Studies for the Development of a Simulation Basis for Numerically Controlled Driving of Sheet Metal

2005 ◽  
Vol 6-8 ◽  
pp. 517-524 ◽  
Author(s):  
Hartmut Hoffmann ◽  
R. Hautmann ◽  
R. Petry
Keyword(s):  
Production Process ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Sheet Steel ◽  
Ancient World ◽  
Work Piece ◽  
Forming Process ◽  
Production Processes ◽  
Steel Angles

The manufacturing technique of driving is one of the oldest procedures for sheet metal forming and has been used in the ancient world for the production of copper pots and vases. This technique is still utilized for niche applications but today has lost its importance. The process of driving is almost completely carried out manually and thus is only appropriate for very small quantities or in case of failure of other production processes. Since individualization of products is strongly gaining in significance, forming processes have to be found, which are independent from expensive tools and equipment. Using driving as the process of choice to form sheet metal, the grade of automation of the forming process has to be increased. Numerically controlled driving, i.e. automated positioning and handling of the work piece during the production process, will need a conclusive simulation base. This paper provides results of the analysis of sheet steel angles formed by the driving sub groups of shrinking and stretching.

A Study of the Strain Distributions and Strain Histories in Axisymmetrical Stretch-Forming

1974 ◽  
Vol 96 (4) ◽  
pp. 1277-1284
Author(s):  
T. C. Hsu ◽  
P. K. Lee
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Sheet Steel ◽  
Forming Process ◽  
Pressure Plate ◽  
Metal Forming Process ◽  
Strain Paths ◽  
Metal Products ◽  
Blank Diameter

The strain distributions and strain histories in the axisymmetrical sheet metal forming process have hitherto been difficult to study owing to the lack of a succinct system of representation. The use of a triangular coordinate system to represent the strains in axisymmetrical sheet metal products is explained. Strain distributions and strain paths in sheet steel products are presented for processes involving variations in blank diameter, load on the pressure plate and punch profile radius. It is shown, by studying the growth of draw-in, that the effect of an increase in blank diameter is the same as that of increasing the load on the pressure plate. The various effects of a change in the punch profile radius are also discussed through the diagrams showing the strain distributions and strain paths.

Evaluation of Different Influencing Factors in Dry Sheet Metal Forming with Vaporizing CO2 Used as Lubricant

2015 ◽  
Vol 794 ◽  
pp. 53-58 ◽  
Author(s):  
Markus Singer ◽  
Mathias Liewald
Keyword(s):  
Sheet Metal ◽  
Process Parameters ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Mineral Oil ◽  
Work Piece ◽  
Forming Process ◽  
Ecological Requirements ◽  
Further Development

Lubricants in sheet metal forming have to meet increasing demands resulting from political aims and ecological requirements. For that reason, industry aspires the reduction of lubrication with the long term goal of replacing conventional mineral oil based lubricants entirely. Dry metal forming to a certain limit can be achieved by using liquid CO2 during the forming process. This lubricant vaporizes after deep drawing process and leaves a clean work piece that can be used in coating or joining processes without any subsequent cleaning. In this contribution, further development and resulting effects of numerous process parameters are evaluated and presented. Investigations of restraining forces in strip draw tests when lubricated with liquid CO2 include different tool parameters like drilling diameters (120 and 140 µm), different numbers of drillings (25 and 49) as well as different process parameters like surface pressure (2,5 and 6,5 MPa) or drawing speed (50 and 100 mm/s). Amount of restraining forces in this paper also are compared to two different conventional mineral oil based lubricants (Wisura AK 3080 and Wisura ZO 3368). The results presented in this contribution may provide a better understanding of tribological mechanisms emerging within this new lubrication system.

scholarly journals Laser Welding of High-strength Aluminium Alloys for the Sheet Metal Forming Process

Procedia CIRP ◽  
2014 ◽  
Vol 18 ◽  
pp. 203-208 ◽  
Author(s):  
J. Enz ◽  
S. Riekehr ◽  
V. Ventzke ◽  
N. Sotirov ◽  
N. Kashaev
Keyword(s):  
Laser Welding ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Aluminium Alloys ◽  
High Strength ◽  
Forming Process ◽  
Metal Forming Process

scholarly journals Methods of determination of frictional resistances in sheet metal forming of car body sheets

2018 ◽  
Vol 19 (6) ◽  
pp. 756-760
Author(s):  
Tomasz Trzepieciński ◽  
Irena Nowotyńska
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Complex Function ◽  
Forming Process ◽  
The Coefficient Of Friction ◽  
Displacement Speed ◽  
Almost All ◽  
Lubrication Conditions

The friction phenomenon existed in almost all plastic working processes, in particular sheet metal forming, is a complex function of the material's properties, parameters of the forming process, surface topography of the sheet and tools, and lubrication conditions. During the stamping of the drawpieces there are zones differentiated in terms of stress and strain state, displacement speed and friction conditions. This article describes the methods for determining the value of the coefficient of friction in selected areas of sheet metal and presents the drawbacks and limitations of these methods.

Surrogate POD Models for Parametrized Sheet Metal Forming Applications

2013 ◽  
Vol 554-557 ◽  
pp. 919-927 ◽  
Author(s):  
Hamdaoui Mohamed ◽  
Guénhaël Le Quilliec ◽  
Piotr Breitkopf ◽  
Pierre Villon
Keyword(s):  
Finite Element ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Optimization Problems ◽  
Strain Tensor ◽  
Forming Limit ◽  
Work Piece ◽  
Displacement Fields ◽  
Lagrange Strain

The aim of this work is to present a POD (Proper Orthogonal Decomposition) based surrogate approach for sheet metal forming parametrized applications. The final displacement field for the stamped work-piece computed using a finite element approach is approximated using the method of snapshots for POD mode determination and kriging for POD coefficients interpolation. An error analysis, performed using a validation set, shows that the accuracy of the surrogate POD model is excellent for the representation of finite element displacement fields. A possible use of the surrogate to assess the quality of the stamped sheet is considered. The Green-Lagrange strain tensor is derived and forming limit diagrams are computed on the fly for any point of the design space. Furthermore, the minimization of a cost function based on the surrogate POD model is performed showing its potential for solving optimization problems.

Investigating Bauschinger Effect and Plastic Hardening Characteristics of Sheet Metal under Cyclic Loading

2017 ◽  
Vol 4 (2) ◽  
pp. 1-14 ◽  
Author(s):  
Jasri Mohamad
Keyword(s):  
Cyclic Loading ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Bauschinger Effect ◽  
Low Carbon Steel ◽  
Cyclic Hardening ◽  
Low Carbon ◽  
Forming Process ◽  
Metal Forming Process

To improve sheet metal forming process simulation using finite element method, there is a need to incorporate an appropriate constitutive equation capable of describing the Bauschinger effect and the so-called cyclic transient, derived from a near to actual sheet metal forming process testing tool. A cyclic loading tool has been developed to test and record the characteristics of sheet metal deformation by investigating the Bauschinger effect factors (BEF) and cyclic hardening behaviour. Experimental investigation conducted on low carbon steel and stainless steel demonstrates that the tool is able to record sheet metal behaviour under cyclic loading. The results are analysed for signs of the Bauschinger effect and cyclic hardening effect. It was found that the Bauschinger effect does occur during bending and unbending loadings in sheet metal forming process.

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