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G.F. Prokof'ev, O.L. Kovalenko Complete text of the article:Download article (pdf, 0.5MB )UDС621.935DOI:10.17238/issn0536-1036.2016.3.117AbstractThe failure of the saws due to the fatigue effect is the most common cause of the ineffective time of the band saws. The formation of cracks in the tooth space not only reduces the band saws performance, but also increases the cost of the acquisition and preparation of the saws and creates a danger for the workers. The tooth space parameters, which are the stress con-centrators, have a great influence on the fatigue strength of the band saws. To assess the strength of a band saw we should know the stress concentration factor in the tooth space of a band saw on its bend on the wheels and tension. Knowledge of these factors let us to deter-mine the equivalent stress concentration factor and to calculate the safety factor of a band saw. Previously, the authors identified the theoretical and actual stress concentration factors in the tooth space of a band saw under bending and the sensitivity coefficient of materials of a band saw. The paper presents the experiments to determine the theoretical stress concen-tration factor of a saw under tension. A band saw sample was fixed up in the universal test-ing machine head TIME WDW 200E. The tension of a band saw sample was performed by the vertical displacement of the upper head. 5 resistive strain gages were fixed in the middle of the free length of the sample: one was near the tooth space; others were distributed at the equal distances along the blade width of the sample. The stresses were characterized by a voltage value in millivolts measured by the voltmeter. The theoretical stress concentration factor of a band saw under tension equal to 1.62 is obtained. The actual stress concentration factor in the tooth space of a band saw under tension is 1.53 at the sensitivity coefficient of materials (steel 9ХФ – alloy structure steel) of a band saw, equal to 0.85.AuthorsG.F. Prokof'ev, Doctor of Engineering Sciences, Professor O.L. Kovalenko, Postgraduate StudentAffiliationNorthern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation;e-mail: g.prokofjev@narfu.ru, o.kovalenko@narfu.ru Keywordsband saw, fatigue crack, stress concentration factor in the tooth space, sensitivity coefficient of materials of a band saw, safety factor of a band saw.References1. Dobrynin E.D. Issledovanie prichin avariynogo raskhoda lentochnykh pil [Re-search into the Causes of the Average Disbursement of the Band Saws]. Mekhanicheskaya tekhnologiya drevesiny [Mechanical Wood Technology]. Saint Petersburg, 1976, pp. 45–46. 2. Malyshev Yu.V. Vliyanie nekotorykh faktorov na dolgovechnost' poloten len-tochnykh delitel'nykh pil [Influence of Some Factors on the Durability of the Band Resaw Blades]. Saint Petersburg, 1974. 10 p. 3. Nastenko A.A., Veselkov V.I. Tekhnologicheskie rezhimy RI 04–00. Podgotovka delitel'nykh lentochnykh pil [Technological Modes of RI 04–00. Preparation of the Band Resaws]. Arkhangelsk, 1976. 66 p. 4. Prokof'ev G.F. Opredelenie trebuemoy prochnosti pil mnogopil'nykh len-tochnopil'nykh stankov [Determination of the Required Strength of the Multiblade Band Resaws]. Lesnoy zhurnal, 1989, no. 6, pp. 81–85. 5. 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. 6. Prokof'ev G.F., Kovalenko O.L. Opredelenie koeffitsienta kontsentratsii naprya-zheniy v mezhzubovykh vpadinakh lentochnykh pil pri izgibe [Determination of the Stress Concentration Factor in the Tooth Space of the Band Saws under Bending]. Lesnoy zhurnal, 2015, no. 4, pp. 50–56. 7. Feoktistov A.E. Prichiny poyavleniya treshchin v polotnakh lentochnykh pil [Causes of Cracks in the Band Saw Blades]. Derevoobrabatyvayushchaya promyshlennost' [Woodworking Industry], 1960, no. 5, pp. 12–14. 8. Feoktistov A.E. Lentochnopil'nye stanki [Band Saws]. Moscow, 1976. 152 p. 9. Shvamm L.G. Issledovanie i razrabotka metodov povysheniya dolgovechnosti len-tochnykh pil dlya raspilovki drevesiny: avtoref. dis. ... kand. tekhn. nauk [Research and De-velopment of the Improving Practices of Band Saw Durability for Re-sawing: Cand. Eng. Sci. Diss. Abs.]. Leningrad, 1982. 20 p. Received on September 18, 2015 Determination of the Stress Concentration Factor in the Tooth Spaceof a Band Saw under Tension |
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