scholarly journals Assessment of Metal Flow Balance in Multi-Output Porthole Hot Extrusion of AA6060 Thin-Walled Profile

Metals ◽  
2018 ◽  
Vol 8 (6) ◽  
pp. 462 ◽  
Author(s):  
Xin Xue ◽  
Gabriela Vincze ◽  
António Pereira ◽  
Jianyi Pan ◽  
Juan Liao
Keyword(s):  
Metal Flow ◽  
Hot Extrusion ◽  
Flow Balance ◽  
Thin Walled

scholarly journals Role of die structures on metal flow balance in multi-output porthole extrusion of thin-walled profile

2018 ◽  
Vol 15 ◽  
pp. 225-231
Author(s):  
Xin Xue ◽  
Gabriela Vincze ◽  
António B. Pereira ◽  
Juan Liao ◽  
Jianyi Pan
Keyword(s):  
Metal Flow ◽  
Flow Balance ◽  
Thin Walled ◽  
Porthole Extrusion

The origin of weld seam defects related to metal flow in the hot extrusion of aluminium alloys EN AW-6060 and EN AW-6082

2014 ◽  
Vol 214 (11) ◽  
pp. 2349-2358 ◽  
Author(s):  
A.J. den Bakker ◽  
R.J. Werkhoven ◽  
W.H. Sillekens ◽  
L. Katgerman
Keyword(s):  
Aluminium Alloys ◽  
Weld Seam ◽  
Metal Flow ◽  
Hot Extrusion

Non-Uniform Deformation Characteristic of in 690 Superalloy Tube in Glass Lubricated Hot Extrusion

2010 ◽  
Vol 145 ◽  
pp. 332-339 ◽  
Author(s):  
Chao Yang Sun ◽  
Bin Liu ◽  
Qing Dong Zhang ◽  
Rui Li
Keyword(s):  
Strain Distribution ◽  
Adaptive Mesh Refinement ◽  
Metal Flow ◽  
Deformation Characteristic ◽  
Hot Extrusion ◽  
Adaptive Mesh ◽  
Uniform Deformation ◽  
Deformation Index ◽  
Deformation Problem ◽  
Preheating Temperature

A two-dimensional axi-symmetric finite element model for the tube hot extrusion process was developed based on Deform-2D software by consideration of the billet transfer, glass lubrication and the constitutive characteristics of IN 690 superalloy. An enhanced technique for adaptive mesh refinement (AR) is used to solve the large deformation problem. This model was then used to study the effect of boundary conditions and process parameters in tube hot extrusion. The Non-uniform deformation index as the representative parameter, which denotes the non-uniform deformation during the steady state of tube hot extrusion, is presented accordance to the feature of metal flow at deformation zone. The bigger of Non-uniform deformation index, the worse of non-uniform strain distribution. When the non-uniform deformation index getting smaller, the equivalent strain distribution along the length and cross section become more uniform and better product quality could be obtained. An increase in the billet and die preheating temperature could reduce the non-uniform deformation index individually. But the billet and die preheating temperature should not be too high. The increase of friction coefficient, the non-uniform deformation index also increased, which indicate appreciable results of metal flow. With the ram speed increase, the non-uniform deformation index decreases, but too fast speed is inadmissibility.

Application of Simulation Technology to Hollow Die Extrusion

2007 ◽  
Author(s):  
N. Takatsuji ◽  
T. Inagaki ◽  
S. Murakami ◽  
K. Matsuki
Keyword(s):  
Sliding Friction ◽  
Metal Flow ◽  
Fem Analysis ◽  
Hot Extrusion ◽  
Equivalent Strain ◽  
Extrusion Pressure ◽  
Simulation Technology ◽  
Hole Filling ◽  
Filling Process ◽  
Die Extrusion

In recent years, the application of various simulations in hot extrusion of aluminum alloys has proven useful. However, the most of them are generally applied in the field of steady metal flow conditions with solid die extrusion. In this paper, the simulation technology is applied to hollow die extrusion. Especially, the effects of the taper port-hole shapes on the extrusion pressure-stroke diagrams and the metal flows are investigated experimentally and theoretically. Taper port-hole shapes are useful for the reduction of the extrusion pressure in comparison with straight port-hole shape, because the extrusion pressure in the port-hole filling process is decreased by the reduction of the sliding friction, and the extrusion pressure in the welding chamber filling process is decreased by the reduction of equivalent strain rate in the port-hole and the welding chamber. FEM results by FEM analysis code added with special know-how show a close match with the experimental results. Therefore, we are able to predict the extrusion pressure and the metal flow through the port-hole and the welding chamber by this simulation technology.

scholarly journals Metal Flow Characteristics and Deformation Analyses in Hot Extrusion of Al-Alloy

1995 ◽  
Vol 15 (Supplement2) ◽  
pp. 153-156
Author(s):  
Hiroyuki KINOSHITA ◽  
Kenji NAKANISHI ◽  
Shunpei KAMITANI ◽  
Yong-Ming GUO ◽  
Seigo YONEYAMA
Keyword(s):  
Metal Flow ◽  
Flow Characteristics ◽  
Hot Extrusion ◽  
Al Alloy

scholarly journals Numerical Model Simulation of the Double-Roll Rotary Forging of Large Diameter Thin-Walled Disk

