Josip Cumin

University of Osijek | UNIOS

Vehicle maintenance over the last few years has become more expensive due to the COVID related crisis, spare parts transportation problems, and latest price rises - related to war over Ukraine. There is also evident rise in fuel and lubricant prices, which is related to crude oil price rises. So, due to this reasons, older types of motorcycles and...

This paper concerns the wear of the working area of the permanent mould is strictly related to downfall in its functional properties. It may be caused by several different physical and chemical processes occurring during its exploitation and resulting mainly from the working conditions. The simplest wear factor is the material loss in the functiona...

The production of compensators (expansion joints), and especially of bellows as their most demanding elements, requires the usage of stainless materials. These stainless materials exhibit certain particularities at welding (and quality control) since they are very thin, i.e., their thickness ranges usually from 0.12 to 3.00 mm. This paper starts wi...

This paper presents the results of FEM numerical simulations, of the HC260Y steelsheet mechanical clinching process. The starting tool parameters were chosen for the central composite design of experiments, in order to find out which tool parameters have the largest contribution to the sheet joint interlock. Assessment of the mathematical model, an...

This paper describes the successful repair of a crack occurring at a centrifugal pump housing, by applying the Metalock joining procedure. The crack was analyzed and the appropriate Metalock key was selected for the repair. The selection of the most appropriate Metalock joining key was based on empirical parameters and on the tensile test results....

This paper presents statistical analysis of the parameters in the V-tool bending process of the HC260Y steel. Assessment of the mathematical model and analysis of variance (ANOVA) were performed within the design of experiments. The hydraulic testing machine Amsler and the developed V-tool were used in the experiments.

The automobile chassis is produced from various metal formed parts that are welded together. Trends in the automobile industry show that most of the car manufacturers tend to use high strength, lightweight materials. The main reasons for this are minimization of the used material and better fuel economy of the produced cars. Such lightweight materi...

This paper deals with the effects of technological parameters used in the V-die bending process, on the obtained product properties and dimensions. By variation of the tool geometry, several cases of steel sheet bending process are observed through the FEM simulations. Also by variation of different mechanical material properties, effects on produc...

Today there is widespread usage of high strength steels (HSS), and ultra high strength steels (UHSS) in the manufacturing industry. Especially in the automobile industry for the rigid and light weight chassis components made out of high strength steel. During sheet metal forming material undergoes plastic deformations and after the process of formi...

The paper deals with a possibility of abrasive waterjet application for disposal of discarded munitions. Based on the analysis of current state it has been found out that the surplus munitions and the discarded munitions are destroyed mostly by using conventional techniques such as dumping at sea, outdoors burning, outdoors detonation, mining deton...

Today there is widespread usage of high strength steels (HSS), and ultra high strength steels (UHSS) in the manufacturing industry. Especially in the automobile industry for the rigid and light weight chassis components made out of high strength steel. During sheet metal forming material undergoes plastic deformations and after the process of formi...

The paper deals with a possibility of abrasive waterjet application for disposal of discarded munitions. Based on the analysis of current state it has been found out that the surplus munitions and the discarded munitions are destroyed mostly by using conventional techniques such as dumping at sea, outdoors burning, outdoors detonation, mining deton...

This article deals with the theory and application of a hydroforming process. Nowadays automobile manufacturers use high strength sheet metal plates. This high strength steel sheet metal plates are strain hardened in the process of metal forming. With the use of high strength steel, cars are made lightweight, which is intended for low fuel consumpt...

NUMERICAL SOLVING OF BALLISTIC FLIGHT EQUATIONS FOR BIG BORE AIR RIFLE This paper is about solving ballistic equations by means of numerical mathematics. Ballistic flight equations are applied for modern big bore air rifles, operated with high pressure carbon-dioxide (CO2,) gas. Ballistic equations use air drag function for obtaining results. Toda...

This paper is about solving ballistic equations by means of numerical mathematics. Ballistic flight equations are applied for modern big bore air rifles, operated with high pressure carbon-dioxide (CO2) gas. Ballistic equations use air drag function for obtaining results.Today there are many complex commercial ballistic programs on market, based on...