Cylinder spinning rollers

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The cylinder pressure rollers (Zylinderabstreckwalzen, flow-forming, spinning tube, tube-turning) is a pressure forming of metal workpieces. It is used in massive forming right through to the manufacture of precision parts.

The reshaping of the workpiece takes place through its rotation, whereby freely rotatable rollers are also set in rotation by means of frictional engagement . These rollers are guided on two axes and are controlled by CNC . Due to the infeed of the rollers, a zone of plastic flow forms in the contact area with the workpiece. The rollers displace the material in the radial, axial and slightly also in the tangential direction. With a CNC-based control of the rollers, steps, transitions or radii can be mapped on the outside diameter in one operation. Special internal geometries, such as toothing using a mandrel, can also be produced.

In contrast to deep drawing , cylinder pressure rolling has lower forming forces due to the incremental forming of the workpieces. Due to the prevailing high hydrostatic stress condition, not only aluminum alloys and 20MnCr5 but also titanium alloys such as Ti6Al4V or nickel-based alloys can be formed. The flow-forming process is characterized by the flexible use of simple tool geometries. Components with final geometries with surface hardening or internal geometries can be produced.

Due to the incremental forming, the processing times are longer than with deep drawing. Most of the cost of the flow forming process is the machine cost; these are partially offset by low tool costs and short set-up times.

literature

  • K. Birk: Investigations into the use of ironing in the manufacture of rotationally symmetrical hollow bodies with internal teeth. Dissertation, Technical University of Karl-Marx-Stadt, 1985.
  • E. Thamasett: Forces and shape changes during ironing of cylindrical, rotationally symmetrical hollow bodies made of aluminum. Dissertation at the Technical University of Stuttgart, Max Planck Institute for Metal Research, 1961.
  • R. Ufer: Modeling and simulation of flow forming processes. Dissertation TU Chemnitz, Faculty of Mechanical Engineering, 2006.
  • M. Kuss, S. Wallner, O. Harrer, B. Buchmayr: FEM analysis of axial-radial forming as a process extension of radial forging. XXXI. Deformation Science Colloquium, 2012, pp. 29–33.