Fluted Taps (for blind hole) ① JIS Broken Tap Removal Tools Spiral Fluted Taps (for through hole) ② Specification Coating Spiral Pointed Taps (for through hole) ③ Hand Taps ④ ■Product Features ●The unique cutting edge shape is adopted so that a broken high-hardness cutting tap can be removed. The tap can be removed by drilling a hole in its center. ●Wear resistance of the tool is improved by special coating and ultra micro grain cemented carbide resistant to machining the high-hardness HSS tap. ■Machining case 1 (for spiral fluted taps) Cemented Carbide Taps ⑤ Machining conditions Tool condition Tap SP M12×1.75 Machining Depth 15mm Workpiece Material S50C Machine MC BT40, vertical type Tool ITRD Dc8.5 Cutting Fluid Water soluble cutting fluid, (x20) Revolution Speed 450min -1 Internal Thread Accuracy Gauge OK (after retapping) Roll Taps ⑥ Feed Speed 3mm/min（in 0.3 mm steps） Before removal During removal After removal Fragments of removed tap Fragment of Special Thread Taps Simple Inspection Tools internal thread ⑦ on far side Hard to break For a tap with spiral flutes, such as a spiral fluted tap, since lands of the tap are coiled around the internal thread, the tap does not move easily even during Pipe Taps removal and its fragments does not come out easily on the way. Therefore, ITRD is most suitable for the removal of spiral fluted taps (35°or more of helix angle). ⑧ ■Machining case 2 (for hand taps or spiral pointed taps) Tool Tool condition condition Machining conditions ITRD Dc-8.5 Tap HT M12×1.5 Machining Depth 12mm Workpiece Material SCM440 Machine MC, vertical type Thread Mills Premium Thread Mills ⑨ Revolution Speed 460min-1 Cutting Fluid Water soluble cutting fluid, (x20) Feed Speed 3mm/min（in 0.3 mm steps） Fragments Fragments of of removed removed tap tap Before removal Before removal During removal During removal After removal After removal Dies Fragment Fragment ofof ⑩ internal internal thread thread on on entrance entrance side side Easy Easy to to break break Center Drills Centering Tools Remarks: F  or a tap with straight flutes, such as a hand tap or a spiral pointed tap, deeper machining causes lands of ⑪ the tap to bend more easily, and its fragments to come out easily. Therefore, if any tap fragments come out with unusual sound during removal, stop machining and remove the fragments with a scriber or the like. While doing so, proceed with machining carefully. JIS ⑦-79