Revolutionizing car body manufacturing using a unified steel metallurgy concept

The consideration of existing methods for a modal analysis has shown a possibility for the lowest frequency definition of bending vibrations in a coach car body in a vertical plane based on an indirect method reduced to the assessment of the bending stiffness of the one-dimensional model as a Bernoulli-Euler beam with fragment-constant parameters. The assessment mentioned can be obtained by means of the comparison of model deflections (rated) and a prototype (measured experimentally upon a natural body) with the use of the least-squares method that results in the necessity of the solution of the multi-dimensional problem with the reverse coefficient. The introduction of the hypothesis on ratability of real bending stiffness of the prototype and easily calculated geometrical stiffness of a model reduces a multi-dimensional problem incorrect according to Adamar to the simplest search of the extremum of one variable function. The procedure offered for the indirect assessment of bending stiffness was checked through the solution of model problems. The values obtained are offered to use for the assessment of the lowest frequency of bending vibrations with the aid of Ritz and Grammel methods. In case of rigid poles it results in formulae for frequencies into which there are included directly the experimental values of deflections.

Download Full-text

Technogenic magnetic particles from steel metallurgy and iron mining in topsoil: Indicative characteristic by magnetic parameters and Mössbauer spectra

The Science of The Total Environment ◽

10.1016/j.scitotenv.2021.145605 ◽

2021 ◽

Vol 775 ◽

pp. 145605

Author(s):

Tadeusz Magiera ◽

Beata Górka-Kostrubiec ◽

Tadeusz Szumiata ◽

Małgorzata Wawer

Keyword(s):

Magnetic Particles ◽

Mössbauer Spectra ◽

Magnetic Parameters ◽

Mossbauer Spectra ◽

Steel Metallurgy ◽

Iron Mining ◽

Technogenic Magnetic Particles

Download Full-text

Overview of Forming and Formability Issues for High Volume Aluminium Car Body Panels

Materials Science Forum ◽

10.4028/www.scientific.net/msf.519-521.795 ◽

2006 ◽

Vol 519-521 ◽

pp. 795-802 ◽

Cited By ~ 7

Author(s):

Dominique Daniel ◽

Gilles Guiglionda ◽

Pierre Litalien ◽

Ravi Shahani

Keyword(s):

New Technologies ◽

High Volume ◽

Production Lines ◽

Particle Generation ◽

Car Body ◽

Conventional Technology ◽

Sheet Products ◽

Cost Efficient ◽

Aluminum Panels ◽

Fine Tune

Cost-efficient designs of aluminum autobody structures consist mainly of stampings using conventional technology. Progress in metallurgy and forming processes has enabled aluminum body panels to achieve significant market share, particularly for hoods. Fast bake hardening alloys with better hemming performance were developed for improved outer panel sheet products. Specific guidelines for handling and press working were established to form aluminum panels using similar schedules and production lines as steel parts. Stamping productivity was improved by optimization of the trimming process to reduce sliver/particle generation and resulting end-of-line manual rework. Both hemming formability and trimming quality not only depend on tooling setup but also on microstructural features, which govern intrinsic alloy ductility. Targets for the next high volume aluminum car body applications, such as roof panels and doors, require higher strength and/or better formability. The challenges of complex stampings can be met with optimized alloys and lubricants, with improved numerical simulation to fine-tune stamping process parameters, and with the introduction of new technologies. Warm forming was examined as a potential breakthrough technology for high volume stamping of complex geometries.

Download Full-text

The Influence of Surface Preparation of the Steel during the Renovation of the Car Body on Its Corrosion Resistance

Coatings ◽

10.3390/coatings11040384 ◽

2021 ◽

Vol 11 (4) ◽

pp. 384

Author(s):

Dariusz Ulbrich ◽

Jakub Kowalczyk ◽

Arkadiusz Stachowiak ◽

Wojciech Sawczuk ◽

Jaroslaw Selech

Keyword(s):

Corrosion Resistance ◽

Glass Bead ◽

Salt Spray ◽

Zinc Coating ◽

Surface Preparation ◽

The Other ◽

Average Thickness ◽

Spray Chamber ◽

Car Body ◽

Abrasive Blasting

The article presents the influence of the applied method used for removing the varnish coat on the corrosion resistance of the car body sheet. The tests were carried out on samples prepared from factory-painted car body elements with pearlescent, metallized and acrylic varnish. Removal of the varnish coat was performed by sandpaper grinding, glass bead blasting, disc blaze rapid stripping, soda blasting and abrasive blasting with plastic granules. The average thickness of the factory-painted coating depending on the type of lacquer ranged from about 99 to 140 µm. On the other hand, after removing the varnish, the thickness of the protective zinc coating ranged from 2 to 12.7 µm. The highest values of the zinc coating were obtained for samples in which the varnish was removed by the method such as soda blasting and abrasive blasting with plastic granules. For these two methods of surface preparation, the damage to the zinc layer protecting the steel against corrosion is the smallest and the percentage of zinc in the surface layer ranges from 58% to 78%. The final stage of the research was to test the samples after removing the varnish coat in a two-hour exposure to the corrosive environment in a salt spray chamber. Samples with the surface prepared by grinding with sandpaper reached the level of surface rusting Ri 5, while in the case of soda blasting and the use of plastic granules, no corrosion centers were observed on the surface of the car body sheet.

Download Full-text