Shaping technologies for manufacturing noise insulation casings of turbojet engines

Abstract

The article discusses questions of shaping honeycomb panels for turbojet engine noise insulation casings. Various types of structures and materials used for manufacturing honeycomb panels are presented. Samples were tested to determine mechanical characteristics. The technology of manufacturing honeycomb panels was determined by the value of relative elongation. The main rejection criteria in forming panels on bending and stretching presses were reviewed. The process of shaping honeycomb panels using computer numerical control (CNC) equipment was analyzed. Force parameters of the shaping process required for the assessment of the stress-strain state and obtaining the control program were determined. The values of the spring action were calculated for single-layer and double-layer panels using the A.A. Ilyushin unloading theorem. It was found that the springing of single-layer and two-layer panels differs due to the magnitude of the generalized rigidity. The value of springing is determined by the known height of the honeycomb panel. Designs of honeycomb panels with different positions of the middle layer along the height of the panel are given. Graphs showing the dependence of the punch radius adjusted for the value of springing on the radius of the part for various types of structures from titanium alloys and stainless steels are presented.

About the authors

M. V. Molod

Voronezh State Technical University

Author for correspondence.
Email: molodmv@yandex.ru

Doctor of Science (Engineering)
Associate Professor

Russian Federation

V. I. Maksimenkov

Voronezh State Technical University

Email: maksimenkov.v.i@mail.ru

Doctor of Science (Engineering), Professor

Russian Federation

V. I. Fedoseev

Public Company “Irkut” Corporation”

Email: vladislav.f@inbox.ru

Design Engineer

Russian Federation

References

  1. Oding S.S., Molod М.V. Povyshenie tekhnologicheskikh vozmozhnostey protsessa obtyazhki na pressakh s ChPU. Mezhvuzovskiy sbornik nauchnykh trudov «Progressivnye tekhnologii aviatsionnogo i mashinostroitel'nogo proizvodstva. Aerodinamika, mekhanika i tekhnologiya aviastroeniya». Voronezh: Voronezh State Technical University Publ., 2000. P. 18-22. (In Russ.)
  2. Oding S.S. Controlling the formation of double curvature skin elements on a program-controlled stretch former. I. Soviet Aeronautics. 1987. V. 30, Iss. 3. P. 57-61.
  3. Miheev V.A., Grechnkov F.V., Dementyev S.G., Samohvalov V.P., Savin D.V., Surudin S.V. Simulation of kinematics scheme serial of shells stretchforming double-convex form on stretchforming press FEKD. Izvestiya Samarskogo Nauchnogo Tsentra RAN. 2014. V. 16, no. 6. P. 172-179. (In Russ.)
  4. Golenkov V.A., Dmitriev A.M., Kukhar' V.D., Radchenko S.Yu. Spetsial'nye tekhnologicheskie protsessy i oborudovanie obrabotki davleniem [Special technological processes and equipment of plastic working]. Moscow: Mashinostroenie Publ., 2004. 464 p.
  5. Maksimenkov V.I., Molod М.V., Ljakhova N.E., Reshetnikova E.V. Sposob obtyazhki listovykh materialov [Method of sheet-stretching]. Patent RF, no. 2459680, 2012. (Publ. 27.08.2012, bull. no. 24).
  6. Molod М.V. Development of a universal punch. Bulletin of Voronezh State Technical University. 2016. V. 12, no. 1. Р. 55-57. (In Russ.)

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