Analytical model for determining allowances for elastomer constrained bending of aircraft parts

Abstract

In the article, the authors present a method of constrained bending of aircraft sheet parts with curved sides by an elastic medium. The process of conducting constrained bending is described. A schematic description of the process is presented. The manufacture of a part is carried out in two steps. As a result of the first step, a piece is obtained with thinning in the radius part, the second step is accomplished with a unit die of reduced height. The resulting wave of excess material is deformed along the radius of the bending mandrel. In the finished part, an increase in the thickness of the workpiece is observed in the zone of the bending radius. The wave of excess material is formed due to a special allowance, the size of which is the critical factor for achieving this increase in thickness. The analytical model for determining the allowance is based on generally accepted assumptions and principles for calculating process parameters. To determine the allowance, an approximation of the shape of the excess wave by a tangential function is proposed. This allows you to get an analytical dependence that relates the geometry of the part and the thickening of the wall to the size of the allowance. The size of the allowance is limited to a certain range, the lower boundary of which is determined by the onset of plastic deformations, the upper one - by the possibility of loss of stability, leading to irreparable spoilage. The results are illustrated by graphs of the dependence of the minimum and maximum allowance for the side height on the ratios of the workpiece wall thickness, the radius of the side bending and the radius of the side in plan. Characteristic curves and analytical dependencies are presented in a dimensionless form, where the geometric parameters are assigned to the radius of the bending tool, that is, to the radius of bending of the part side on the inner surface.

About the authors

V. K. Moiseev

Samara National Research University

Author for correspondence.
Email: moiseevvk@mail.ru

Doctor of Science (Engineering), Professor; Department of Aircraft Production and Quality Control in Mechanical Engineering

Russian Federation

E. G. Gromova

Samara National Research University

Email: pla.gromova@ya.ru

Candidate of Science (Engineering), Associate Professor; Department of Aircraft Production and Quality Control in Mechanical Engineering

Russian Federation

O. V. Lomovskoi

Samara National Research University

Email: oleg.lomovskoi@ya.ru

Candidate of Science (Engineering), Associate Professor; Department of Aircraft Production and Quality Control in Mechanical Engineering

Russian Federation

M. N. Mantusov

Ulyanovsk branch of Tupolev Design Bureau

Email: mishaufkb@ya.ru

Leading Engineer

Russian Federation

A. N. Plotnikov

Samara National Research University

Email: anplotnikov@ya.ru

Candidate of Science (Engineering), Associate Professor; Department of Aircraft Production and Quality Control in Mechanical Engineering

Russian Federation

A. A. Sharov

Samara National Research University

Email: aa.sharov@ya.ru

Candidate of Science (Engineering), Associate Professor; Department of Aircraft Production and Quality Control in Mechanical Engineering

Russian Federation

References

  1. Mosieev V.K., Mantusov М.N., Plotnikov A.N., Lomovskoi O.V., Sharov A.A. Improving the technology of bending curved sides of aircraft parts. Izvestiya Samarskogo Nauchnogo Tsentra RAN. 2018. V. 20, no. 4 (3). P. 441-444. (In Russ.)
  2. Mantusov M.N., Moiseev V.K., Sharov A.A., Gromova E.G., Ryzhakov S.G. Stamping of sheet details with curvilinear sides by elastic material. Izvestiya Samarskogo Nauchnogo Tsentra RAN. 2018. V. 20, no. 4 (3). P. 332-336. (In Russ.)
  3. Grechnikov F.V., Moiseev V.K., Lomovskoy O.V., Sharov A.A., Mantusov M.N. Stamping with tangential compression of high-precision sheet metal parts. Forging and Stamping Production. Material Working by Pressure. 2019. No. 7. P. 3-9. (In Russ.)
  4. Moiseyev V.K., Sharov A.A., Gromova E.G., Mantusov M.N. Results of the sheet parts curved edges constrained bending with elastomer. Key Engineering Materials. 2017. V. 746. P. 285-289. doi: 10.4028/ href='www.scientific.net/kem.746.285' target='_blank'>www.scientific.net/kem.746.285

Statistics

Views

Abstract: 208

PDF (Russian): 83

Dimensions

PlumX

Refbacks

  • There are currently no refbacks.

Copyright (c) 2020 VESTNIK of Samara University. Aerospace and Mechanical Engineering

Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies