scholarly journals Automatic re-lubrication by pulsating motion with punch having dimple bottom in backward extrusion of cylindrical cup

2020 ◽  
Vol 50 ◽  
pp. 231-235
Author(s):  
Tomoyoshi Maeno ◽  
Hiroki Homma ◽  
Ryohei Ikeda ◽  
Ken-ichiro Mori
Keyword(s):  
Backward Extrusion ◽  
Cylindrical Cup

Influence of Processing Parameters on Bonding Conditions in Backward Extrusion Forged Bonding

2012 ◽  
Vol 504-506 ◽  
pp. 387-392 ◽  
Author(s):  
Yoshinori Yoshida ◽  
Takamasa Matsubara ◽  
Keisuke Yasui ◽  
Takashi Ishikawa ◽  
Tomoaki Suganuma
Keyword(s):  
Tensile Test ◽  
Processing Parameters ◽  
Expansion Ratio ◽  
Cold Forging ◽  
Process Conditions ◽  
Backward Extrusion ◽  
Metallurgical Bonding ◽  
Wire Cutting ◽  
Surface Expansion ◽  
Cylindrical Cup

In this study, conditions of metallurgical bonding between steel and aluminum in cold forging process is investigated. Two-layered cylindrical cup of the materials is produced in cold backward extrusion in five processing velocity conditions. Small tensile test specimens are cut off at the bonding boundary in the product using a wire-cutting machine and the bonding strength on the boundary is measured in tensile test using the specimens. Fractured contact surfaces are observed with an electron microscope for investigation of bonding. Finite element analyses for the backward extrusion are conducted and surface expansion ratio and interface pressure on the boundary are calculated. The influence of process conditions, extrusion velocity and surface expansion ratio and boundary pressure, on the bonding are investigated.

scholarly journals Evaluation of Anti-galling Ability of Zinc Phosphate Coating by Backward Extrusion of Cylindrical Cup

2019 ◽  
Vol 60 (696) ◽  
pp. 8-12
Author(s):  
Osamu KADA ◽  
Zhigang WANG ◽  
Kei MIYANISHI ◽  
Hidekazu YANAGI ◽  
Yukari NOSE
Keyword(s):  
Zinc Phosphate ◽  
Phosphate Coating ◽  
Backward Extrusion ◽  
Cylindrical Cup

Numerical Simulation for Microstructure Evolution in In718 Alloy During Cylindrical Cup Backward Extrusion

2013 ◽  
Vol 650 ◽  
pp. 92-97 ◽  
Author(s):  
X. Hu ◽  
R. B. Mei ◽  
F. Zhu ◽  
Y. Fan ◽  
Y. B. Liang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Grain Size ◽  
Dynamic Recrystallization ◽  
Microstructure Evolution ◽  
Cylinder Wall ◽  
Backward Extrusion ◽  
Average Grain Size ◽  
Higher Temperature ◽  
Cylindrical Cup ◽  
Deform 3D

A coupled numerical simulation between thermal-mechanical and microstructure evolution was realized through embedding the developed user subroutines into the FEM software DEFORM-3D system. Then the dynamic recrystallization fraction and average grain size of In718 alloy in cylindrical cup backward extrusion with different parameters was solved and analyzed. The complete dynamic recrystallization occurs in the middle of cylinder wall and the grain size is the finest. However, the grain size of top of cylinder wall changes less because of the less plastic deformation. Furthermore, higher speed of punch is useful to the DRX but it is not enough time to occur dynamic recrystallization completely with much higher speed of punch. In spite of more recrystallization occurring in the bottom, the grains grow in the cylinder wall so that much higher temperature goes against improving finer and uniform of grain size. Therefore, it is better for obtaining finer and uniform grain size with 1000(°C)-1050(°C) and 5(mm/s) in In718 alloy cylindrical cup backward extrusion according to the research.

Evaluation of anti-galling ability of zinc phosphate coating by backward extrusion of cylindrical cup

2020 ◽  
Vol 285 ◽  
pp. 116765 ◽  
Author(s):  
Osamu Kada ◽  
Zhigang Wang ◽  
Kei Miyanishi ◽  
Hidekazu Yanagi ◽  
Yukari Nose
Keyword(s):  
Zinc Phosphate ◽  
Phosphate Coating ◽  
Backward Extrusion ◽  
Cylindrical Cup

Estimation of square die backward extrusion forces of bar stock

2020 ◽  
pp. 462-465
Author(s):  
A.A. Pasynkov ◽  
S.N. Larin ◽  
G.A. Nuzhdin
Keyword(s):  
Backward Extrusion ◽  
Nite Element ◽  
Die Extrusion ◽  
Element Method

Тhe results for estimation of the square die extrusion forces of cylindrical billets are presented. The study is performed on the basis of the fi nite element method. The results obtained during the simulation are analyzed statistically. Regression dependences for forces are obtained, with the help of which reverse extrusion studies are performed.

Cazacu and Barlat Criterion Identification Using the Cylindrical Cup Deep Drawing Test and the Coupled Artificial Neural Networks – Genetic Algorithm Method

2012 ◽  
Vol 504-506 ◽  
pp. 637-642 ◽  
Author(s):  
Hamdi Aguir ◽  
J.L. Alves ◽  
M.C. Oliveira ◽  
L.F. Menezes ◽  
Hedi BelHadjSalah
Keyword(s):  
Genetic Algorithm ◽  
Finite Element ◽  
Deep Drawing ◽  
Inverse Analysis ◽  
Computational Time ◽  
Ann Model ◽  
Drawing Test ◽  
Artificial Neural ◽  
Deep Drawing Test ◽  
Cylindrical Cup

This paper deals with the identification of the anisotropic parameters using an inverse strategy. In the classical inverse methods, the inverse analysis is generally coupled with a finite element code, which leads to a long computational time. In this work an inverse analysis strategy coupled with an artificial neural network (ANN) model is proposed. This method has the advantage of being faster than the classical one. To test and validate the proposed approach an experimental cylindrical cup deep drawing test is used in order to identify the orthotropic material behaviour. The ANN model is trained by finite element simulations of this experimental test. To reduce the gap between the experimental responses and the numerical ones, the proposed method is coupled with an optimization procedure based on the genetic algorithm (GA) to identify the Cazacu and Barlat’2001 material parameters of a standard mild steel DC06.

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