Research of the method of rolling projectile from tubular workpiece
Abstract
Markov O., Shevtsov S., Aldokhin M., Panov V., Rovenskyi S.
Research of the method of rolling projectile from tubular workpiece
The work is aimed at solving the current technical and scientific problem regarding the improvement of the technological processes of the production of blanks for parts such as artillery shells based on the application of the operation of tangential rolling with a friction tool, which makes it possible to manufacture hollow parts with a bottom. The finite element method was used to simulate the technological process of rolling the bottom with a friction tool, which made it possible to determine the rational shape and dimensions of the rolled pipe blanks and their preheating temperature. Recommendations have been developed for the design of energy-saving technological processes of rolling parts such as sleeves, which allow to set the wall thickness of the pipe billet before rolling, the heating temperature of hollow billets, as well as the amount of relative feed of the billet to the friction tool. The established recommendations were verified by experimental studies on steel blanks. According to the research results, it was established that the rolling of spherical bottoms should be implemented for pipe blanks with a relative wall thickness (D/s), which is in the range of 15...20. The homologous heating temperature of the hollow billet was 0.8, and the relative feed of the pipe billet into the friction tool was 0.9. Approbation of the determined ratios in laboratory conditions proved that there are established recommendations for changing the shape and size of spherical bottoms in the process of tangential rolling with a friction tool. The laws of shape change of the workpiece revealed in the work expanded the technological possibilities of the process of tangential rolling of bottoms and made it possible to establish the possibilities of the researched process. The results of macrostructural studies on steel products confirmed the results of finite element modeling on the effect of tangential rolling of the spherical bottom on support in the axial zone. Based on the results of research, it was established that this method can be used for products that have a bottom with an axial hole (artillery shells, hydraulic cylinders, etc.). Axial defects in this case will be removed when drilling an axial hole.
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