Study on Numerical Simulation of Automobile Covering Parts Stamping Forming Process

2012 ◽  
Vol 271-272 ◽  
pp. 509-514
Author(s):  
Xiao Gang Qiu ◽  
Yue Dong Huang
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Friction Coefficient ◽  
Significant Influence ◽  
Forming Process ◽  
Fem Model ◽  
Material Parameters ◽  
Simulation Calculation ◽  
Analysis And Study

Performing the 3-D numerical modeling of the automobile covering parts by the Pro/E software, creating both addendum and blank holding surfaces, and importing them into the DYNAFORM so that a FEM model can be created. Use the DYNAFORM to perform the simulation calculation and analysis, and study the influences of the factors such as friction coefficient, die clearance and material parameters (n and r values) on the stamping formability. The results show that the parameters such as friction coefficient between die and blank, die clearance and the v value in the material parameters play the key role in the the blank flowability, and have the significant influence on the stamping result.

Numerical Modeling for Sand Desert Morphology and Forming Process in Fixed, Semi-Fixed and Free Desert Field

2008 ◽  
Vol 33-37 ◽  
pp. 1055-1062 ◽  
Author(s):  
Xamxinur Abdikerem ◽  
Zhong Hua Xu ◽  
Mamtimin Gheni
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Numerical Modeling ◽  
Numerical Model ◽  
Flow Field ◽  
Stream Flow ◽  
Forming Process ◽  
Flow Process ◽  
Sand Movement ◽  
Sand Flow

In this study, to conduct numerical simulation of desert physiognomy forming process in fixed, semi-fixed and free sand desert field by considering the sand flow process by wind, the numerical model based on the hydrodynamics and sand grains kinemics are proposed. For analyze the actual characteristic of sand movement phenomenon, the stream flow field and desert flow field are introduced and mathematical model for numerical analysis are established by considering the sand shape, size and mass in order to describe the fixed, semi-fixed and fully free sand desert physiographical process. Then according to the real fixed, semi-fixed and free sand flow field by coupling with stream flow field, several models are made and numerical simulations are conducted.

How to Combine the Parameters of the Yield Criteria and the Hardening Law

2013 ◽  
Vol 554-557 ◽  
pp. 1195-1202 ◽  
Author(s):  
Pedro Prates ◽  
M.C. Oliveira ◽  
Nataliya A. Sakharova ◽  
José Valdemar Fernandes
Keyword(s):  
Numerical Simulation ◽  
Metal Forming ◽  
Forming Process ◽  
Accurate Identification ◽  
Material Parameters ◽  
Hardening Law ◽  
Out Of Plane ◽  
Simulation Results ◽  
The Hill ◽  
Constitutive Parameters

The numerical simulation of sheet metal forming processes needs the accurate identification of the material parameters, for a given constitutive model. This identification can follow different methodologies and different sets of experimental data can be used, which lead to distinct sets of material parameters. In order to accurately compare the results of several methodologies, it is necessary to guarantee uniformity of their presentation. In this work, the correspondence between sets of parameters of the Hill’48 criterion is explored. The meaning of the “isotropic values” of the parameters associated with the out-of-plane stresses components is discussed and a required condition is proposed, in order to properly compare numerical simulation results obtained by using different input sets of constitutive parameters, identified by different procedures. Finite element simulations of complex shaped forming process, involving strain-path changes, are carried out in order to support the analysis.

Numerical Simulation of Multi-Roll Stretch Forming Process with Different Lubrication and Rollers

2011 ◽  
Vol 110-116 ◽  
pp. 1512-1518
Author(s):  
Hao Han Zhang ◽  
Ming Zhe Li ◽  
Wen Zhi Fu ◽  
Peng Xiao Feng
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Friction Coefficient ◽  
Flexible Manufacturing ◽  
General Idea ◽  
Stretch Forming ◽  
Forming Process ◽  
New Process ◽  
Traditional Process ◽  
Stretching Process

Multi-roll stretch forming process is a new flexible manufacturing technique that the general idea of discretizing is put in use in the design of stretch forming machine. In the new process, the metal sheet can be more easily formed, and the flexibility can be much higher, which the traditional process cannot compare with. In this paper, in through extensive numerical simulations of the MRSF stretching process of toroidal saddle parts, A series of finite element simulations have done for the process of forming toroidal saddle parts using different lubricant and two kinds of rollers named damped rollers and ordinary rollers. The results show that the smaller the friction coefficient is, the easier the center of toroidal saddle part is stretched. Damped rollers can increase the stretching force and the ordinary rollers can increase the mobility of sheet metal. Arranging the damped rollers and ordinary rollers at a reasonable position can make the workpiece a more uniform stretching.

Influence Study on Drawbead Setting to Formability of Automobile Sump Based on Numerical Simulation

2010 ◽  
Vol 146-147 ◽  
pp. 883-886
Author(s):  
Hong Wei Wang ◽  
Er Wei Su ◽  
Feng Wang
Keyword(s):  
Numerical Simulation ◽  
Significant Influence ◽  
Line Segment ◽  
Thickness Variation ◽  
Mold Design ◽  
Forming Process ◽  
Forming Quality ◽  
Setting Theory ◽  
Separate Line ◽  
Shallow Part

Drawbead is an important factor to automobile sump forming process, proper drawbead setting can improve the forming quality significantly, such as uniforming the sump thickness. Using the drawbead setting theory in dynaform software, the drawbead on the compressive annular part which lie in the shallow part of sump was set, that is, three separate line segment shape equivalent drawbead were arranged alone the shallow part of the die. The influence law of different drawbead parameters to the sump thickness variation has been simulated. Simulating results show that after setting drawbead, reduction of sump thickness is reduced 15% relative to not setting one, and drawbead setting has significant influence to the sump forming quality. It is helpful for forming mold design.

