Asymmetric-Shaped Bending of Adhesively Bonded Sheet Metals

2016 ◽  
Vol 725 ◽  
pp. 630-635 ◽  
Author(s):  
Taro Tokuda ◽  
Takeshi Uemori ◽  
Tetsuya Yoshida ◽  
Michihiro Takiguchi ◽  
Fusahito Yoshida
Keyword(s):  
Sheet Metal ◽  
Final Stage ◽  
Fem Analysis ◽  
Sheet Metals ◽  
Analysis Method ◽  
Adhesively Bonded ◽  
Forming Process ◽  
Maximum Shear Strain ◽  
The Press ◽  
A New Technique

In sheet metal industries, press-formed sheet elements are usually adhesively bonded together at the final stage of assembly. Instead of such a conventional process, the present authors proposed a new technique that first flat sheets are adhesively bonded together and then press-formed into the final products. In previous study, the problem of the die-bending (V-bending and hat-shaped bending) with symmetrical shape has studied. In this study, asymmetric-shaped bending of adhesively bonded sheet metals was investigated by experiments and FEM analysis method. In the case of asymmetric-shaped bending, it was found that the timing of contact from the die corner to the die hypotenuse is early in the press-forming process compared with symmetrical bending (V-bending and hat-shaped bending). For the FEM analysis results, the maximum shear strain in asymmetric-shaped bending was smaller than that in symmetric-shaped bending at the hat-shaped side. Thus, the shape of the die has a large influence on the die-bending of adhesively bonded sheet metals.

Bending Deformation Analysis in the Basic Forms of Axisymmetric Sheet Metal Forming

2011 ◽  
Vol 268-270 ◽  
pp. 360-365
Author(s):  
Si Ji Qin
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Symmetry Plane ◽  
Deformation Analysis ◽  
Analysis Method ◽  
Forming Process ◽  
Bending Analysis ◽  
Small Width ◽  
Hole Flanging

In basic sheet metal forming process such as cylindrical deep drawing, bulging, hole flanging (or reaming), etc., deformations in-plane can be considered as changes of the curvature of different microrings. The deformation of each microring is equivalent to a bending process of plate with small width. The differential balance equation of the deformation region can be expressed as simple form of unification. The deformations in the symmetry plane of the sheet metal are part of bending and reverse bending, so the bending analysis method can be used to analyze operation. Some results were obtained by the bending analysis method.

Progressive and Compound Forming for Producing Plunger-Typed Microparts by Using Sheet Metal

2020 ◽  
Vol 8 (2) ◽  
Author(s):  
Jun-Yuan Zheng ◽  
Ming-Wang Fu
Keyword(s):  
Grain Size ◽  
Size Effect ◽  
Sheet Metal ◽  
Mass Production ◽  
Grain Size Effect ◽  
Sheet Metals ◽  
Forming Process ◽  
Deformation Behaviors ◽  
Progressive Forming ◽  
Insight Into

Abstract The plunger part in temporary electronic connectors is traditionally fabricated by micromachining. Progressive forming of microparts by directly using sheet metals is developed and proven to be an efficient microforming process to overcome some intrinsic drawback in realization of mass production of microparts. By employing this unique micromanufacturing process, an efficient approach with progressive microforming is developed to fabricate plunger-shaped microparts. In this endeavor, a progressive forming system for making microplungers using extrusion and blanking operations is developed, and the grain size effect affected deformation behaviors and of surface qualities of the microformed parts are studied. The knowledge for fabrication of plunger-shaped microparts via progressive microforming is developed, and the in-depth understanding and insight into the deformation behaviors and tailoring the product quality and properties will facilitate the design and development of the forming process by using this unique microforming approach.

Numerical Simulation for the Multi-Point Incremental Forming Process

2015 ◽  
Vol 775 ◽  
pp. 219-223
Author(s):  
Wan Mian Yang ◽  
Yuan Xin Luo ◽  
Zhi Fang Liu ◽  
Ru Xu Du
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Model ◽  
Sheet Metal ◽  
Incremental Forming ◽  
Element Model ◽  
Sheet Metals ◽  
Forming Force ◽  
Forming Process ◽  
Thickness Change

Multi-point forming process has been developed to shape the sheet metal with bidirectional curvature. However, the forming force usually climbs too high so that the dimension of the forming machine should be designed to meet it. To solve this problem, the multi-point incremental forming (MPIF) process was proposed in this paper. First, the principle of this new forming process was introduced. Then, the experimental device was designed. Next, the MPIF process was simulated by a finite element model. The forming effects including displacements, thickness, and curvatures were visualized and discussed in detail. It was found that there is no obvious thickness change during the forming process. The advantage of this forming process is that the shape of the sheet metals adaptable and controllable with small forming force.

