Influence of Friction on Springback of Quadrangle Parts Bending

2011 ◽  
Vol 217-218 ◽  
pp. 619-624
Author(s):  
Chun Jian Su ◽  
Guang Heng Zhang ◽  
Su Min Guo ◽  
Li Gao ◽  
Rui Ma
Keyword(s):  
Numerical Simulation ◽  
Friction Coefficient ◽  
Sheet Metal ◽  
Analytical Model ◽  
Elastic Deformation ◽  
Approximate Calculation ◽  
Plane Deformation ◽  
Theoretical Formula ◽  
Simulation And Experiment ◽  
Springback Angle

Springback is the prominent problem in bending forming of sheet metal, which is difficult to control accurately, especially for the complex shaped bending parts. The change of friction conditions will cause significant changes of bending springback amount. The theoretical analytical model of quadrangle parts bending, which takes into account of the harden ability, anisotropy and elastic deformation of material, is proposed in this paper based on the plane deformation assumption and the bending theory of sheet metal, the quadrangle parts bending of wide sheet is analyzed theoretically, the approximate calculation relational expression is derived between friction coefficient and springback angle, and the influence of friction on springback is discussed. In the same conditions, the springback result deduced from theoretical formula is basically consistent with numerical simulation and experiment result.

Influence of Blank-Holder Force on Springback of Cap-Shape Parts Bending

2012 ◽  
Vol 538-541 ◽  
pp. 1705-1710
Author(s):  
Chun Jian Su ◽  
Shuang Shuang Miao ◽  
Lin Jing Xiao ◽  
Su Min Guo ◽  
Li Gao
Keyword(s):  
Numerical Simulation ◽  
Sheet Metal ◽  
Elastic Deformation ◽  
Approximate Calculation ◽  
Plane Deformation ◽  
Theoretical Formula ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Simulation And Experiment ◽  
Springback Angle

Springback is the prominent problem in bending forming of sheet metal, which is difficult to control accurately, especially for the complex shaped bending parts. The change of blank-holder force will cause significant changes of bending springback amount. The theoretical analytical model of cap-shape parts bending, which takes into account of the harden ability, anisotropy and elastic deformation of material, is proposed in this paper based on the plane deformation assumption and the bending theory of sheet metal, the cap-shape parts bending of wide sheet is analyzed theoretically, the approximate calculation relational expression is derived between the blank-holder force and springback angle, and the influence of blank-holder force on springback is discussed. In the same conditions, the springback result deduced from theoretical formula is basically consistent with numerical simulation and experiment result.

scholarly journals The Computation and Measurement of Residual Stresses in Laser Deposited Layers

2003 ◽  
Vol 125 (3) ◽  
pp. 302-308 ◽  
Author(s):  
S. Finnie ◽  
W. Cheng ◽  
I. Finnie ◽  
J. M. Drezet ◽  
M. Gremaud
Keyword(s):  
Numerical Simulation ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Metal Forming ◽  
Steel Substrate ◽  
Plane Deformation ◽  
Compressive Stresses ◽  
Out Of Plane ◽  
Simulation And Experiment ◽  
Melted Material

Laser metal forming is an attractive process for rapid prototyping or the rebuilding of worn parts. However, large tensile stress may arise in layers deposited by laser melting of powder. A potential solution is to preheat the substrate before and during deposition of layers to introduce sufficient contraction during cooling in the substrate to modify the residual stress distribution in the deposited layers. To demonstrate the value of this approach, specimens were prepared by depositing stellite F on a stainless steel substrate with and without preheating. Residual stresses were computed by numerical simulation and measured using the crack compliance method. For non-preheated specimens simulation and experiment agreed well and showed that extremely high residual tensile stresses were present in the laser melted material. By contrast, pre-heated specimens show high compressive stresses in the clad material. However, in this case the numerical simulation and experimental measurement showed very different stress distribution. This is attributed to out of plane deformation due to the high compressive stresses which are not permitted in the numerical simulation. A “strength of materials” analysis of the effect of out of plane deformation was used to correct the simulation, Agreement with experimental results was then satisfactory.