Friction and Wear in Metal Forming: 25 Years at LAMIH UMR CNRS 8201

2018 ◽  
Vol 767 ◽  
pp. 42-58 ◽  
Author(s):  
Laurent Dubar ◽  
André Dubois ◽  
Mirentxu Dubar
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Friction Coefficient ◽  
Metal Forming ◽  
Friction And Wear ◽  
Forming Process ◽  
Contact Conditions ◽  
Manufacturing Plants ◽  
Bulk Forming ◽  
Research Activities

Since the beginning of the 90’s, research activities focused on friction and wear in metal forming have been developed at the LAMIH UMR CNRS 8201 in Valenciennes. Specific methodologies have been designed to optimize a given forming process (bulk forming process or sheet forming process). These methodologies involve prototype benches which have been built to reproduce contact conditions encountered in manufacturing plants by taking specimens and contactors from the real industrial workpieces and tools. The evaluation of the friction coefficient added to the fine analysis of the surfaces have helped us to better understand friction and wear during processes. These facilities have been settled by numerical simulation at meso and macro scales by means of finite element methods. So, this paper is the sum up of the output of these methodologies with a specific focus on wear and lubrication, at room and hot temperatures.

The Numerical Simulation of Air Bulge Forming of Profiled Can

2010 ◽  
Vol 97-101 ◽  
pp. 2774-2778
Author(s):  
Jie Jin ◽  
Xin He
Keyword(s):  
Numerical Simulation ◽  
Parameter Estimation ◽  
Friction Coefficient ◽  
Process Parameters ◽  
Wall Thickness ◽  
Process Parameter ◽  
The Other ◽  
Technological Parameters ◽  
Forming Process ◽  
Inner Pressure

Air bulge forming is a forming process where an inner pressure deforms the material to the shape of a die cavity. The main concerns about such a process of profiled cans are to avoid wall thickness reduction, wrinkling and bursting. The success of this process strongly depends on the choice of process parameters, i.e. the properties of material, thickness and inner pressure. By transforming the problem into a deformation controlled rather than a force controlled process, the results from the process parameter estimation become more reliable but on the other hand less intuitive. In this context, the influence of materials, friction coefficient, transitional fillet radius, thickness and bulging load are studied and some suited technological parameters and forming rules are obtained. The most important point is that the simulation and results of experiments are probably consistent.

Numerical Simulation of Stamping Forming of Automobile Cover

2010 ◽  
Vol 33 ◽  
pp. 496-501 ◽  
Author(s):  
Hui Min Fang ◽  
Guang Sheng Zhang
Keyword(s):  
Numerical Simulation ◽  
Friction Coefficient ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Forming Process ◽  
Corner Radius ◽  
Metal Forming Process ◽  
Actual Operation ◽  
Main Defect

The main defect of the inner-hood is break, which was obtained by the numerical simulation of it’s forming process. The main impacted parameters of sheet metal forming process are corner radius of die, friction coefficient, clearance between punch and die and the height of drawbead. The maximum impact of the break of forming factors was drawbead high, followed by the die gap, die edge and the friction coefficient which were obtained by the four factors orthogonal optimized simulation. The comparison between the results of numerical simulation and actual operation proved the accuracy of the numerical simulation.

Numerical Modeling of the Effects of Wears on Cutting Loads

2011 ◽  
Vol 308-310 ◽  
pp. 2340-2344 ◽  
Author(s):  
Xiao Yu Wang ◽  
Zong Xi Cai ◽  
Peng Cheng Su ◽  
Hai Feng Zhao ◽  
Yi Lan Kang
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Numerical Simulations ◽  
Penetration Depth ◽  
Normal Force ◽  
Disc Cutter ◽  
Fem Model ◽  
Simulation Results ◽  
Modified Formula ◽  
The Relationship

In order to determine the normal force acting on the TBM disc cutter, a 3-D FEM model is established to simulate the cutting process, with the failure effect of the rock. Afterwards, by using this model, a series of numerical simulations are performed. Based on the numerical simulation results, via modifying Evans formula, an improved formula is given. The modified formula indicates the relationship between the normal force acting on a single disc cutter and the penetration depth, and contains the influence of formation stress and wear.

A Study on the Flow Behavior of 42CrMo Steel under Hot Compression by Thermal Physical Simulations

2010 ◽  
Vol 108-111 ◽  
pp. 494-499
Author(s):  
Ying Tong ◽  
Guo Zheng Quan ◽  
Gang Luo ◽  
Jie Zhou
Keyword(s):  
Strain Rate ◽  
Flow Behavior ◽  
Rate Sensitivity ◽  
Strain Hardening Exponent ◽  
Forming Process ◽  
Material Parameters ◽  
Basic Model ◽  
42Crmo Steel ◽  
Plastic Forming ◽  
Physical Simulations

This work was focused on the compressive deformation behavior of 42CrMo steel at temperatures from 1123K to 1348K and strain rates from 0.01s-1 to 10s-1 on a Gleeble-1500 thermo-simulation machine. The true stress-strain curves tested exhibit peak stresses at small strains, after them the flow stresses decrease monotonically until high strains, showing a dynamic flow softening. And the stress level decreases with increasing deformation temperature and decreasing strain rate. The values of strain hardening exponent n, and the strain rate sensitivity exponent m were calculated the method of multiple linear regression, the results show that the two material parameters are not constants, but changes with temperature and strain rate. Then the two variable material parameters were introduced into Fields-Backofen equation amended. Thus the constitutive mechanical discription of 42CrMo steel which can accurately describe the relationships among flow stress, temperature, strain rate, strain offers the basic model for plastic forming process simulation.

Sign in / Sign up

Export Citation Format

Share Document