Rolling rounds

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Round rolling of a cylinder

The rounding rollers (DIN 8586 roller laps ) is a manufacturing process from the group of roll bending turn to turn one. In roll rounding, the blank is usually moved between three rollers (sometimes two or more than three) in order to bend it.

A simple example: a rectangular sheet is rolled round, a cylinder is created , the seam edges of which are then welded .

The sheet metal bending machines are used in three different designs:

  • 2-roll round bending machines: A urethane roll serves as the bottom roll and the sheet metal is bent by pressing the bottom roll against the top roll. This process is possible up to sheet metal thicknesses of 5 mm for cylindrical bodies, but is not widely used on the market.
  • 3-roller round bending machines: three rollers, at least the top roller of which is motor-driven, are rotatably mounted in a rigid machine frame. They are hydraulically or mechanically adjustable so that a forming force can be applied to the sheet to be bent. There are designs of the machines that only move the top roller, but also designs that can move the two side rollers left and right. Of the three presented, this type of bending machine is the most suitable for bending cones.
  • 4-roller round bending machines: four rollers, two of which (upper and lower roller) have the task of clamping and guiding the sheet to be bent and the two side rollers are adjustable so that they can enable the necessary bending force with the infeed. This type of machine is well suited for bending cylinders, even with large sheet metal.

The characteristics of round rollers are the working widths and the formable sheet thickness.

Normal data are 3 or 4 m working width and the ability to round 10 to 15 mm thick sheets.

There is an extremely large machine (now unused?) In Lille in France : a round roll with a working width of 6 m and the power to warmly roll up to 150 mm thick sheet metal slabs in the cold state, or red-hot sheets (from neighboring annealing furnaces) 250 mm thick to be able to.

The main application is container construction. Steel towers for wind turbines are also manufactured using this manufacturing process. Sheets up to 80 mm thick are rolled there. The steel towers often have a slightly conical shape.

literature

  • Herbert Sauerborn: Processing and penetration of sheet metal and solid parts. Springer Verlag Berlin Heidelberg GmbH, Berlin Heidelberg 1969.
  • Heinz Tschätsch, Jochen Dietrich: Practice of forming technology. Working process machines tools. 10th edition, Vieweg + Teubner, Wiesbaden 2010, ISBN 978-3-8348-1013-7 .
  • Ludwig Schaller: Pocket book for shipbuilders, boat builders, shipbuilders and sailmakers. Unikum Verlag, Bremen 2011, reprint of the original.

Web links

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