Determining the width of the workpiece under bending conditions with stretching of the stamped part

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Abstract


Aims of research. This paper deals with the problem of determining the radius of the neutral surface of the bending strip at the same time the action of tensile stresses. Methods. In the development of technological processes of sheet bending and the calculation of the initial billet (sweep), most often considered a flat stress state and preference is given to the theory of pure bending, providing uniform curvature of the individual layers of metal under the action of the bending moment and neglecting the action of transverse tensile forces. However, in reality, bending is always accompanied by sliding of the metal along the deforming tool, causing the appearance of friction forces and creating a complex loading in the form of plastic bending with stretching in the metal, which will additionally displace the neutral surface, forcing the experienced one to adjust the technology of manufacturing bent parts. Provides an overview and analysis of the most famous works dedicated to the topic, specifying the distribution of the contact stresses from the inner surface to the center of curvature and developed the theory of complex bending, which allows to specify the radius of the neutral surface in conditions of stretching of the flexible strip of the additional tangential stresses. Results. The results obtained will allow to simulate the stress state of the metal in the development of technological processes of sheet stamping and, in particular, to assess the specific braking force during the bending (straightening) of the strip in the process of pulling through the thresholds and brake edges of the die tooling to eliminate possible defects in the elongated parts and to clarify the dimensions of the workpiece and the finished profile.


About the authors

Yury A Morozov

MIREA - Russian Technological University

Author for correspondence.
Email: akafest@mail.ru
SPIN-code: 3189-5426
20 Stromynka St., Moscow, 107996, Russian Federation

PhD in Technical Sciences, Associate Professor, Department of Information Technologies in Machineand Instrument Engineering, MIREA - Russian Technological University (RTU MIREA). Research interests: research and development with mathematical support of effective processes of metalworking with pressure

Evgeniy Yu Verkhov

Moscow Polytechnic University

Email: uv.evg.yourich@mail.ru
SPIN-code: 1244-5518
38 Bolshaya Semenovskaya St., Moscow, 111250, Russian Federation

PhD in Technical Sciences, Associate Professor, Department of Pressure Processing and Additive Technologies, Moscow Polytechnic University. Research interests: metal forming, shaping of parts by sheet stamping

References

  1. Shinkin V.N. (2016). Raschet sil i momentov semirolikovoj pravil'noj mashiny pri predvaritel'noj pravke stal'nogo lista [Calculation of steel sheet’s curvature under preliminary flattening on the seven roller straightening machine]. Izvestiya vuzov. Chernaya metallurgiya [Proceedings of higher educational institutions. Ferrous metallurgy], 59(12), 870-874. (In Russ.)
  2. Shinkin V.N. (2016). Metodika rascheta geometrii stal'nogo lista pri predvaritel'noj pravke na semirolikovoj pravil'noj mashine [Calculation method of steel sheet’s geometry under preliminary flattening on seven-roller straightening machine]. Izvestiya vuzov. Chernaya metallurgiya Proceedings of higher educational institutions. Ferrous metallurgy], 59(11), 793-798. (In Russ.)
  3. Wiebenga J.H., Atzema E.H., An Y.G., Vegter H., van den Boogaard A.H. (2014). Effect of material scatter on the plastic behavior and stretchability in sheet metal forming. Journal of Materials Processing Technology, 214(2), 238-252.
  4. Parsa M.H., Nasher Al Ahkami S., Pishbin H., Kazemi M. (2012). Investigating spring back phenomena in double curved sheet metals forming. Materials & Design, (41), 326-337.
  5. Ilyin L.N., Semenov E.I. (2009). Tekhnologiya listovoj shtampovki [Technology of sheet metal forming]. Moscow: Drofa Publ., 475. (In Russ.)
  6. Verkhov E.Yu., Morozov Yu.А. (2011). Analysis and development of manufacturing technology for plate bent parts. Bulletin of the Moscow State Open University. Series: Technique and Technology, 4(6), 14-19. (In Russ.)
  7. Verkhov E.Yu., Morozov Yu.А., Frolov А.А. (2015). Clamp drawing die for high-quality produce complex sheet metal parts. Structural Mechanics of Engineering Constructions and Buildings, (2), 11-17. (In Russ.)
  8. Morozov Yu.А., Verkhov E.Yu., Krutina E.V. (2016). Receiving qualitative products at the sheet extract with the clip. Zagotovitel'nye proizvodstva v mashinostroenii, (1), 19-24. (In Russ.)
  9. Pathak N., Butcher C., Worswick M. (2016). Assessment of the Critical Parameters Influencing the Edge Stretchability of Advanced High-Strength Steel Sheet. Journal of Materials Engineering and Performance, 25(11), 4919-4932.
  10. Ishimaru E., Takahashi A., Ono N. (2010). Effect of material properties and forming conditions on formability of high-purity ferritic stainless steel. Nippon Steel Technical Report, (99), 26-32.
  11. Tselikov А.I., Tomlenov А.D., Zyuzin V.I. et al. (1982). Teoriya prokatki: spravochnik [Theory rolling: reference guide]. Moscow: Metallurgiya Publ., 335. (In Russ.)

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Copyright (c) 2019 Morozov Y.A., Verkhov E.Y.

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