The Influence of Extrusion Ratio on Contact Stresses and Die Elastic Deformations in the Case of Cold Backward Extrusion

Pepelnjak, Tomaž; Milutinović, Mladomir; Plančak, Miroslav; Vilotić, Dragiša; Ranđelović, Saša; Movrin, Dejan

doi:10.5545/sv-jme.2015.3051

Cited by 7 publications

(6 citation statements)

References 14 publications

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“…FEM analysis has increased in confidence and can provide a first check on what works in the real world and what does not [5]. Various topics are simulated, starting with the most common mechanical issues up to thermal analysis, vibration frequency, forming simulations [6] to [8], fluid flow or injection moulding of plastic parts. Indeed, recently numerous specialists and users around the world have come to understand and implement FEM analysis.…”

Section: Integrating a New Software Tool Used For Tool Path Generatiomentioning

confidence: 99%

Integrating a New Software Tool Used for Tool Path Generation in the Numerical Simulation of Incremental Forming Processes

Nasulea¹,

Oancea²

2018

SV-JME

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In the incremental sheet forming simulation, finite element modelling typically was used to anticipate material behaviour, predict deformation forces, thickness reduction or to identify other information. Because the forming tool motions are difficult to be implemented in finite element method (FEM) software systems, and because of the large number of points that describe the tool path, in order to reduce data preparation time, this paper presents the implementation of a new software tool conceived by the authors in the process of the numerical simulation of incremental sheet forming. The software tool uses a CNC file in G-code format to reveal the interpolation point coordinates of the tool motions and the positioning time in a specific ANSYS format. Usually, a tool path for an incremental sheet forming process consists of thousands of interpolation points and is very difficult and time-consuming to implement manually into a FEM software system. The new software tool solves this issue, at least for ANSYS software, being swift and easy to use. The paper also presents how the software tool is integrated and validated in a case study of an incremental sheet forming process simulation concerning different part configurations.

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Section: Integrating a New Software Tool Used For Tool Path Generatiomentioning

confidence: 99%

Integrating a New Software Tool Used for Tool Path Generation in the Numerical Simulation of Incremental Forming Processes

Nasulea¹,

Oancea²

2018

SV-JME

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“…Zhao et al [19] employed the Pareto-based genetic algorithm to perform the multiobjective optimization for porthole extrusion die with the purpose to achieve the uniform velocity distribution and reduce the deflection and maximum stress on the extrusion die. Bingöl et al [20] and Pepelnjak et al [11] have also validated the numerical calculations by developing experimental techniques and devices for measuring accurate stresses on die tools.…”

Section: Introductionmentioning

confidence: 99%

“…Kouzilos et al [9,10] examined the mechanical stresses exerted on the spider leg of the spider type extrusion die by a fully coupled fluid-structure interaction analysis, which was realized with a commercial finite element software, COMSOL Multiphysics. Both the contact stresses along the die-workpiece interface and elastic deformation behaviour of the die in the cold backward extrusion of steel billets have been investigated and numerically by Pepelnjak et al [11].…”

Section: Introductionmentioning

confidence: 99%

Coupled thermal-structural modelling and experimental validation of spiral mandrel die

Nie

Cameron

Sienz

et al. 2020

Int J Adv Manuf Technol

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The conventional theoretical method to calculate deformations and stress states is only limited to a few cases of simple extrusion dies due to a number of assumptions and simplifications. A coupled thermal-structural modelling framework incorporating finite element method is thus developed and implemented to determine the mechanical performances of the complicated spiral mandrel die, which has a complex geometrical feature of spiral grooves and is exposed to severe conditions of thermal load and high pressure. The steady-state thermal analysis is carried out by mapping the temperature load on the flow channel from previously simulated flow characteristics of polymer melt. The structural analysis takes inputs from both thermal analysis and previously simulated pressure on polymer melt. Both the temperature and pressure loads on flow channel are transferred via the Smart Bucket Surface mapping algorithm. The mechanical properties of the spiral mandrel die are evaluated by analysing the deformation and stress distribution. The experimental validation is conducted to demonstrate the effectiveness of the numerical model. The effects of both structure parameters of the spiral mandrel and processing parameters upon the maximum stress in the die body and the maximum pressure induced deformation at the die orifice are investigated.

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“…Combining the reverse and radial extrusion schemes in the manufacture of hollow parts with a flange improves technological capabilities of the processes of precision volumetric stamping by reducing the energy and labor intensity of production and increasing a metal utilization factor. However, along with these advantages, there are a series of problems, primarily related to the issues of plasticity and hardening of metal under conditions of the complex stressed-deformed state [5,6]. In addition, despite the high efficiency of the combined extrusion processes, examples of their practical implementation are limited.…”

Section: Introductionmentioning

confidence: 99%

Investigating the process of shrinkage depression formation at the combined radial-backward extrusion of parts with a flange

Hrudkina

Aliievа

Abhari

et al. 2019

EEJET

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Досліджено можливості використання енергетичного методу для прогнозування дефектоутворення у вигляді утягнення в процесах комбінованого видавлювання. Запропоновано математичну модель процесу комбінованого радіально-зворотного видавлювання порожнистих деталей з фланцем з урахуванням виродження трапецеїдального модуля у прямокутний. Відокремлені етапи процесу деформування в залежності від величину ходу активного інструменту в порівнянні з товщиною дна стакану. Розроблено узагальнюючу розрахункову схему процесу комбінованого радіально-зворотного видавлювання деталей з фланцем з урахуванням заключної стадії деформування (H дна

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The Influence of Extrusion Ratio on Contact Stresses and Die Elastic Deformations in the Case of Cold Backward Extrusion

Cited by 7 publications

References 14 publications

Integrating a New Software Tool Used for Tool Path Generation in the Numerical Simulation of Incremental Forming Processes

Integrating a New Software Tool Used for Tool Path Generation in the Numerical Simulation of Incremental Forming Processes

Coupled thermal-structural modelling and experimental validation of spiral mandrel die

Investigating the process of shrinkage depression formation at the combined radial-backward extrusion of parts with a flange

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