Comparative Study for Springback Prediction on Single Point Incremental Forming Process

2014 ◽  
Vol 622-623 ◽  
pp. 375-381
Author(s):  
Valentin Oleksik ◽  
Adrian Pascu ◽  
Ioan Bondrea ◽  
Eugen Avrigean ◽  
Liviu Rosca
Keyword(s):  
Comparative Study ◽  
Incremental Forming ◽  
Single Point ◽  
Single Point Incremental Forming ◽  
Forming Process ◽  
Machined Surface ◽  
Fully Integrated ◽  
Explicit Dynamic ◽  
Springback Prediction

The present paper proposes a comparative study in order to determine the springback in single point incremental forming process. Using the Ls-Dyna software the process was simulated for one piece in frustum of pyramid shape. In the end of the explicit dynamic analysis, it was run, using the same software, an implicit analysis to determine the springback. For this comparison study we selected four different shell formulations. The results obtained in this simulation were compared with those obtained experimentally for the same part. The experimental research was conducted on a robot and, on the opposite side of the machined surface, an Aramis measuring optical system was placed to allow the online determination of deformations, displacements and thinning of material. Also, using this system, the springback was determined at the end of forming process. The closest values were obtained when using fully integrated formulation with thickness-stretch with 11 integration points on material thickness.

scholarly journals Simulation of the Single Point Incremental Forming of Polyamide and Polyethylene Sheets

2019 ◽  
Vol 290 ◽  
pp. 03014
Author(s):  
Nicolae Alexandru Roşca ◽  
Mihaela Oleksik
Keyword(s):  
Incremental Forming ◽  
True Strain ◽  
Single Point ◽  
Polymeric Materials ◽  
Single Point Incremental Forming ◽  
Forming Process ◽  
Explicit Analysis ◽  
Polyamide 6.6 ◽  
Experimental Researches

The present paper aims the theoretical study, using the finite element method, on the single point incremental forming process of two polymeric materials: polyamide 6.6 and high-density polyethylene. The experimental researches used for the determination of the true stress - true strain curves for two materials are presented, which are necessary for their introduction into the simulation. The explicit analysis is carried out with the Ls-Dyna program and the results of the analysis were focused on the major strain, minor strain, thickness reduction, forces on the process and total energy consumed in the process.

scholarly journals Comparative Study About Different Experimental Layouts Used on Single Point Incremental Forming Process

2018 ◽  
Vol 70 (1) ◽  
pp. 21-27
Author(s):  
Mihaela Oleksik
Keyword(s):  
Comparative Study ◽  
Incremental Forming ◽  
Single Point ◽  
Industrial Robots ◽  
Single Point Incremental Forming ◽  
Forming Process ◽  
Advantages And Disadvantages ◽  
Milling Machines ◽  
The Comparative Study ◽  
Technological Opportunities

Abstract The present paper proposes a comparative study between two of the most used experimental layouts on the single point incremental forming with the advantages and disadvantages of these experimental layouts. After a short presentation of the newest technological opportunities on single point incremental forming, the paper presents a classification of the experimental layouts used on this kind of forming process. The comparative study highlights the advantages and the disadvantages of using the universal milling machines and the industrial robots on single point incremental forming. There are presented the results focused on thinning and forces in the SPIF process.

New Methodologies for the Determination of Precise Forming Limit Curve in Single Point Incremental Forming Process

2010 ◽  
Vol 97-101 ◽  
pp. 126-129 ◽  
Author(s):  
Ghulam Hussain ◽  
Gao Lin ◽  
Nasir Hayat ◽  
Nameem Ullah Dar ◽  
Asif Iqbal
Keyword(s):  
Incremental Forming ◽  
Single Point ◽  
Forming Limit ◽  
Single Point Incremental Forming ◽  
Limit Curve ◽  
Forming Process ◽  
Forming Limit Curve ◽  
Groove Test ◽  
New Methodologies

Straight groove test is a widely-used formability test in Single Point Incremental Forming (SPIF). This test does not cover all the forming aspects of SPIF process, however. In order to ascertain its legitimacy, two new tests covering necessary SPIF aspects are devised. The FLC of an aluminum sheet is determined using the newly proposed and straight groove tests. It is found that the straight groove test shows much lower formability than the new tests. Therefore, the employment of newly devised test(s) is proposed for the determination of precise formability limits.

scholarly journals Numerical Study about the Influence of Wall Angle about Main Strains, Thickness Reduction and Forces on Single Point Incremental Forming Process

2016 ◽  
Vol 68 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Valentin Oleksik
Keyword(s):  
Incremental Forming ◽  
Numerical Study ◽  
Single Point ◽  
Testing Machine ◽  
Thickness Reduction ◽  
Single Point Incremental Forming ◽  
Forming Process ◽  
Wall Angle ◽  
Traction Test ◽  
Explicit Dynamic

Abstract The current paper aims to study, using numerical simulation, the influence of the wall angle on the single point incremental forming process. For the analysis there has been used the LS-Dyna software and three explicit dynamic analyses were run for three parts with wall angles of 450, 550 and 650. The factors taken into account are the main strains, the thickness reduction and the forces on three directions. The material data introduced into the simulation were determined based on an uniaxial traction test on an Instron 5587 testing machine and the Aramis system was used as optical extensometer.

