Semi-hot and hot backward extrusion with expansion of an axisymmetric hollow part
DOI:
https://doi.org/10.37142/2076-2151/2023-1(52)10Keywords:
finite element method, hot and semi-hot reverse extrusion, distribution, hollow part, force, temperature, stress, deformation, strain intensity.Abstract
Kaliuzhnyi V., Sytnyk S., Savchenko D., Chuchin O. Semi-hot and hot backward extrusion with expansion of an axisymmetric hollow part.
Using the finite element method, the process of semi-hot and hot backward extrusion with the expansion of a hollow part made of mild steel with protrusions on the bottom was simulated. The purpose of the work was to obtain, using the finite element method, the influence of the temperature of the initial workpiece on the parameters of semi-hot and hot reverse extrusion with distribution of an axisymmetric hollow semi-finished product. The initial dimensions of the workpiece to obtain a semi-finished product with the required shape and dimensions are determined. The temperature of the workpiece for semi-hot extrusion was 700°C, for hot 1000°C. The process of reverse extrusion with the distribution of a hollow semi-finished product is described step by step. The process of reverse extrusion with distribution and the process of pushing the finished product out of the matrix are analyzed. The dependence of the force of the process of reverse extrusion with delivery on the movement of the punch and the dependence of the force of pushing out the formed hollow semi-finished product from the matrix on the movement of the ejector for semi-hot and hot reverse extrusion with distribution were determined. The distribution of specific forces on the ends of the punch, ejector and along the height of the working surface of the matrix was determined using the values of normal stresses. The final shape and dimensions of the hollow semi-finished product are established. The development of the metal structure in the wall and in the bottom part of the product by plastic deformation was analyzed using the value of the intensity of deformations. Near the contact surfaces between the workpiece and the working tool, the cooling temperature is shown. The distribution of temperature, stress and strain for the final stage of molding is shown.
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