International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Contactless techniques for evaluating pressing shapes, as part of the Industry 4.0 framework, are increasingly adopted in industry. Springback assessment is critical for verifying the final geometry of automotive body panels. Although 2D photogrammetric methods have been in use for over a decade, 3D optical surface-scanning systems are now preferred due to their superior accuracy. This study evaluates cylindrical pressings with flat and hemispherical bottoms, fabricated from 1.6 mm thick DP800 dual-phase steel. Thickness distribution was measured using the GOM Scan 1 device. Experimental results were compared against numerical simulations performed in PamStamp software, employing the Vegter Lite yield criterion and Krupkowski hardening law. Real cups (50 mm diameter) were deep-drawn from 90 mm blanks on an Erichsen 145-60 testing machine, with plastic foil lubrication. The thickness profiles obtained from scanned data were directly compared with simulation predictions to assess model accuracy and springback behaviour.

Nowadays, a lot of emphasis is placed on the car safety. It’s very difficult to ensure the highest possible body strength using conventional tests. The correct testing method is the basis for the safety of the car bodies. It is less expensive and time-consuming to apply deformation characteristics testing to selected types of steel than to produce a complete body and then test its deformation properties. The three-point bending test makes it possible to determine the absorption potential of the selected sheet metal. The purpose of this article is to evaluate innovation potential of the multiphase Trip steel, which is used in the automotive industry for the body-in-white structural components, and deformation elements mainly.

This work deals with corrosion measurements of galvanized steel HCT600X+Z subjected to progressively increasing plastic strain. The corrosion resistance measurements were carried out by non-destructive EIS (electrochemical impedance spectroscopy) test and destructive LP (linear polarization) test. As a result of the work, the measured data were analyzed and the results were processed using Nyquist diagram and Tafel analysis.

The paper provides an overview of the load-bearing capacity of joints of the same and unequal thin steel sheets formed on different pretreated surfaces by adhesive bonding. Four types of surface preparation and rubber-based adhesive were tested. The joints were subjected to a climatic test according to VW: PV1200. The change in the load-bearing capacity of the joints was evaluated on the basis of the force at the joint failure, the type of failure and on the basis of the load to displacement ratio.

The paper is focused on research results of dissimilar materials joining by adhesive bonding. Galvanized and non-galvanized steel sheets with a thickness of 0.8 mm were joined together. To compare the effect of the presence or absence of the Zn layer on the strength of the adhesive joints, control joints were made, consisting only of galvanized and only of non-galvanized materials. The materials were joined on one hand without any surface preparation, and on the other hand prepared by degreasing and mechanical roughening with sandpaper. Epoxy/PVC-Polymerblend adhesive with glass beads was used for bonding to check the thickness of the adhesive. The tensile lap-shear strength was tested according to DIN EN 1465. The joints made of galvanized materials only proved the highest, the joints made of nongalvanized materials only proved the lowest shear strength. The mixed joints did not reach the joint strength of galvanized materials, but exceeded the joint strength of non-galvanized materials. The adhesion of the adhesive to non-galvanized substrates seems to be the limiting factor of the strength of mixed joints