The paper deals with a study and a comparison of numerical simulations of a bearing ring production using various numerical methods for solution. The bearing ring is produced by forging technology in three operations. The study is focused on the first two operations, i.e. upsetting and forging of...

The paper deals with an analysis of a hole flanging technology, especially with the influence of an initial hole production process on an ability of material to achieve the required expansion in the application for automotive industry, i.e.radius rod production. S420MC steel sheet with a thicknes...

The basic idea of a solar absorber’s thermal gain increase is the keyhole effect utilization during which the radiation is absorbed by multiple reflections on cavity walls. The lattice of pyramidal or conical cavities on the solar absorber surface can be formed to create a structured surface leading to its overall absorptivity increase and to a reduction of the surface absorptivity dependence on the solar radiation incident beam angle changes caused by the daily and annual solar cycles. This contribution concludes the results of simulations of the effect of cavity geometry, geographical position and absorber orientation on its thermal gain with respect to the technological manufacturability of cavities. Furthermore, the real construction of the absorber with a structured surface using laser welding and parallel hydroforming is briefly described.

Detail záznamu - Prediction of the stamped part thinning depending on its geometry and blank material - Detail záznamu - Vědecká knihovna UJEP