FEM Analysis of Sheet Incremental Forming Process

2014 ◽  
Vol 571-572 ◽  
pp. 1079-1082
Author(s):  
Jie Liu
Keyword(s):  
Sheet Metal ◽  
Incremental Forming ◽  
Metal Layer ◽  
Three Dimensional ◽  
Rapid Prototype ◽  
Fem Analysis ◽  
Layer By Layer ◽  
Forming Process ◽  
Rapid Prototype Technology ◽  
Forming Technology

Sheet incremental forming is a new sheet metal dieless forming technology. This paper introduced the fundamentals of the sheet incremental forming process. Based on the principle of “layered manufacture” in rapid prototype technology, this process resolves the intricate three-dimensional geometry information of the workpiece into a series of two-dimensional data, which can be used by an NC system to control a forming tool to make a curvilinear movement over the raw sheet metal layer by layer until the component wanted is formed. This paper introduced the sheet incremental forming system and metal digital forming technology. An FEM model of the incremental forming process is established, and a typical process is analyzed to instruct the parameters selection and the optimization of the forming tracks.

Investigation of the Anisotropic Strain Rate Dependency of AA5182-O and DC04 for Different Stress States

2016 ◽  
Vol 1140 ◽  
pp. 35-42 ◽  
Author(s):  
Matthias Lenzen ◽  
Emanuela Affronti ◽  
Martin Rosenschon ◽  
Marion Merklein
Keyword(s):  
Strain Rate ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Equivalent Stress ◽  
Sheet Metals ◽  
Forming Process ◽  
Rate Dependent ◽  
Material Characteristics ◽  
Deformation Velocity

A more precise numerical simulation of sheet metal forming processes leads to a demand for more detailed material characterisation. Hence, it is advisable to consider the strain rate reliant and anisotropic material characteristics. There are various common sheet metals that have beside of an anisotropic a more or less distinct strain rate dependent material behaviour. With regard to these material characteristics, for a more detailed numerical prediction of a sheet metal forming process, it is necessary to include the aspect of deformation velocity. A characterisation of the strain rate dependent hardening behaviour for the two common sheet metals DC04 and AA5182-O is performed under tensile as well as shear load and their behaviour is compared after v. Mises equivalent stress and strain. The two strain rate models from Norton-Hoff and Tanimura are calibrated on basis of the experimental data and their applicability for the investigated materials is evaluated. The calibration of the strain rate sensitive models showed for both materials a very good comparability, respectively.

Numerical Simulation of Sheet Deforming Caused by Laser Shocking

2004 ◽  
Vol 471-472 ◽  
pp. 860-864 ◽  
Author(s):  
Jian Zhong Zhou ◽  
Yong Kang Zhang ◽  
Dun Wen Zuo ◽  
Chao Jun Yang ◽  
Lan Cai
Keyword(s):  
Numerical Simulation ◽  
Sheet Metal ◽  
Simulation Method ◽  
Laser Shock ◽  
Forming Process ◽  
Laser Shock Forming ◽  
Simulation Results ◽  
A New Technique ◽  
Sheet Deformation ◽  
Abaqus Software

Laser shock forming (LSF) is a new technique realized by applying a compressive shock wave generated by laser shocking on the surface of sheet metal. It is a mechanical, not a thermal process. After briefly reviewing the mechanism of LSF, instead of previously reported experimental research, a numerical simulation method of sheet deforming caused by laser shock waves is presented. The process of laser-shock plastic deforming of sheet metal is simulated with ABAQUS software, the simulation results are compared and agree well with the experiments on the condition of single laser shocking. It is shown that numerical simulation is available for optimizing laser parameters and predicting the sheet deformation contour of laser shock forming process.

scholarly journals A Review of Progressive and Compound Forming of Bulk Microparts by Using Sheet Metals

2018 ◽  
Vol 190 ◽  
pp. 01001 ◽  
Author(s):  
M.W. Fu ◽  
J.Y. Zheng ◽  
B. Meng
Keyword(s):  
Size Effect ◽  
Sheet Metal ◽  
Material Flow ◽  
Dimensional Accuracy ◽  
Promising Method ◽  
Sheet Metals ◽  
Forming Process ◽  
Geometrical Feature

In the last decade, the concept of progressive microforming has emerged and developed gradually, which is considered as an efficient and promising method to fabricate the micro-scaled part. Micro-cylinder parts, micro-flanged part, and multi-flanged microparts are representative micro bulk parts by the progressive microforming system using sheet metal. In these cases, many efforts focus on the forming process, such as microblanking and microextrusion. Meanwhile, the quality of the fabricated parts also attracts attention. In this paper, an intensive review on the development of progressive microforming technologies and the formed parts is presented, and the influence of size effect to dimensional accuracy, material flow, geometrical feature, and fracture is also discussed.

