Studium procesu spęczania ze strefą odkształcenia o zmiennym położeniu
This monograph presents the numerical and experimental results of a study investing a new upsetting process for stepped parts that is conducted with varying position of the deformation zone. In the beginning, a state of the art of the problem is given, with a review of manufacturing methods for step...
Guardado en:
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| Formato: | Online |
| Lenguaje: | polaco |
| Publicado: |
Lublin University of Technology Publishing House
2025
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| Materias: | |
| Acceso en línea: | https://directory.doabooks.org/handle/20.500.12854/170123 |
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| Sumario: | This monograph presents the numerical and experimental results of a study investing a new upsetting process for stepped parts that is conducted with varying position of the deformation zone. In the beginning, a state of the art of the problem is given, with a review of manufacturing methods for stepped parts, including various techniques that use sections of rods or tubes as starting material and are conducted on specialized or universal forging machines. Based on the conclusions drawn from the literature review, a new forming method is developed, which makes it possible to produce solid and hollow parts that have a variable cross section over their length. The new method is based on upsetting in which the deformation zone changes its position as a result of tool kinematics. The process is carried out on a universal forging press in which a specially designed instrument is mounted. First, a theoretical analysis is performed based on calculations made by the finite element method. The preliminary calculations are performed in order to design a numerical model of the proposed method. The following are determined: the flow curve of the deformed material and friction conditions between the workpiece and the tools. In addition, the buckling of the workpiece (both a rod and a tube) that can occur at an early stage of the upsetting process conducted with the position-changing deformation zone is analyzed. Obtained numerical results are then used to determine the impact of selected technological parameters on the course of the upsetting process and product quality. In effect, a specialized instrument is designed and constructed for carrying out experiments to validate the proposed technique. Some components of the instrument are driven by a universal forging press slide, whereas others are driven by forces that are generated by hydraulic cylinders of this instrument. Similarly to the numerical results, experimental findings have shown that the proposed method can be used for forming both solid and hollow stepped parts. After that, potential applications of the developed technique are demonstrated, showing that the new method can also be used for manufacturing geometrically complex products that are formed in several stages. Finally, relevant conclusions are presented. |
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