An inverse approach for the geometry prediction of sheet-metal parts with embossings made of high- and ultra-high strength steels

Nowadays feasibility studies using finite element analysis are performed in very early design phases of sheet metal parts forming. Further, simulation technology is used to optimize the first forming stage. Because of the ever intensifying international competition and the increased use of high-strength steels and aluminum alloys, the absorption of springback deviations is a great challenge, especially in the automotive industry. The application of numerical computation to predict springback deviations and to create compensated die designs in early design phases of sheet metal parts forming becomes essential. At DaimlerChrysler the numerically based compensation of springback deviations during the die development process of complex car parts is achieved. However, developments to optimize and compensate dies automatically or to predict form deviations on assemblies are still necessary.

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Energy Efficient Servo Controlled Roll Levelling Machines

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.716.413 ◽

2016 ◽

Vol 716 ◽

pp. 413-419

Author(s):

Eneko Sáenz de Argandoña ◽

Elena Silvestre ◽

Daniel Garcia ◽

Joseba Mendiguren ◽

Lander Galdos

Keyword(s):

Energy Consumption ◽

Residual Stresses ◽

Sheet Metal ◽

Energy Efficient ◽

High Strength Steels ◽

High Strength ◽

Important Process ◽

Process Improvements ◽

Wide Range ◽

Ultra High Strength Steels

The roll levelling and coil straightening facilities are becoming one of the most important process steps when forming Ultra High Strength Steels. The correct levelling and straightening of these materials are the main responsible for the stabilization of the residual stresses through the thickness and post forming springback of sheet metal formed components.Due to the arrangement of the rolls in roll levellers, micro-sliding occurs between the rolls and the sheet and the first rolls are subjected to high torques and high forces since they are responsible for the plastification of the material to a high extent. In order to reduce these drawbacks and optimize the energy consumption avoiding energy loses due to friction, the use of servo technology in levelling processes is studied in this paper.A wide range of materials are levelled using the conventional and the new servo controlled strategy that uses two servo motors and the process improvements are quantified.

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High Performance Active Elements for Agricultural Machines Made of Ultra High-Strength Steels

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.473.229 ◽

2011 ◽

Vol 473 ◽

pp. 229-234

Author(s):

W. Homberg ◽

Tim Rostek

Keyword(s):

Sheet Metal ◽

High Performance ◽

Thin Sheet ◽

High Strength Steels ◽

High Strength ◽

Thick Sheet ◽

Active Elements ◽

Thick Sheet Metal ◽

Thin Sheet Metal ◽

Ultra High Strength Steels

This article will highlight various aspects of the production process of high performance active elements made of ultra high-strength steels. Focus is put on the processing of thick sheet metal regarding hot forming by means of punching, embossing, and forging processes as well as on thermo-mechanical treatment. Due to the material thickness of the semi-finished parts/blanks used and owing to the high strength of the materials (Rm > 2600 MPa) current production techniques and parameters from the field of thin sheet metal can only be limitedly be transferred and have therefore been specially investigated for this application.

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