Further Development of Sheet Metal Forming Analysis Method

1987 ◽  
Vol 109 (4) ◽  
pp. 330-337 ◽  
Author(s):  
S. A. Majlessi ◽  
D. Lee
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Numerical Procedure ◽  
Type Model ◽  
Analysis Method ◽  
Forming Process ◽  
Element Analysis ◽  
Metal Forming Process ◽  
Time Required

The finite element analysis procedure used to model the sheet metal forming process is further developed by incorporating a refined numerical procedure and an improved metal-tool friction analysis method. The shell-type model is capable of closely approximating the strain distribution of prescribed axisymmetric parts. Further refinements on the numerical procedure have resulted in the marked decrease of the time required to reach a convergence of solutions. At the same time, frictional conditions at the metal-die and metal-punch interfaces have been closely characterized by applying equilibrium conditions in an iterative manner. Effects of these improved procedures have been examined in detail by making a systematic sensitivity analysis and by comparing the analytical results against experimental data. Based on these results, a critical assessment of the simplified analysis method is made.

An Analytical Study on Laser Forming Process of Sheet Metals, Using New Elasto-Plastic Temperature Dependent Material Model

2012 ◽  
Vol 622-623 ◽  
pp. 569-574 ◽  
Author(s):  
Shams Torabnia ◽  
Afshin Banazadeh
Keyword(s):  
Laser Beam ◽  
Sheet Metal ◽  
Analytical Model ◽  
Plastic Material ◽  
Material Model ◽  
Laser Forming ◽  
Sheet Metals ◽  
Temperature Dependent ◽  
Forming Process ◽  
Heated Zone

The laser forming process is one of the last technologies on forming of sheet metals with laser beam heat distribution. In this process laser beam moves across the top surface of the sheet metal and the heated zone expands and causes a great moment that deforms the sheet metal. Subsequently, the heated zone gets cooled and provides a reverse strain and moment. The final bending angle is a combination of two phases. Due to the complexity of the process, it is studied with different approaches; FEM analysis and analytical as well as empirical methods. The laser forming is a sensible process regarding the material properties. Also, because of the temperature change during the process, it is important to use a temperature dependent model. In this study The FEM model is proposed for simulation of the mechanism. Based on the simulation results, an integrated analytical model is then developed by a new elasto-plastic material model considering linear strain hardening, combined with the temperature dependent mechanical and physical properties. In addition, the temperature dependent tangential modulus is used instead of the yield point of the material to improve accuracy in the plastic deformation phase. Finally, the analytical model is compared with the FEM standard code, which showed a great conformity.

scholarly journals Comparison of Computer Extended Descriptive Geometry (CeDG) with CAD in the Modeling of Sheet Metal Patterns

Symmetry ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 685
Author(s):  
Manuel Prado-Velasco ◽  
Rafael Ortiz-Marín
Keyword(s):  
Sheet Metal ◽  
Computer Aided Design ◽  
Parametric Modeling ◽  
Descriptive Geometry ◽  
The Novel ◽  
Forming Process ◽  
Solid Models ◽  
Design Software ◽  
Solid Edge ◽  
Aided Design

The emergence of computer-aided design (CAD) has propelled the evolution of the sheet metal engineering field. Sheet metal design software tools include parameters associated to the part’s forming process during the pattern drawing calculation. Current methods avoid the calculation of a first pattern drawing of the flattened part’s neutral surface, independent of the forming process, leading to several methodological limitations. The study evaluates the reliability of the Computer Extended Descriptive Geometry (CeDG) approach to surpass those limitations. Three study cases that cover a significative range of sheet metal systems are defined and the associated solid models and patterns’ drawings are computed through Geogebra-based CeDG and two selected CAD tools (Solid Edge 2020, LogiTRACE v14), with the aim of comparing their reliability and accuracy. Our results pointed to several methodological lacks in LogiTRACE and Solid Edge that prevented to solve properly several study cases. In opposition, the novel CeDG approach for the computer parametric modeling of 3D geometric systems overcame those limitations so that all models could be built and flattened with accuracy and without methodological limitations. As additional conclusion, the success of CeDG suggests the necessity to recover the relevance of descriptive geometry as a key core in graphic engineering.

Sign in / Sign up

Export Citation Format

Share Document