HIGH PERFORMANCE TAPS FOR CUTTING THREADS IN DIFFICULT TO MACHINE MATERIALS

Objectives. This article explores in detail questions of instrument operation function of tapping internal threads in hard materials. The existing relationship between vibration system amplitude and tool durability is indicated; on this basis, it is determined that the best course for improving the durability performance is increasing vibratory resistance. Based on a critical analysis of existing designs with consideration of their flaws, the development of new technological designs of taps is tasked with ensuring stable operation when handling hard materials. Methods. It is noteworthy that one of the main vibration resistance improvement methods of the tool is to reduce the contact area of the tool with the work piece in the cutting zone. Methods are proposed for improving the vibration resistance of taps, considering the correlation adjustment of tap teeth in order to completely eliminate friction at the sides of the thread cutting surface and uneven implementation flute cutting steps. Results. The idea of increasing vibration resistance has seen the new development of vibration-proof tap designs, heralded as innovations due to the accuracy of thread cutting and durability achieved by reducing the thread contact area with the work piece in the cutting zone. Increased vibration resistance is achieved in the modified taps through high correction by means of thread side downgrading of the coarse tap cone by an additional angle of 30º. In another design, the stylus provided with uneven angular spacing. Test results of designed taps machined in corrosion-resistant 1Kh18N9T steel. A manifold increase in tool durability was achieved due to its high vibration resistance. Conclusions. The redesigned taps have a number of advantages, characterised by a high resistance when processing difficult materials and an insignificant increase in the complexity of their manufacture compared with standard taps. Therefore they can be recommended for large-scale implementation in production. 

1. Woods S. Insider trading: evaluating internal threading methods. Cutting Tool Engineering. Northfield, IL. 2014.

2. Emuge. Thread Cutting Technology. Clamping Technology. Toll Catalogue140. EMUGE – Werk Richard Glimpel GmbH & Co. KG Fabrik für Przisionswerkzeuge. 2010. 760 p.

3. Voelkener W. Einfache Berechnung der maximalen Unformkraft beim ge-leiteten Anstanchen. Fertigugstechen und Betr. 1971;21(5):308-309.

4. Pat. DE 3627798 A1 DBR, Int.Cl.4 B23G 5/20. Verfahren und Werkzeug zur Herstellung von Gewindebohrungen. Rolf Klenk GmbH & Co Kg (DBR).

5. Turchan M.C. Combined hole making and threading tool. Pat. 5413438 USA, Int.Cl.6 B23C 3/00; B23G 5/20. (USA).

6. Bergstrom B., Lindberg H., Sandvik A.B.(Sweden). Borr och gangverk tyg. Pat. 456408 Sweden, Int.Cl.4 B23G 5/20. (Sweden);

7. Dreval A.E., Bulakhov P.D., Litvinenko A.V. Razrabotka kombinirovannykh rezboobrazuyushchikh instrumentov. Novyye tekhnologii, oborudovanie, osnastka i instrumenty dlya mekhanicheskoy obrabotki i sborki; Mater. semin. ―Znanie‖ RSFSR. Mosk. dom nauch.-tekhn. prop. M.; 1990. 153-156. [Dreval A.E., Bulakhov P.D., Litvinenko A.V. Development of combined threading tools. New technologies, equipment, tools and instruments for machining and assembly. Proceedings of the seminar of ―Knowledge‖ of the RSFSR. Moscow House of Scientific and Technical Propaganda. Moscow; 1990. 153-156. (In Russ.)]

8. Guseynov R.V. Ob effektivnosti kombinirovannogo instrumenta pri lezviynoy obrabotke otverstiy v trudnoobrabatyvaemykh materialakh. Vestnik mashinostroyeniya. M.; 2001;9:54-56. [Guseynov R.V. On the efficiency of the combined tool in the case of holes' edge cutting machining in the difficult-to-machine material. Russian Engineering Research. Moscow; 2001;9:54-56. (In Russ.)]

