Investigation of the Effects on Screw Thread of Infeed Angle during External Threading

Abstract

This paper presents the effects of the infeed angles in terms of the surface analysis and cutting force components upon thread quality in the external threading operations. Threading operations were carried out on a CNC lathe by single-point cutting tools for 0º, 14.5º, 15º, 27.5º and 30º infeed angles at the constant cutting speed of 100 m/min. The main cutting force and the radial force were determined as considerable force components in terms of energy consumption after threading processes. It was also determined that the microhardness increased toward from thread crest to thread root throughout the flanks. According to experimental results and the surface analysis, it was found that the optimum infeed angle was 30º in external threading

Keywords

• External threading, infeed angles, cutting forces, surface analysis

References

1. Amstead, B.H., Manufacturing processes, 8th ed. Wiley, New York, 578-581, (1987).
2. Araujo, A.C., Silveira, J.L., Kapoor, S., “Force prediction in thread milling”, Journal of the Braz Soc. of Mech. Sci. & Eng., 26 (1): 82-88, (2004).
3. Smith, G., Advanced Machining: The handbook of cutting technology, IFS Publications, UK, (1989).
4. Badami, V.G., Hege, R.E., Patterson, S.R., “A novel method for forming fine-pitch threads in Superinvar”, Precision Engineering, 27: 87-90, (2003).
5. Degarmo E P, Tample B J & Kosher R A, Materials and processes in manufacturing, Macmillan Publishing Company, New York, (1988).
6. Birger, I.A., “Using multidimensional strength criteria for determining the probability of failure”, Strength Mater, 16 (11): 1520-1525, (1984).
7. Suzuki, T., Ariura, Y., Umezaki, Y., “Basic study on cutting forces in gear cutting”, JSME Inter Journal Series C, 36 (4): 543-548, (1993).
8. Black, S.C., Chiles, A., Lisseman, A.J., Martin, S.J., Principles of Manufacture, Third ed., Arnold Book Company, London, (1996).

9. Gunay, M., Aslan, E., Korkut, I., Seker, U., “Investigation of the effect of rake angle on main cutting force”, Int J Mach Tools Manuf, 44: 953-959, (2004).
10. Ezugwu, E.O., Okeke, C.I., “Tool life and wear mechanisms of TiN coated tools in an intermittent cutting operation”, J Mater Process Technol, 116: 10-15, (2001).
11. Sasahara, H., “The effect on fatigue life of residual stress and surface hardness resulting from different cutting conditions of 0.45%C steel”, Int J Mach Tools Manuf, 45: 131-136, (2005).
12. Akyıldız, H.K., Fetullayev, E.K., Livatyalı, H, “Effects of machining conditions and tool wear on the fatigue strength of threaded parts”, J Eng Istanbul Tech Univ, 5(2): 145-156, (2006).
13. Savkin, A.N., “Assessing the reliability of thread joints under variable loads”, J Machin Manuf Reliab, 36(4): 336-40, (2007).
14. Fetullazade, E., Akyıldız, H.K., Sarıtas, S., “Effects of the machining conditions on the strain hardening and the residual stresses at the roots of screw threads”, Materials and Design, 31: 2025 2031, (2010).
15. Akyıldız, H.K., Livatyalı, H., “Effects of machining parameters on fatigue behavior of machined threaded test specimens”, Materials and Design, 31: 1015-1022, (2010).
16. Nalbant, M., Günay, M., Yıldız, Y., “Modelling of the effect of different infeed angles and cutting areas on the cutting forces in external threading”, Turkish J. Eng. Env. Sci. 32: 153-161, (2008).
17. Sandvik Coromant, Metalcutting Technical Guide, Turning Tools, Sweden, (2005).
18. Lindberg R A, Processes and Materials of Manufacture, Fourth ed., Prentice-Hall, New Jersey, (1990).
19. Kobayashi, T., Shockey, D.A., “Analysis of failed aircraft wheel assembly”, Engineering Failure Analysis, 13: 65-74, (2006).
20. Fromentin, G., Poulachon, G., Moisan, A., Julien, B., Giessler, J., “Precision and surface integrity of threads obtained by form tapping”, CIRP Annals Manufacturing Technology, 54(1): 519-522, (2005).
21. Bouzid Sai, W., Ben Salah, N., Lebrun, J.L., “Influence of machining by finishing milling on surface characteristics”, Int J Mach Tools Manuf, 41: 443-50, (2001).