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 Simulation and Experiment of Aluminum Sheet Metal Springback in New Quenching State

2010 ◽  
Vol 97-101 ◽  
pp. 2567-2570
Author(s):  
Lei Chen
Keyword(s):  
Numerical Simulation ◽  
Tensile Strength ◽  
Numerical Method ◽  
Sheet Metal ◽  
Total Elongation ◽  
Forming Process ◽  
Tool Shape ◽  
Metal Rubber ◽  
Rubber Forming ◽  
Simulation And Experiment

2024-T3 aluminium sheet metal rubber forming process after quenching is studied. The tensile properties of 2024-T3 after quenching are measured. It is found that the yield strength and ultimate tensile strength are reduced, whilst total elongation value is increased. Springback character of rubber forming is studied by numerical method and springback compensation of rib flanging is studied. The simulation is compared with experiment. It is found that the tool shape considering springback is got using numerical method. The parts after springback achieve the design accuracy. So the method can be used in the application of rubber net forming.

Influence of Relative Clearance to Hole Quality in Punching Process

2014 ◽  
Vol 1004-1005 ◽  
pp. 1365-1368 ◽  
Author(s):  
Kai Zhang ◽  
Qiang Wang ◽  
Zhong Ding
Keyword(s):  
Numerical Simulation ◽  
Experimental Investigation ◽  
Sheet Metal ◽  
Cross Section ◽  
Hole Quality ◽  
Simulation And Experiment ◽  
The Difference ◽  
Punching Process

Influence of relative clearance to hole quality is investigated by numerical simulation and experiment. The numerical simulation in punching process of sheet metal is conducted by using ANSYS/LS-DYNA.The relative clearances in two sizes are selected to investigate the difference of holes cross section. Influence regularity of the relative clearance to hole quality is obtained by experimental investigation.

Simulated Analysis of Flow and Deformation in Trilateral Constrained and Asymmetric Square Cup Deep-Drawing

2011 ◽  
Vol 199-200 ◽  
pp. 1901-1905
Author(s):  
Li Cheng Huang ◽  
Xiao Ting Xiao ◽  
Li Guang Tan ◽  
Guo Liang Li
Keyword(s):  
Numerical Simulation ◽  
Stainless Steel ◽  
Friction Coefficient ◽  
Sheet Metal ◽  
Deep Drawing ◽  
Sheet Metal Part ◽  
Metal Part ◽  
Forming Quality ◽  
Simulated Analysis

To satisfy the local forming need of sheet-metal part, numerical simulation of SUS304 stainless steel deep-drawing with trilateral constrained slot were carried out by employing the analytical software ETA/dynaform5.5. The influence of different friction coefficient and holder force on the forming quality was analyzed by taking the inflow volume while parts forming 50mm as standard. The results show that the effect of trilateral constraint on the uneven flow and deformation of flange. And some measures were illustrated to improve the quality of some of these parts.

The study of the elastic deformation of a flexible wheel by a cam wave generator

2020 ◽  
Vol 65 (1) ◽  
pp. 51-58
Author(s):  
Sava Ianici
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Elastic Deformation ◽  
Theoretical Study ◽  
Elastic Field ◽  
The Finite Element Method ◽  
Elastic Deformations ◽  
Wave Generator ◽  
Two Stages

The paper presents the results of research on the study of the elastic deformation of a flexible wheel from a double harmonic transmission, under the action of a cam wave generator. Knowing exactly how the flexible wheel is deformed is important in correctly establishing the geometric parameters of the wheels teeth, allowing a better understanding and appreciation of the specific conditions of harmonic gearings in the two stages of the transmission. The veracity of the results of this theoretical study on the calculation of elastic deformations and displacements of points located on the average fiber of the flexible wheel was subsequently verified and confirmed by numerical simulation of the flexible wheel, in the elastic field, using the finite element method from SolidWorks Simulation.

Sign in / Sign up

Export Citation Format

Share Document