Experimental and numerical study of spiral scan paths on cap laser forming

Gollo, M. Hoseinpour; Nadi, Gholamreza; Mehdi, Mohammad; Abbaszadeh, M.

doi:10.2351/1.4900795

Cited by 14 publications

(2 citation statements)

References 21 publications

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“…A comparison of spiral path movement with a circular irradiation path shows that a smoother curvature will be obtained while using a spiral path strategy. Moreover, the radial circular path forms the workpiece according to the buckling mechanism (BM), whereas the spiral irradiation pattern will result in a gradient mechanism (GM) [85,86]. Different materials, including mild steel, AISI 316 stainless-steel sheet [87], Galvanized iron [88], and AISI 304 stainless steel [89], were successfully formed by the researchers.…”

Section: Doubly Curved Partsmentioning

confidence: 99%

Recent Advances in the Laser Forming Process: A Review

Safari

Sousa

Joudaki

2020

Metals

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Laser forming is an emerging manufacturing process capable of producing either uncomplicated and complicated shapes by employing a concentrated heating source. The heat source movement creates local softening, and a plastic strain will be induced during the rise of temperature and the subsequent cooling. This contactless forming process may be used for the simple bending of sheets and tubes or fabrication of doubly-curved parts. Different studies have been carried out over recent years to understand the mechanism of forming and predicting the bending angle. The analysis of process parameters and search for optimized manufacturing conditions are among the most discussed topics. This review describes the main recent findings in the laser forming of single and multilayer sheets, composite and fiber-metal laminate plates, force assisted laser bending, tube bending by laser beam, the optimization technique implemented for process parameters selection and control, doubly-curved parts, and the analytical solutions in laser bending. The main focus is set to the researches published since 2015.

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Section: Doubly Curved Partsmentioning

confidence: 99%

Recent Advances in the Laser Forming Process: A Review

Safari

Sousa

Joudaki

2020

Metals

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“…The results showed that by selection tailored laser scan patterns and suitable setting of the parameters, tridimensional shapes were formed by high-power diode laser. Hoseinpour Gollo et al 28 investigated the influence of spiral scan paths to create cap by laser forming experimentally and numerically. Laser forming of metal foam was investigated by Roohi et al 29 They studied the influences of three geometrical parameters on bending angle and concluded that relative density of the foam and the mean cell size had the most and the least influences on the final bending angle, respectively.…”

Section: Introductionmentioning

confidence: 99%

Through-depth residual stress measurement of laser bent steel–titanium bimetal sheets

Kotobi

Honarpisheh

2018

The Journal of Strain Analysis for Engineering Design

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Laser bending is one of the thermal forming processes which in each pass of it, the temperature of sample increases at heat-affected zone during irradiation time considerably and then it cools to near ambient temperature after passing the laser beam. Consequently, it can be predicted that the process can induce significant residual stress in the sample. In this article, laser bending process of the explosive welded steel-titanium bimetal sample was done and the through-thickness residual stress profile of it was investigated by the slitting method experimentally. The pulse-regularization approach was used to calculate the residual stress in the bimetal sample. Also, simulation of the laser bending process was performed and the numerical residual stress profile was compared with the experimental one. Furthermore, the effects of process parameters including laser power, scanning velocity and number of scanning passes on the bending angle of bimetal samples were investigated experimentally. Besides, the effect of laser bending process on the surface microhardness was studied. The results demonstrated that the laser bending process can create significant residual stress at the heataffected zone of specimen. In the residual stress profile of bimetal sample, a discontinuity was seen at the interface of the materials, as was expected. There was a good agreement between experimental and numerical results. The maximum compressive and tensile residual stresses raised by increase laser power and number of scanning passes. Both of them reduced by magnifying scanning velocity. The laser bending process can increase the surface microhardness at the heat-affected zone which can be attributed to the reduction of grain size at the heat-affected zone.

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