scholarly journals Numerical-Experimental Study Regarding the Single Point Incremental Forming Process

2021 ◽  
Vol 343 ◽  
pp. 03008
Author(s):  
Nicolae Rosca ◽  
Mihaela Oleksik ◽  
Liviu Rosca
Keyword(s):  
Experimental Research ◽  
Incremental Forming ◽  
Single Point ◽  
Shell Element ◽  
Adaptive Mesh ◽  
Single Point Incremental Forming ◽  
The Finite Element Method ◽  
Forming Process ◽  
Fully Integrated ◽  
Spiral Trajectory

The present paper proposes a numerical-experimental comparative study on the single point incremental forming process. A DC04 steel sheet with a thickness of 0.6 mm was used for both the numerical simulation using the finite element method and the experimental research. The type of trajectory used was a spiral trajectory and the finished part obtained was a truncated cone-shaped part. The analysis program used for simulation was Ls-Dyna. The simulations were performed in several variants: with a fixed mesh and with an adaptive mesh, using two different element formulations: 25 (Belytschko-Tsay formulation with thickness stretch) and -16 (fully integrated shell element modified for higher accuracy) and two contact types: automatic surface to surface (ASTS) and forming one way surface to surface (FOSS). The results of the numerical analysis and of the experimental research were focused on determining the major strain, minor strain, thickness reduction and forces at the end of the single point incremental forming process, as well as determining the processing time.

Geometry Compensation Methods for Increasing the Accuracy of the SPIF Process

2021 ◽  
Vol 883 ◽  
pp. 217-224
Author(s):  
Yannick Carette ◽  
Marthe Vanhulst ◽  
Joost R. Duflou
Keyword(s):  
Control Strategy ◽  
Incremental Forming ◽  
Single Point ◽  
Single Point Incremental Forming ◽  
Calculation Methods ◽  
Forming Process ◽  
Complex Deformation ◽  
Commercial Use ◽  
Compensation Methods ◽  
Deformation Mechanics

Despite years of supporting research, commercial use of the Single Point Incremental Forming process remains very limited. The promised flexibility and lack of specific tooling is contradicted by its highly complex deformation mechanics, resulting in a process that is easy to implement but where workpiece accuracy is very difficult to control. This paper looks at geometry compensation as a viable control strategy to increase the accuracy of produced workpieces. The input geometry of the process can be compensated using knowledge about the deformations occurring during production. The deviations between the nominal CAD geometry and the actual produced geometry can be calculated in a variety of different ways, thus directly influencing the compensation. Two different alignment methods and three deviation calculation methods are explained in detail. Six combined deviation calculation methods are used to generate compensated inputs, which are experimentally produced and compared to the uncompensated part. All different methods are able to noticeably improve the accuracy, with the production alignment and closest point deviation calculation achieving the best results

Experimental Investigation of Single Point Incremental Forming of Aluminum Sheet in Groove Test

2017 ◽  
Vol 867 ◽  
pp. 177-183 ◽  
Author(s):  
Vikrant Sharma ◽  
Ashish Gohil ◽  
Bharat Modi
Keyword(s):  
Experimental Investigation ◽  
Incremental Forming ◽  
Single Point ◽  
Fractional Factorial ◽  
Single Point Incremental Forming ◽  
Forming Process ◽  
Backing Plate ◽  
Groove Test ◽  
Factorial Design Of Experiments ◽  
Tool Diameter

Incremental sheet forming is one of the latest processes in sheet metal forming industry which has drawn attention of various researchers. It has shown improved formability compared to stamping process. Single Point Incremental Forming (SPIF) process requires only hemispherical tool and no die is required hence, it is a die-less forming process. In this paper experimental investigation on SPIF for Aluminium sheet has been presented. A groove test on Vertical Machining Centre has been performed. Factors (Step depth, Blank holder clamping area, Backing plate radius, Program strategy, Feed rate and Tool diameter) affecting the process are identified and experiments are carried out using fractional factorial design of experiments. Effect of the factors on fractured depth, forming time and surface finish have been analyzed using Minitab 17 software.

Determination of Technological Forces in the Incremental Forming Process

2013 ◽  
Vol 371 ◽  
pp. 133-137
Author(s):  
Radu Eugen Breaz ◽  
Melania Tera ◽  
Octavian Bologa ◽  
Sever Gabriel Racz
Keyword(s):  
Image Processing ◽  
Theoretical Model ◽  
Data Acquisition ◽  
Incremental Forming ◽  
Single Point ◽  
Cnc Milling ◽  
Forming Process ◽  
Feed Drive ◽  
Cnc Milling Machine

The paper presents a joint theoretical and experimental approach to determine the technological forces within the asymmetric single point incremental forming ASPIF process, based upon a theoretical model, image processing and data acquisition. The first step of this approach was to develop a theoretical model of the forces within the process, based upon the model of a mechanical feed drive of a CNC milling machine. By means of this model, relationships between the resistant torque at the motor spindle level and the technological force on the movement axis could be determined. Using an image processing method, which allowed the user to extract information within the machines operator panel and analytical relationships, the technological forces were determined. The results were compared with the measured values, obtained by means of a data acquisition system.

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