Общий каталог Yamawa 2022 - 2023 - страница 724

Drill Overall Shank Thread + Neck

JIS ITRD Broken Tap Removal Tools

Specification

Coating

■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)

Machining conditions Tool conditionTool condition

Before removalBefore removal During removalDuring removal After removalAfter removal Fragments of removed tapFragments of removed tap

Fragment of Fragment of internal thread internal thread on far sideon far side Hard to breakHard 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 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). ■Machining case 2 (for hand taps or spiral pointed taps) Tool conditionTool condition Machining conditions ITRD Dc-8.5

Before removalBefore removal During removalDuring removal After removalAfter removal

Fragment of Fragment of internal thread internal thread on entrance sideon entrance side

Easy to breakEasy to break Remarks: For a tap with straight flutes, such as a hand tap or a spiral pointed tap, deeper machining causes lands of 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.