Forming hollow parts by combined extrusion methods
Abstract
Aliieva L. I., Abhari P. B., Malii K. V., Samoglyadov A. D., Shimko A. I. Forming hollow parts by combined extrusion methods // Herald of the DSEA. – 2019. – № 2 (46). – P. 51–58.
The main methods of combined extrusion with hollow cylindrical and conical parts from the initial solid billets are considered. Combined extrusion in cups with flange is located at the bottom, should use a scheme such as combining radial and backward extrusion methods. To assess the deformed condition of parts, methods of dividing grids and microstructural analysis are considered. The investigation results are in qualitative agreement with finite element analyses. It is determined that the process occurs with acceptable uneven deformation with the section of the part and provides an acceptable investigation of the structure and hardening throughout the volume of the part. Consistent radial-forward extrusion - a method of obtaining parts such as deep sleeves and cups from the original solid billet. The proposed method with experimental investigation are showed that to make manufacturing complex profiled hollow parts with a variable wall thickness and a stepped cavity or outer surface. Extrusion methods to make parts such as cup with a thick bottom, according to which, in order to reduce the unevenness of deformation along the section of the part, metal in the bottom zone of the cup is subjected to alternating deformation by forward extrusion in branches and return radial extrusion into the bottom zone. Finite element simulation in extrusion process to make hollow conical part by software program as Deform-2D is considered. Change in the kinematics of the hollow conical part and the strain intensity distribution, confirming the general characters in the distribution of deformations with hollow parts such as cups with a blind hole are determined.
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