Общий каталог Yamawa 2022 - 2023 - страница 1222

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, thermosetting nickel base alloy, middle carbon high carbon steel, cast iron, tough aluminum alloy, resin, titanium alloy, heat low carbon steel stainless steel steel heat treated steel of cast iron zinc alloy, brass thermoplastic treated steel of lower trouble lower than 35HRC resin than 35HRC tap wear, cutting ▲ ● ▲ ● ー performance 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-machine material ■ Trouble shooting trouble tap wear, cutting Over-cutting of Shrinkage of Rough surface, Stop line performance welding on tap chipping on tap chip clogging internal threads internal threads Torn threads check point decreased Select machine suitable Use machine Use machine Used machine for tapping size with more power with more power Use tap holder of floating type, Fix workpiece P r eve n t v i b r a t i n g Jigs, Holders firmly o f a x i s o f t a p, P r eve n t c e n te r i n g - o f f w i t h wo r k p i e c e Adjust properly the stroke of tapping Reduce cutting Cutting condition Reduce cutting speed Reduce cutting speed speed, Adjust a feed Change to insoluble oil from water soluble, Use Change to insoluble oil from water soluble, Use Lubricant other cutting oil which prevents cold welding other cutting oil when prevents cold welding Adjust oil volume, supply oil properly Provide deeper Provide deeper tapping hole, tapping hole, Prevent slanting of Use taper reamer 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 Use thread mill Use interrupted Use spiral fluted tap, Use interrupted Selection tap, Use cutters (depending on taps tap interrupted tap materials being cut) Select long Provide oxide Tap shank tap when surface treatment, Reconsider of ejecting chips Change material Provide TiN or Design number of flutes of tap TiCN on taps, interferes with of tap tap holder in the Provide larger 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 ： PT1/4-19 size ： PT1/4-19 tap ： Straight flute tap tap ： Straight flute tap material ： SS400 milling ： 08153X19G machine ： Machining center cutter holder ： fixed type material ： SS400 lubricant ： water soluble machine ： Machining center Information Tapping speed: 5m/min Tapping speed: 2.5m/min Straight flute tap Thread milling cutter Technical Torn threads No torn threads holder ： fixed There is the stop line There is no stop line lubricant ： water soluble Technical-71