Conclusions
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1.
A new technique of manufacturing drill rod has been developed and is recommended for adoption. The use of induction heating by high-frequency current is recommended for the final heat treatment. The effectiveness of this technique can be increased considerably in combination with hardening the surface by shotpeening.
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2.
The average service life of drill rod manufactured by the new technique with use of high-frequency heating is three to four times higher than that of drill rod manufactured by the existing technique.
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Literature cited
A. G. Ivanov and E. V. Kruchinina, Increasing the Durability and Productivity of Drill Rods [in Russian], Data Sheet No. 8 (530), Tsentral'nogo Inst. Inform (1951).
M. G. Lozinskii, "Commercial use of induction heating," Dokl. Akad. Nauk SSR, 59-131 (1958).
A. A. Kostyakov and B. A. Markovich, "New mass-produced drill rod," Gornyi Zhurnal, 10, 54 (1970).
Additional information
VNIITS. Moscow Automobile Factory Higher Technical School. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 38–39, February, 1974.
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Larkin, F.R., Kudrya, N.A., Chubilin, A.M. et al. Technique of manufacturing drill rods. Met Sci Heat Treat 16, 134–135 (1974). https://doi.org/10.1007/BF00649787
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DOI: https://doi.org/10.1007/BF00649787