Die design by a void index in multi-pass drawing

2002 ◽  
Vol 216 (11) ◽  
pp. 1043-1049 ◽  
Author(s):  
T Kuboki ◽  
H Furuta ◽  
H Yoshikawa ◽  
Y Neishi ◽  
M Akiyama
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Analysis ◽  
Void Fraction ◽  
Void Growth ◽  
Cold Working ◽  
Die Design ◽  
Element Analysis ◽  
Series Of Experiments

Die design was optimized for suppressing the void growth in multi-pass drawing. The void index to evaluate the void fraction in multi-pass drawing was first proposed, based on the well-known equation to predict the fracture limit in cold working. Using finite element analysis, the influence of die geometries on the void index was investigated and dies were designed to have the effect of suppressing void with the least minimum die length. A series of experiments was then carried out to verify the validity of the numerical analysis. The densities of drawn bars were measured and voids in microstructures were observed to verify the validity of the proposed void index.

Design Method of Die Geometry and Pass Schedule by Void Index in Multi-Pass Drawing

2005 ◽  
Vol 127 (1) ◽  
pp. 173-181 ◽  
Author(s):  
Takashi Kuboki ◽  
Masaaki Abe ◽  
Yutaka Neishi ◽  
Masayoshi Akiyama
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cold Working ◽  
Design Method ◽  
Element Analysis ◽  
Die Geometry ◽  
Geometry Design ◽  
Pass Schedule ◽  
Series Of Experiments ◽  
Reduction In Area

The concept for die-geometry design is shown to suppress void growth in multi-pass drawing. First, the void index to evaluate the void fraction in multi-pass drawing was newly proposed based on the well-known equation to predict the fracture limit in cold working. Using finite element analysis, the influence of die geometries on the void index was investigated and it was clarified that the extra-low-angle die is effective whatever reduction in area is adopted. Moreover, dies were designed to have the effect of suppressing void with the minimum die length. A series of experiments was then carried out that successfully verified the numerical results.

Forging Process Analysis of 6061 Aluminum Alloy Motorcycle Brake Parts

2021 ◽  
Vol 901 ◽  
pp. 176-181
Author(s):  
Tung Sheng Yang ◽  
Chieh Chang ◽  
Ting Fu Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Metal Forming ◽  
Process Analysis ◽  
Surface Hardness ◽  
Dimensional Accuracy ◽  
Die Design ◽  
Element Analysis ◽  
Forging Process

This paper used finite element analysis of metal forming to study the forging process and die design of aluminum alloy brake parts. According to the process parameters and die design, the brake parts were forged by experiment. First, the die design is based on the product size and considering parting line, draft angle, forging tolerance, shrinkage and scrap. Secondly, the finite element analysis of metal forming is used to simulate the forging process of aluminum alloy brake parts. Finally, the aluminum alloy brake levers with dimensional accuracy and surface hardness were forged.

scholarly journals A Review on Numerical Analysis of RC Flat Slabs Exposed to Fire

2020 ◽  
Vol 27 (1) ◽  
pp. 1-5
Author(s):  
Hanadi Naji ◽  
Nibras Khalid ◽  
Mutaz Medhlom
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Analysis ◽  
Bending Moment ◽  
Mechanical And Thermal Properties ◽  
Vertical Deflection ◽  
Element Analysis ◽  
Flat Slabs ◽  
Numerical Studies ◽  
The Finite Element Analysis

This paper aims at presenting and discussing the numerical studies performed to estimate the mechanical and thermal behavior of RC flat slabs at elevated temperature and fire. The numerical analysis is carried out using finite element programs by developing models to simulate the performance of the buildings subjected to fire. The mechanical and thermal properties of the materials obtained from the experimental work are involved in the modeling that the outcomes will be more realistic. Many parameters related to fire resistance of the flat slabs have been studied and the finite element analysis results reveal that the width and thickness of the slab, the temperature gradient, the fire direction, the exposure duration and the thermal restraint are important factors that influence the vertical deflection, bending moment and force membrane of the flat slabs exposed to fire. However, the validation of the models is verified by comparing their results to the available experimental date. The finite element modeling contributes in saving cost and time consumed by experiments.

