INFLUENCE OF SELF-TAPPING SCREW ELECTRO-ARC MACHINING ON ITS TWISTING-IN IN SPECIMENS MADE OF VARIOUS MATERIALS AND TWISTING-OUT PROCEDURE
Abstract
The paper provides an experimental evaluation pertaining to the influence of steel self-tapping screw on its twisting-in specimens made of various materials and its twisting-out process. Main principles of the investigation methodology including description of technological scheme of self-tapping screw electro-arc machining and specimens applied while executing the experiments and hardware measuring tools used for fixation of torque which has been applied to the self-tapping screw during its twisting-in in the specimen and its twisting-out process have been presented in the paper. It has been established that the self-tapping screw electro-arc machining initiates formation of dimples (holes) which have solidified metal flows along their edges. The flows give a cutting ability to the screw and so they exert an influence on the conditions of screw’s interaction with the specimen during its twisting-in and twisting-out processes.
The paper presents results of experimental investigations that demonstrate an impact of self-tapping screw electro-arc machining on its twisting-in in the specimens made of various materials and twisting-out procedure. In particular, it has been ascertained that torque value applied to the self-tapping screw with modified surface during twisting-in process is less in comparison with the self-tapping screw having an initial state of its surface and in the case of its twisting-out process the value is higher. In this respect difference between the indicated torque values is increasing when material hardness of the specimen becomes higher.
About the Authors
M. G. KiselevBelarus
Professor, PhD in Engineering
A. V. Drozdov
Belarus
Associate Professor, PhD in Engineering
S. G. Monich
Belarus
Graduate student
P. S. Bogdan
Belarus
Graduate student
References
1. Wang, Z. L., Fang, Y., Wu, P. N., Zhao, W. S., Cheng, K. (2002). Surface modification process by electrical discharge machining with a Ti powder green compact electrode. Journal of Material Processing Technology, 129 (1-3), 139-142. doi:10.1016/S0924-0136(02)00597-6.
2. Harris, W. (1995). The Problem of Osteolysis. Clinical Orthopaedics and Related Research, 311, 46–53. PubMed ID: 7634590
3. Sirak, S. V., Petrikova, M. G. (2014). Microscopic study of screw dental implant for osteo-integration forecasting. Mezhdunarodnyi zhurnal prikladnykh i fundamental'nykh issledovanii [International Journal of Applied and Fundamental Investigations], 2, 162–168 (in Russian).
4. Mohri, N., Saito, N., Tsunekawa, Y., Kinoshita, N. (1993). Metal Surface Modification by Electrical Discharge Machining with Composite Electrode. CIRP Annals - Manufacturing Technology, 42 (1), 219–222. doi: 10.1016/S0007-8506(07)62429-9.
5. Kumar, S., Singh, R., Singh, T. P., Sethi, B. L. Surface Modification by Electrical Discharge Machining: A review. Journal of Materials Processing Technology, 209, 3675–3687. doi:10.1016/j.jmatprotec.2008.09.032.
6. Kiselev, M. G., Drozdov, A. V., Moskalenko, A. V., Bogdan, P. S. (2012). Theoretical substantiation of rational parameters for electro-arc machining of wire tool. Vestn. Gomel'skogo gos. tekhn. un-ta imeni P. O. Sukhogo [Bulletin of Sukhoi State Technical University of Gomel], 3, 3–10 (in Russian).
7. Kiselev, M. G., Drozdov, A. V., Moskalenko, A. V., Bogdan, P. S. (2012). Modification of initial wire tool surface with the purpose to provide cutting ability to it while using electro-arc machining. Vestnik Belorussko-Rossiiskogo universiteta [Bulletin of Belarusian-Russian University], 1(34), 13–22 (in Russian).
8. Foteev, N. K. (1980). Technology of electric erosion machining. ?oscow, Mashinostroyenie. 184 p. (in Russian).
9. Petrov, Iu. N., Dekhtiar', L. I., Safronov, I. I. (1965). Influence of technological regimes of mechanized electro-spark doping on the quality of the obtained surface. Elektonnaya obrabotka materialov [Electronic material machining], 3, 45–49 (in Russian).
10. Sokolov, I. ?. (1975). Mechanization of electro-spark doping process. Elektonnaya obrabotka materialov [Electronic material machining], 1, 33–34 (in Russian).
Review
For citations:
Kiselev M.G., Drozdov A.V., Monich S.G., Bogdan P.S. INFLUENCE OF SELF-TAPPING SCREW ELECTRO-ARC MACHINING ON ITS TWISTING-IN IN SPECIMENS MADE OF VARIOUS MATERIALS AND TWISTING-OUT PROCEDURE. Science & Technique. 2015;(5):3-9. (In Russ.)