The influence of the deformation rate on the hot extrusion of axisymmetric hollow product
DOI:
https://doi.org/10.37142/2076-2151/2022-1(51)46Keywords:
hot extrusion with setting, hollow product, finite element method, deformation rate, force, temperature, stress, deformation.Abstract
Kaliuzhnyi V. L., Levchenko V. M., Yarmolenko O. S., Tahan L. V. The influence of the deformation rate on the hot extrusion of axisymmetric hollow product
The influence of the deformation rate on the process of hot backward extrusion with a setting made of high-carbon steel of an axisymmetric hollow product with a projection on the end of the bottom part was studied using finite element modeling. The speed of movement of the punch varied from 50 to 400 mm/sec. A computational analysis of the processes of extrusion with setting, the processes of extracting punches from deformed workpieces and the processes of pushing products out of dies was carried out. The dependence of the force of extrusion vs the movement of the punch, the dependence of the force of extraction of the punch vs its reverse movement and the dependence of the force of pushing the product out of the die vs the movement of the knock-out are established. The distribution of specific forces on the ends of the punch and the knock-out and along the height of the die surface are determined by the values of the normal stresses. Increasing in the rate of deformation from 50 to 200 mm/sec leads to a significant decreasing the force of deformation. Further growth of speed practically does not affect the amount of force. Recommendations for choosing press equipment are given. For the final stage of extrusion with setting, temperature distributions, the stress component and deformations in the deformed metal are shown. The cooling temperature in the metal layers located near the contacting surfaces, is determined. The final shape and dimensions of the product are established. To obtain a smooth end of the wall, an additional operation of cutting it is necessary. The processing of the metal structure by plastic deformation is estimated by the magnitude of the intensity of the deformations in the wall and the bottom part of the product. Simultaneously forming by backward extrusion with setting leads to more intensive processing of the metal structure by plastic deformation and reduces the unevenness of the intensity of deformations along the width of the product wall.
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