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Test of Bulging Stress Concentration Factors in the Band Saw Notches

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G.F. Prokof'ev, O.L. Kovalenko, S.A. Cherepanov

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UDС

621.935

DOI:

10.17238/issn0536-1036.2015.4.125

Abstract

The article gives the description of the tests of bulging stress concentration factors in the band saw notches. Animation and static tests were carried out at the pilot plant. As a result the sensibility factor of the saw material is identified. After the tests defining the concentration saw tensile stress factors the equivalent stress concentration coefficient for band saw stress calculation can be determined. The endurance limit of the material patterns of the band saws with the sawteeth and without the sawteeth at the zero-to-tension stress cycle is also defined. It will allow constructing a limiting amplitude scheme. Thus, it will be possible to define the limit stress values for any asymmetric depth cycles of band saws. Abroad the wood-milling band saws are made from hard-rolled tampered steel, as well as domestic saws of steel 9ХФ. The tapping specification of foreign saws is similar to domestic saws, though they are alloyed by additional elements to improve their operational properties. High-impact alloyed steels are also highly sensitive to the stress concentration. Therefore, the conclusions made in the article are also valid in relation to the foreign band saws. According to the results of the experimental studies we have drawn the following conclusions:

  1. The results of performed tests confirm that the destruction of band saws is of fatigue nature.
  2. The theoretical and actual coefficients of stress concentration at symmetric bending in the notches of the band saws 3405-0032 GOST 6532-77 steel 9ХФ are respectively: ακ = 1.27, κэф = 1,23. The sensibility factor of the band saws material for the same conditions is also determined: q = 0.85.
  3. To increase the band saws life the following meaningful and technological measures are necessary:
    – to edit a notch profile;
    – to slow the process of the fatigue cracks development, for example, by the thermo-softening method [10].
  4. After the research of the stress concentration factors of the tensile saw the equivalent stress concentration coefficient should be defined. This coefficient can be used at the band saws stress calculation.

Authors

  • G.F. Prokof'ev, Doctor of Engineering, Professor
  • O.L. Kovalenko, Postgraduate Student
  • S.A. Cherepanov, Postgraduate Student

    Northern (Arctic) Federal University named after M.V. Lomonosov,
    Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russia;
    е-mail:
    g.prokofjev@narfu.ru,
    е-mail: o.kovalenko@narfu.ru

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russia

Keywords

stress concentration factor, band saw, endurance limit, endurance strength, sensitivity

References

  1. GOST 25.502-79. Metody mekhanicheskikh ispytaniy metallov. Metody ispytaniy na ustalost' [State Standart 25.502-79. Methods of Mechanical Tests of Metals. Methods of Fatigue Tests]. Moscow, 1980.
  2. Dobrynin E.D. Kontsentratsiya napryazheniy v polotnakh lentochnykh pil ot nasechki zub'ev [Dependence of Stress Concentration in the Band Saw Blades on Notches Sawteeth]. Derevoobrabatyvayushchaya promyshlennost', 1962, no. 4, pp. 10-11.
  3. Kovalenko O.L. Eksperimental'naya ustanovka dlya issledovaniya ustalostnoy prochnosti lentochnykh pil [Pilot Plant for the Research of Band Saws Endurance Strength]. Nauka - severnomu regionu; Sb. nauch. tr. [Proc. Science to the Northern Region]. Arkhangelsk, 2002, pp. 110-112.
  4. Kogaev V.P. Prochnost' i iznosostoykost' detaley mashin: ucheb. posobie dlya mashinostr. spets. vuzov [Strength and Endurance of Machine Elements]. Ed. by V.P. Kogaev, Yu.N. Drozdov. Moscow, 1991. 319 p.
  5. Loginov V.N. Elektricheskie izmereniya mekhanicheskikh velichin [Electric Measurements of Mechanical Quantities]. Moscow, 1970. 80 p.
  6. Malyshev Yu.V. Vliyanie nekotorykh faktorov na dolgovechnost' poloten lentochnykh delitel'nykh pil [Influence of Some Factors on the Band Saw and Resawing Machine Blades Life]. Leningrad, 1974. 10 p.
  7. Prokof'ev G.F., Ivankin I.I., Kovalenko O.L. Sposob tormozheniya rasprostraneniya treshchiny v lentochnoy pile [The Way to Slow Down the Crack Extension in a Band Saw]. Patent RF, no. 2395388, 2009.
  8. Prokof'ev G.F. Opredelenie trebuemoy prochnosti pil mnogopil'nykh lentochnopil'nykh stankov [Required Strength Definition of Saws of Multifunctional Band Sawing Machines]. Lesnoy zhurnal, 1989, no. 6, pp. 81-85.
  9. Prokof'ev G.F. Intensifikatsiya pileniya drevesiny ramnymi i lentochnymi pilami [Intensification of Wood Sawing by Frame Saws and Band Saws]. Moscow, 1990. 240 p.
  10. Shvamm L.G. Issledovanie i razrabotka metodov povysheniya dolgovechnosti lentochnykh pil dlya raspilovki drevesiny: avtoref. dis… kand. tehn. nauk. [Research and Development of Enhancing Methods of Band Saws Life for Wood Sawing: Cand. Tech. Sci. Diss. Abs.]. Leningrad, 1982. 20 p.


Test of Bulging Stress Concentration Factors in the Band Saw Notches

 

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