External force-assisted LaserOrigami (LO) bending: Shaping of 3D cubes and edge design of stainless steel chairs

Gisario, Annamaria; Barletta, Massimiliano; Venettacci, Simone; Veniali, F.

doi:10.1016/j.jmapro.2015.03.006

Cited by 14 publications

(4 citation statements)

References 21 publications

(25 reference statements)

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“…The following steps are involved during external force laser-assisted bending process of the titanium alloys: (1) cleaning of the substrates in an ultrasonic bath of a solution of isopropyl alcohol; (2) workpiece positioning on the bending device and its clamping inside the dowels of the system; (3) positioning of the punch below the bending line (i.e., the laser scanning pattern); (4) triggering the compressed air system with a constant pressure of 8 bar; (5) setting of laser working distance on the substrate surface; (6) setting the operational parameters of laser processing; (7) checking alignment between clamping system and laser beam; (8) starting the experimental apparatus and data recording; (9) starting the processing of the substrate; (10) turning off the laser system and the compressed air system; (11) cooling off the experimental apparatus and retrieving the workpiece; (12) measuring the bending parameters. The operational parameters of the experiment (laser power, scan speed and number of passes) are summarized in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…These hybrid techniques are therefore reliable alternatives to conventional shaping process, which prevent expensive moulds, massive presses and big loads to be involved in the process [10]. As earlier mentioned, springback is the other main drawback in bending process which is always hard to control, since it might impair the final shape of workpiece due to lack of appropriate control [11][12]. Managing of springback is known to be extremely troublesome since it depends on multiple concurrent variables such as the material properties of workpiece (especially, yield strength, elastic modulus and hardening coefficient), interaction between mould and workpiece (especially, frictions) and design of the loading device [13].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Laser-assisted bending of Titanium Grade-2 sheets: Experimental analysis and numerical simulation

Gisario

Mehrpouya

Venettacci

et al. 2017

Optics and Lasers in Engineering

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser-assisted bending of Titanium Grade-2 sheets: Experimental analysis and numerical simulation

Gisario

Mehrpouya

Venettacci

et al. 2017

Optics and Lasers in Engineering

Self Cite

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“…Laser bending of a low carbon steel tube has been experimentally investigated and simulated through an ABAQUS three-dimensional model by Li and Yao [8]. Gisarioa et al [9] experimentally analysed and simulated (using ABAQUS Explicit 6.12) the laser shaping 3D metal objects process, and studied the forming of 3D objects by bending of flat metal through the external force-assisted laser origami [10].…”

Section: Introductionmentioning

confidence: 99%

An Autonomous Laser Kirigami Method With Low-Cost Real-Time Vision-Based Surface Deformation Feedback System

Wang

et al. 2021

Preprint

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We introduce an autonomous laser kirigami technique, a novel custom manufacturing machine system which functions somewhat similar to a photocopier. This technique is capable of creating functional freeform shell structures using cutting and folding (kirigami) operations on sheet precursors. Conventional laser kirigami techniques are operated manually and rely heavily on precise calibrations. However, it is unrealistic to design and plan out the process (open loop) to realize arbitrary geometric features from a wide variety of materials. In our work, we develop and demonstrate a completely autonomous system, which is composed of a laser system, a 4-axis robotic arm, a real-time vision-based surface deformation monitoring system, and an associated control system. The laser system is based on the Lasersaur, which is a 120-Watt CO2 open source laser cutter. The robotic arm is employed to precisely adjust the distance between a workpiece and the laser lens so that a focused and defocused laser beam can be used to cut and fold the workpiece respectively. The four-axis robotic arm provides flexibility for expanding the limits of possible shapes, compared to conventional laser machine setups where the workpiece is fixed on rigid holders. The real-time vision-based surface deformation monitoring system is composed of four low-cost cameras, an integrated AI-assisted algorithm, and the sensors (detachable planar markers) mounted on the polymer-based sheet precursors, and allows real-time monitoring of the sheet forming process and geometric evolution with a geometric feature estimation error less than 5 % and delay time around 100ms. The developed control system manages the laser power, the laser scanning speed, the motion of the robotic arm based on the designed plan as well as the close-loop feedback provided by the vision-based surface deformation monitoring system. This cyber-physical kirigami platform can operate a sequence of cutting and folding processes in order to create kirigami objects. Hence, complicated kirigami design products with various different polygonal structures can be realized by undergoing sequential designed laser cuts, and bends (at any folding angles within designed geometric tolerance) using this autonomous kirigami platform.

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“…Gisario et al (2015a) studied laser assisted bending of AISI 304 stainless steel sheets of 1 mm thickness to obtain a large bend angle upto 140°with a small fillet radius of 2 mm. Gisario et al (2015b) studied laser assisted origami bending of the stainless steel sheets for shaping the sheets into three dimensional items such as cubes and chairs. They found that the manufactured items have good precision, accuracy and aesthetic appearance.…”

Section: Introductionmentioning

confidence: 99%

An integrated FEM-ANN model for laser bending process with inverse estimation of absorptivity

Kant

Joshi

Dixit

2015

Mech Adv Mater Mod Process

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Background: Absorption of laser energy into the worksheet surface during laser bending process is an important and critical factor for accurate computation of the bend angle. This paper presents an integrated FEM-ANN approach to compute accurate value of bend angle during laser bending process. Methods: Initially, a finite element method (FEM) based three-dimensional nonlinear transient thermo-mechanical numerical model is developed using ABAQUS package. Using FEM model and data obtained in actual experiments, the proper values of absorptivity for various sets of process conditions are computed by inverse analysis technique. Based on the proper values of absorptivity, an artificial neural network (ANN) model is developed for accurate and quick prediction of absorptivity for given input process conditions. The predicted absorptivity is then employed in the FEM model for accurate computation of bend angle. Results: The performance of the integrated approach is verified by conducting experiments.

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External force-assisted LaserOrigami (LO) bending: Shaping of 3D cubes and edge design of stainless steel chairs

Cited by 14 publications

References 21 publications

Laser-assisted bending of Titanium Grade-2 sheets: Experimental analysis and numerical simulation

Laser-assisted bending of Titanium Grade-2 sheets: Experimental analysis and numerical simulation

An Autonomous Laser Kirigami Method With Low-Cost Real-Time Vision-Based Surface Deformation Feedback System

An integrated FEM-ANN model for laser bending process with inverse estimation of absorptivity

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