Laser-assisted robotic roller forming of an ultrahigh strength martensitic steel

Liu, Yi; Min, Junying; Zhang, Jun; Cai, Wayne; Carlson, Blair E.; Bobel, Andrew; Hector, Louis G.; Sachdev, Anil K.

doi:10.1016/j.jmapro.2022.07.066

Cited by 10 publications

(7 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, partial austenitization occurs on the metal sheet at temperatures above 874 °C, according to JMatPro. Austenite should then transform into fresh martensite again due to the subsequent fast cooling [ 4 ], and the critical martensitic transformation temperature (M s ) was estimated to be 339 °C according to JMatPro. It is interesting to find that the peak temperatures exceeded the austenitization temperature while forming temperatures were always above the M s temperature when forming at a laser power density of more than 7.5 J/mm 2 , suggesting the existence of austenite during forming, and this is likely also one of the major factors that decrease the bending forces.…”

Section: Discussionmentioning

confidence: 99%

“…QP1180 steel sheets were cut into 250 mm × 60 mm strips by laser cutting; afterwards, the strips were clamped onto the fixture and ready for the subsequent forming procedure. An LRRF process was applied to bend the strips into nearly 90-degree L-shaped parts by multiple forming passes [ 4 , 20 ]. The schematic of LRRF and the corresponding experimental facilities can be found in Figure 1 .…”

Section: Methodsmentioning

confidence: 99%

“…In contrast to low-carbon steels, UHSS are characterized by 3–6 times higher yield strength, 3–5 times lower elongation, and thus 3–4 times larger R/t ratio [ 2 ]. Some one-step forming processes, for example, stamping and press-brake bending, lead to the inevitable formation of defects, such as significant springback [ 3 ] and even cracks [ 4 ]. Although multi-pass forming strategies like incremental forming and roller forming are feasible alternatives to avoid these shape defects to some extent through the cumulative plastic-deformation mechanism [ 5 ], the formation method of ultrahigh-strength components with small bending radii is still limited [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Laser-Assisted Robotic Roller Forming of Ultrahigh-Strength Steel QP1180 with High Precision

et al. 2023

Self Cite

View full text Add to dashboard Cite

Laser-assisted forming provides a perfect solution that overcomes the formability of low-ductility materials. In this study, laser-assisted robotic roller forming (LRRF) was applied to bend ultrahigh-strength steel sheet (a quenching and partitioning steel with a strength grade of 1180 MPa), and the effects of laser power density on the bending forces, springback, and bending radius of the final parts were investigated. The results show that LRRF is capable of reducing bending forces by 43%, and a compact profile with high precision (i.e., a springback angle smaller than 1° and a radius-to-thickness ratio of ~1.2) was finally achieved at a laser power density of 10 J/mm2. A higher forming temperature, at which a significant decrease in strength is observed, is responsible for the decrease of forming forces with a laser power density of higher than 7.5 J/mm2; another reason could be the heating-to-austenitization temperature and subsequent forming at a temperature above martensitic-transformation temperature. Forming takes place at a higher temperature with lower stresses, and unloading occurs at a relatively lower temperature with the recovery of Young’s modulus; both facilitate the reduction of springback angles. In addition, the sharp bending radius is considered to be attributed to localized deformation and large plastic strains at the heating area.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Laser-Assisted Robotic Roller Forming of Ultrahigh-Strength Steel QP1180 with High Precision

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…Based on the process capabilities of laser-assisted forming and robot-based manufacturing, one laserassisted robotic roller forming (LRRF) process has been proposed and applied to bending ultra-high strength steel sheets. With the introduction of synchronized laser heating and incremental roller forming, the generation of cracks in traditional cold forming can be prevented [12] and compact thin-walled structures with smaller springback and sharper bending radii can be achieved [13]. Prior investigations were mostly focused on the process capability [12] as well as the microstructure evolution during LRRF [16], while the process window for this process was not well understood.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on process parameters of laser-assisted robotic roller bending of a thin-walled structure

Qiu,

Xu,

Liu

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Laser-assisted robotic roller forming (LRRF) combines the process capabilities of robot-based manufacturing and laser-assisted forming. In this work, the LRRF process was applied to bending DP1180 steel sheets to thin-walled structures designed for seat trails. Comprehensive experimental investigations were conducted to explore the influences of laser power, forming passes and scanning speed on the forming forces, springback and bending radii of final parts. Experimental results show that the effects of process parameters on the springback and bending radii are similar to those on the forming forces, while forming passes make an insignificant difference to the springback. The optimized process window was subsequently determined out of the balance between geometrical accuracy and experimental efficiency. By applying the optimized process parameters (laser power of 750 W, 6 forming passes, scanning speed of 5 mm/s), the peak force during LRRF was reduced to ∼2.1kN. Meanwhile, a thin-walled profile with higher precision was achieved. Specifically, the springback angle was reduced to ∼4.1° and a compact profile with a radius-to-thickness ratio of ∼1.0 was obtained.

show abstract

“…He detailed the formability of sheet metals and presented various mathematical modelling techniques for forming limit predictions. Another important role of simulation is to quantitatively evaluate the influence of forming process parameters on the mechanical properties of formed parts through the calibrated simulation model to provide effective guidance for subsequent forming process optimization [ 67 , 68 , 69 ]. There have been numerous studies and reviews of SMF simulations, from fundamental plasticity theory to the optimization of FE models [ 31 , 70 , 71 , 72 ].…”

Section: Introductionmentioning

confidence: 99%

A Review of Characterization and Modelling Approaches for Sheet Metal Forming of Lightweight Metallic Materials

Hou

Myung

Park³

et al. 2023

Materials

Self Cite

View full text Add to dashboard Cite

Lightweight sheet metals are attractive for aerospace and automotive applications due to their exceptional properties, such as low density and high strength. Sheet metal forming (SMF) is a key technology to manufacturing lightweight thin-walled complex-shaped components. With the development of SMF, numerical simulation and theoretical modelling are promoted to enhance the performance of new SMF technologies. Thus, it is extraordinarily valuable to present a comprehensive review of historical development in SMF followed by state-of-the-art advanced characterization and modelling approaches for lightweight metallic materials. First, the importance of lightweight materials and their relationship with SMF followed by the historical development of SMF are reviewed. Then, the progress of advanced finite element technologies for simulating metal forming with lightweight alloys is covered. The constitutive modelling of lightweight alloys with an explanation of state-of-the-art advanced characterization to identify the constitutive parameters are presented. Then, the formability of sheet metals with major influencing factors, the techniques for measuring surface strains in SMF and the experimental and modelling approaches for determining the formability limits are clarified. Finally, the review is concluded by affording discussion of the present and future trends which may be used in SMF for lightweight metallic materials.

show abstract

Laser-assisted robotic roller forming of an ultrahigh strength martensitic steel

Cited by 10 publications

References 23 publications

Laser-Assisted Robotic Roller Forming of Ultrahigh-Strength Steel QP1180 with High Precision

Laser-Assisted Robotic Roller Forming of Ultrahigh-Strength Steel QP1180 with High Precision

Experimental investigation on process parameters of laser-assisted robotic roller bending of a thin-walled structure

A Review of Characterization and Modelling Approaches for Sheet Metal Forming of Lightweight Metallic Materials

Contact Info

Product

Resources

About