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1767
Author(s):  
Zhongquan Yu ◽  
Mingchao Chen ◽  
Chong Ma ◽  
Site Luo ◽  
Chundong Zhu
Keyword(s):  
Numerical Model ◽  
Model Simulation ◽  
High Surface ◽  
Large Diameter ◽  
Metal Flow ◽  
Deformation Characteristic ◽  
Low Noise ◽  
Forging Process ◽  
Rotary Forging ◽  
Thin Walled

Double-roll rotary forging is an emerging plastic forming technology based on rotary forging. Owing to the advantages of being labor-saving, a small eccentric load, low noise and vibration, good uniformity, high surface quality, and material saving, it is very promising for the fabrication of large diameter thin-walled disks. To date, little relevant research on the double-roll rotary forging technology of large diameter thin-walled metal disks has been reported, and the deformation characteristic and the influence of three key parameters on the double-roll rotary forging process remain uninvestigated. Herein, a reasonable 3D rigid-plastic numerical model of the double-roll rotary forging of a disk workpiece is established under the Deform software environment. Based on the valid 3D numerical model, the deformation mechanism, and the effective laws of three key parameters (feed rate v of the lower die, rotational speed n of the upper die, and the initial temperature T of the disk workpiece) on the metal flow and force and power parameters in the double-roll rotary forging process have been explored. The research results provide valuable guidelines for a better understanding of double-roll rotary forging for the fabrication of large diameter thin-walled disks.

scholarly journals A Design Approach of Porthole Die for Flow Balance in Extrusion of Complex Solid Aluminum Heatsink Profile with Large Variable Wall Thickness

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 553
Author(s):  
Tat-Tai Truong ◽  
Quang-Cherng Hsu ◽  
Van-Canh Tong ◽  
Jinn-Jong Sheu
Keyword(s):  
Wall Thickness ◽  
Metal Flow ◽  
Die Design ◽  
Design Approach ◽  
Thickness Variation ◽  
Extrusion Force ◽  
Bridge Structure ◽  
Flow Balance ◽  
Porthole Die ◽  
Wall Thickness Variation

In this study, porthole die used for extrusion of a solid heatsink profile with wall thickness variation ratio up to 15.3 was designed using finite element (FE) simulations. To improve the flow balance in the die, a design approach was introduced to find the appropriate die structure, which includes the porthole and pocket geometry correction, the bearing length adjustment, and the port bridge structure modification. Using the proposed die, the predicted velocity relative difference (VRD) and the maximum velocity difference (ΔV) of extrudate were significantly lower than those of an initial die, which was preliminarily designed based on general design experiences. The required extrusion force and the residual stress in the product were also reduced significantly. Then, the effects of the port bridge structure and welding chamber height on the behavior of the metal flow in the die were investigated. To verify the proposed die design, experimental extrusions were conducted on a 930-ton extruder. The experiment results showed that the extruded product fulfilled the requirements for dimensional tolerances. The design approach presented in this paper can be useful for practical implementation of die design when extruding similar solid heatsink profiles with large wall thickness variation.

Law of Metal Flow of Thin-Walled Conical Part With Variable Section During Spinning

2020 ◽  
Author(s):  
Shu Xuedao ◽  
Xia Yingxiang ◽  
Zhu Ying ◽  
Li Zixuan ◽  
Ye Bohai
Keyword(s):  
Metal Flow ◽  
Conical Part ◽  
Forming Process ◽  
Finite Element Software ◽  
Axial Tensile ◽  
Variable Section ◽  
Spinning Process ◽  
Thin Walled ◽  
Forming Defects

Abstract During the spinning process of the variable-section thin-walled conical parts, the metal flow law is relatively complicated and the flange is prone to be unstable, which resulting in wrinkling and other defects. In this paper, the variable-section conical part of superalloy GH1140 is taken as the research object. The spinning forming process is numerically simulated by using Simufact Finite Element software and the metal flow in each stage of the forming process is analyzed. The flow velocity shows an annular distribution as a whole. The metal near the center of the circle flows more slowly, and the metal far from the circular flange flows more quickly. In the direction of thickness, the velocity of metal flow decreases gradually. Under the feeding action of the roller, the metal in front of the roller is subjected to axial tensile stress, tangential and radial compressive stress, resulting in a strain state of one-way tension and two-way compression. The metal moves along the negative direction of the rotary wheel feed, resulting in the increase of the sheet wall thickness. The correctness of the model in this paper is further verified by spinning experiments. The research results provide a theoretical basis for analyzing the mechanism of forming defects and improving the quality of spinning forming of conical thin-walled parts with variable sections.

Law of Metal Flow of Thin-Walled Conical Part With Variable Section During Spinning

2021 ◽  
Author(s):  
Xuedao Shu ◽  
Yingxiang Xia ◽  
Ying Zhu ◽  
Zixuan Li ◽  
Bohai Ye
Keyword(s):  
Metal Flow ◽  
Conical Part ◽  
Variable Section ◽  
Thin Walled
Sign in / Sign up

Export Citation Format

Share Document