Investigating the process of shrinkage depression formation at the combined radial-backward extrusion of parts with a flange
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2019, Vol 5, Issue 1
Abstract
<p>The possibilities of using an energy method to forecast defect formation in the form of shrinkage depression in the combined extrusion processes have been investigated. We have proposed a mathematical model of the combined radial-reverse extrusion process of hollow details with a flange, taking into consideration the degeneration of the trapezoidal module into a rectangular one. Separate stages in the deformation process have been defined, depending on the magnitude of the active tool stroke compared with the thickness of the bottom of the cup. We have devised a generalized estimation scheme for the process of combined radial-reverse extrusion of parts with a flange taking into consideration the final stage of deformation (<em>H<sub>bottom</sub></em><<em>h</em><sub>1</sub>). The magnitude of the reduced pressure of deformation has been derived as a function of the geometric, technological, and kinematic parameters of the extrusion process. A role of the kinematic parameter of the process belongs to a relative speed of metal flow in the vertical direction (filling the cup’s wall at the inverse flow of metal). The magnitude for the reduced pressure of deformation has been optimized based on this parameter. We have analyzed the character of change in the optimum magnitude of a relative speed of metal flow in the vertical direction in the course of the process. The differences have been established in the derived dependences of a given kinematic parameter for the process with the formation of shrinkage depression in the bottom part of a component and without defect formation.</p><p>It has been substantiated that the use of combined extrusion in the manufacture of hollow parts with a flange, when compared with the application of simple schemes of deformation, improves the technological capabilities of the process. We have proven that the technologies for introducing combined extrusion had not been sufficiently studied and there is a lack of recommendations on predicting the formation of a defect in the form of shrinkage depression. The estimation scheme has been proposed for the radial-reverse extrusion process, taking into consideration the emergence of shrinkage depression at the final stage of deformation. We have modeled the process of combined extrusion of hollow parts with a flange and established the influence of friction conditions on the time of the emergence of shrinkage depression in the bottom part of a component.</p>It has been confirmed that the proposed generalized estimation scheme makes it possible to predicting the occurrence of a defect in the form of shrinkage depression at all stages and under different technological conditions for a deformation process. Obtaining a preliminary assessment, based on it, of possible defect formation would facilitate the development of appropriate technological recommendations to avoid defects of this type
Authors and Affiliations
Natalia Hrudkina, Leila Aliieva, Payman Abhari, Oleg Markov, Liudmyla Sukhovirska
Keywords
Related Articles
- EP ID EP664143
- DOI 10.15587/1729-4061.2019.179232
- Views 72
- Downloads 0
Development of a criteriabased approach to agroecological assessment of slope agrolandscapes
<p class="a">For the forecast and management of erosion processes in order to protect the environment, information is needed on the state of its components and impact factors as well as the results of this impact. The ex...
Development of a method for computer simulation of a swinging spring load movement path
<p>Studies of geometric modeling of non-chaotic periodic paths of movement of loads attached to a variety of mathematical pendulums were continued. Pendulum oscillations in a vertical plane of a suspended weightless spri...
Development of effective technique for the disposal of the Prunus armeniaca seed shells
We proposed a new technique for the disposal of solid plant waste in the food industry, specifically solid shell of Prunus armeniaca seeds, by oxidative treatment with a hydrogen peroxide solution in an acetic acid mediu...
Modeling the parallelism of empirical models of optimal complexity using a Petri net
<p>Many physical processes and phenomena in view of their complexity cannot be described analytically. In these cases, empirical modeling is applied. In this research, the method based on the genetic approach is used to...
Determining special features in the topography of paper with water marks at the micro and nanolevels
<p>We have studied the surface structure of tamper-proof paper with positive and negative watermarks at different scales ‒ from a micrometer to a nanometer level, by using the methods of contact profilometry and atomic f...