Development of an index model for oil canning of steel sheet metal forming products

2018 ◽  
Vol 97 (5-8) ◽  
pp. 3023-3037
Author(s):  
Honglae Kim ◽  
Salman Al-Saeedi ◽  
Changsoon Jang ◽  
Luca Quagliato ◽  
Naksoo Kim
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Steel Sheet ◽  
Index Model ◽  
Oil Canning

scholarly journals Development of oil canning index model for sheet metal forming products with large curvature

2017 ◽  
Vol 896 ◽  
pp. 012064 ◽  
Author(s):  
Honglae Kim ◽  
Seonggi Lee ◽  
Mohanraj Murugesan ◽  
Seokmoo Hong ◽  
Shanghun Lee ◽  
...  
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Large Curvature ◽  
Index Model ◽  
Oil Canning

The Effect of Anisotropy on Spring-Back of CK67 Steel Sheet in L-Dies Bending Processes

2011 ◽  
Vol 291-294 ◽  
pp. 672-675
Author(s):  
Jafar Bazrafshan ◽  
A. Gorji ◽  
A. Taghizadeh Armaky
Keyword(s):  
Numerical Simulations ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Steel Sheet ◽  
Elastic Recovery ◽  
Sheet Thickness ◽  
Bend Angle ◽  
Spring Back ◽  
Geometric Changes

One of the most sensitive features of sheet metal forming processes is the elastic recovery during unloading, called spring-back, which leads to some geometric changes in the product. This phenomenon will affect bend angle and bend curvature, and can be influenced by various factors. In this research, the effects of sheet thickness and die radiuses an sheet anisotropy on spring-back in L-die bending of CK67 steel sheet were studied by experiments and numerical simulations.

Effect of the Constitutive Laws on the Accuracy of Sheet Metal Simulation

2013 ◽  
Vol 535-536 ◽  
pp. 279-283
Author(s):  
Dorel Banabic
Keyword(s):  
Numerical Simulation ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Constitutive Modeling ◽  
Metal Forming ◽  
Steel Sheet ◽  
Plastic Anisotropy ◽  
Advanced Materials ◽  
Sheet Metals ◽  
Simulation Tools

During the last three decades, numerical simulation has gradually extended its applicability in the field of sheet metal forming. Constitutive modeling is one of the domains closely related to the development of numerical simulation tools. The paper is devoted to a comprehensive testing of the advanced materials models as implemented in the finite-element code. The test proves the capability of the advanced materials models response of DC04 steel sheet to describe the effects of the plastic anisotropy of the sheet metals subjected to industrial forming processes.

A STUDY ON THE IMPROVEMENT OF THE ACCURACY OF A SHAVING PROCESS USING A PROGRESSIVE DIE

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5673-5679 ◽  
Author(s):  
WAN-JIN CHUNG ◽  
KU-BOK HWANG ◽  
JONG-HO KIM ◽  
HO-YEUN RYU
Keyword(s):  
Sheet Metal ◽  
Working Conditions ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Steel Sheet ◽  
Rolled Steel ◽  
Progressive Die ◽  
Cold Rolled Steel ◽  
Increase Productivity ◽  
Cold Rolled

Shaving is widely used as a finish process to generate a smooth sheared surface from a sheared surface originally obtained by blanking or piercing. In the sheet metal forming industry, progressive operations are commonly used to increase productivity. However, it is difficult to utilize shaving in a progressive die because a blank is dropped down after blanking. In this study, a method that addresses this issue is introduced, and the two-stage progressive operation of half-blanking and blank-shaving is suggested. For this study, a square part made by blanking and piercing is considered, and a progressive die that includes piercing, pierce-shaving, half-blanking and blank-shaving is prepared for a specimen of cold rolled steel sheet. Experiments are carried out involving the process parameters of the shaving allowance, shaving clearance and the half-blanking penetration depth. It was found that the proposed method using a progressive die offers a completely smooth sheared surface along with feasible working conditions for a cold rolled steel sheet with a thickness of 1.56 mm.

Frictional mechanisms in mixed lubricated regime in steel sheet metal forming

Wear ◽  
2008 ◽  
Vol 264 (5-6) ◽  
pp. 474-479 ◽  
Author(s):  
Daniel Wiklund ◽  
Bengt-Göran Rosén ◽  
Lars Gunnarsson
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Steel Sheet

Rate-Dependent Material Parameters of the Combined Isotropic/Kinematic Hardening Model for the TRIP980 Steel Sheet

2016 ◽  
Vol 725 ◽  
pp. 132-137
Author(s):  
Geun Su Joo ◽  
Hoon Huh
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Steel Sheet ◽  
Kinematic Hardening ◽  
Strain Rates ◽  
Rate Condition ◽  
Hardening Model ◽  
Material Parameters ◽  
Rate Dependent

This paper is concerned with rate-dependent hardening behaviors of the TRIP980 steel sheet. In sheet metal forming, sheet metals experiences complicated loading at various strain rates. In order to predict deformed shape in sheet metal forming, accurate material properties and an appropriate constitutive model in numerical simulation are important to consider reverse loading and various strain rates simultaneously.This paper deals with rate-dependent material parameters of the isotropic/kinematic hardening model. Tension/compression tests of the TRIP980 steel sheet are performed with a newly developed experimental technique at various strain rates ranging from 0.001 to 100 s−1. Tension/compression hardening curves of the TRIP980 steel sheet are approximated by the Chun et al model at each strain rate condition respectively. From acquired material parameters, rate dependencies of tension/compression hardening behaviors are investigated.

The Study of Parameters on CK67 Steel Sheet Spring-Back in L-Dies Bending Processes

2011 ◽  
Vol 189-193 ◽  
pp. 2788-2791
Author(s):  
J. Bazrafshan ◽  
A. Gorji ◽  
A. Taghizadeh Armaky ◽  
J. Sadeghi
Keyword(s):  
Numerical Simulations ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Steel Sheet ◽  
Elastic Recovery ◽  
Sheet Thickness ◽  
Bend Angle ◽  
Spring Back ◽  
Geometric Changes

One of the most sensitive features of sheet metal forming processes is the elastic recovery during unloading, called spring-back, which leads to some geometric changes in the product. This phenomenon will affect bend angle and bend curvature, and can be influenced by various factors. In this research, the effects of sheet thickness and die radiuses on spring-back in L-die bending of CK67 and St 14 steel sheet were studied by experiments and numerical simulations.

ИССЛЕДОВАНИЕ ТОЧНОСТИ ДЕТАЛЕЙ, ПОЛУЧАЕМЫХ ПРИ РАЗДЕЛИТЕЛЬНЫХ ОПЕРАЦИЯХ В ПЕРЕНАЛАЖИВАЕМЫХ ШТАМПАХ

2018 ◽  
pp. 52-63
Author(s):  
Е. А. Фролов ◽  
В. В. Агарков ◽  
С. И. Кравченко ◽  
С. Г. Ясько
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Balance Method ◽  
Experiment Planning ◽  
Practical Recommendations

To determine the accuracy of the readjustable punches for separating operations (perforation + punching out) of sheet-metal forming, the accuracy parameters were analyzed using the random balance method using the method of experiment planning. Analytical dependencies are obtained to determine the values of deviation of the outer and inner contour dimensions of perforated and punched out sheet parts. From the dependencies obtained, it is possible to estimate and predict the value of deviation in the dimensions of the resulting part at any time during the operation of the punch. Practical recommendations on the calculation of the actuating dimensions of the working elements (stamping punch, matrix) of readjustable punches are offered.

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