Two-Dimensional Finite Element Analysis of Laboratory Seawall Model

2014 ◽  
Vol 580-583 ◽  
pp. 2134-2140
Author(s):  
Jian Zhang ◽  
Jian Feng Zhai ◽  
Xian Mei Wang ◽  
Jie Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Analysis ◽  
Numerical Results ◽  
Experimental Results ◽  
Base Layer ◽  
Two Dimensional ◽  
Element Analysis ◽  
Cemented Sand ◽  
Dimensional Finite Element

Two-Dimensional finite element analysis was used to investigate the performance of seawall construction over weak subgrade soil using artificial base layer material consisted of cemented sand cushion comprising geosynthetics materials. Two types of base layer materials pure sand and cemented sand comprising husk rich ash and two types of geosynthetics materials geogrid and geotextile were used. Constitutive models were used to represent different materials in numerical analysis. The competence of two-dimensional numerical analysis was compared with experimental results. Numerical results showed a superior harmony with the experimental results. Finite element analysis model proved to be a great tool to determine the parameters that are difficult to measure in laboratory experiments. In addition, finite element analysis has the benefit of cost and time saving when compared to experimental investigation work. Numerical results showed strain induced in geosynthetics eliminated beyond a distance approximately equal six times of footing width.

Sheet Metals Forming Die Design Using Finite Element Analysis and the Taguchi Method

2014 ◽  
Vol 621 ◽  
pp. 195-201
Author(s):  
Surangsee Dechjarern ◽  
Maitri Kamonrattanapisut
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Friction Coefficient ◽  
Taguchi Method ◽  
Finite Element Model ◽  
Sheet Metal ◽  
Element Model ◽  
Die Design ◽  
Forming Process ◽  
Element Analysis

Sheet metal deep-draw die is primarily constructed with draw bead, which is then modified based on trial and error to obtain a successful forming without splitting. This work aims at a robust design of forming die using numerical analysis and the Taguchi method. A three dimensional elastoplastic finite element model of a sheet metal forming process of SPCEN steel has been successfully developed using the material flow stress obtained from the modified Erichsen cup test. The model was validated with the actual forming experiment and the results agreed well. The influence of draw bead parameters on splitting and thinning distributions were examined using the Taguchi method. Four parameters, namely the friction coefficient, draw bead height, radius and shoulder radius were investigated. The Taguchi main effect analysis and ANOVA results show that the height and shoulder radius of the draw bead are the most important factor influencing the thinning distribution. Applying the Taguchi method and using the minimum thinning percentage as the design criteria, the optimum die design was identified as height, radius, shoulder radius and the friction coefficient of 4, 8, 8 mm and 0.125 respectively. The verified finite element model using the optimum die design was conducted. The predicted Taguchi response was within 5.9% from finite element analysis prediction. The improvement in the reduction of thinning percentage was 22.35%.

Micro-Drawing of Circular Cups with Thin Stainless Steel Sheets

2018 ◽  
Vol 920 ◽  
pp. 114-119
Author(s):  
Hong Syuan Su ◽  
Fuh Kuo Chen ◽  
Kun Min Huang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Die Design ◽  
Stress Strain ◽  
Element Analysis ◽  
Steel Sheets ◽  
Grain Sizes ◽  
Multi Stage ◽  
The Finite Element Analysis ◽  
Tooling Design

With the ongoing development of product process, there is a growing demand on micro products. Though the macro-drawing process has been well-developed, the design concepts may not be directly applicable to the micro-drawing due to the size effect occurred in the micro-forming processes. In the present study, experiments were conducted first to establish the stress-strain curves, r-values and work hardening exponents of 304 stainless steel sheets with different grain sizes. The experiment results reveal that the stress-strain and r-value become smaller and the work hardening exponent increases for larger grain sizes. The difference between stress-strain curves in various directions of 0°, 45° and 90°, respectively, is significant when the grain size increases. The stamping of a vibration motor shell of cell phone, which bears a circular cylindrical shape, was also examined in the present study. The finite element simulations were performed to evaluate the formability of the multi-stage drawing process with initial die design. The forming characteristics were identified and an optimum die design was then developed with the use of the finite element analysis. The stamping process with multi-stage tooling design based on the finite element analysis was implemented and the actual stamping experiments were conducted to verify finite element analysis. The experimental results confirm the validity of the modified tooling design and the efficiency of the finite element analysis.

The Improvement and Finite Element Analysis of Large Crankshaft Forging Process

2013 ◽  
Vol 365-366 ◽  
pp. 561-564
Author(s):  
Jian Jun Wang ◽  
Su Lan Hao ◽  
Lu Pan ◽  
Yan Ming Zhang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Simulation Software ◽  
Die Design ◽  
Element Analysis ◽  
Forging Process ◽  
Large Load ◽  
Deform 3D

In view of large load, the shape of large crank forgings and forging process are designed reasonably. Large crank forging process is simulated by numerical simulation software DEFORM-3D to improve the forging process and the dies, including adding upsetting step and related dies. The result shows that improved process and dies can obtain higher quality finish forgings and the load reduces to a rational level, which provides basis for crank forging process and die design.

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