The Influence of Ribbing of Mechanical Crank Press Cast C-Frames over the Stress State in Critical Areas

The research presented is directed to identify the ways to reduce stress state in critical areas of the C-frame of mechanical presses. Ribbing is a way to increase rigidity and a means to reduce energy consumption in operation. Hence, the objective is to design new frame models that would ensure that presented features are obtained. Starting from a reference model that was maintained as such, within the conducted study, an important part of the new solutions resulted by ribbing the lateral walls of the frame and determining three different distances between the ribs, as well as their various orientations. The finite element-FEM study of the resulted stress states was conducted for all devised models. FEA revealed that, in the new models with ribbed lateral walls, the maximum values of the stress have different evolutions for each of the three critical areas considered. In most new models, the maximum stress decreased by 2–5% in two of the critical areas and increased in the third. The study carried out allows the selection of the most performant of the new solutions and provides valuable information for application and further studies

The Influence of Mesh Density on the Results Obtained by Finite Element Analysis of Complex Bodies

Finite element analysis of complex bodies is frequently used in design to determine the size of deformations. Successive iterations, with progressive refinement of mesh densities, are most often required to obtain a sufficiently accurate convergent numerical solution. This process is costly, time consuming, and requires superior hardware and software. The paper presents a quick and effortless way to determine a sufficiently accurate value of the numerical solution. The mentioned solution is obtained by amending the numerical solution resulting for a certain value of the mesh density of the studied body with an adequate proportionality coefficient determined following the deformation study of simple bodies differently subject to external forces. It is assumed that the elastic displacement of the various bodies has a similar evolution as the mesh density increases and that the values of the proportionality coefficients considered are approximately equal for identical mesh densities. Examples presented are related to the reference body of the mechanical press PAI 25

The Influence of Ribbing of Mechanical Crank Press Cast C-Frames over the Stress State in Critical Areas

The research presented is directed to identify the ways to reduce stress state in critical areas of the C-frame of mechanical presses. Ribbing is a way to increase rigidity and a means to reduce energy consumption in operation. Hence, the objective is to design new frame models that would ensure that presented features are obtained. Starting from a reference model that was maintained as such, within the conducted study, an important part of the new solutions resulted by ribbing the lateral walls of the frame and determining three different distances between the ribs, as well as their various orientations. The finite element-FEM study of the resulted stress states was conducted for all devised models. FEA revealed that, in the new models with ribbed lateral walls, the maximum values of the stress have different evolutions for each of the three critical areas considered. In most new models, the maximum stress decreased by 2–5% in two of the critical areas and increased in the third. The study carried out allows the selection of the most performant of the new solutions and provides valuable information for application and further studies