Implement a Modified Viscoplasticity Based on Overstress Model into Numerical Simulation of the Incremental Sheet Forming Process

2016 ◽  
pp. 23-33
Author(s):  
Le Van Sy ◽  
Pham Thi Minh Hue
Keyword(s):  
Numerical Simulation ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Forming Process

Numerical Prediction of Joule Heating Effect in Electric Hot Incremental Sheet Forming

2021 ◽  
Author(s):  
Zhengfang Li ◽  
Songlin He ◽  
Yuhang Zhang ◽  
Zhiguo An ◽  
Zhengyuan Gao ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Joule Heating ◽  
Thermal Conductance ◽  
Element Model ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Heating Effect ◽  
Forming Process ◽  
Joule Heating Effect ◽  
Force Coupling

Abstract Since the deformation region involves the interaction of electric-thermal-force coupling in electric hot incremental sheet forming, the numerical simulation of the forming process is unusually difficult. Currently, the thermal-force coupling method is adopted to simulate approximately the whole forming process, and the Joule heating effect is often ignored. Therefore, the numerical simulation of Joule heating effect is especially significant for the prediction accuracy of forming process. In this paper, a novel numerical simulation method, considering electric-thermal-force parameters, was proposed to instantly update the thermal-force condition of forming region. Meanwhile, the model of contact thermal conductance was established combining geometrical and electric-thermal parameters, and then a high-precision finite element model was obtained to predict the Joule heating effect of forming region. In addition to this, the effect of thermal superposition on forming temperature was further analyzed and a modified model of contact thermal conductance was established in electric hot incremental sheet forming.

scholarly journals Studying Formability Limits By Combining Conventional and Incremental Sheet Forming Process

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Fabio Andre Lora ◽  
Daniel Fritzen ◽  
Ricardo Alves de Sousa ◽  
Lirio Schaffer
Keyword(s):  
Numerical Simulation ◽  
Deep Drawing ◽  
Sheet Forming ◽  
Measured Data ◽  
Incremental Sheet Forming ◽  
Forming Process ◽  
Strain Evolution ◽  
Strain Paths ◽  
Incremental Process

AbstractIn this work it is assessed the potential of combining conventional and incremental sheet forming processes in a same sheet of metal. This so-called hybrid forming approach is performed through the manufacture of a pre-forming by conventional forming, followed by incremental sheet forming. The main objective is analyzing strain evolution. The pre-forming induced in the conventional forming stage will determine the strain paths, directly influencing the strains produced by the incremental process. To conduct the study, in the conventional processes, strains were imposed in three different ways with distinct true strains. At the incremental stage, the pyramid strategy was adopted with different wall slopes. From the experiments, the true strains and the final geometries were analyzed. Numerical simulation was also employed for the sake of comparison and correlation with the measured data. It could be observed that single-stretch pre-strain was directly proportional to the maximum incremental strains achieved, whereas samples subjected to biaxial pre-strain influenced the formability according to the degree of pre-strain applied. Pre-strain driven by the prior deep-drawing operation did not result, in this particular geometry, in increased formability.

A Mixed Toolpath Strategy for Improved Geometric Accuracy and Higher Throughput in Double-Sided Incremental Forming

2014 ◽  
Author(s):  
Rui Xu ◽  
Huaqing Ren ◽  
Zixuan Zhang ◽  
Rajiv Malhotra ◽  
Jian Cao
Keyword(s):  
Incremental Forming ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Geometric Accuracy ◽  
Recent Past ◽  
Forming Process ◽  
Process Flexibility ◽  
Formed Part ◽  
Future Work

Incremental sheet forming has attracted considerable attention in the recent past due to advantages that include high process flexibility and higher formability as compared to conventional forming processes. However, attaining required geometric accuracy of the formed part is one of the major issues plaguing this process. The Double-Sided Incremental Forming process has emerged as a potential process variant which can preserve the process flexibility while maintaining required geometric accuracy. This paper investigates a mixed toolpath for Double-Sided Incremental Forming which is able to simultaneously achieve good geometric accuracy and higher throughput than is currently possible. The geometries of parts formed using the mixed toolpath strategy are compared to the desired geometry. Furthermore, an examination of the forming forces is used to uncover the reasons for experimentally observed trends. Future work in this area is also discussed.

An approach to eliminate stepped features in multistage incremental sheet forming process: Experimental and FEA analysis

2017 ◽  
Vol 31 (2) ◽  
pp. 599-604 ◽  
Author(s):  
Harish Kumar Nirala ◽  
Prashant K. Jain ◽  
J. J. Roy ◽  
M. K. Samal ◽  
Puneet Tandon
Keyword(s):  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Forming Process ◽  
Fea Analysis

A New Incremental Sheet Forming Process Based on a Flexible Supporting Die System

2007 ◽  
pp. 607-614
Author(s):  
E. Maidagan ◽  
Joachim Zettler ◽  
M. Bambach ◽  
P.P. Rodríguez ◽  
Gerhard Hirt
Keyword(s):  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Forming Process
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