Optical study for springback prediction, thickness reduction and forces variations on single point incremental forming

2019 ◽  
Vol 12 ◽  
pp. 213-218
Author(s):  
Nicolae Rosca ◽  
Valentin Oleksik ◽  
Adrian Pascu ◽  
Mihaela Oleksik ◽  
Eugen Avrigean
Keyword(s):  
Incremental Forming ◽  
Single Point ◽  
Thickness Reduction ◽  
Single Point Incremental Forming ◽  
Optical Study ◽  
Springback Prediction

Theoretical and Experimental Studies on the Influence of Process Parameters on Strains and Forces of Single Point Incremental Forming

2014 ◽  
Vol 939 ◽  
pp. 367-372
Author(s):  
Valentin Oleksik ◽  
Adrian Pascu ◽  
Eugen Avrigean ◽  
Ioan Bondrea
Keyword(s):  
Incremental Forming ◽  
Single Point ◽  
Experimental Studies ◽  
Thickness Reduction ◽  
Experimental Program ◽  
Geometrical Parameters ◽  
Single Point Incremental Forming ◽  
Influence Of Process Parameters ◽  
Linear Trajectory ◽  
Vertical Step

These paper aims to determine the influence of the most important geometrical parameters (vertical step and punch diameter) on the main strains, thickness reduction and the forces along two directions during the single point incremental forming process (SPIF). The paper comprises a comparative numericalexperimental study, for a simple geometry part obtained by incremental forming. In fact, in the first stage, the punch has a vertical motion with the value of one vertical step. In the second stage, the punch follows a linear trajectory along one side of the die. After each linear trajectory the punch has successive vertical motions, taking one vertical step at a time until the entire geometry of the part is done. In order to study the influence of the geometrical parameters, to the vertical step and the punch diameter were assigned three levels of variation. Following the selection of these geometrical parameters values, a factorial experimental program of type 32 has been adopted. The maximum values of the main strain and thickness reduction rises with the decrease of both vertical step and punch diameter and the maximum values of the forces are reached with the increase of both vertical step and punch diameter.

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 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 A Study on the Influence of the Forming Strategy on the Main Strains, Thickness Reduction, and Forces in a Single Point Incremental Forming Process

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Adrian Blaga ◽  
Valentin Oleksik
Keyword(s):  
Complex Geometry ◽  
Incremental Forming ◽  
Single Point ◽  
Thickness Reduction ◽  
Circular Path ◽  
Single Point Incremental Forming ◽  
Cnc Milling ◽  
Forming Process ◽  
Truncated Cone ◽  
Forming Strategy

This paper comprises an experimental study for a complex geometry part obtained by incremental forming. Due to the process complexity (the presence of forces on three directions—a vertical one and two in the blank's plane), a three axes CNC milling machine, capable of describing the complex paths covered by the punch for obtaining the truncated cone-shaped parts, has been chosen. To obtain a truncated cone, three different trajectories were selected: in first and second variants after each vertical press having a constant step, the punch covers a circular path. The differences show that the following circular trajectory can start at the same point or can be shifted at an angle of 90° from the previous press point. In the last variant, the punch performs a spatial spiral trajectory. The main objective of our study was to determine the optimal forming strategy, by shifting the press position of the punch and the path it follows to obtain a truncated cone through single point incremental forming. Thus, the strain distribution can be homogeneous, and the thickness reduction and the process forces are minimal.

scholarly journals Experimental Study Regarding PA and PE Sheets on Single Point Incremental Forming Process

2021 ◽  
Vol 343 ◽  
pp. 03009
Author(s):  
Nicolae Rosca ◽  
Mihaela Oleksik ◽  
Valentin Oleksik
Keyword(s):  
Experimental Study ◽  
Incremental Forming ◽  
Single Point ◽  
Correlation Method ◽  
Image Correlation ◽  
Thickness Reduction ◽  
Single Point Incremental Forming ◽  
Minor Strain ◽  
Forming Process ◽  
Incremental Process

The present paper aims to present an experimental study on the behaviour of PA and PE sheets during the single point incremental forming. Due to the fact that the purpose of this research is to study the behaviour of PA and PE sheets during the single point incremental process both in terms of process forces and in terms of major and minor strain and thickness reduction, a Kuka Kr210 robot was chosen as an alternative to using a universal milling machine. The specimens were made of 3 mm PA and PE sheets. The size of the sheets was 250 mm x 250 mm. The forces measured on the three directions of the coordinate axes were compared. To measure the major strain, minor strain and thickness reduction, the digital image correlation method was applied.

Improve the Micro-hardness of Single Point Incremental Forming Product Using Magnetic Abrasive Finishing

2020 ◽  
Vol 38 (8A) ◽  
pp. 1137-1142
Author(s):  
Baqer A. Ahmed ◽  
Saad K. Shather ◽  
Wisam K. Hamdan
Keyword(s):  
Vickers Hardness ◽  
Feed Rate ◽  
Incremental Forming ◽  
Single Point ◽  
Single Point Incremental Forming ◽  
Step Size ◽  
Coil Current ◽  
Magnetic Abrasive Finishing ◽  
Finishing Process ◽  
Abrasive Finishing

In this paper the Magnetic Abrasive Finishing (MAF) was utilized after Single Point Incremental Forming (SPIF) process as a combined finishing process. Firstly, the Single Point Incremental forming was form the truncated cone made from low carbon steel (1008-AISI) based on Z-level tool path then the magnetic abrasive finishing process was applied on the surface of the formed product. Box-Behnken design of experiment in Minitab 17 software was used in this study. The influences of different parameters (feed rate, machining step size, coil current and spindle speed) on change in Micro-Vickers hardness were studied. The maximum and minimum change in Micro-Vickers hardness that achieved from all the experiments were (40.4 and 1.1) respectively. The contribution percent of (feed rate, machining step size, coil current and spindle speed) were (7.1, 18.068, 17.376 and 37.894) % respectively. After MAF process all the micro surface cracks that generated on the workpiece surface was completely removed from the surface.

Multiobjective optimization of process variables in single-point incremental forming using grey relational analysis coupled with entropy weights

2021 ◽  
pp. 146442072110204
Author(s):  
Abdulmajeed Dabwan ◽  
Adham E Ragab ◽  
Mohamed A Saleh ◽  
Atef M Ghaleb ◽  
Mohamed Z Ramadan ◽  
...  
Keyword(s):  
Grey Relational Analysis ◽  
Incremental Forming ◽  
Single Point ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Numerical Control ◽  
Single Point Incremental Forming ◽  
Process Variables ◽  
Relational Analysis ◽  
Grey Relational

Incremental sheet forming is a specific group of sheet forming methods that enable the manufacture of complex parts utilizing computer numerical control instead of specialized tools. It is an incredibly adaptable operation that involves minimal usage of sophisticated tools, dies, and forming presses. Besides its main application in the field of rapid prototyping, incremental sheet forming processes can be used for the manufacture of unique parts in small batches. The goal of this study is to broaden the knowledge of the deformation process in single-point incremental forming. This work studies the deformation behavior in single-point incremental forming by experimentally investigating the principal stresses, principal strains, and thinning of single-point incremental forming products. Conical-shaped components are fabricated using AA1050-H14 aluminum alloy at various combinations of fundamental variables. The factorial design is employed to plan the experimental study and analysis of variance is conducted to analyze the results. The grey relational analysis approach coupled with entropy weights is also implemented to identify optimum process variables for single-point incremental forming. The results show that the tool diameter has the greatest effect on the thinning of the SPIF product, followed by the sheet thickness, step size, and feed rate.

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