Experimental study of a new process of deformation of forgings such as sleeves
DOI:
https://doi.org/10.37142/2076-2151/2023-1(52)79Keywords:
hollow billet, deformation without a mandrel, broach, forging a hole, elongation of a billet.Abstract
Markov. Е., Molodetskyi V., Zinskyi V., Payman А. Experimental study of a new process of deformation of forgings such as sleeves.
A study of a new method for the manufacture of hollow sleeves has been carried out. The proposed method consists in the deformation of a hollow billet with a bottom without a mandrel. A technique for conducting experimental studies based on the law of similarity is proposed. The technique is designed to determine the elongation, forging of the inner diameter and increase in the wall thickness of a hollow billet when deforming hollow forgings with a bottom without using a mandrel. The variable parameters were the hole diameter of the hollow billet, which varied in the range of 0.3 ... 0.8. The hole diameter of the hollow billet was established, which decreases when deformed by the developed method. Regularities were established for the intensity of drawing and the increase in the wall thickness of the hollow billet. A parameter has been proposed to determine the draw ratio of the hollow billet. It was noted that with an increase in the diameter of the hole, the intensity of elongation of the hollow billet increases and the degree of closing of the inner diameter decreases. The defining regularity of the studied deformation schemes is that the value of hollow billet drawing practically does not change depending on the degree of deformation for the same initial geometric parameters of the hollow billet. As a result, an efficient feed was determined which increases the draw ratio of the hollow billet and reduces the forging ratio of the inner cavity. The effective feed should be in the range of 10...15% of the original workpiece diameter. These results were established on samples of lead with the addition of antimony. It has also been found that when the hole diameter of the hollow billet is approximately 0.55 of the billet diameter, there is an intensive increase in the wall thickness of the billet. The error of the obtained experimental results is 7...11%. The established dependences make it possible to determine the final diameter of the hollow blank hole. The results of the study made it possible to establish that the deformation of hollow blanks without a mandrel is possible. The developed new method expands the technological capabilities of the processes for manufacturing sleeve-type forgings.
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