Abstract
The methodology and results of experimental studies on possibility to reduce residual stresses in the mandrelled cylinders of steel grade 45 (0.45% C) with 5 mm diameter hole and with a wall thickness ratios 2 and 3 by plastic tension are presented in the article. It is found that even when the axial tensile plastic deformation is 0.005 significant decrease in the district of residual stresses in these cylinders occurs; with deformation increasing up to 0.015…0.020 county residual stresses are reduced in magnitude from 140…500 MPa to 30 ... 50 MPa. The relationships calculated to estimate accuracy of diametric dimensions of the cylinders after plastic tension are given. It is shown that plastic tension of mandrelled cylinders reduces accuracy of holes with a diameter less than 5 mm by less than one accuracy grade. It is noted that the considered method of reducing residual stresses is the most appropriate to use in the manufacture of long cylinders.
Keywords: mandreling, thick-walled cylinders, residual stresses, plastic tension, accuracy of holes.
References
1. Skvortsov V.F., Arlyapov A.Yu., Okhotin I.S. Dornovanie glubokikh otverstii malogo diametra [Small diameter deep hole mandrelling]. SPRAVOCHNIK. Inzhenernyi zhurnal – HANDBOOK. An Engineering Journal, 2012, no. 2, appendix, pp. 1–24.
2. Okhotin I.S., Skvortsov V.F. Dornovanie glubokikh otverstii malogo diametra s bol'shimi natiagami [Mandrelling deep small holes with big tightness]. Germany, LAP LAMBERT Academic Publ., 2011. 170 p.
3. Skvortsov V.F., Okhotin I.S., Arlyapov A.Yu. Ostatochnye napriazheniia pri dornovanii otverstii malogo diametra s bol'shimi natiagami [Residual stresses at mandrelling small holes with big tightness]. Izvestiia Tomskogo politekhnicheskogo universiteta - Bulletin of the Tomsk Polytechnic University, 2010, Vol. 316, no. 2, pp. 24–27.
4. Monchenko V.P. Effektivnaia tekhnologiia proizvodstva polykh tsilindrov [Effective technology for the production of hollow cylinders]. Moscow, Mashinostroenie Publ., 1980. 248 p.
5. Proskuriakov Yu.G. Dornovanie otverstii [Mandrelling holes]. Sverdlovsk, Mashgiz Publ., 1961. 192 p.
6. Proskuriakov Yu.G., Isaev A.N., Popov L.V., Valiaev F.F. Ostatochnye napriazheniia i tochnost' detalei, obrabotannykh dornovaniem [Residual stresses and accuracy parts treated mandrelling]. Vestnik Mashinostroeniya - Russian Engineering Research, 1973, no. 7, pp. 57–60.
7. Proskuriakov Yu.G., Romanov V.N., Isaev A.N. Ob"emnoe dornovanie otverstii [Volume mandrelling holes]. Moscow, Mashinostroenie Publ., 1984. 224 p.
8. Rozenberg A.M., Rozenberg O.A. Mekhanika plasticheskogo deformirovaniia v protsessakh rezaniia i deformiruiushchego protiagivaniia [Mechanics of plastic deformation in the process of cutting and pulling the deforming]. Kiev, Naukova dumka Publ., 1990. 320 p.
9. Rozenberg A.M., Rozenberg O.A., Gritsenko E.I., Posviatenko E.K. Kachestvo poverkhnosti, obrabotannoi deformiruiushchim protiagivaniem [Quality of treated surface deforming pulling]. Kiev, Naukova dumka Publ., 1977. 187 p.
10. Tumanov A.T., Kvasov F.I., Fridliander I.N. Aliuminii [Aluminium]. Moscow, Metallurgiia Publ., 1972. 664 p.
11. Vishniakov Ya.D., Piskarev V.D. Upravlenie ostatochnymi napriazheniiami v metallakh i splavakh [Control residual stresses in metals and alloys]. Moscow, Metallurgiia Publ., 1989. 254 p.
12. Fridman Ya.B. Mekhanicheskie svoistva metallov. Deformatsiia i razrushenie [Mechanical properties of metals. The deformation and fracture]. Moscow, Mashinostroenie Publ., 1974. 472 p.
13. Babichev M.A. Metody opredeleniia vnutrennikh napriazhenii v detaliakh mashin [Methods for determination of internal stresses in machine parts]. Moscow, AS USSR Publ., 1955. 132 p.
14. Birger I.A. Ostatochnye napriazheniia [Residual Stresses]. Moscow, MAShGIZ Publ., 1963. 232 p.
15. Venttsel' E.S. Teoriia veroiatnostei [Probability Theory]. Moscow, Vysshaia shkola Publ., 1999. 576 p.