9. Guseynov R.V. Intensifikatsiya tekhnologicheskikh protsessov obrabotki trudnoobrabatyvaemykh materialov putem upravleniya dinamicheskimi parametrami sistemy. Avtoreferat dissertatsii na soiskanie uchenoy stepeni dokt. tekhn. nauk. Sankt-Peterburg; 1998. [Guseynov R.V. Intensification of technological processing of the hardly processed materials by the management of system's dynamic parameters. Published summary of PhD thesis. St. Petersburg; 1998. (In Russ.)]

10. Guseynov R.V., Rustamova M.R. Issledovanie protsessa obrabotki otverstiy na osnove nelineynoy dinamiki. Vestnik Dagestanskogo gosudarstvennogo tekhnicheskogo universiteta. Tekhnicheskie nauki. 2014;4:77-80. [Guseynov R.V., Rustamova M.R. Research of hole making process on the basis of nonlinear dynamics. Herald of Daghestan State Technical University. Technical Sciences. 2014;4:77-80. (In Russ.)]

11. Guseynov R.V., Guseynov R.V. Raschetnaya model dinamiki nelineynykh system. Vestnik Dagestanskogo gosudarstvennogo tekhnicheskogo universiteta. Tekhnicheskie nauki. 2015;1(36):24-30. [Guseynov R.V., Guseynov R.V. Design model of nonlinear dynamics. Herald of Daghestan State Technical University. Technical Sciences. 2015;1(36):24-30. (In Russ.)]

12. Guseynov R.V. Narezanie tochnykh rezb. Vestnik mashinostroeniya. M.; 2004;10:4748. [Guseynov R.V. Cutting of exact screw threads. Russian Engineering Research. Moscow; 2004;10:47-48 (In Russ.)]

13. Guseynov R.V., Rustamova M.R. Instrumentalnoye obespechenie tekhnologii obrabotki rezb v zharoprochnykh i titanovykh splavakh. Vestnik Dagestanskogo gosudarstvennogo tekhnicheskogo universiteta. Tekhnicheskie nauki. 2013;28:57-62. [Instrumental support of screw threads' processing technology in heatproof and titanium alloys. Herald of Daghestan State Technical University. Technical Sciences. 2013;28:57-62. (In Russ.)]

14. Guseynov R.V., Rustamova M.R. Obosnovanie bazy dannykh dlya issledovaniya dinamicheskikh protsessov pri rezanii. Vestnik Dagestanskogo gosudarstvennogo tekhnicheskogo universiteta. Tekhnicheskie nauki. 2014;4:36-44. [Guseynov R.V., Rustamova M.R. Database substantiation for the research of dynamic processes at cutting. Herald of Daghestan State Technical University. Technical Sciences. 2014;4:36-44. (In Russ.)]

15. Guseynov R.V., Rustamova M.R. Tekhnologiya narezaniya vnutrennikh rezb pri nalichii radialnykh sil. Vestnik mashinostroyeniya. 2009;5:60-62. [Guseynov R.V., Rustamova M.R. Technology of internal screw thread cutting in the presence of radial forces. Russian Engineering Research. 2009;5:60-62. (In Russ.)].

16. Zharkov I.G. Vibratsii pri obrabotke lezviynym instrumentom. L.: Mashinostroyenie; 1986. 180 s. [Zharkov I.G. Vibrations while processing by edge tool. Leningrad: Mashinostroyenie; 1986. 180 p. (In Russ.)]

17. Obrabotka rezaniem zharoprochnykh, vysokoprochnykh i titanovykh splavov. Kollektiv avtorov. M.: Mashinostroyenie; 1972. 200 s. [Cutting of heat proof, high-strength and titanic alloys. Group of authors. Moscow: Mashinostroyenie; 1972. 200 p. (In Russ.)]

18. Guseynov R.V., Zharkov I.G. Metchik. A.S. 1222443 B.I. №2, 1986.

19. Guseynov R.V. Korrigirovannyye metchiki. I.: Mashinostroitel; 1998:2. [Guseynov R.V.Corrected screw cutting tools. I.: Mashinostroitel; 1998:2. (In Russ.)]

20. Guseynov R.V. Metchik. A.S. 2229965. B.I. №5, 1999.

21. Guseynov R.V., Rustamova M.R. Metchik. Patent 2542217. B.I. №5.RF.2015.