Straightening Presses

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Straightening Presses

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Index

  1. Dimensionally accurate pieces from a straightening press
  2. The straightening press is the child of precision manufacturing
  3. The application of straightening presses in production
  4. Manufacturers and brand names of straightening presses
Used straightening press front view

Dimensionally accurate pieces from a straightening press

A straightening press is applied in processes, where undesired shapes and forms need to be corrected. It undertakes this task through machining or thermo processing of metal workpieces. It can also be used for reparations, in order to eliminate deformations on workpieces that have resulted from bending. The straightening press generates a certain level of stress onto the workpiece, causing the workpiece to reform along its elastic areas.
  • Correcting undesired forms
  • Pre-processing with low tolerances
  • Used to straighten gearbox and crank shafts
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During the straightening process, the generated reforming is controlled by measurement equipment located on the straightening press. Using straightening presses is a type of discontinuous straightening process.

The straightening press is the child of precision manufacturing

An associated press in the form of a hammer (in other words, a stone used as a hammer), was the first type of tool that humans used. Presses used as machines in metalworking were first introduced at the end of the 19th century in the bicycle industry in the American Midwest. At the beginning of the 20th century Henry Ford started incorporating presses into his manufacturing process for automobile construction. The demand for a special straightening press first came about in the mid 19th century alongside the demand for more precise finished metal workpieces.
Used straightening press unit
However, straightening presses were only first effectively used after the development of specific measuring methods. The invention of the hydraulic press by Joseph Bramah in 1975 was of particular significance for the development of the straightening press. It allowed for controlled application of force regardless of the type of work. Most straightening presses are therefore built as stroke-controlled hydraulic presses.

The application of straightening presses in production

Generally, machining production processes and thermo processes like hardening are used to change undesired forms of a workpiece. A demand for low production tolerances requires precise machining. This can be done in a variety of ways, like grinding. As a forming process that doesn't result in chippings, straightening saves material and allows a pre-processing of the workpiece with low tolerances. Stroke controlled straightening machines allow for workpieces to be straightened with accuracy of up to a thousandth of a millimetre. These machines can be used, for example, during the processing of hardened guide rails, during the final grinding stages and are used for the straightening of gearbox and crank shafts.

Manufacturers and brand names of straightening presses

New and used straightening presses are found under the following brand names: DUNKES, EIBEL, EITEL, GALDABINI, GILETTE, HIDROGARNE, HURTH, HYMAG, JENNY, KORNMANN, MAE, MUELLER, NEFF, PAGNONI, PELLISIER, SAUER, SOMO, STANKO, W-S-W, and WMW.

Used straightening press overall view
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