SCIDAR - Дигитална архива Универзитета у Крагујевцу

Friction on the work part flange very significantly influences the deep drawing process. Blank holding force (BHF) is normal force for that friction. Presented in the paper are short review of analysis of for type variable BHF (VBHF) influence during the process. The experimental researches were performed on a special laboratory computer device. Realized are pure deep drawing process (drawing ratio 2) of the Al−alloy sheet metal, with dry surfaces. Influence of VBHF monitored mainly through...

The paper includes the topic of deflexion appearances at thin sheet metals and sheet metals of increased hardnes. The tendency of sheet metals towards deflexion has been investigated in laboratory conditions by one-axis straining of square test-tube - so called Yoshida test. In parallel with physical modeling, the numerical simulation of the test was performed by use of program package PAK, developed on the basis of finite elements method. At physical-numerical modeling, the material brends (...

Development of high strength steel sheets (HSS) is lasting more than two decades, starting from microalloyed to TRIP, SULC, and other multiphase HSS. Application of HSS is increasing particularly in automotive industry because they have very favorable relation of weight to stiffness. Presented in the paper are critical review of most relevant HSS properties with experimental results of formability obtained on Faculty of Mechanical Engineering in Kragujevac (Serbia and Montenegro). Special att...

During the last few years the consumption of new materials in fabricatin of passenger cars has grown. The application of Al-alloys sheet matal, first of all in the manufacture of carbody elements, is extremely important. Formability of Al-alloys is reduced in comparison to steel sheet matals. That is why the tribological conditions and formability parameters are extremely important in deep drawing process. This papers presents the results of research in the area of mechanism of friction in th...

Friction on the work part flange very significantly influences the deep drawing process. Blank holding force (BHF) is normal force for that friction. Presented in the paper are short review of analysis of for type variable BHF (VBHF) influence during the process. The experimental researches were performed on a special laboratory computer device. Realized are pure deep drawing process (drawing ratio 2) of the Al−alloy sheet metal, with dry surfaces. Influence of VBHF monitored mainly through ...

Deep Drawing of Square Pieces With Variable Tribological Conditions on the Flange The research results of blank holding force (BHF) influence on the process of plastic forming are presented in this paper. BHF is the normal force and very important factor of friction on the flange. BHF control enables friction control and in that way significant influence on the forming process. Geometry of the work piece is prismatic with square cross section. Material is standard deep drawing thin sheet ...

Modern metal forming technologies are characterized by: development of metal forming procesess – determination of stress-strain field on the aim of optimization of forming parameters, application of CAD/CAM system for design and tool manufacturing, development of artificial inteligence and expert systems in forming system, development of methods, tools and machines for Net Shape forming. This paper presents review of actual forming methods, elements of new materiasl formability, and example...

In this paper results of experimental investigations of galvanized sheet metal zinc coated at one side (marked TyZnI) will be given. Material is 0,8 mm thick. Work piece is of a cylindrical geometry with diameter 50 mm. Blank diameter is 50 mm. Blank diameter is 110 mm. For that geometry, variable holding force (VBF) dependence was obtained by empirically−analytical procedure. Functions were obtained at given condition of constant specific holder pressure (VBF decreasing dependence). In t...

In practical applications, TiNi shape memory alloys (SMAs) exhibit behavior that can pose a challenge with current constitutive models and their implementations in finite element method (FEM) software. TiNi SMA devices typically operate in the forward or reverse martensitic transformation regime, which is known as subloop loading. During such cyclic loading–unloading, the hysteresis stress–strain loop changes because of material damage, which can be considered the fatigue of TiNi SMAs. Du...