Обший каталог Yamawa 2016 - 2017 - страница 839

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21. Taps for Pipe Threads 3. Troubles on taper pipe thread tapping, and their solution Description of products Taper pipe thread tapping such as for PT thread and for NPT thread is quite different from parallel thread tapping such as for metric thread. There, the trouble particularly special in taper thread tapping tends to happen. Following is the explanation about tapping troubles on taper pipe thread tapping and their solution: ■ Materials and troubles material tool steel, alloy steel, nickel base alloy, low carbon steel middle carbon steel high carbon steel, stainless steel cast iron, tough cast aluminum alloy, zinc thermosetting resin, titanium alloy, heat heat treated steel of iron alloy, brass thermoplastic resin treated steel of lower trouble lower than 35HRC than 35HRC tap wear, cutting performace ▲ ● ▲ ● ー decreased welding on tap ● ● ▲ ● ● ー chipping on tap ▲ ▲ ● ● ー rough surface ▲ ▲ ▲ ▲ ● ▲ ▲ ー torn threads ● ● ▲ ● ▲ ー chip clogging ● ● ▲ ー ● Trouble occurs quite frequently　　▲ Trouble occurs rather frequently 　　ー Hard-to-macine material ■ Trouble shooting trouble Over-cutting of Shrinkage of internal Rough surface, Torn tap wear, cutting intenal threads threads threads Stop line performace welding on tap chipping on tap chip clogging check point decreased Select machine Use machine with Use machine with Machine suitable for tapping more power more power size Use tap holder of floating type, Jigs, Holders Fix workpiece Prevent vibrating firmly of axis of tap, Prevent centering- off with workpiece Adjust properly the stroke of tapping Cutting condition Reduce cutting Reduce cutting speed Reduce cutting speed speed, Adjust a feed Change to insoluble oil from water Change to insoluble oil from water Lubricant soluble, Use other cutting oil which soluble, Use other cutting oil when Adjust oil volume, supply oil properly prevents cold welding prevents cold welding Provide deeper Provide deeper Prevent slanting of Use taper reamer tapping hole, tapping hole, On process hole for boring hole Remove Check the viscosity, unnecessary chips Use taper reamer during tapping for boring hole Use spiral fluted Use carbide tap Selection tap, Use interrupted Use thread mill (depending on Use interrupted Use spiral fluted tap, Use interrupted tap cutters materials being taps tap cut) Tap Provide oxide Select long shank Reconsider of surface treatment, tap when ejecting Design number of flutes Change material of Provide TiN or chips interferes of tap tap TiCN on taps, with tap holder in Provide larger the case of SP cutting angle tapping ■ Examples of trouble shooting 1) Torn thread trouble was solved by changing cutting speed 2) Stop line trouble was solved by using Thread milling cutter Tapping condition Cutting condition size ： PT 1/4-19 size ： PT1/4-19 Information tap ： Straight flute tap tap ： Straight flute tap Technical material ： Low carbon steel milling ： 08153X19G machine ： Machining center cutter holder ： fixed type material ： Low carbon steel lubricant ： water soluble Tapping speed: 5m/min Tapping speed: 2m/min machine ： Machining center Straight flute tap Thread milling cutter Torn threads No torn threads holder ： fixed There is the stop line There is no stop line lubricant ： water soluble Technical-64 835